USER'S GUIDE ® Vaisala DRYCAP Dewpoint Transmitters DMT345 and DMT346 M210762EN-A
PUBLISHED BY Vaisala Oyj P.O. Box 26 FIN-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2006 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 9 About This Manual ................................................................... 9 Contents of This Manual ....................................................... 9 Version Information ............................................................. 10 Related Manuals ..............................
User's Guide _______________________________________________________________________ Installation with Flange ........................................................29 DMT346 Probe and Cooling Set Mounting...........................30 Description of the Cooling Set .............................................31 Parts of the Cooling Set .................................................32 General Probe and Cooling Set Mounting Instructions .......33 Probe and Cooling Set Mounting with Process Shut Down ...
_________________________________________________________________________________ Resetting the Device ........................................................... 69 Keypad/Menu Locks............................................................ 69 LOCK ............................................................................. 69 General Settings..................................................................... 70 Changing Quantities and Units ........................................... 70 FORM........
User's Guide _______________________________________________________________________ ECHO .............................................................................98 SMODE ..........................................................................98 INTV ...............................................................................98 ADDR .............................................................................99 OPEN [nn] ......................................................................
_________________________________________________________________________________ CHAPTER 7 TECHNICAL DATA .................................................................................... 127 Specifications ....................................................................... 127 Performance...................................................................... 127 Options and Accessories .................................................... 131 Technical Specifications of Optional Modules ...........
User's Guide _______________________________________________________________________ Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 Figure 53 Figure 54 Figure 55 Figure 56 Figure 57 Figure 58 Basic Display ............................................................................54 Graphical Display......................................................................
_________________________________________________________________________________ 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 Other Commands ..................................................................... 65 Modifiers ................................................................................... 71 Multiplication Factors................................
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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 _______________________________________________________________________ - Chapter 6, Maintenance, 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 and Vaisala Service Centers. - Chapter 7, Technical Data, provides the technical data of the product.
Chapter 1 _________________________________________________________ General Information Safety General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a serious hazard. If you do not read and follow instructions very carefully at this point, there is a risk of injury or even death. CAUTION Caution warns you of a potential hazard.
User's Guide _______________________________________________________________________ ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.
Chapter 1 _________________________________________________________ General Information Trademarks DRYCAP®®is a registered trademark of Vaisala. Microsoft®, Windows®, and Windows NT®are registered trademarks of Microsoft Corporation in the United States and/or other countries. License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.
User's Guide _______________________________________________________________________ Warranty Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold hereunder to be free from defects in workmanship or material during a period of twelve (12) months from the date of delivery save for products for which a special warranty is given.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features and advantages of Vaisala DRYCAP® Dewpoint Transmitter DMT345 and DMT346. Introduction to Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 incorporate the advanced Vaisala DRYCAP® technology, which enables reliable and accurate dewpoint measurement.
User's Guide _______________________________________________________________________ For quantities measured by DMT345, see Table 3 below. For the optional calculated quantities measured by DMT345, see Table 4 below. For quantities measured and calculated by DMT36, see Table 5 below.
Chapter 2 ___________________________________________________________ Product Overview Basic Features and Options DMT345/346 has the following 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 friendly multilingual display option.
User's Guide _______________________________________________________________________ Parts Description Transmitter Body 0604-005 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 Cable gland for optional module Cover screw (4 pcs) Display with keypad (optional) Cover LED 18 ___________________________________________________________________ M210762EN-A
Chapter 2 ___________________________________________________________ Product Overview 0604-006 Figure 2 Inside of Open Transmitter 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 or RS-485 module (optional) Grounding connector Power supply module (optional) Analog output relay module (optional) Dewpoint probe Output isolation module (optional) Adjustment button
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. The probes are available with the following cable lengths: 2 m, 5 m and 10 m.
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 _______________________________________________________________________ Ø7 96 169 0604-008 Figure 4 Standard Mounting 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 0604-009 Figure 5 Mounting with Wall Mounting Kit The following numbers refer to Figure 5 above: 1 2 3 4 = = = = 5 = Plastic mounting plate Mount the plate to wall with 4 screws M6 (not provided) The arched side up Fasten the transmitter to the mounting plate with 4 fixing screws M3 (provided) Holes for wall/junction box mounting 183 6.2 Ø s = 9.5 mm 59 84 104 116 10.5 6.5 8.5 4.
User's Guide _______________________________________________________________________ 0604-011 Figure 7 Mounting with Metal Wall Mounting Plate 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. This side must be up when mounting.
