USER'S GUIDE Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 M210762EN-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 2014 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 .......................................................................... 13 About This Manual ................................................................. 13 Contents of This Manual ..................................................... 13 Version Information ............................................................. 14 Related Manuals .................................
User's Guide _______________________________________________________________________ Probe and Cooling Set Mounting with Process Running .......................................................................... 39 Removing the Transmitter for Maintenance ................... 39 Wiring ....................................................................................... 40 Cable Bushings ................................................................... 40 Cable Grounding .................................
_________________________________________________________________________________ IP Configuration .................................................................. 80 Using Display/Keypad .................................................... 81 Using Serial Line ............................................................ 82 Wireless LAN Configuration ................................................ 83 Using Display/Keypad .................................................... 84 Using Serial Line ..........
User's Guide _______________________________________________________________________ ADDR ........................................................................... 112 INTV ............................................................................. 113 SDELAY ....................................................................... 113 ECHO ........................................................................... 113 Data Recording .....................................................................
_________________________________________________________________________________ Diagnostic Modbus Counters ............................................. 143 Viewing Counters Using Display/Keypad .......................... 143 Viewing Counters Using Service Port ............................... 143 Disabling Modbus ................................................................ 144 CHAPTER 6 MAINTENANCE .........................................................................................
User's Guide _______________________________________________________________________ APPENDIX A EXAMPLE INSTALLATION OF DMT346 .................................................. 171 APPENDIX B CALCULATION FORMULAS ..................................................................... 173 APPENDIX C MODBUS REFERENCE ............................................................................. 177 Function Codes..................................................................... 177 Register Map ..........
_________________________________________________________________________________ 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 Web Configuration Interface for WLAN .................................... 87 Opening a Serial Connection................................
_________________________________________________________________________________ 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 Table 46 Table 47
User's Guide _______________________________________________________________________ Table 53 Table 54 Table 55 Modbus Diagnostics ............................................................... 183 Modbus Device Identification.................................................. 184 Modbus Exception Responses ...............................................
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and maintaining Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346. 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 _______________________________________________________________________ - Appendix B, Calculation Formulas, contains the formulas used for the calculated output quantities. - Appendix C, Modbus Reference, describes the Modbus functions and data of the transmitter. Version Information Table 1 Manual Revisions Manual Code M210726EN-G M210726EN-F M210726EN-E Description June 2014. This manual.
Chapter 1 _________________________________________________________ General Information NOTE Note highlights important information on using the product. Safety The DMT345/346 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 _______________________________________________________________________ Recycling Recycle all applicable material. Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse.
Chapter 1 _________________________________________________________ General Information cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
User's Guide _______________________________________________________________________ Software License This product contains software developed by Vaisala. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group. Warranty Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features and advantages of the Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346. Introduction to DMT345 and DMT346 The DMT345 and DMT346 transmitters incorporate the advanced Vaisala DRYCAP® technology, which enables reliable and accurate dewpoint measurement.
User's Guide _______________________________________________________________________ Table 3 Output Quantities for DMT345 Quantity Dewpoint/frost point temperature (Td/f ) Mixing ratio (x) Relative humidity RH Temperature T Table 4 Quantity Dewpoint temperature (Td/f) Mixing ratio (x) Sensor saturation rate Sensor temperature Metric Unit ºC g/kg %RH ºC Non-Metric Unit ºF gr/lb %RH ºF Optional Output Quantities and for DMT345 Quantity Parts per million Absolute humidity (a) Absolute humidity in stan
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, optional third analog output Installation accessories - DMT345: mounting flange - DMT346: cooling set for high temperature applications.
User's Guide _______________________________________________________________________ Structure of the Transmitter 1104-001 Figure 1 Transmitter Body The following 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 22 ___________________________________________________________________ M210762EN-G
Chapter 2 ___________________________________________________________ Product Overview 0604-006 Figure 2 Inside the Transmitter The following 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 p
User's Guide _______________________________________________________________________ Probes and Cooling Set 0604-007 Figure 3 Probes, Cooling Set Figure 3 above shows from left to right: DMT345 probe, DMT346 probe and the cooling set. For probe cable lengths, see Table 44 on page 165.
Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install this product. Selecting Location Finding a suitable site for the dewpoint measurement probe is important for getting representative process or environmental measurements. The location of the probe should provide a good representation of the area of interest. Also select a location that is as clean as possible.
