USER'S GUIDE Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series DMT340 M210704EN-G
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www.vaisala.com. © Vaisala 2013 No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION .......................................................................... 11 About This Manual ................................................................. 11 Contents of This Manual ..................................................... 11 Version Information ............................................................. 12 Documentation Conventions .......................
User's Guide _______________________________________________________________________ DMT348 For Pressurized Pipelines ..................................... 41 Tightening the Clasp Nut ..................................................... 42 Ball Valve Installation Kit for DMT348 ................................. 44 Leak Screw Installation........................................................ 46 Mounting the Probe Directly to the Process ........................ 47 Sampling Cell for DMT348 ................
_________________________________________________________________________________ Wireless LAN Configuration ................................................ 89 Using Display/Keypad .................................................... 90 Using Serial Line ............................................................ 91 Communication Protocol ..................................................... 92 Web Configuration for LAN and WLAN ............................... 92 Terminal Program Settings ................
User's Guide _______________________________________________________________________ Selecting the Data Recording Quantities .......................... 119 DSEL ............................................................................ 119 View Recorded Data.......................................................... 120 DIR ............................................................................... 120 PLAY ............................................................................
_________________________________________________________________________________ CHAPTER 6 MAINTENANCE ......................................................................................... 149 Periodic Maintenance .......................................................... 149 Cleaning ............................................................................ 149 Changing the Probe Filter ................................................. 149 Calibration and Adjustment ................................
User's Guide _______________________________________________________________________ APPENDIX A CALCULATION FORMULAS ..................................................................... 177 APPENDIX B MODBUS REFERENCE ............................................................................. 181 Function Codes..................................................................... 181 Register Map ......................................................................... 182 Data Encoding ................
_________________________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Fi
User's Guide _______________________________________________________________________ Figure 55 Figure 56 Figure 57 Figure 58 Figure 59 Figure 60 Figure 61 Figure 62 Figure 63 Figure 64 Figure 65 Figure 66 Figure 67 Figure 68 Figure 69 Figure 70 Figure 71 Figure 72 Figure 73 Figure 74 Figure 75 Figure 76 Figure 77 Figure 78 Figure 79 Figure 80 Figure 81 Figure 82 Figure 83 Figure 84 Figure 85 Figure 86 Figure 87 Figure 88 Figure 89 Figure 90 Figure 91 Figure 92 Figure 93 Figure 94 Figure 95 Figure 96 Figure
_________________________________________________________________________________ List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Table 25 Table 26 Table 27 Table 28 Table 29 Table 30 Table 31 Table 32 Table 33 Table 34 Table 35 Table 36 Table 37 Table 38 Table 39 Table 40 Table 41 Table 42 Table 43 Table 44 Table 45 Manual Revisions
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Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION About This Manual This manual provides information for installing, operating, and maintaining Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series DMT340. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the product.
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Revisions Manual Code M210704EN-G M210704EN-F Description December 2013. This manual. Added new command descriptions: ALSEL, AOVER, CON, DSEND, and MODS. Updated FILT command description. Updated technical specification. Various small corrections. Previous version. Applicable from transmitter software version 5.10 onward. Added Modbus protocol.
Chapter 1 _________________________________________________________ General Information Safety The DMT340 Dewpoint and Temperature Transmitter delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product, and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit.
User's Guide _______________________________________________________________________ Regulatory Compliances EU Declaration of Conformity Vaisala DRYCAP® Humidity and Temperature Transmitter Series DMT340 is in conformity with the provisions of the following EU directives: - Low Voltage Directive - EMC-Directive Conformity is shown by compliance with the following standards: - EN 60950-1 - EN 61326-1: Electrical equipment for measurement, control, and laboratory use – EMC requirements – for use in industria
Chapter 1 _________________________________________________________ General Information Transmitters with WLAN Interface This device has been designed to operate with a 2 dBi half-wave antenna. Antennas with a gain greater than 2 dBi are prohibited for use with this device. The antenna impedance is 50 ohms.
User's Guide _______________________________________________________________________ Warranty Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty. Please observe that any such warranty may not be valid in case of damage due to normal wear and tear, exceptional operating conditions, negligent handling or installation, or unauthorized modifications. Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature of the Vaisala DRYCAP® Dewpoint and Temperature Transmitter DMT340 Series. Introduction to DMT340 The DMT340 transmitter measures dewpoint temperature accurately in a measurement range from -60ºC to +80 ºC (-76 ... +176 ºF). The AutoCal feature provides excellent long term stability of the measurement.
User's Guide _______________________________________________________________________ Table 2 Quantities and Their Abbreviations Quantity Abbreviation Metric Unit Dewpoint/frost point temperature (Td/f ) Mixing ratio (x) Parts per million TDF ºC Non-Metric Unit ºF X H2O g/kg ppmv/ ppmw gr/lb ppmv/ ppmw Table 3 Quantity Optional Quantities and Their Abbreviations Abbreviation Metric Unit Non-Metric Unit RH %RH %RH T ºC ºF TDFA ºC atm ºF atm Relative humidity RH Temperature T Dewpoint/frost point
Chapter 2 ___________________________________________________________ Product Overview Basic Features and Options - Dewpoint measurement with AutoCal and sensor purge features Sensor warming in high humidities Two analog outputs and a serial interface Several probes for different applications User friendly display and keypad interface (optional) Calculated output quantities available Different probe mounting kits, sensor protection options and probe cable lengths - Support for Modbus serial communications
User's Guide _______________________________________________________________________ Structure of the Transmitter 1104-001 Figure 1 Transmitter Body The numbers refer to Figure 1 above: 1 2 3 4 5 6 = = = = = = Signal + powering cable gland Cable gland for optional module, or WLAN antenna connector Cable gland for optional module or AC mains cable Cover screw (4 pcs) Display with keypad (optional) Cover LED 20 ___________________________________________________________________ M210704EN-G
Chapter 2 ___________________________________________________________ Product Overview 0604-006 Figure 2 Inside the Transmitter The numbers refer to Figure 2 above: 1 2 3 4 = = = = 5 6 7 8 9 10 = = = = = = Service port (RS-232) Dip switches for analog output settings Power supply and signal wiring screw terminals Relay, data logger, RS-422/485, LAN, or WLAN module (optional) Grounding connector Power supply module (optional) Relay, data logger, or analog output module (optional) Dewpoint probe Galva
User's Guide _______________________________________________________________________ Probe Options DMT342 small-size flanged probe for use with sampling cell DMT344 for high pressure applications DMT347 probe with Swagelok connector DMT348 for pressurized pipelines 0503-019 Figure 3 Probe Options For probe cable lengths, see Table 34 on page 167.
Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION Mounting the Housing The housing can be mounted either without the mounting plate or with optional mounting plates. Standard Mounting without Mounting Plate Mount the housing without the mounting plate by fastening the transmitter to the wall with 4 screws, for example, M6 (not provided).
User's Guide _______________________________________________________________________ Wall Mounting with Wall Mounting Kit When mounting with wall mounting kit the mounting plate (Vaisala order code 214829) can be installed directly on wall or onto a standard wall box (also US junction box). When wiring through back wall, remove the plastic plug from the wiring hole in the transmitter before mounting.
Chapter 3 ________________________________________________________________ Installation 0503-041 Figure 7 Mounting with Metal Wall Mounting Plate The numbers refer to Figure 7 above: 1 2 = = 3 = Mount the plate to wall with 4 screws M8 (not provided) Fasten DMT340 to the mounting plate with 4 fixing screws M6 (provided) Note the position of the arrow when mounting. This side must be up when mounting.
User's Guide _______________________________________________________________________ Mounting with DIN Rail Installation Kit DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and 2 screws M4 x 10 DIN 7985 (Vaisala order code 215094). 1. 2. 3. Attach two spring holders to the plastic mounting plate by using the screws provided in the installation kit. Fasten DMT340 to the plastic mounting plate with 4 screws (provided).
Chapter 3 ________________________________________________________________ Installation Pole Installation with Installation Kit for Pole or Pipeline Installation kit for pole or pipeline (Vaisala order code: 215108) includes the metal mounting plate and 4 mounting nuts for pole mounting. When mounting, the arrow in the metal mounting plate must point upward, see Figure 7 on page 25.