Chapter 3 ________________________________________________________________ Installation 0604-012 Figure 8 Dimensions of Metal Mounting Plate in mm 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. Attach two spring holders to the plastic mounting plate by using the screws provided in the installation kit. 2.
User's Guide _______________________________________________________________________ 0604-013 Figure 9 Mounting with DIN Rail Installation Kit 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 upwards, see Figure 7 on page 24.
Chapter 3 ________________________________________________________________ Installation 0604-015 Figure 11 Horizontal Pole Installation Number refers to Figure 11 above: 1 = Mounting nuts M8 (4 pcs) Mounting Rain Shield with Installation Kit Vaisala order code for the rain shield: 215109.
User's Guide _______________________________________________________________________ Panel Mounting Frame A panel mounting frame with adhesive tape is available as an option (Vaisala order code: 216038). After the DMT346 has been installed through the panel, a frame can be used to finish off the sawed surface of the panel. 1. Mount the transmitter to the panel. 2. The frame is attached to the panel with an adhesive tape attached to the frame. Remove the paper protecting the tape before attaching. 3.
Chapter 3 ________________________________________________________________ Installation DMT345 Probe Mounting 0604-018 Figure 15 DMT345 Probe Dimensions in mm (inches) 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 _______________________________________________________________________ The following numbers refer to Figure 16 on page 29: 1 2 3 4 NOTE = = = = Process or duct wall Flange Sealing ring Probe 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. DMT346 Probe and Cooling Set Mounting 1 2 357 334.5 ø1 22.5 ø13.
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 for Using and Not Using the Cooling Fins Parts of the Cooling Set A 15° 22 flange 104.
Chapter 3 ________________________________________________________________ Installation max. 50 125 8 ø105 welding 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 _______________________________________________________________________ Push the sensor head deep enough: make sure that the marking hole meets the end of the bar. NOTE 5. Lock the sensor head in place by tightening the locking screws on the bar. sealing material (for example, mineral wool) PROCESS (t max = 350 °C) cooling locking screws fins of the probe M4×6 DIN 916 (AISI 316) to be welded ø89.5 + 0.
Chapter 3 ________________________________________________________________ Installation ~45º cooling profile NOTE: Make sure that the cooling profile does not cover the locking screws ø118 ø89.5 + 0.
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 1. Cut back outer sheath to desired length. 2. Cut back screen braiding or screen foil to dimension X (see Figure 25 A above). 3.
User's Guide _______________________________________________________________________ 4. Bend over the screen braiding or screen foil by about 90º (item 4). 5. Push the seal insert with the contact socket of the gland (items 2 & 3) up to the screen braiding or screen foil. 6. Mount lower part (item 5) on the housing 7. Push the seal with the contact socket of the gland and (item 2 & 3) flush into the lower part (item 5). 8. Screw the domed cap nut (item 1) onto the lower part (item 5).
Chapter 3 ________________________________________________________________ Installation Signal and Power Supply Wiring When connecting transmitter with 8-pin connector, see section 8-Pin Connector on page 52. 0605-028 Figure 26 Screw Terminal Block on the Motherboard Numbers refer to Figure 26 above: 1 2 3 WARNING = = = Supply terminals POWER 10 ... 35 VDC = 24 V~ User port (RS-232 terminals) Analog signal terminals Make sure that you connect only de-energized wires.
User's Guide _______________________________________________________________________ 1. Open the transmitter cover by taking out the four cover screws. 2. 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. 3. Connect the analog output cables to terminals: Ch1 +, Ch1-, Ch2+, Ch2-.
Chapter 3 ________________________________________________________________ Installation 0605-029 Figure 27 CAUTION Connections to 24 VAC Power Supply In case you have only one AC supply, never connect same wire to the + connector of a transmitter and to the - connector of another one. This will short-circuit the transformer. Optional Modules Power Supply Module The mains power connection may be connected to the power supply module only by an authorized electrician.
User's Guide _______________________________________________________________________ 0605-030 Figure 28 Power Supply Module Numbers refer to Figure 28 above: 1 2 3 = = = 4 5 = = Connect AC mains voltage wires to these terminals Grounding terminal In case the module is not installed in the factory: Connect wires from these terminals to the POWER 10 ... 35V = 24 V~ terminals of the motherboard. + – Installation 1. Disconnect the power. 2.