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 Metal mounting plate is included in rain shield with installation kit and installation kit for pole or pipeline. 0604-011 Figure 7 Mounting with Metal Wall Mounting Plate The following numbers refer to Figure 7 above: 1 2 = = 3 = Mount the plate to wall with 4 screws M8 (not provided) Fasten the transmitter to the mounting plate with 4 fixing screws M6 (provided) Note the position of the arrow when mounting.
User's Guide _______________________________________________________________________ 0604-012 Figure 8 Dimensions of the Metal Mounting Plate (in mm) 28 ___________________________________________________________________ M210762EN-G
Chapter 3 ________________________________________________________________ Installation Mounting with DIN Rail Installation Kit DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and 2 screws M4 × 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 the transmitter to the plastic mounting plate with 4 screws (provided).
User's Guide _______________________________________________________________________ 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 27.
Chapter 3 ________________________________________________________________ Installation Mounting Rain Shield with Installation Kit The rain shield is highly recommended for outdoor installations, especially for transmitters with the display/keypad option.
User's Guide _______________________________________________________________________ 0704-002 Figure 13 Panel Mounting Frame The following numbers refer to Figure 13 above: 1 2 = = Panel (not included) Panel mounting frame 0804-083 Figure 14 Panel Mounting Dimensions (mm/inch) 32 ___________________________________________________________________ M210762EN-G
Chapter 3 ________________________________________________________________ Installation DMT345 Probe Mounting 0604-018 Figure 15 DMT345 Probe Dimensions (mm/inch) Installation with Flange The DMT345 is a small size (d = 12 mm) general purpose probe suitable for installation through process or duct walls with the flange installation kit available from Vaisala.
User's Guide _______________________________________________________________________ NOTE NOTE When the temperature difference between the process or duct and the surroundings is large, the probe must be installed as deep in the process or duct as possible. This prevents errors caused by heat conduction in the probe cable.
Chapter 3 ________________________________________________________________ Installation Description of the Cooling Set 304 164 112.5 40.6 ø105 ø118 ø28 ø20 ø88.9 8 15 120 27.5 sintered filter (fixed on top of the cooling set) 125 cooling element Figure 18 mounting flange cooling fins Cooling Set Dimensions (in mm) The cooling set consists of a cooling element and removable cooling fins.
User's Guide _______________________________________________________________________ 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. NOTE 0604-022 Figure 19 Measurement Ranges with and without the Cooling Fins Parts of the Cooling Set A 15° 22 flange 172 104.
Chapter 3 ________________________________________________________________ Installation max. 50 125 8 welding ø105 ø118 ø88.9 ø84.9 2 lengthening piece (pipe) mounting pipe M6×16 DIN912 (AISI 316) 0605-023 Figure 21 Mounting Flange Dimensions (in mm) General Probe and Cooling Set Mounting Instructions Follow these general mounting instructions to make the installation.
User's Guide _______________________________________________________________________ 5. Lock the probe in place by tightening the locking screws on the bar. sealing material (for example, mineral wool) ® DRYCAP sensor cooling sleeve cooling fins to be welded ø89.5 + 0.5 PROCESS (t max = 350 °C) mounting flange PROBE locking screws of the probe M4×6 DIN 916 (AISI 316) 120 marking hole O-ring FPM 125 (max. 175 mm) protective tube channel with mineral wool 8 40.
Chapter 3 ________________________________________________________________ Installation Probe and Cooling Set Mounting with Process Shut Down Complete the entire mounting process as instructed on page 37. Probe and Cooling Set Mounting with Process Running Follow this procedure to reduce the amount of condensation that builds up in the installation hole. 1. 2.
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 Cable Grounding Ground the screen of the electrical cable properly to achieve the best possible EMC performance. 0605-027 Figure 25 Grounding the Screen of Electrical Cable Refer to Figure 25 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 22. 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 27 on page 44). 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 27).
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 of the power module in Figure 2 on page 23.
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 DMT345/346 montiert ist.
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 DMT345/346 siųstuve, nejunkite jo į elektros tinklą.