User's Guide _______________________________________________________________________ Mounting the Rain Shield with Installation Kit The rain shield is highly recommended for outdoor installations, especially for transmitters with the display/keypad option.
Chapter 3 ________________________________________________________________ Installation 4. Remove the paper protecting the adhesive tape on the frame, and attach the frame around the transmitter. Refer to Figure 13 below.
User's Guide _______________________________________________________________________ Wiring Cable Bushings A single electrical cable with a screen and three to ten wires is recommended for power and analog/serial connections. The cable diameter should be 8 ... 11 mm. The number of cable bushings depends on the transmitter options.
Chapter 3 ________________________________________________________________ Installation Grounding the Cables Ground the screen of the electrical cable properly to achieve the best possible EMC performance. 0605-027 Figure 16 Grounding the Screen of Electrical Cable Refer to Figure 16 above when performing the procedure below. 1. 2. 3. 4. 5. 6. 7. 8. Cut back outer sheath to desired length. Cut back screen braiding or screen foil to dimension X.
User's Guide _______________________________________________________________________ Transmitter Housing Grounding In case you need to ground the transmitter housing, the grounding connector is found inside the housing; see Figure 1 on page 20. Note anyhow that the probe is connected to the same potential as the housing. Make sure that different groundings are made to the same potential. Otherwise harmful ground currents may be generated.
Chapter 3 ________________________________________________________________ Installation 1. 2. 3. 4. 5. 6. 7. Open the transmitter cover by taking out the four cover screws. Insert the power supply wires and signal wires through the cable bushing in the bottom of the transmitter; see the grounding instructions in the previous sections. Connect the analog output cables to terminals: Ch1 +, Ch1-, Ch2+, Ch2-. Connect the RS-232 user port cables to terminals RxD, GND and TxD.
User's Guide _______________________________________________________________________ Connections to a 24 VAC Power Supply Separate floating supply for each transmitter is recommended (see the upper part of Figure 18 on page 34). If you have to connect several transmitters or other instruments to one AC supply, the phase (~) must always be connected to the (+) connector of each transmitter (see the lower part of Figure 18).
Chapter 3 ________________________________________________________________ Installation Probe Mounting NOTE NOTE Some probe and filter combinations are equipped with a washer under the filter. When mounting a probe inside a sampling cell, you may have to remove the washer to make the probe fit. When measuring temperature dependent quantities make sure that the temperature at the measurement point is equal to that of the process, otherwise the moisture reading may be incorrect.
User's Guide _______________________________________________________________________ 0503-017 Figure 20 HMP302SC Optional Sampling Cell The numbers refer to Figure 20 above: 1 2 3 4 5 6 CAUTION NOTE = = = = = = Gas in Probe Gas out Probe Sampling cell Clamp (not needed if sampling cell is supported on the piping) In pressurized processes it is essential to tighten the supporting nuts and screws very carefully to prevent loosening of the probe by the action of pressure.
Chapter 3 ________________________________________________________________ Installation DMT344 For High-pressure Applications The DMT344 probe is for the dewpoint measurements in pressurized rooms and industrial processes. The probe is provided with a nut, a fitting screw and a sealing washer. Keep the fitting screw and the nut in place on the body of the probe during handling to prevent damage to the highly polished surface of the probe. Follow the instructions below to achieve a leak-tight assembly: 1.
User's Guide _______________________________________________________________________ NOTE When re-tightening the nut after detachment the nut must be tightened without increased effort. 6. Clean and grease the tightening cone of the fitting screw after every tenth detachment. Change the sealing washer every time the fitting screw is detached. Use high-vacuum grease (for example Dow Corning) or a similar grease.
Chapter 3 ________________________________________________________________ Installation DMT347 Small Pressure-tight Probe The DMT347 is ideal for tight spaces with threaded connection. The small probe is installed using the threaded fitting bodies, see below.
User's Guide _______________________________________________________________________ 1. Preparing Installation. The connector options are the following: a. R3/8" ISO (Swagelok code SS-12M0-1-6RTBT) b. 1/2" NPT (Swagelok code SS-12M0-1-8BT) c. 1/2" ISO (Swagelok code SS-12M0-1-8RPBT) Note that the connector inner diameters extend for Ø12 mm probe. 2. 3. Probe position. Before the final tightening check that the upper edge of the connector nut is in line with the upper edge of the probe.
Chapter 3 ________________________________________________________________ Installation DMT348 For Pressurized Pipelines Due to the sliding fit the DMT348 is easy to install into and remove from the pressurized process. The probe is especially suitable for the measurements in pipelines. See section Ball Valve Installation Kit for DMT348 on page 44.
User's Guide _______________________________________________________________________ Table 4 Probe type Standard Optional DMT348 Probe Dimensions Probe Dimension 178 mm 400 mm Adjustment Range 120 mm 340 mm 0506-031 Figure 28 Sealing of Fitting Body into Process Tightening the Clasp Nut 1. 2. 3. 4. Adjust the probe to a suitable depth according to the type of installation. Tighten the clasp nut first manually. Mark the fitting screw and the clasp nut. Tighten the nut a further 50 … 60º (ca.
Chapter 3 ________________________________________________________________ Installation 0505-276 Figure 29 Tightening the Clasp Nut The numbers refer to Figure 29 above: 1 2 3 4 = = = = Probe Clasp nut Fitting screw Pen CAUTION Take care not to damage the probe body. A damaged body makes the probe less tight and may prevent it from going through the clasp nut.
User's Guide _______________________________________________________________________ Ball Valve Installation Kit for DMT348 The ball valve installation kit (Vaisala order code: BALLVALVE-1) is preferred when connecting the probe to a pressurized process or pipeline. Use the ball valve set or a 1/2" ball valve assembly with a ball hole of ø14 mm or more. If you install the probe (ø12 mm) in a process pipe, please note that the nominal size of the pipe must be at least 1 inch (2.54 cm).
Chapter 3 ________________________________________________________________ Installation NOTE The probe can be installed in the process through the ball valve assembly provided that the process pressure is less than 10 bars. This way, the process does not have to be shut down when installing or removing the probe. However, if the process is shut down before removing the probe, the process pressure can be max. 20 bars.
User's Guide _______________________________________________________________________ Leak Screw Installation When the probe cannot be installed directly in the pressurized process or process pipe, a leak screw installation can be used. In this installation method, you must install the DMT348 probe using a fitting body with leak screw, see Figure 27 on page 41.
Chapter 3 ________________________________________________________________ Installation Mounting the Probe Directly to the Process Select a point, which gives a true picture of the process. The transmitter can be installed directly in the process wall, especially if the pressure of the process is 1 bar (atmospheric processes). It may be necessary to use the sampling cell if the process (for example a pipe) is too small for the DMT348 probe.
User's Guide _______________________________________________________________________ When the probe is installed directly on the process wall or pipe, note that a closing valve may be needed on both sides of the installed probe so that the probe can be removed from the process for calibration or maintenance. If the probe is installed in a pressurized chamber, always make sure that the pressure of the chamber is equalized with the ambient pressure prior to removing the probe.
Chapter 3 ________________________________________________________________ Installation Sampling Cell for DMT348 It may be necessary to use a sampling cell if the process (for example a pipe) is too small for the DMT348 probe. Furthermore, if the process is very hot (>80 °C) or particularly dirty, the probe is installed in a sampling cell behind a cooling coil and/or filter.
User's Guide _______________________________________________________________________ An overpressure in the process is necessary to create a flow through the sampling cell. Note that the pressure of the sampling cell must not differ from that of the process because dewpoint temperature changes with pressure. In dirty processes, it may be necessary to use a filter between the cooling coil and the sampling cell.
Chapter 3 ________________________________________________________________ Installation Optional Modules Power Supply Module The mains power connection may be connected to the power supply module only by an authorized electrician. A readily accessible disconnect device shall be incorporated in the fixed wiring.
User's Guide _______________________________________________________________________ Installation 1. 2. 3. 4. 5. 6. 7. Disconnect the power. Remove the protective plug from the cable gland and thread the wires. In case the power supply module is installed in the factory, continue with the step 5. To attach the module, open the transmitter cover and fasten the power module to the bottom of the housing with four screws. See the position on page 19.