Chapter 3 ________________________________________________________________ Installation 5. Connect the AC mains voltage wires to the power supply module terminals marked with N and L. 6. Attach the grounding wire to the grounding terminal on the right-hand side of the transmitter. 7. Connect the power. The LED on the cover of the transmitter is lit continuously during normal operation. WARNING Do not detach the power supply module from the transmitter when the power is on.
User's Guide _______________________________________________________________________ Dit product voldoet aan de eisen van de richtlijn 73/23 EEG (Laagspanningsrichtlijn). - De stroom kan aan de stroomtoevoer module aangesloten worden alleen door een bevoegde monteur. - Het is niet toegestaan de stroomtoevoer module van de transmitter los te koppelen wanneer de stroom aan is.
Chapter 3 ________________________________________________________________ Installation Šis produktas atitinka direktyvą dėl žemos įtampos prietaisų (73/23/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 HMT330 siųstuve, nejunkite jo į elektros tinklą.
User's Guide _______________________________________________________________________ 0605-031 Figure 29 Galvanic Output Isolation Module Alarm Relays DMT346 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 131. Installation and Wiring 1. Disconnect the power. In case the relay-module is installed in the factory, continue with the step 5. 2.
Chapter 3 ________________________________________________________________ Installation Selecting Relay Activation State The middlemost C terminal and either one of the terminals NO/NC shall be connected. The polarity can be freely selected. NO C NC Normally open Common relay Normally closed Relay NOT activated: C and NC outputs are closed, NO is open Relay IS activated: C and NO outputs are closed, NC is open. Connect the power and close the cover.
User's Guide _______________________________________________________________________ WARNING Do not connect the mains power to relay unit without grounding the transmitter. RS-422/485 Interface 0605-033 Figure 31 RS-485 Module Numbers refer to Figure 31 above: 1 2 3 = = = Flat cable pins Selection switches Screw terminals for wiring Installation and Wiring 1. Disconnect the power. In case the RS-485-module is installed in the factory, continue with the item 4. 2.
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) Data pair shield B A RxB RxA Data pair shield TxB TxA 6. If you use RS-485 (or RS-422) to connect just one DMT346 to a master computer, enable the internal termination of DMT346 by switching switches 1 and 2 ON.
User's Guide _______________________________________________________________________ 0605-034 Figure 32 4-Wire RS-485 Bus Connections, Part A Table 7 4-Wire (Switch 3:On) RS-485 master TxA TxB RxA RxB Data → → ← ← DMT346 RxA RxB TxA TxB 50 ___________________________________________________________________ M210762EN-A
Chapter 3 ________________________________________________________________ Installation 0605-035 Figure 33 4-Wire RS-485 Bus Connections, Part B Table 8 2-Wire (Switch 3:Off) RS-485 master A B Data ↔ ↔ DMT346 A B 8. When operating in communication mode RS-422, set both switches 3 and 4 to ON position (4-wire wiring is required for RS-422 mode). 9. Connect the power and close the cover.
User's Guide _______________________________________________________________________ 8-Pin Connector 0511-048 PIN/Terminal Figure 34 Wiring of Optional 8-Pin Connector Table 9 8-Pin Connector Wiring 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) A– (Serial GND) Supply – Supply + B– Cable shield Signal GND (for both channels) Ch 2 + Ch 1 +
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.
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 ... 3 quantities for the numerical basic display (see section Changing Quantities and Units on page 70).
Chapter 4 _________________________________________________________________ Operation Graphic History The graphical display shows the data trend of the selected quantities, one at a time. The graph is updated automatically while measuring. Use the following functions in the graphical display: - Press the NEXT button to have the trend graph and max/min graph in turns. - Press the EXIT button to get back the basic display.
User's Guide _______________________________________________________________________ Table 11 Graph Information Messages Failure Message Power outage No data Device failure T meas. failure RH meas. failure Adj. mode active Autocal Interpretation Power failure (marked also with dashed vertical line) Quantity has not been selected for the display General device failure.
Chapter 4 _________________________________________________________________ Operation 0503-012 Figure 37 Main Views Changing Language Setting 1. Go back to the basic display by keeping the right-hand button pressed for four seconds. 2. Open the MAIN MENU by pressing any of the 3. Select System (the lowest row), press button. 4. Select Language: ... (the third row marked with a flag icon), press SELECT button (left-hand button). 5. Select the language with (left-hand button). 6.
User's Guide _______________________________________________________________________ 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Select Display, press the arrow button. 3. Select Backlight, press the CHANGE button. 4. Select On/Off/ Automatic, press the SELECT button. 5. Press EXIT to return to the basic display. Display Contrast Setting 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Select Display, press the arrow button. 3.