User's Guide _______________________________________________________________________ Galvanic Isolation of Power Supply If galvanic isolation of the power supply line from the output signals is needed, DMT345/346 can be ordered with optional galvanic isolation module. This module prevents harmful grounding loops. 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. Disconnect the power. In case the analog output module is installed in the factory, continue with the step 4. Open the transmitter cover and and fasten the analog output module to the position for MODULE 2 with four screws. Refer to Figure 2 on page 23. Connect the flat cable between the analog output module and the motherboard's connector for MODULE 2.
User's Guide _______________________________________________________________________ Alarm Relays DMT345/346 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 166. 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 0605-032 Figure 32 Relay Module The following numbers refer to Figure 32 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 _______________________________________________________________________ 2 3 1 1102-023 Figure 33 RS-422/485 Module The following numbers refer to Figure 33 above: 1 2 3 NOTE = = = Flat cable pins Selection switches Screw terminals for wiring The data lines on earlier versions of the RS-422/485 module are marked A and B instead of D1+ and D0-. When the line is idle, D1+ has positive voltage compared to D0-.
Chapter 3 ________________________________________________________________ Installation Table 6 Connecting Twisted Pair Wires to Screw Terminals Screw Terminal Data Line (2-wire RS-485) Data Line (4-wire RS-485/422) 1 2 3 4 5 (not connected) (not connected) Common D0D1+ Rx D0Rx D1+ Common Tx D0Tx D1+ To avoid problems in the RS-422/485 network, the Common terminal should be wired to the corresponding terminals of the other devices. 6.
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 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 35 2-Wire RS-485 Bus Table 8 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 39 Pinout of the Optional 8-Pin Connector Table 10 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) Supply – Supply + D0Cable shield Signal GND (for both channels) Ch
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 Quantities and Units on page 97).
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. 0706-028 Figure 41 Graphical Display Trend graph: Shows you a curve of average values. Each value is a calculated average over a period. See Table 11 below. 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 the ► 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 _______________________________________________________________________ Multiple alarms can be active at the same time; the alarm that was triggered first will be shown on the display. The next active alarm is 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.
Chapter 4 _________________________________________________________________ Operation 0802-070 Figure 47 6. 7. 8. Modifying an Alarm Limit 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.
User's Guide _______________________________________________________________________ Example (view current display alarm settings): >alsel ? Al1 Tdf Al1 Tdf Al1 Tdf Al1 Tdf Al2 T Al2 T Al2 T Al2 T > Table 13 Name above below hyst enabl above: below: hyst : enabl: above: below: hyst : enabl: 0.00 'C 1.00 'C ON 40.00 'C 1.00 'C ON ALSEL Parameters Description If specified, the alarm goes off when the quantity value rises above 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 USBRJ45 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. 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 48 on page 76. 3.
User's Guide _______________________________________________________________________ LAN Communication To enable LAN communication, a LAN or WLAN interface must be physically connected to the network, and the networking settings must be suitable for your network. For a description of interfaces, see sections LAN Interface on page 58 and WLAN Interface on page 59. The LAN and WLAN interfaces both operate by accessing the serial interface (User Port) of the transmitter.
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. NET [REFRESH] [DISCONNECT] [DHCP WEB] [DHCP IP SUBNET GATEWAY WEB] where REFRESH = DISCONNECT = DHCP = WEB = IP = SUBNET = GATEWAY = Updates the network information and displays it.
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 17.
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 52 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 55 Web Configuration Interface for WLAN Terminal Program Settings The instructions below describe how to connect to the transmitter 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 transmitter 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 20 Data Recording Commands Command DIR PLAY [0 ...
User's Guide _______________________________________________________________________ Table 26 Command ? ?? ALSEL CON CDATE CODE CTEXT DATE DSEND ECHO ERRS FIND HELP LIGHT LOCK MODBUS MODS PRES RESET TEST TIME UNIT VERS XPRES MOL/MOLI Other Commands Description Output the information about the device Output the information about the device in POLL-state Set display alarms Set display contrast Display the output date/set date when adjustment enabled Display the order configuration code of the transmitter Di
Chapter 4 _________________________________________________________________ Operation Getting Measurement Message from Serial Line Starting Continuous Outputting R Enter the R command to start the continuous output of measurements. Example: >r Tdf=-20.6 'C H2O= >r Tdf=-20.7 'C H2O= > 958 ppmV x= 0.6 g/kg 958 ppmV T= 23.8 'C RH= 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 98. 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 >send w 0 Tdf= 'C > : ON 0.6 'C x= 4.0 g/kg SSR= 22.5 % Ts= 23.2 where the state of the probe is indicated by the following letters and values: w...xxx = Sensor warming where xxx H...xxx = Purge S...xxx = Sensor cooling after purge A...