Chapter 3 ________________________________________________________________ Installation Warnings Dieses Produkt entspricht der Niederspannungsrichtlinie (2006/95/EWG). - Das Netzmodul darf nur von einem dazu befugten Elektriker angeschlossen werden. - Trennen Sie das Netzmodul nicht vom Messwertgeber, wenn der Strom eingeschaltet ist. - Verbinden Sie das Netzmodul nur mit der Spannungsquelle, wenn es im Messwertgeber DMT340 montiert ist. - Das Erdungskabel muss zum Schutz immer angeschlossen sein.
User's Guide _______________________________________________________________________ Dette produkt er i overensstemmelse med direktivet om lavspænding (2006/95/EØS). - Netstrømskoblingen til må kun tilsluttes strømforsyningsmodulet af en autoriseret elinstallatør - Strømforsyningsmodulet må ikke løsgøres fra senderen, mens spændingen er sluttet til.
Chapter 3 ________________________________________________________________ Installation Šis produktas atitinka direktyvą dėl žemos įtampos prietaisų (2006/95/EB). - Elektros tinklą su energijos tiekimo moduliu sujungti gali tik įgaliotas elektrikas. - Niekada neišimkite energijos tiekimo modulio iš siųstuvo, kai maitinimas yra įjungtas. - Jei energijos tiekimo modulis nėra įmontuotas DMT340 siųstuve, nejunkite jo į elektros tinklą.
User's Guide _______________________________________________________________________ Galvanic Isolation of the Power Supply If galvanic isolation of the power supply line from the output signals is needed, DMT340 can be ordered with optional galvanic isolation module. This module prevents harmful grounding loops. Installation NOTE Galvanic isolation module is not needed when using the AC power supply module. Note also that these two modules are physically incompatible to be installed at the same time.
Chapter 3 ________________________________________________________________ Installation Installation and Wiring 1. 2. 3. 4. 5. 6. 7. NOTE Disconnect the power. In case the analog output module is installed in the factory, continue with the step 4. To attach the module, open the transmitter cover and fasten the analog output module to the position for MODULE 2 with four screws. Refer to Figure 2 on page 21.
User's Guide _______________________________________________________________________ Alarm Relays DMT340 can be equipped with one or two configurable relay modules. Each module contains two configurable relays. See the contact ratings in section Technical Specifications of Optional Modules on page 168. Installation and Wiring 1. 2. 3. 4. 5. 6. CAUTION Disconnect the power. In case the relay-module is installed in the factory, continue with the step 5.
Chapter 3 ________________________________________________________________ Installation 0503-037 Figure 40 Relay Module The numbers refer to Figure 40 above: 1 2 3 4 = = = = Indication led for the relay 1 or 3 Relay test buttons Flat cable pins Indication led for relay 2 or 4 WARNING The relay module may contain dangerous voltages even if the transmitter power has been disconnected.
User's Guide _______________________________________________________________________ RS-422/485 Interface The RS-422/485 interface enables communication between an RS-485 network and the DMT340 transmitter. The RS-485 interface is isolated and offers a maximum communications rate of 115 200 bits/s. (For maximum bus length of 1 km, use bit rate 19200 b/s or less.
Chapter 3 ________________________________________________________________ Installation Installation and Wiring 1. 2. 3. 4. 5. Disconnect the power. In case the RS-422/485-module is installed in the factory, continue with the item 4. To attach the module, open the transmitter cover and fasten the RS-422/485 module to the bottom of the housing with four screws. Connect the flat cable between the RS-422/485 module and the motherboard's pins MODULE1 (Communications).
User's Guide _______________________________________________________________________ Termination Termination 120R Rx D0Rx D1+ Common Tx D0Tx D1+ 120R Junction box Common line Stub RS485 bus master Twisted pair Address NN Switch Term off Term off 2/4 wire on RS422 off Tx D0Tx D1+ Common Rx D0Rx D1+ Junction box Common line Stub RS485-1 Twisted pair Address MM Switch Term off Term off 2/4 wire on RS422 off Tx D0Tx D1+ Common Rx D0Rx D1+ Junction box 120R 120R Stub RS485-1 Termination Baud > 19
Chapter 3 ________________________________________________________________ Installation Termination 120R D0D1+ Common Junction box Stub RS485 bus master Twisted pair Common line Address NN Switch Term off Term off 2/4 wire off RS422 off Junction box Common D0D1+ Stub RS485-1 Twisted pair Common line Address MM Switch Term off Term off 2/4 wire off RS422 off Junction box Common D0D1+ 120R Stub RS485-1 Termination 1102-027 Figure 43 2-Wire RS-485 Bus Table 7 2-Wire (Switch 3: Off) RS-485 mast
User's Guide _______________________________________________________________________ LAN Interface The optional LAN interface enables an Ethernet connection to the transmitter. The user can establish a virtual terminal session using a Telnet client program such as PuTTY or by using Modbus TCP protocol. When the LAN interface is in use, serial communication using the RS232 User Port is disabled.
Chapter 3 ________________________________________________________________ Installation WLAN Interface The optional WLAN interface enables a wireless Ethernet connection (IEEE 802.11b) to the transmitter. The user can establish a virtual terminal session using a Telnet client program such as PuTTY or by using Modbus TCP protocol. When the WLAN interface is in use, serial communication using the RS-232 User Port is disabled.
User's Guide _______________________________________________________________________ NOTE The default country setting for the WLAN interface is United States, which limits the operation to WLAN channels 1 ... 11. To enable additional channels (12 ... 14), you can change the country setting using the web configuration interface. Attaching the WLAN Antenna The WLAN interface module must be installed at the factory (when ordering the transmitter), or by a Vaisala Service Center.
Chapter 3 ________________________________________________________________ Installation The data logger module has a real time clock with a battery back-up. The clock has been set to the Coordinated Universal Time (UTC) at the factory, and its time cannot be set by the user. The data that is stored in the logger's memory is timestamped using the logger's clock. When date and time are set on the transmitter, they are stored to the transmitter's memory as an offset from the time on the logger's clock.
User's Guide _______________________________________________________________________ 8-Pin Connector 1104-126 Figure 47 Pinout of the Optional 8-Pin Connector Table 9 Wiring of the Optional 8-Pin Connector Pin Wire 1 2 White Brown Serial Signal RS-232 (EIA-232) Data out TX (Serial GND) 3 4 5 6 7 8 Green Yellow Grey Pink Blue Shield/Red Supply Supply + Data in RX Cable shield Analog Signal RS-485 (EIA-485) D1+ (Serial GND) Signal GND (for both channels) Ch 2+ Ch 1 + Supply Supply Supply + Supp
Chapter 4 _________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate this product. Getting Started Within a few seconds after power-up the LED on the cover of the transmitter is lit continuously indicating normal operation. When the transmitter is turned on the first time, the language selection window opens: Select the language with ▼▲ arrow buttons and press the SELECT button (the left-hand button).
User's Guide _______________________________________________________________________ Display/Keypad Basic Display Display shows you the measurement values of the selected quantities in the selected units. You can select 1... 4 quantities for the numerical basic display (see section Changing the Quantities and Units on page 103).
Chapter 4 _________________________________________________________________ Operation Graphic History The graphical display shows the data trend or min/max graph of the selected quantities, one at a time. The graph is updated automatically while measuring. 0706-01 Figure 49 Graphical Display Trend graph: Shows you a curve of average values. Each value is a calculated average over a period. See Table 10. Max/min graph: Shows you the minimum and maximum values in a form of curve.
User's Guide _______________________________________________________________________ - If the optional data logger module is installed, you can scroll the cursor off the screen to move to a new point on the time axis. The new date will be displayed, and the cursor will be centered at the date where the cursor scrolled off the screen.
Chapter 4 _________________________________________________________________ Operation Menus and Navigation You can change settings and select functions in the menus. 1. 2. 3. 4. 5. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons in the basic (numeric) display mode. Move in the menus by using the ▲▼ arrow buttons. Open a submenu with ► button. Press ◄ to return to the previous level. Function button EXIT returns you back to the basic display.