Chapter 4 _________________________________________________________________ Operation 5. Press EXIT to return to the basic display. Returning to the menu is possible only by entering the correct PIN code. When you want to turn off the PIN lock, go to the menu by giving the PIN code and select System, Menu PIN, press OFF button. In case you have forgotten the PIN code, open the transmitter cover and press the ADJ button once. Wait for a few seconds and the adjustment menu opens.
User's Guide _______________________________________________________________________ 1. Connect the connection cable between the serial port of your PC and the Service Port of DMT346, see Figure 38 below. 2. Check that the DMT346 is powered and start using the MI70 Link program. Use a MI70 Link version 1.07, or a newer one, to be able to utilize all the functions of DMT346. Serial Line Communication Connect the serial interface by using either the user port or the service port.
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 _______________________________________________________________________ 3. Open a terminal program and set the communication settings (see the following section for more detailed instructions). Table 13 Fixed Communication Settings for Service Port Parameter Bauds Parity Data bits Stop bits Flow control Value 19200 None 8 1 None Terminal Program Settings The following instructions show a connection example with HyperTerminal program (included in the Microsoft® Windows®).
Chapter 4 _________________________________________________________________ Operation 0503-014 Figure 41 4. Connecting to Hyper Terminal Set the port settings in the "Properties" window to match the settings of your DMT346 user port/service port. For DMT346, "Flow control" must always be set to "None". Finally click OK to start using the serial connection. 0503-015 Figure 42 Hyper Terminal Serial Port Settings 5.
User's Guide _______________________________________________________________________ List of Serial Commands The bold text in the brackets indicates the default setting. Issue commands by typing them on your computer and pressing the Enter key. Table 14 Measurement Commands Command R S INTV [0 ... 255 S/MIN/H] SEND [0 ... 99] SMODE [STOP/RUN/POLL/SEND] SERI [baud p d s] ADDR [0 ... 99] OPEN [0 ...
Chapter 4 _________________________________________________________________ Operation Table 19 Command FCRH AØ1 CT ACAL Table 20 Command ASEL ITEST AMODE AERR ASCL Table 21 Command RSEL RTEST Table 22 Command ? ?? CDATE CODE CTEXT DATE DELETE DSEND ECHO ERRS HELP LOCK MODS PRES RESET TEST TIME UNDELETE UNIT VERS XPRES MOL/MOLI Calibration and Adjustment Commands Description RH 2-point-adjustment Td/f 1-point-adjustment T 1/2-point-adjustment Perform analog output adjustment Setting and Testing the A
User's Guide _______________________________________________________________________ Getting Measurement Message from Serial Line Press R to start output of measurements. Press S, the Esc button or reset the transmitter to stop outputting. See command SMODE to change the default (power-up) operation mode. Format the output by using the following commands: - resulting interval can be changed with the command INTV. - output string format can be changed with the command FORM.
Chapter 4 _________________________________________________________________ Operation 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 _______________________________________________________________________ Example: >send RH= 16.2 %RH T= 22.0 'C >ftime on Form. time : ON >send 00:03:56 RH= 16.2 %RH T= 22.0 'C >fdate on Form. date : ON >send 2000-01-01 00:04:08 RH= 16.2 %RH T= 22.0 'C > FST To output the state of purge, sensor warming and AutoCal in connections with SEND and R commands issue command FST [x]. Syntax: FST [x] where x = ON or OFF (default) Example: >fst on Form. status >send w 0 Tdf= 23.2 'C > : ON 0.
Chapter 4 _________________________________________________________________ Operation Resetting the Device Use the serial line to reset the device. Use the command RESET to reset the device. The user port switches to start-up output mode selected with command SMODE. Keypad/Menu Locks LOCK Use the LOCK [x] command to turn on the menu lock.
User's Guide _______________________________________________________________________ Use the LOCK [x] command to disable the keypad completely. Syntax: LOCK [x] where x = 2 (Keypad disabled) Example: >lock 2 Keyboard lock > NOTE : 2 Open the locks with the serial command LOCK 0. You can open the menu lock also by using the keypad, provided a PIN code has been set. See section General Settings below for a description of the other serial commands.
Chapter 4 _________________________________________________________________ Operation 4. Select the quantity by using the ▲▼ arrow buttons. Confirm the selection by pressing SELECT. You can select 1 ... 3 display quantities at a time. 5. Press EXIT to return to the basic display. To select display units: NOTE 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Press the ► arrow button to select Display. 3. Use the ▲▼arrow buttons to select Units.