User's Guide _______________________________________________________________________ 2. 3. 4. 5. NOTE 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. Press EXIT to return to the basic display.
Chapter 4 _________________________________________________________________ Operation Table 27 FORM Command Modifiers Modifier x.y #t #r #n "" #xxx Description Length modifier (number of digits and decimal places) Tabulator Carriage-return Line feed String constant Special character, code "xxx" (decimal), for example #027 for ESC Unit field and length (length optional) Transmitter address [00...255] Error flags for P, T, Ta, RH [0000 ...
User's Guide _______________________________________________________________________ UNIT Use the UNIT command to select metric or non-metric output units, and change the unit for the H2O quantity: UNIT [x] where x = Unit system to be used. Options are: M (metric units) N (non-metric units) UNIT H2O [y] where y NOTE = Unit to be used for H20.
Chapter 4 _________________________________________________________________ Operation NOTE Pressure compensation is intended to be used in normal air only. When measuring in other gases, please contact Vaisala for further information. NOTE Fixed pressure compensation value of 1013.25 hPa is used when in adjustment mode. Using Display/Keypad Use display/keypad to set the pressure compensation. To select the pressure unit using display/keypad see section Changing Quantities and Units on page 97. 1. 2. 3.
User's Guide _______________________________________________________________________ Press the set button (Pset) to set the pressure value. The number of presses equals the number of bara to be set (for example, three presses = three bara). After a few seconds, the red LED will confirm the setting by flashing the new pressure value. Using Serial Line XPRES and PRES Command XPRES must be used if the value is changed frequently (for example, by an automatic system that updates the value).
Chapter 4 _________________________________________________________________ Operation Date and Time Using Display/Keypad If the optional Data Logger Module is installed, you can change the time and date using the display/keypad. 1. 2. 3. 4. 5. 6. Press any of the arrow buttons to open the Main Menu. Select System and press the ► arrow button to confirm your selection. Select Date and time and press the ► arrow button.
User's Guide _______________________________________________________________________ Data Filtering The averaging data filter calculates a average over a certain period of time. The lowest measurement noise is achieved with the extended filtering. There are three filtering levels available. Table 29 Setting OFF STANDARD EXTENDED Filtering Levels Filtering Level No filtering. Standard filtering, enabled by default. Approximately 13 s moving average. Extended filtering.
Chapter 4 _________________________________________________________________ Operation 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.
User's Guide _______________________________________________________________________ Device Information Use the display/keypad or the serial line to display the device information.
Chapter 4 _________________________________________________________________ Operation 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 : > D1120014 D0750009 2008-08-16 Helsinki / FIN 2000-01-02 05:12:27 STOP 19200 N 8 1 10 s 0 ON 1013.25 hPa OFF 0...1V 0...1V -20.
User's Guide _______________________________________________________________________ HELP Use the HELP command to list the currently available commands. The available commands are determined by the device configuration and installed options.
Chapter 4 _________________________________________________________________ Operation VERS Use the VERS command to display software version information. Example: >vers DMT340 / 5.10 > Resetting the Device Use the serial line to reset the device. Use the RESET command to reset the device. The user port switches to start-up output mode selected with command SMODE.
User's Guide _______________________________________________________________________ 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. NOTE If a communication module (LAN, WLAN, or RS-422/RS-485 interface) has been installed, the user port is not accessible.
Chapter 4 _________________________________________________________________ Operation Using Serial Line NOTE You can use the serial commands to change/view the user port settings even if you are currently connected to the service port. SERI Use the SERI command to set the communication settings for the user port. Changed settings will be activated at next reset or power up.
User's Guide _______________________________________________________________________ SMODE Use the SMODE command to set the user port start-up operating mode. SMODE [xxxx] where xxx = STOP, RUN, POLL, or MODBUS. Table 30 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.
Chapter 4 _________________________________________________________________ Operation 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 RUN output interval to zero enables the fastest possible output rate. INTV [xxx yyy] where xxx yyy = Delay, range 0 ... 255. = Unit: S, MIN or H.
User's Guide _______________________________________________________________________ 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.