User's Guide _______________________________________________________________________ Changing the Language 1. Go back to the basic display by keeping the right-hand pressed for four seconds. 2. 3. Open the Main menu by pressing any of the ▼▲◄► buttons. Scroll to the System menu option, and press the ► button. The menu option is indicated with the wrench symbol. Scroll to the Language menu option, and press the left-hand button. The menu option is indicated with the flag symbol.
Chapter 4 _________________________________________________________________ Operation Display Contrast Setting Display contrast is automatically adjusted based on the ambient temperature. However, depending on the installation location and viewing direction, it may be necessary to fine-tune the contrast manually. Using Display/Keypad 1. 2. 3. 4. 5. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons. Select ►Display, press the ►arrow button. Select Contrast, press the ADJUST button.
User's Guide _______________________________________________________________________ Menu PIN Lock You can prevent unauthorized changes of the device settings by activating the menu PIN lock. When this function is activated, the basic display, graphical view, and device information displays are available but access to the menus is locked. The key symbol indicates the activation of this feature. 1. 2. 3. 4. 5. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons.
Chapter 4 _________________________________________________________________ Operation Display Alarms The Display Alarm feature provides two independently configurable alarms for transmitters with the display/keypad option. Each alarm tracks a selected quantity, with freely configurable limit values. Each alarm also has a configurable hysteresis value to prevent unnecessary triggering when the measurement fluctuates around an alarm limit.
User's Guide _______________________________________________________________________ revealed when the currently shown alarm is acknowledged by pressing the OK button. Activated alarms are only shown on the screen; there are no alarm messages output to the serial line. After an alarm has been acknowledged, you must refer to the data graphs to see when the measured quantities have exceeded the limits.
Chapter 4 _________________________________________________________________ Operation 6. 7. 8. When modifying the value, use the arrow up and down buttons to change the value under the cursor. Left and right arrow buttons move the cursor. Select the OK button to accept the modified value, or Cancel to undo the modification. Set a suitable Hysteresis value to prevent the alarm from being triggered unnecessarily by small measurement changes that pass the alarm limit repeatedly.
User's Guide _______________________________________________________________________ Table 12 Name above below hyst enabl ALSEL Parameters Description If specified, the alarm goes off when the quantity value rises above the exact value of this setpoint. However, if above < below, the alarm goes off at (above + hyst) and (below – hyst) instead. Cannot be set for fault and online alarms. If specified, the alarm goes off when the quantity value decreases below the exact value of this setpoint.
Chapter 4 _________________________________________________________________ Operation MI70 Link Program for Data Handling MI70 Link is a support program that enables you to handle the measurement data of your Vaisala transmitter using a Windows PC. Using the MI70 Link you can, for example: - Monitor the transmitter’s measurement readings directly using the real-time window function.
User's Guide _______________________________________________________________________ Serial Line Communication Connect the serial interface by using either the user port or the service port. For permanent interfacing to host system, use the User Port. You can change the serial settings and operate in RUN, STOP, POLL, and Modbus modes. For temporary connections use the service port. Service port is always available with fixed serial settings.
Chapter 4 _________________________________________________________________ Operation User Port Connection Use suitable serial cable between the user port RxD, GND and TxD screw terminals and the PC serial port.
User's Guide _______________________________________________________________________ Service Port Connection Connection Cables To connect to the service port, you need a suitable cable with an RJ45 connector. Depending on the connections of your PC, you can either use the Serial Connection Cable (optional accessory 19446ZZ) or the USB-RJ45 Serial Connection Cable (optional accessory 219685). The USB cable enables you to connect the transmitter to a PC via a standard type A USB port.
Chapter 4 _________________________________________________________________ Operation Using the Service Port 1. 2. 3. Open the screws on the transmitter cover, and open the cover. Connect the desired cable (serial interface cable or USB cable) to your PC and the service port connector on the transmitter. For location of the service port, refer to Figure 56 on page 82.
User's Guide _______________________________________________________________________ IP Configuration The IP settings of the LAN and WLAN interfaces are described in Table 15. The current settings can be viewed on the serial line or using the device information display; see section Device Information on page 111.
Chapter 4 _________________________________________________________________ Operation Using Display/Keypad You can configure the IP settings of the LAN and WLAN interfaces using the display/keypad as follows: 1. 2. 3. 4. Press any of the arrow buttons to open the Main Menu. Press the ► arrow button to select Interfaces. Press ► arrow button to select Network settings. There will be a delay as the transmitter refreshes the network information. You are now in the Network Interface menu.
User's Guide _______________________________________________________________________ Using Serial Line Use the serial line command NET to view or set the network settings for the LAN and WLAN interfaces. You can also refresh the network information or disconnect all active connections.
Chapter 4 _________________________________________________________________ Operation >net off 192.168.0.101 255.255.255.0 192.168.0.1 off DHCP : OFF IP address : 192.168.0.101 Subnet mask : 255.255.255.0 Default gateway: 192.168.0.1 Web config. : OFF MAC address : 00:40:9d:2c:d2:05 Status : Connected OK > Wireless LAN Configuration The settings of the WLAN interface are described in Table 16.
User's Guide _______________________________________________________________________ Using Display/Keypad You can configure the Wireless LAN settings using the display/keypad as follows: 1. 2. 3. 4. Press any of the arrow buttons to open the Main Menu. Press the ► arrow button to select Interfaces. Press the ► arrow button to select Network settings. There will be a delay as the transmitter refreshes the network information. Press the ► arrow button to select Wireless LAN settings. 0802-111 Figure 60 5.
Chapter 4 _________________________________________________________________ Operation 7. 8. If you have selected an encrypted network type (WEP or WPA), you must enter the security key to be used. Select the Key/passphrase entry and press the Set button. Enter the key in the same way as the SSID, and press the OK button. With the WEP encryption you must enter the encryption key in hexadecimal (10 hexdecimals for 64-bit encryption or 26 hexadecimals for 128-bit encryption).
User's Guide _______________________________________________________________________ Communication Protocol When a Telnet connection is established via the LAN or WLAN interface, the session has the same communication mode, run interval, poll address and echo settings as the serial port (user port) session would have. These settings can be changed using the display/keypad, using the serial line (user port or service port), or on-the-fly during the Telnet session.
Chapter 4 _________________________________________________________________ Operation 1102-017 Figure 63 Web Configuration Interface for WLAN Terminal Program Settings The instructions below describe how to connect to the DMT340 using the PuTTY terminal application for Windows. Perform the necessary cabling and configuration of the transmitter before following the instructions. PuTTY is available for download at www.vaisala.com.
User's Guide _______________________________________________________________________ Opening a Serial/USB Connection 1. 2. 3. Power up the DMT340 and start the PuTTY application. Select the Serial & USB settings category, and check that the correct COM port is selected in the Serial or USB line to connect to field. Change the port if necessary. If you are using a Vaisala USB cable, you can check the port that it uses by clicking the USB Finder... button.
Chapter 4 _________________________________________________________________ Operation Opening a Telnet Session (LAN/WLAN) NOTE The instructions below assume that the LAN/WLAN interface on the transmitter is correctly configured and the network connection is already done. 1. 2. 3. Power up the instrument and start the PuTTY application. If your transmitter acquires a network address using DHCP, wait for a minute for this to complete, then verify the address from the transmitter.
User's Guide _______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type. The notation refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a to clear the command buffer before starting to enter commands. In the tables below, the bold text in the brackets is the default setting.
Chapter 4 _________________________________________________________________ Operation Table 19 Data Recording Commands Command DIR PLAY [0 ... 24] [START END] Description Lists trend log files Output recorded data file. Start and end times can only be specified if the data logger module is installed. The times must be given in the following format: yyyy-mm-dd hh:mm:ss Select data recording and display quantities (1 ... 4).