User's Guide _______________________________________________________________________ Modifier Description #027 for ESC Unit field and length Transmitter address with two characters [00...99] 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.
Chapter 4 _________________________________________________________________ Operation NOTE This command changes both the serial output and display units to either metric or non-metric units. When you want to output both metric and non-metric units simultaneously on the display, select the display units by using the display/keypad. Pressure Compensation Setting The pressure has an effect on humidity calculations and accuracy.
User's Guide _______________________________________________________________________ Using Buttons on Motherboard Pressure set buttons (Pchk and Pset) can be used to set the process pressure. 0504-052 Figure 43 Pressure Set Buttons on Motherboard Numbers refer to Figure 43 above: 1 2 = = Pressure check button Pressure set button Press check button (Pchk) and a red led will flash the current pressure setting in bara. Press the set button (Pset) to set the pressure value.
Chapter 4 _________________________________________________________________ Operation Example: >pres Pressure >pres 1010 Pressure > Table 24 : 1013.00 hPa ? : 1010.00 hPa Multiplication Factors From mbar PaN/m2 mmHg torr inHg mmH2O inH2O atm at bar psia 1) To: hPa 1 0.01 1.333224 33.86388 0.09806650 2.490889 1013.25 980.665 1000 68.94757 1) psia = psi absolute Example: 29.9213 inHg = 29.9213 × 33.86388 hPa = 1013.
User's Guide _______________________________________________________________________ 5. Select RUN interval for RUN communication mode and press SET to confirm your selection. 6. Use the arrow buttons to set the measuring interval and the unit. Press OK to confirm your settings. 7. Select POLL address for POLL communication mode. Press SET to confirm your selection. 8. Use the arrow buttons to set the transmitter address. Press OK to confirm the setting. 9. Use the arrow buttons to select ECHO.
Chapter 4 _________________________________________________________________ Operation Table 25 Selection of Output Modes Mode STOP RUN POLL Output Only by command Automatic output Only with command SEND [addr] SEND One message at power-up Commands used All (default mode) Only command S Use with RS-485 buses, see RS-422/485 Interface on page 48. Selected output mode will be activated after power outages. INTV Use the command INTV[xxx yyy] to set the outputting interval for the RUN mode.
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.
Chapter 4 _________________________________________________________________ Operation Device Information Use the display/keypad or the serial line to display the device information.
User's Guide _______________________________________________________________________ Example: >? DMT340 / 3.01 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 x low : Ch2 x high : Module 1 : Module 2 : > A3220001 A3120029 2005-08-09 Vaisala/HEL 2000-01-01 00:42:41 STOP 4800 E 7 1 0 s 0 ON 1000.00 hPa ON 4...20mA 4...20mA 0.00 'C 100.00 'C 0.
Chapter 4 _________________________________________________________________ Operation >ERRS FAIL Error: Temperature measurement malfunction Error: Humidity sensor open circuit > VERS Use the command VERS to display software version information. Example: >vers DMT346 / 3.01 > Data Recording Data recording function is always on and collects data automatically into the memory of the device. Recorded data do not disappear from the memory when the power is switched off.
User's Guide _______________________________________________________________________ where xxx = Data recording quantity. See Table 5 on page 16 for output available quantities. Issue the command without parameters and press Enter to display current recording parameters. Example: >dsel tdf x Tdf x >dsel Tdf x > 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.
Chapter 4 _________________________________________________________________ Operation Example: >dir 0 Tdf 1 Tdf 2 Tdf 3 Tdf 4 Tdf 5 x 6 x 7 x 8 x 9 x 10 SSR 11 SSR 12 SSR 13 SSR 14 SSR > latest latest latest latest latest latest latest latest latest latest latest latest latest latest latest 3 hours 1 day 10 days 2 months 1 year 3 hours 1 day 10 days 2 months 1 year 3 hours 1 day 10 days 2 months 1 year 99-12-31 99-12-30 99-12-20 99-10-25 98-11-22 99-12-31 99-12-30 99-12-20 99-10-25 98-11-22 99-12-31 99-
User's Guide _______________________________________________________________________ Example: >play 2 SSR latest 1 day Date Time yy-mm-dd hh:mm:ss 99-12-30 21:50:51 99-12-30 22:02:51 99-12-30 22:14:51 99-12-30 22:26:51 99-12-30 22:38:51 99-12-30 22:50:51 99-12-30 23:02:51 99-12-30 23:14:51 99-12-30 23:26:51 99-12-30 23:38:51 99-12-30 23:50:51 99-12-31 00:02:51 99-12-31 00:14:51 99-12-31 00:26:51 99-12-31 00:38:51 99-12-31 00:50:51 > 99-12-30 21:50:51 trend min max % % % 15.32 15.21 15.44 15.39 15.34 15.