Chapter 4 _________________________________________________________________ Operation 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 65 for details about graphical display. DIR Use the serial line and issue the DIR command to check the available files.
User's Guide _______________________________________________________________________ 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.
Chapter 4 _________________________________________________________________ Operation Deleting 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. To delete the data files using the keypad/display: 1.
User's Guide _______________________________________________________________________ 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. Changing Output Mode and Range Both output channels have their own dip switch module with 8 switches, see the position in Figure 2 on page 23 (dip switches for analog output settings). 1. 2.
Chapter 4 _________________________________________________________________ Operation 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 ...
User's Guide _______________________________________________________________________ 5. 6. 7. 8. 9. Select Quantity by pressing the ▲▼ arrow buttons. Confirm your selection by pressing CHANGE. Select the quantity by using the arrow buttons. Press SELECT to confirm your selection. Select Scale, lower limit, by pressing the ▲▼arrow buttons. Press SET to confirm your selection. Press OK to confirm your setting. Select the upper limit by pressing the ▲▼arrow buttons.
Chapter 4 _________________________________________________________________ Operation 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. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons. Select System by pressing the ► arrow button. Select Diagnostics by pressing the ► arrow button.
User's Guide _______________________________________________________________________ Analog Output Fault Indication Setting Factory default state for analog outputs during error condition is 0 V/ 0 mA. 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. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons.
Chapter 4 _________________________________________________________________ Operation 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.
User's Guide _______________________________________________________________________ 1102-007 Figure 61 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.
Chapter 4 _________________________________________________________________ Operation Hysteresis Hysteresis function is to prevent the relay switching back and forth when the 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 not released before the value reaches the setpoint increased/decreased by the hysteresis value.
User's Guide _______________________________________________________________________ ONLINE STATUS Live measurement (data available): relay active (C and NO outputs are closed) No live data (for example: error state, chemical purge or adjustment mode): relay released (C and NC outputs are closed) See Figure 62 below for illustrative examples of the FAULT/ONLINE STATUS relay output modes.
Chapter 4 _________________________________________________________________ Operation Table 31 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
User's Guide _______________________________________________________________________ 0706-029 Figure 63 Relay Availability Arrow in Figure 63 above shows where enabled relays are listed on the display. Activation state shown in black. Disabled relays are not shown. Use the display/keypad to set the relay outputs. 1. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons. 2. Select Interfaces, confirm by pressing the ►arrow button. 3. Select Relay outputs, confirm by pressing the ►arrow button. 4.
Chapter 4 _________________________________________________________________ Operation Factory setting: All relays disabled. Use the quantity abbreviations presented above. See Table 5 on page 20. Example of window limit switch: Selecting relay 1 to follow dewpoint measurement and relay 2 to follow sensor temperature measurement. Two relay setpoints are set for both relays.
User's Guide _______________________________________________________________________ Testing Operation of Relays Testing activates relays even if they are disabled. Use the module push buttons to activate the relays. Press the REL 1 or REL 2 button to activate the corresponding relay. Use the display/keydpad to test the operation of relays. 1. 2. 3. 4. 5. 6. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons. Select System, press the ► arrow button. Select Diagnostics, press the ► arrow button.
Chapter 4 _________________________________________________________________ Operation Sensor Functions AutoCal To obtain the best possible accuracy in measurements taken in dry environments, DMT345 and DMT346 have a built-in AutoCal feature. During the AutoCal, the transmitter 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.
User's Guide _______________________________________________________________________ 4. Press START to start AutoCal. If the AutoCal conditions are not fulfilled, a note appears on the display informing that the calibration cannot be made. 0706-014 Figure 64 5. Following AutoCal on the Display Press EXIT to return to the basic display. You can also activate Manual AutoCal by pressing both AUTOCAL buttons on the transmitter motherboard.
Chapter 4 _________________________________________________________________ Operation 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. 1103-067 Figure 65 4. Sensor Purge Settings - Start the sensor purge manually by selecting Start purge now and pressing START. - Select Purge on power-up by using the arrow buttons.
User's Guide _______________________________________________________________________ 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.
Chapter 4 _________________________________________________________________ Operation 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 ? 60 s ? 240 s ? 180 '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.
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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 DMT345/346 transmitters can be accessed using the Modbus serial communication protocol. Support for Modbus protocol is available on all DMT345/346 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 transmitter, 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 68 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 69 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 8. 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 DMT345/346 has diagnostic counters that can be used to pinpoint Modbus problems. The counters are always active when the Modbus protocol is enabled.