User's Guide _______________________________________________________________________ Table 25 Command ? ?? ALSEL CON CDATE CODE CTEXT DATE DSEND ECHO ERRS FIND HELP LIGHT LOCK MODBUS MODS MOL/MOLI PRES RESET TEST TIME UNIT VERS XPRES Other Commands Description Output the information about the device Output the information about the device in POLL-state Set display alarms Set display contrast Adjust the output date/set date when adjustment enabled Display the order configuration code of the transmitter Dis
Chapter 4 _________________________________________________________________ Operation Getting the Measurement Message from Serial Line Starting Continuous Outputting Enter the R command to start the continuous output of measurements. R Example: >r Tdf=-20.6 'C H2O= 958 ppmV x= >r Tdf=-20.7 'C H2O= 958 ppmV T= 23.8 'C RH= 0.6 g/kg 3.3 %RH If a value is too long to fit to the allocated space in the output, or if there is an error in outputting the quantity, the value is displayed with stars ‘*’.
User's Guide _______________________________________________________________________ Outputting Reading Once Use the SEND command to output the reading once in STOP mode. The output format depends on which parameters the transmitter can output. SEND Examples: >send Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg >send Tdf= -5.9 'C Td= -6.6 'C Tdfa= -5.9 'C Tda= -6.6 'C H2O= 3696 ppmV x= 2.3 g/kg RH= 13.9 %RH a= 2.7 g/m3 aNTP= 3.0 g/m3 T= 22.2 'C dT= 28.
Chapter 4 _________________________________________________________________ Operation Outputting Reading Once From All Transmitters Use the DSEND command to output the reading once from all connected transmitters that are in STOP or POLL modes. In order to avoid data collisions, the transmitters will send their response after a suitable delay. The response includes the transmitters’s address, followed by their measurement message.
User's Guide _______________________________________________________________________ Formatting Serial Line Message NOTE Instead of using the FTIME, FDATE and FST commands described in this section, you can use the FORM command with modifiers TIME, DATE, and STAT. See section FORM on page 104. FTIME and FDATE FTIME and FDATE commands will enable/disable output of time and date to the serial line.
Chapter 4 _________________________________________________________________ Operation Example: >fst on Form. status : ON >send w 0 Tdf= 3.9 'C H2O= 8045 ppmV x= aNTP= 6.4 g/m3 T= >purge Purge started, press >send S 120.3 Tdf= 3.8 'C H2O= 7999 ppmV x= aNTP= 6.4 g/m3 T= > Td= 3.9 'C Tdfa= 3.9 'C Tda= 3.9 'C 5.0 g/kg RH= 26.8 %RH a= 5.9 g/m3 24.1 'C dT= 20.3 'C any key to abort... Td= 3.8 'C Tdfa= 3.8 'C Tda= 3.8 'C 5.0 g/kg RH= 12.5 %RH a= 5.6 g/m3 37.4 'C dT= 33.
User's Guide _______________________________________________________________________ To select display units:. 1. 2. 3. 4. 5. NOTE Press any of the arrow buttons to open the Main Menu. Press the ► arrow button to select Display. Use the ▲▼arrow buttons to select Units. Confirm the selection by pressing the right-hand arrow button. Use the ▲▼ arrow buttons to select display units. Confirm the selection by pressing CHANGE. The unit changes from metric to non-metric or the other way round.
Chapter 4 _________________________________________________________________ Operation Modifier ADDR ERR STAT SN TIME DATE CS2 CS4 CSX Description Transmitter address [00...255] Error flags for P, T, Ta, RH [0000 ... 1111], 0 = no error Transmitter status in 7 character field, for example: N 0 no heating h 115 probe heating active, power 115/255 H 159.0 purge heating active, temperature 159ºC S 115.0 purge cooling active, temperature 115ºC X 95.
User's Guide _______________________________________________________________________ where y NOTE = Unit to be used for H20. Options are: PPMV (parts per million by volume) PPMW (parts per million by weight) This command changes both the serial output and display units. When you want to output both metric and non-metric units simultaneously on the display, select the display units later by using the display/keypad.
Chapter 4 _________________________________________________________________ Operation 3. 4. 5. Select Pressure compensation and press the ►arrow button to confirm you selection. Press SET and enter the pressure value by using the arrow buttons. Press OK and EXIT to return to the basic display. Using Buttons on the Motherboard Pressure set buttons (Pchk and Pset) can be used to set the process pressure.
User's Guide _______________________________________________________________________ where aaaa.a = Absolute process pressure (hPa) Example: >pres Pressure >pres 2000 Pressure > Table 27 : 1013.00 hPa ? : 2000.00 hPa Conversion Factors for Pressure Units From mbar PaN/m2 mmHg torr inHg mmH2O inH2O atm at bar 1) psia 1) Psia = psi absolute. To: hPa 1 0.01 1.333224 33.86388 0.09806650 2.490889 1013.25 980.665 1000 68.94757 Example: 29.9213 inHg = 29.9213 x 33.86388 hPa = 1013.
Chapter 4 _________________________________________________________________ Operation Using Serial Line To set time enter the TIME command. To set date enter the DATE command. TIME DATE These time and date settings are shown on the timestamps of PLAY command. When you want to include time and date in the R and SEND commands, use the FTIME and FDATE commands.
User's Guide _______________________________________________________________________ FILT Use the serial line command FILT to set the filtering level. FILT [level] [extfactor] where level = Filtering level. The options are: OFF (no filtering) ON (standard filtering, enabled by default. Approximately 13 s moving average) EXT (extended filtering, approximately 1 min average by default but configurable by changing the extfactor) extfactor = Weighted average factor for extended filtering level. Range 0 .
Chapter 4 _________________________________________________________________ Operation Device Information Use the display/keypad or the serial line to display the device information.
User's Guide _______________________________________________________________________ Example: >? DMT340 / 5.10.0 Serial number : Batch number : Adjust. date : Adjust. info : Date : Time : Serial mode : Baud P D S : Output interval: Address : Echo : Pressure : Filter : Ch1 output : Ch2 output : Ch1 Tdf low : Ch1 Tdf high : Ch2 H2O low : Ch2 H2O high : Module 1 : Module 2 : > D1140055 D0750008 2008-03-17 Helsinki / FIN 2000-01-02 01:33:57 STOP 19200 N 8 1 10 s 0 ON 1013.25 hPa OFF 0...1V 0...1V -20.
Chapter 4 _________________________________________________________________ Operation HELP Use the HELP command to list the currently available commands. The available commands are determined by the device configuration and installed options.
User's Guide _______________________________________________________________________ VERS Use the VERS command to display software version information. Example: >vers DMT340 / 5.10 > Resetting the Transmitter Using Serial Line RESET The RESET command resets the transmitter. The user port switches to start-up output mode selected with command SMODE. Locking Menu/Keypad Using Serial Line LOCK Use the LOCK command to prevent the user from entering the menu using the keypad, or to lock the keypad completely.
Chapter 4 _________________________________________________________________ Operation Examples: >lock 1 4444 Keyboard lock > : 1 [4444] >lock 1 Keyboard lock > : 1 Serial Output Settings The communication settings for the user port can be changed via the serial line or by using the optional display/keypad. The communication settings for the service port are fixed and not changeable.
User's Guide _______________________________________________________________________ 6. 7. 8. 9. Select the RUN interval and the unit. Press OK to confirm. Select the Device address and press SET to confirm. Select ECHO, and press ON to turn to it on, OFF to turn it off. Press EXIT to return to the basic display. The new user port settings set using the display/keypad are effective immediately.
Chapter 4 _________________________________________________________________ Operation SMODE Use the SMODE command to set the user port start-up operating mode. SMODE [xxxx] where xxx = STOP, RUN, POLL, or MODBUS. Table 29 Mode STOP RUN POLL Selection of Output Modes Measurement Output Only with the SEND command. Automatic output. Only with the SEND [addr] command. MODBUS Must be read from the transmitter using Modbus protocol. Available Commands All (default mode). Only command S.
User's Guide _______________________________________________________________________ INTV Use the INTV command to set the RUN mode output interval. The time interval is used only when the RUN mode is active. Setting the interval to zero enables the fastest possible output rate. INTV [xxx yyy] where xxx yyy = Delay, range 0 ... 255. = Unit: S, MIN or H.
Chapter 4 _________________________________________________________________ Operation Data Recording Data recording function is always on and collects data automatically into the memory of the device. If the optional data logger module is installed, the transmitter uses it automatically. Recorded data does not disappear from the memory when the power is switched off.