Chapter 4 _________________________________________________________________ Operation Deleting Recorded Files Use the keypad/display to delete the recorded files. Note that the transmitter automatically overwrites the old data when the memory gets full, so manual deletion of the recorded files is not necessary. CAUTION 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Select System by pressing the ► arrow button. 3. Select Clear graph memories by pressing the CLEAR button.
User's Guide _______________________________________________________________________ 1. Select the current/voltage output, switch ON either of the switches, 1 or 2. 2. Select the range, switch ON one of the switches from 3 to 7. 0503-045 Figure 45 Current/Voltage Switches of Output Modules Numbers refer to Figure 45 above: NOTE 1 2 = = 3 = Current/voltage selection output switches (from 1 to 2) Current/voltage range selection switches (from 3 to 7) in analog output 1 and 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 _______________________________________________________________________ 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Select Interfaces by pressing the ► arrow button. 3. Select Analog outputs by pressing the ► arrow button. 4. Select Output 1/2/3 by pressing the ► arrow button. 5. Select Quantity by pressing the ▲▼ arrow buttons. Confirm your selection by pressing CHANGE. 6. Select the quantity by using the arrow buttons.
Chapter 4 _________________________________________________________________ Operation Enter always all the quantities for all outputs. For quantities and their abbreviations see Table 5 on page 16. Use the command ASEL [xxx yyy] as shown in the example below when using a device with two analog outputs. Example: >asel Ch1 Tdf Ch1 Tdf Ch2 x Ch2 x > low high low high : : : : -20.00 'C ? 100.00 'C ? 0.00 g/kg ? 500.
User's Guide _______________________________________________________________________ ITEST Use the serial line to test the operation of the analog outputs. Use the command ITEST [aa.aaa bb.bbb] to force the analog outputs to entered values. The set values remain valid until you issue the command ITEST without parameters or reset the transmitter. Syntax: ITEST [aa.aaa bb.bbb] where aa.aaa = Current or voltage value to be set for channel 1 (mA or V) bb.
Chapter 4 _________________________________________________________________ Operation AERR Use the serial line AERR command to change the error output. AERR Example: >aerr Ch1 error out Ch2 error out > : 0.000V ? 5.0 : 0.000V ? 5.0 NOTE The error output value must be within a valid range for the output type. NOTE The error output value is displayed only when there are minor electrical faults such as a humidity sensor damage.
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 FAULT STATUS Normal operation : relay active (C and NO outputs are closed) Not measuring state : relay released (C and NC outputs are closed) (error state or power off) ONLINE STATUS Live measurement : relay active (C and NO outputs are closed) (data available) No live data : relay released (C and NC outputs are closed) (for example, error, AutoCal, purge or adjustment mode) Enabling/Disabling Relays You can deactivate t
User's Guide _______________________________________________________________________ 0605-040 Figure 46 Relay Availability Arrow in Figure 46 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.
Chapter 4 _________________________________________________________________ Operation RSEL Use the serial line to select the quantity, setpoints and hysteresis or enable/disable the relay outputs. Issue the RSEL command. Syntax: RSEL [q1 q2 q3 q4] where q1 = q2 = q3 = q4 quantity for the relay 1 or Fault/Online quantity for the relay 2 or Fault/Online quantity for the relay 3 or Fault/Online quantity for the relay 4 or Fault/Online Factory setting: all relays disabled.
User's Guide _______________________________________________________________________ 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 ts Rel1 FAUL above: Rel1 FAUL below: Rel1 FAUL hyst : Rel1 FAUL enabl: Rel2 Ts above: Rel2 Ts below: Rel2 Ts hyst : Rel2 Ts enabl: > ON ? on 140.00 'C ? 140 80.00 'C ? 80 2.00 'C ? 2 ON ? on Testing Operation of Relays Testing activates relays even if they are disabled.
Chapter 4 _________________________________________________________________ Operation RS-485 Module Operation RS-485 interface enables communication between RS-485 network and DMT346 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.) When selecting an RS-232-RS-485 converters for the network, avoid self powered converters as they don't necessarily support the needed power consumption.