User's Guide _______________________________________________________________________ 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 This chapter provides information that is needed in basic maintenance of the product. Possible error states and situations, their probable causes and remedies are described in this chapter. This chapter also contains contact information for Vaisala Technical Support. Periodic Maintenance Cleaning Clean the transmitter enclosure with a soft, lint-free cloth moistened with mild detergent.
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 122). - Serial port outputs stars "***" instead of measurement data. - Display shows "----" instead of measurement data.
Chapter 6 _______________________________________________________________ Maintenance Table 33 Error Messages Error Code Error Message E0 Humidity sensor measurement malfunction. E1 Humidity sensor short circuit E2 E3 E4 E5 Humidity sensor open circuit Temperature sensor open circuit. Temperature sensor short circuit. Temperature measurement malfunction E6 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 This chapter provides you with instructions on how to calibrate and adjust Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346. Calibration DMT345 and DMT346 are fully calibrated and adjusted as shipped from the factory. The typical calibration interval is one year.
User's Guide _______________________________________________________________________ Opening and Closing Adjustment Mode Open the transmitter cover. The buttons needed in the adjustment are on the left-hand side of the motherboard, see Figure 2 on page 23. Press the ADJ button to enable the adjustment mode. The indicator LED indicates the adjustment availability.
Chapter 7 ___________________________________________________ Calibration and Adjustment Adjustment Information Adjustment information is shown on the device information screens; see section Device Information on page 106. 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 _______________________________________________________________________ Two-Point Relative Humidity Adjustment Using Display/Keypad NOTE Reference humidities must be ~0 %RH and 30 ... 75 %RH. A suitable product for the two point RH calibration is for example the Vaisala Humidity Calibrator HMK15. 1. 2. 3. 4. Press the ADJ button (see Figure 2 on page 23) to open the ADJUSTMENT MENU: Select Adjust Td measurement, press ► button. Select 2-point RH adjustment, press START.
Chapter 7 ___________________________________________________ Calibration and Adjustment 7. 8. Press YES to confirm the adjustment. Press OK to return to the adjustment menu. Before closing the adjustment mode, feed the adjustment information into the device, see section Adjustment Information on page 151. Press EXIT to close the adjustment mode and return to the basic display. Using Serial Line NOTE Reference humidities must be ~0 %RH and 30 ... 75 %RH.
User's Guide _______________________________________________________________________ 11. When stabilized, type the high end reference value after the question mark and press Enter. >fcrh RH : 11.25 Ref1 ? c RH : 11.24 Ref1 ? c RH : 11.24 Ref1 ? 11.3 Press any key when ready ... RH RH RH RH OK > 12. 13. 14. : : : : 75.45 75.57 75.55 75.59 Ref2 Ref2 Ref2 Ref2 ? ? ? ? c c c 75.5 The OK indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored.
Chapter 7 ___________________________________________________ Calibration and Adjustment One-Point Dewpoint Adjustment One-Point Dewpoint Adjustment Using Display/Keypad NOTE This is a highly critical adjustment, to be performed only in laboratory conditions. Preferably use the display/keypad interface to perform one-point dewpoint Td/f adjustment. Before proceeding with the Td/f adjustment you must perform the RH adjustment.
User's Guide _______________________________________________________________________ 5. 6. Enter the actual reference frostpoint temperature. The transmitter performs Td/f adjustment. This may take up to six (6) minutes. 0706-026 Figure 77 7. NOTE Completing T d/f Adjustment The adjustment is now completed. Several AutoCals can be necessary after this adjustment has been performed until the transmitter reaches full accuracy. One-point Dewpoint Adjustment Using Serial Line 1. 2. 3.
Chapter 7 ___________________________________________________ Calibration and Adjustment Adjusting Temperature NOTE Temperature adjustment in process conditions is possible only with DMT345. Temperature adjustment of DMT346 cannot be performed in process conditions as the DMT346 measures a cooled temperature whereas the reference instrument measures the actual process temperature. Adjusting Temperature Using Display/Keypad Use preferably the display/keypad to adjust the temperature. 1. 2. 3. 4. 5. 6. 7.