User's Guide _______________________________________________________________________ View Recorded Data If the device is provided with the optional display, the graphical display shows the data of the selected quantities, one at a time. See section Graphic History on page 71 for details about graphical display. DIR Use the serial line and enter the DIR command to check the available files.
Chapter 4 _________________________________________________________________ Operation PLAY Use the PLAY command to output the selected file to the serial line. If the data logger module is installed, you can specify an interval to be outputted. Data in the output is delimited. This is compatible with most spreadsheet programs. Before giving the command, set the local date and time with TIME and DATE commands, if needed.
User's Guide _______________________________________________________________________ Deleting the Recorded Files You can delete the recorded data files using the keypad/display, or the DELETE command on the serial line. The deletion is always done for all data; you cannot delete individual files. Note that the transmitter automatically overwrites the old data when the memory is full, so manual deletion of the recorded files is not necessary in normal use.
Chapter 4 _________________________________________________________________ Operation Analog Output Settings The analog outputs are set in the factory according to the order form. In case you want to change the settings, follow these instructions. See section Third Analog Output on page 56. Changing the Output Mode and Range Both output channels have their own dip switch module with 8 switches, see the position in Figure 2 on page 21 (dip switches for analog output settings). 1. 2.
User's Guide _______________________________________________________________________ Example: 0 ... 5 V voltage output selected for channel 1 and 4...20 mA selected for channel 2. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 NOTE OFF █ █ █ █ █ █ █ █ █ █ █ █ ON Selection █ Voltage output selected █ 0 ... 5 V selected █ Current output selected █ 4 ... 20 mA selected If you have customized the error output setting (AERR), check that the set error values are still valid after changing the output mode/range.
Chapter 4 _________________________________________________________________ Operation AMODE/ASEL Use the serial line to select and scale the analog output quantities. Check the analog output modes with the AMODE command. AMODE Example: >amode Ch1 output Ch2 output > : 0...1V : 0...1V Select and scale the quantities for the analog outputs with the command ASEL. Note that the optional quantities can be selected only if they have been selected when ordering the device.
User's Guide _______________________________________________________________________ Analog Output Tests Use the display/keypad to test the operation of the analog outputs by forcing the outputs to known values. Measure then the values with a current/voltage meter. Use the display/keypad for testing. 1. 2. 3. 4. 5. 6. Press any of the arrow buttons to open the Main Menu. Select System by pressing the ► arrow button. Select Diagnostics by pressing the ► arrow button.
Chapter 4 _________________________________________________________________ Operation Analog Output Fault Indication Setting Factory default state for analog outputs during error condition is 0 V/ 0mA. Please be careful when selecting the new error value. The error state of the transmitter should not cause unexpected problems in process monitoring. Use the display/keypad to set the analog output fault indication. 1. 2. 3. 4. 5. 6. Press any of the arrow buttons to open the Main Menu.
User's Guide _______________________________________________________________________ Extend Analog Output Range Use the AOVER command to allow the analog output channels to exceed their specified range by 10%. The scaling of the parameter remains as before; the extra range is used for additional measurement range in the high end of the scale. AOVER [ON/OFF] Example: >aover on Extended output: ON > The following example illustrates how the analog output is affected.
Chapter 4 _________________________________________________________________ Operation 1102-007 Figure 69 Measurement-Based Relay Output Modes Mode 4 is usually used if an alarm needs to be triggered when the measured value exceeds a safe range. The relay is active when measurement is in range, and is released if the value goes out of range or the measurement fails. NOTE If the measurement of the selected quantity fails or the transmitter loses its power, the relay is released.
User's Guide _______________________________________________________________________ Hysteresis Hysteresis function is to prevent the relay switching back and forth when measured value is near to the setpoint values. Relay is activated when the measured value passes the exact value of the setpoint. When returning and passing the setpoint again relay is released only until the value reaches the setpoint increased/decreased by the hysteresis value.
Chapter 4 _________________________________________________________________ Operation ONLINE STATUS Live measurement (data available): relay active (C and NO outputs are closed) No live data (for example: error state, sensor purge or adjustment mode): relay released (C and NC outputs are closed) See Figure 70 on page 131 for illustrative examples of the FAULT/ONLINE STATUS relay output modes.
User's Guide _______________________________________________________________________ Table 30 Relay State Examples Criterion for Relay Activation Transmitter Operation Status NC-C Connected NO-C Connected Not chosen Power off Td/f below -10 °C* Td/f above -10 °C * Measured Td/f above -10 °C Measured Td/f below -10 °C Measured Td/f above -10 °C Measured Td/f below -10 °C Measurement OK Fault status Error active Measurement live Purge, AutoCal, or sensor warming active * Hysteresis has an effect
Chapter 4 _________________________________________________________________ Operation Setting the Relay Outputs NOTE When you have only one relay module installed, its relays are called “relay 1” and “relay 2”. When you have two relay modules, the relays of the module connected to slot MODULE 1 are called “relay 1” and “relay 2” and relays connected to slot MODULE 2 are called “relay 3” and “relay 4”. 0706-013 Figure 71 Relay Availability Number refers to Figure 71 above: 1 = Lists enabled relays.
User's Guide _______________________________________________________________________ RSEL Use the serial line to select the quantity, setpoints and hysteresis or enable/disable the relay outputs. Enter the RSEL command. RSEL [q1 q2 q3 q4] where q1 = Quantity for the relay 1 or Fault/Online q2 = Quantity for the relay 2 or Fault/Online q3 = Quantity for the relay 3 or Fault/Online q4 = Quantity for the relay 4 or Fault/Online Factory setting: All relays disabled.
Chapter 4 _________________________________________________________________ Operation Example of using relay 1 as fault alarm: selecting relay 1 to follow the fault status and relay 2 to follow the temperature measurement. >rsel fault t Rel1 FAUL above: Rel1 FAUL below: Rel1 FAUL hyst : Rel1 FAUL enabl: Rel2 T above: Rel2 T below: Rel2 T hyst : Rel2 T enabl: ON ? 0.00 'C ? 30 0.00 'C ? 0.00 'C ? 2 OFF ? ON Testing the Operation of Relays Testing activates relays even if they are disabled.
User's Guide _______________________________________________________________________ Sensor Functions AutoCal To obtain the best possible accuracy in measurements taken in dry environments, DMT340 has a built-in AutoCal. During the AutoCal, DMT340 adjusts the dry-end reading to correspond to the calibrated values. This is a unique and patented method to avoid errors in accuracy when monitoring low dewpoints.
Chapter 4 _________________________________________________________________ Operation Manual AutoCal To check that AutoCal has taken place for obtaining the most accurate measurement in a very dry environment, you can perform Autocal manually before measuring as follows: 1. 2. 3. 4. Open the Main Menu by pressing any of the arrow buttons. Select Measuring, press the ►arrow button. Select Manual AutoCal, press the ►arrow button. Press START to start AutoCal.
User's Guide _______________________________________________________________________ A sensor purge should be performed always before calibration (see the calibration instructions) or when there is a reason to believe that a sensor has become exposed to an interfering chemical. Starting and Configuring Sensor Purge Using Display/Keypad (Optional) 1. Open the Main Menu by pressing any of the ▼▲◄► arrow buttons. 2. Select ►Measuring, press ►button. 3. Select ►Purge, press ► button.
Chapter 4 _________________________________________________________________ Operation Using Serial Line PURGE Use the PURGE command to start the sensor purge immediately. PURGE Example: >purge Purge started, press any key to abort. > The prompt '>' appears when the heating period is over. However, the transmitter outputs are locked to the values measured before performing sensor purge until the settling time is over.
User's Guide _______________________________________________________________________ Example (no data logger module installed): >pur Interval Purge Interval Power-up Purge Duration Settling Temperature Temp. diff. Trigger Purge RH trigger > : : : : : : : : : ON ? 1440 min ? ON ? 120 s ? 240 s ? 160 'C ? 0.5 'C ? OFF ? 20 %RH ? Example (with data logger module installed): >pur Interval Purge : Interval : Next Purge date: Next Purge time: Power-up Purge : Duration : Settling : Temperature : Temp. diff.