User's Guide _______________________________________________________________________ ECHO Use the ECHO [x] command to enable/disable echo of characters received over the serial line. Syntax: ECHO [x] where x = ON/OFF (default = OFF) When using 2-wire connection, echo must be always disabled. SMODE Use the SMODE [xxxx] command to set the serial interface mode.
Chapter 4 _________________________________________________________________ Operation Sets the RUN mode output interval. The time interval is used only when the RUN mode is active. Example: The output interval is set to 10 minutes >intv 10 min Output intrv. : > 10 min Setting RUN output interval to zero enables the fastest possible output rate. ADDR Addresses are required only for POLL mode (see serial line command SMODE on page 98). Use the ADDR [aa] command to input the RS485 transmitter address.
User's Guide _______________________________________________________________________ CLOSE The CLOSE command switches the transmitter back to the POLL mode. Example: >OPEN 2 (opens the line to transmitter 2, other transmitters stay in POLL mode) >CRH(for example, calibration performed) ... >CLOSE (line closed) SDELAY With the sdelay command you can set delay (response time) for user port (RS-232 or RS-485), or view currently set delay value. Value corresponds to tens of milliseconds (eg. 5 = 0.
Chapter 4 _________________________________________________________________ Operation The AutoCal is carried out if the following criteria for the measurement environment are fulfilled: - Relative humidity must be <10 %. - Temperature must be 0
User's Guide _______________________________________________________________________ 0504-049 Figure 47 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. These are the same buttons as the pressure set buttons, but when pressed simultaneously, they will start the AutoCal procedure. See Figure 43 on page 74 for location of the AUTOCAL/pressure set buttons.
Chapter 4 _________________________________________________________________ Operation Manual Sensor Purge The 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. 1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow buttons. 2. Select Measuring, press the ►arrow button. 3. Select Purge, press the ►arrow button. 4. Select Manual Purge using the arrow buttons.
User's Guide _______________________________________________________________________ 0504-051 Figure 49 Activating Start-up Purge 1. Press ON to activate Start-up Purge. Pressing OFF disables the function. 2. Press EXIT to return to the basic display. PUR With the PUR command you can enable or disable interval and power-up Purge and set the interval for interval purge. The default purge interval is 24 hours. It is not recommended to change these settings. Type PUR and press Enter to proceed.
Chapter 4 _________________________________________________________________ Operation PURGE Use the command PURGE to start the manual Purge. Issue command PURGE to start Purge immediately. 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 values measured before purge until the settling time is over.
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Chapter 5 ___________________________________________________ Calibration and Adjustment CHAPTER 5 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 _______________________________________________________________________ The following adjustments are possible: - Two-point relative humidity adjustment - One-point dewpoint adjustment - One-point temperature adjustment - Two-point temperature adjustment - Analog output adjustment 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 19 above.
Chapter 5 ___________________________________________________ Calibration and Adjustment Adjustment Information These data are shown on the device information. (see section Device Information on page 79. Use the display/keypad to feed the adjustment information. 1. If you are not in the adjustment menu, press the ADJ button on the motherboard to open the ADJUSTMENT MENU. 2. Press the ► arrow button to select Adjustment info. 3. Select Date, press SET. Enter the date by using the arrow buttons.
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. Press the ADJ button (see Figure 2 on page 19) to open the ADJUSTMENT MENU): 2. Select Adjust Td measurement, press button. 0605-041 3. Select 2-point RH adjustment, press START.
Chapter 5 ___________________________________________________ Calibration and Adjustment 0605-048 Now proceed to the adjustment at the wet end reference condition (30 ... 75 %RH) and carry out the procedure as described in the previous items. 7. Answer YES to confirm the adjustment. Press OK to return to the adjustment menu. 8. Before closing the adjustment mode, feed the adjustment information into the device, see section Adjustment Information on page 109.
User's Guide _______________________________________________________________________ >fcrh RH : 11.25 Ref1 ? RH : 11.25 Ref1 ? RH : 11.25 Ref1 ? RH : 11.24 Ref1 ? RH : 11.24 Ref1 ? 11.3 Press any key when ready ... 9. Now the device is waiting for the wet end reference. Insert the probe in the wet end reference condition (30 ... 75 %RH). Press any key when ready. 10. Let the probe stabilize for about 30 minutes. You can follow the stabilization by pressing Enter. 11.