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. Type CT 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 the transmitter 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. 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 This chapter provides the technical data of the product. Specifications Performance Table 35 Dewpoint Specifications DMT345 Property Sensor Measurement range Accuracy Response time 63% [90%] flow rate 1l/min and 1 bar pressure from dry to wet from wet to dry including autocalibration Value Vaisala DRYCAP®180S -40 ... +100 °C (-40 … +212 °F) Td ±2 °C (±3.
User's Guide _______________________________________________________________________ Table 36 Temperature Specifications DMT345 Property Measurement range with sensor warming Accuracy Temperature sensor Table 37 Relative Humidity Specifications DMT345 Property Measurement range with sensor warming Accuracy below 10 %RH above 10 %RH Table 38 Value 0 ... 100 %RH 0 ... 80 %RH ±10 % of reading ±1.5 %RH + 1.
Chapter 8 _____________________________________________________________ Technical Data 0604-022 Figure 79 Dewpoint Measurement Accuracy Graph DMT346 Table 40 Mixing Ratio Specifications DMT346 Property Measurement range (typical) Accuracy Table 41 Value 0 ...
User's Guide _______________________________________________________________________ Table 42 Inputs and Outputs Specifications (Both Models) Property Operating voltage with optional power supply module Default start-up time initial reading after power-up full operation after sensor Purge and AutoCal Power consumption at 20 °C (Uin 24 VDC) Uout 2 × 0 ... 1V / 0 ... 5V / 0 ... 10V Iout 2 × 0 ...
Chapter 8 _____________________________________________________________ Technical Data Table 43 Mechanics Specifications (Both Models) Property Cable bushing Conduit fitting User cable connector (optional) Option 1 Option 2 Probe cable diameter Probe tube material Housing material Housing classification Without display With display and keypad Transmitter weight (with probe, cable, and modules) Table 44 Probe Type DMT345 DMT346 Value M20×1.5, for cable diameter 8 ... 11 mm / 0.31 ... 0.
User's Guide _______________________________________________________________________ Technical Specifications of Optional Modules Power Supply Module Operating voltage Connections Bushing Operating temperature Storage temperature UL file number 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) 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 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.
User's Guide _______________________________________________________________________ 92 (3.62) 116 (4.57) 183 (7.
Appendix A ______________________________________________ Example Installation of DMT346 APPENDIX A EXAMPLE INSTALLATION OF DMT346 This Appendix illustrates an example installation of DMT346 transmitter into a process. 0605-045 Figure 82 1. 2. 3. Cooling Set Installation Make a round 89.5 + 0.5 mm hole on the process wall. Weld the tube of the mounting flange tightly on the inner metal plate of the process wall. If the process wall is more than 125 mm thick, a lengthening piece (max.
User's Guide _______________________________________________________________________ 4. NOTE Unfasten the locking screws on the cooling bar so that you can push the probe into the bar. Push the probe deep enough: make sure that the marking hole meets the end of the bar. 5. Lock the probe in place by tightening the locking screws on the bar. Probe and Cooling Set Mounting with Process Shut Down - Complete the entire mounting process as instructed on page 37.
Appendix B _______________________________________________________ Calculation Formulas APPENDIX B CALCULATION FORMULAS This Appendix contains the formulas used for the calculated output quantities. The DMT346 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 ⋅ Pw T (3) Enthalpy: h = (T − 273.15) ⋅ (1.01 + 0.00189 ⋅ x) + 2.5 ⋅ x (4) The water vapor saturation pressure Pws is calculated by using two equations (5 and 6): 3 Θ = T − ∑ CiT i (5) 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 B _______________________________________________________ Calculation Formulas The water vapor pressure is calculated using: Pw = RH ⋅ Pws 100 (7) Parts per million by volume is calculated using: ppmv = 106 ⋅ Pw ( p − Pw ) (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/
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Appendix C _________________________________________________________ Modbus Reference APPENDIX C MODBUS REFERENCE This appendix describes the Modbus functions and data of the transmitter. Function Codes DMT345 and DMT346 support 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 47 below.
Appendix C _________________________________________________________ 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 C _________________________________________________________ Modbus Reference Status Registers (Read-Only) Table 49 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 33 on page 147. 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 C _________________________________________________________ Modbus Reference Diagnostic Sub-Functions DMT345/346 support 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 53 below for details.
User's Guide _______________________________________________________________________ Device Identification Objects DMT345/346 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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