Chapter 5 ___________________________________________________________________ Modbus CHAPTER 5 MODBUS This chapter contains information that is needed when operating the transmitter using the Modbus protocol. Overview of Modbus Protocol Support The DMT340 transmitter can be accessed using the Modbus serial communication protocol. Support for Modbus protocol is available on all DMT340 transmitters as a standard feature from software version 5.10 onward.
User's Guide _______________________________________________________________________ Taking Modbus into Use To take the Modbus protocol into use on the DMT340, you must perform some configuration tasks using the built-in display and keypad (optional) or a PC connected to the serial line. For example, you can connect to the service port using the USB service cable (Vaisala order code: 219685). The transmitter must be powered from a suitable power supply during configuration.
Chapter 5 ___________________________________________________________________ Modbus Enabling Serial Modbus In addition to enabling the Modbus protocol in the device, Modbus over RS-232 or RS-485 needs the following software settings: serial bit rate, parity, number of stop bits, and Modbus device address. Using Display/Keypad (Optional) 1. 2. 3. Open the Main Menu by pressing any of the ▼▲◄► arrow buttons. Navigate to Interfaces ► Serial Interface.
User's Guide _______________________________________________________________________ 6. Use the SMODE command to enable the Modbus mode: >smode modbus Serial mode > 7. : MODBUS If necessary, use the SERI command to check and/or change the serial interface settings for the User Port. For example, to set the User Port serial settings to 19200 N 8 1, issue the following command: >seri 19200 N 8 1 NOTE The number of data bits must always be 8 for Modbus RTU.
Chapter 5 ___________________________________________________________________ Modbus 1101-034 Figure 76 4. 5. IP Configuration Navigate back to the Network Settings menu. If you are using the WLAN interface, select Wireless LAN Settings. On the Wireless LAN Settings screen, set the network name (SSID) and security options, and exit to save the changes. 1101-036 Figure 77 6. 7. Wireless LAN Settings Navigate back to the Network Settings menu. Select Communication Protocol.
User's Guide _______________________________________________________________________ Using Serial Line 1. 2. 3. 4. 5. 6. Open the transmitter cover. Connect power supply wiring (if not using the power supply module) and power up the transmitter. Connect the USB service cable between a computer and the service port of the transmitter.
Chapter 5 ___________________________________________________________________ Modbus For a description of the available settings, see section Wireless LAN Configuration on page 89. 8. The Modbus configuration is now complete. Reset or power cycle the transmitter to enable the Modbus mode, and proceed with the installation of the transmitter. Diagnostic Modbus Counters DMT340 has diagnostic counters that can be used to pinpoint Modbus problems.
User's Guide _______________________________________________________________________ The last message displayed may be incomplete if there is active Modbus traffic while using the MODBUS command. Modbus RTU only: If the last received message was rejected because of bad CRC checksum, the MODBUS command displays the message with corrected CRC (last two bytes updated).
Chapter 6 _______________________________________________________________ Maintenance CHAPTER 6 MAINTENANCE Periodic Maintenance Cleaning Clean the transmitter enclosure with a soft, lint-free cloth moistened with mild detergent. Changing the Probe Filter NOTE Some probe and filter combinations are equipped with a washer under the filter. The purpose of the washer is to prevent vibration from loosening the filter. If the washer is present, leave it in place when changing the filter. 1. 2.
User's Guide _______________________________________________________________________ Error States In error state the affected quantities are not measured and the output is shown as follows: - Analog channel outputs 0 mA or 0 V (you can use the serial line command AERR or display/keypad to change this fault indication value, see section Analog Output Fault Indication Setting on page 127). - Serial port outputs stars "***" instead of measurement data. - Display shows "----" instead of measurement data.
Chapter 6 _______________________________________________________________ Maintenance Table 32 Error Code E0 E1 E2 E3 E4 E5 E6 E7 E9 E10 E11 E12 … E13 E14 E15 E18 E19 E20 … E22 E24 … E25 E26 E28 … E29 E30 E31 Error Messages Error Message Humidity sensor measurement malfunction. Humidity sensor short circuit Humidity sensor open circuit Temperature sensor open circuit. Temperature sensor short circuit. Temperature measurement malfunction Temperature sensor current leak.
User's Guide _______________________________________________________________________ Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com.
Chapter 7 ___________________________________________________ Calibration and Adjustment CHAPTER 7 CALIBRATION AND ADJUSTMENT Calibration DMT340 is fully calibrated and adjusted as shipped from the factory. The typical calibration interval is two years. Calibration must always be done when there is reason to believe that the device is not within the accuracy specifications. It is recommended that the device is sent to a Vaisala Service Center for calibration and adjustment.
User's Guide _______________________________________________________________________ To ensure the correctness of the adjustment, the reference dewpoint meter must be calibrated at a recognized laboratory with a known uncertainty and traceability to national or international standards. To see when the adjustment was made last, select Adjustment information (with keypad INFO button in the main view, or with serial commands ? and CDATE) or check the date from the Device information.
Chapter 7 ___________________________________________________ Calibration and Adjustment Adjustment Information Adjustment information is shown on the device information screens; see section Device Information on page 111. Use the display/keypad to feed the adjustment information. 1. 2. 3. 4. 5. If you are not in the adjustment menu, press the ADJ button on the motherboard to open the ADJUSTMENT MENU. Press the ► arrow button to select Adjustment info. Select Date, press SET.
User's Guide _______________________________________________________________________ Adjusting Dewpoint Td/f Before adjusting dewpoint, first carry out the two-point relative humidity adjustment, which will ensure the basic adjustment level. After that, continue with the actual Td/f adjustment. Two-Point Relative Humidity Adjustment using Display/Keypad For DMT340 M-sensor, the humidity references of 0 % (for example Nitrogen) and 10 ... 20 % are required.
Chapter 7 ___________________________________________________ Calibration and Adjustment 4. Press GRAPH to follow the RH and T stabilization on graphical display: 0706-020 Figure 83 5. Following the RH Trend on Graphical Display Follow the instructions on the display. Use the arrow buttons to enter the actual humidity of the reference used. 0706-021 Figure 84 6. Ending Adjustment of Point 1 Continue adjustment of point 2 as instructed by the display: 0706-022 Figure 85 7. 8.
User's Guide _______________________________________________________________________ Two-Point Relative Humidity Adjustment using Serial Line Perform purge before adjustment. Use the PURGE command. See section PURGE on page 139. Then press adjustment button on the motherboard inside the transmitter to enable adjustments Perform adjustment with the FCRH command. Wait at least 1 hour before adjusting each point. FCRH Example: >fcrh RH : 3.90 Ref1 ? 0 Press any key when ready ... RH : 3.
Chapter 7 ___________________________________________________ Calibration and Adjustment 0706-024 Figure 87 5. 6. Following Stabilization Purge will be performed next. Follow the purge progress on the display. Let the sensor stabilize for at least 1 hour after the purge before proceeding with the adjustment. Press READY when stabilized. 0706-025 Figure 88 7. 8. Proceeding with T d/f Adjustment Enter the actual reference frostpoint temperature. The transmitter performs T d/f adjustment.
User's Guide _______________________________________________________________________ One-Point Dewpoint Adjustment using Serial Line 1. 2. 3. 4. Let the sensor stabilize for at least 5 hours. Use the PURGE command to start the manual purge. See section PURGE on page 139. Wait at least 1 hour. Then press adjustment button on the motherboard inside the transmitter to enable adjustments. Use the IKØ command to perform the adjustment. IKØ Example: >ik0 Tf : -19.74 'C Ref ? -60 Wait for AutoCal data...
Chapter 7 ___________________________________________________ Calibration and Adjustment Adjusting Temperature Adjusting Temperature using Display/Keypad Use preferably the display/keypad to adjust the temperature. 1. 2. 3. 4. 5. 6. Press the ADJ button on the motherboard to open the ADJUSTMENT MENU Press the ► arrow button to select Adjust T measurement. Select by pressing 1-point or 2-point adjustment. Press START to start adjusting.
User's Guide _______________________________________________________________________ Adjusting Temperature using Serial Line CT Use the serial line command CT to adjust the temperature. 1. 2. 3. 4. Press the ADJ button on the motherboard to open the adjustment mode. Remove the probe filter and insert the probe into the reference temperature. Use the CT command and press ENTER. Type C and press ENTER to check if the reading is stabilized.
Chapter 7 ___________________________________________________ Calibration and Adjustment Adjusting Analog Outputs In the analog output calibration the analog output is forced to the following values: current output voltage output = 2 mA and 18 mA = 10 % and 90 % of the range Connect DMT340 to a calibrated current/voltage meter in order to measure either current or voltage depending on the selected output type. Use the display/keypad or the serial line to do this.
User's Guide _______________________________________________________________________ Adjusting Analog Outputs using Serial Line ACAL Use the serial line to perform the analog output adjustment. Use the ACAL command and enter the multimeter reading. ACAL Example (current outputs): >ACAL Ch1 Ch1 Ch2 Ch2 > I1 I2 I1 I2 (mA) (mA) (mA) (mA) ? ? ? ? 2.046 18.087 2.036 18.071 Press the adjustment button on the motherboard inside the transmitter again to disable the adjustment function.
Chapter 8 _____________________________________________________________ Technical Data CHAPTER 8 TECHNICAL DATA Specifications Performance Measured variables Dewpoint Sensor Vaisala DRYCAP®180M Measurement range For continuous use -70 ... +80 °C (-94 ... +176 °F) Td -70 ... +45 °C (-94 ... +113 °F) Td Accuracy Dewpoint temperature (°C) up to 20 bar / 290 psia 20 ... 50 bar / 290 ...
User's Guide _______________________________________________________________________ ppmv (dry) Measurement range (typical) 10 ...
Chapter 8 _____________________________________________________________ Technical Data Relay outputs (optional) Display (optional) Menu languages 0.
User's Guide _______________________________________________________________________ Technical Specifications of Optional Modules Power Supply Module Operating voltage Connections Bushing Operating temperature Storage temperature 100 ... 240 VAC 50/60 Hz screw terminals for 0.5 ... 2.5 mm2 wire (AWG 20 ... 14) for 8 ... 11 mm diameter cable -40 ... +60 °C (-40 ... +140 °F) -40 ... +70°C (-40 ... +158 °F) UL file number E249387 Analog Output Module Outputs 0 ... 20 mA, 4 ... 20 mA, 0 ... 1 V, 0 ...
Chapter 8 _____________________________________________________________ Technical Data RS-485 Module Operating temperature range Operating modes Operating speed max Bus isolation Power consumption at 24V External loads standard loads Storage temperature range Max wire size -40 ... +60 ºC (-40 ... +140 ºF) 2-wire (1-pair) half duplex 4-wire (2-pair) full duplex 115.2 kbaud 300VDC max 50 mA 32 RL> 10kohm -55 ... +80 ºC (-67 ... +176 ºF) 1.
User's Guide _______________________________________________________________________ Spare Parts and Accessories Information on spare parts, accessories, and calibration products is available online at www.vaisala.com and store.vaisala.com.
Chapter 8 _____________________________________________________________ Technical Data Description CONNECTION CABLES Serial Interface Cable USB-RJ45 Serial Interface Cable MI70 Connection Cable with RJ45 Connector OUTPUT CABLES FOR 8-PIN CONNECTOR Connection Cable 5m 8-pin M12 Female, Black Female Connector 8-pin M12 with Screw Terminals Male Connector 8-pin M12 with Cable and Adapter CABLE BUSHINGS Cable Gland M20×1.5 for 8 ... 11mm Cable Cable Gland M20×1.5 for 11 ... 14mm Cable Conduit Fitting M20×1.
User's Guide _______________________________________________________________________ 27.5 (1.08) 71 (2.80) 77 (3.03) Dimensions (mm/inch) 53.5 (2.10) 38 (1.50) 38 (1.50) 53.5 (2.10) 183 (7.20) ø 7 (0.28) 96 (3.78) 116 (4.57) 169 (6.
Chapter 8 _____________________________________________________________ Technical Data 92 (3.62) 116 (4.57) 183 (7.
User's Guide _______________________________________________________________________ 0503-044 Figure 94 DMT342 Probe Dimensions 0804-059 Figure 95 DMT344 Probe Dimensions 174 __________________________________________________________________ M210704EN-G
Chapter 8 _____________________________________________________________ Technical Data 0804-129 Figure 96 DMT347 Probe Dimensions 0704-054 Figure 97 DMT348 Standard Probe Dimensions VAISALA _______________________________________________________________________ 175
User's Guide _______________________________________________________________________ 0704-056 Figure 98 NPT 1/2" Nut Dimensions 0704-055 Figure 99 DMT348 Optional 400mm Probe Dimensions 176 __________________________________________________________________ M210704EN-G
Appendix A _______________________________________________________ Calculation Formulas APPENDIX A CALCULATION FORMULAS This Appendix contains the formulas used for the calculated output quantities. The DMT340 series transmitters measure relative humidity and temperature. From these values dewpoint, mixing ratio, absolute humidity and enthalpy in normal pressure are calculated using the following equations: Dewpoint: Td = Tn m −1 Pw log A (1) Pw is the water vapor pressure.
User's Guide _______________________________________________________________________ Absolute humidity: a = 216.68 ⋅ (3) Pw T Enthalpy: h = (T − 273.15) ⋅ (1.01 + 0.00189 ⋅ x) + 2.5 ⋅ x (4) The water vapour saturation pressure Pws is calculated by using two equations (5 and 6): (5) 3 Θ = T − ∑ CiT i i =o where: T Ci C0 C1 C2 C3 = = = = = = temperature in K coefficients 0.4931358 -0.46094296 * 10-2 0.13746454 * 10-4 -0.
Appendix A _______________________________________________________ Calculation Formulas The water vapor pressure is calculated using: Pw = RH ⋅ Pws 100 (7) Parts per million by volume is calculated using: Pw ppmv = 10 ⋅ ( p − Pw ) 6 (8) Symbols: Td = Pw = Pws = RH = x = p = a = T = h = dewpoint temperature (°C) water vapour pressure (hPa) water vapour saturation pressure (Pa) relative humidity (%) mixing ratio (g/kg) atmospheric pressure (hPa) absolute humidity (g/m3) temperature (K) enthalpy (kJ/k
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Appendix B _________________________________________________________ Modbus Reference APPENDIX B MODBUS REFERENCE This appendix describes the Modbus functions and data of the transmitter. Function Codes DMT340 supports all Modbus conformance class 0 and class 1 function codes defined in Open Modbus/TCP Specification, Release 1.0.
User's Guide _______________________________________________________________________ Register Map All data available via the Modbus interface is grouped in six contiguous blocks of registers as described in Table 37 below.
Appendix B _________________________________________________________ Modbus Reference NOTE A complete 32-bit floating point value should be read and written in a single Modbus transaction (e.g. function codes 05, 06, and 22 do not have an effect on floating point values). 16-Bit Integer Format 16-bit integer values are scaled to include the necessary decimals (see corresponding register table for the scaling factor).
User's Guide _______________________________________________________________________ use the floating point registers to write values outside this 16-bit signed integer range. Maximum writable value is 32767 also for configuration registers that do not accept negative values.
Appendix B _________________________________________________________ Modbus Reference Status Registers (Read-Only) Table 39 Status Registers Name Fault status Online status Error code (bits 15…0) Error code (bits 31…16) Address 0513 0514 0516 0517 Description 1 = No errors 1 = Online data available Bit field that represents the error codes listed in Table 32 on page 151. Active errors are set to 1. For example, if bit 14 is set to 1, error code E14 is active.
User's Guide _______________________________________________________________________ Configuration flags are used to select some basic options of the instrument and to manually start the sensor operations.
Appendix B _________________________________________________________ Modbus Reference Diagnostic Sub-Functions DMT340 supports some of the Modbus diagnostic functions described in the Modbus Application Protocol Specification V1.1b. These diagnostic functions are accessed with function code 08. See Table 43 below for details.
User's Guide _______________________________________________________________________ Device Identification Objects DMT340 Modbus conforms to the extended identification level defined in the Modbus Application Protocol Specification V1.1b. Both stream access and individual access to the objects is supported.
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