Chapter 5 ___________________________________________________ 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 _______________________________________________________________________ 0605-019 Figure 51 Proceeding with T d/f Adjustment 5. Enter the actual reference frostpoint temperature. 6. The transmitter performs Td/f adjustment. This may take up to six (6) minutes. 0605-020 Figure 52 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.
Chapter 5 ___________________________________________________ Calibration and Adjustment Example: >a01 Tf : -34.25 'C Ref ? -33 Wait for Purge data...OK > 4. NOTE Press the ADJ button on the motherboard inside the transmitter to disable adjustments. Several AutoCals can be necessary after this adjustment has been performed until the transmitter reaches full accuracy.
User's Guide _______________________________________________________________________ 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.
Chapter 5 ___________________________________________________ Calibration and Adjustment Adjusting Temperature Using Serial Line CT Use the serial line command CT to adjust the temperature. 1. Press the ADJ button on the motherboard to open the adjustment mode. 2. Remove the probe filter and insert the probe head into the reference temperature. 3. Type CT and press Enter. Type C and press Enter to check if the reading is stabilized. 4.
User's Guide _______________________________________________________________________ Adjusting Analog Outputs In the analog output calibration the analog output is forced to the following values: current output = 2 mA and 18 mA voltage output = 10 % and 90 % of the range Connect DMT346 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.
Chapter 5 ___________________________________________________ Calibration and Adjustment 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 I1 Ch1 I2 Ch2 I1 Ch2 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.
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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 and Vaisala Service Centers.
User's Guide _______________________________________________________________________ Error States In error state the quantity is 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 90) - the serial port outputs stars (***) - the cover LED is blinking - optional display: error indicator is lit.
Chapter 6 _______________________________________________________________ Maintenance Error Message Temperature measurement malfunction Temperature sensor current leak.
User's Guide _______________________________________________________________________ Technical Support For technical questions, contact the Vaisala Technical Support: E-mail helpdesk@vaisala.com Fax +358 9 8949 2790 Return Instructions If the product needs repair, please follow the instructions below to enable us to serve you better. 1. Read the warranty information. 2.
Chapter 6 _______________________________________________________________ Maintenance Vaisala Service Centers Vaisala Service Centers perform calibrations and adjustments as well as repair and spare part services, see contact information below. Vaisala Service Centers offer also extended services, for example accredited calibrations, maintenance contracts and calibration reminder program. Do not hesitate to contact them to get further information.
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Chapter 7 _____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the product. Specifications Performance Table 29 Dewpoint Specifications DMT345 Property Sensor Measurement range Accuracy Description / Value Vaisala DRYCAP®180S -40 ... +100 °C (-40 … +212 °F) Td ±2 °C (±3.
User's Guide _______________________________________________________________________ 0605-043 Figure 54 Dewpoint Measurement Accuracy Graph for Vaisala DRYCAP® Dewpoint Transmitter DMT345 Table 30 Temperature Specifications DMT345 Property Measurement range with sensor warming Accuracy Temperature sensor Table 31 Relative Humidity Specifications DMT345 Property Measurement range with sensor warming Accuracy below 10% RH above 10% RH Table 32 Description / Value 0 ... +180 °C (+32 ...
Chapter 7 _____________________________________________________________ Technical Data Table 33 Dewpoint Specifications DMT346 Property Sensor Measurement range Accuracy Description / Value Vaisala DRYCAP®180S -25 … +100 °C (-13 … +212 °F) Td ±2 °C (±3.
User's Guide _______________________________________________________________________ Table 35 Operating Environment Specifications (Both Models) Property Mechanical durability Probe heads for transmitter body with display Storage temperature range Pressure range for probes Measured gases Description / Value Up to +180 °C (+356 °F) for DMT345 Up to +350 °C (+662 °F) for DMT346 -40 ... +60 °C (-40 ... +140 °F) 0 ... +60 °C (32 … +140 °F) -55 ...
Chapter 7 _____________________________________________________________ Technical Data Table 37 Mechanics Specifications (Both Models) Property Cable bushing Conduit fitting User cable connector (optional) Option 1 Option 2 Probe cable diameter Probe cable lengths Housing material Housing classification Housing weight Description / Value M20×1.5, for cable diameter 8 ... 11 mm / 0.31 ... 0.43" 1/2" NPT M12 series 8-pin (male) With plug (female) with 5 m / 16.4 ft black cable 5.
User's Guide _______________________________________________________________________ Table 40 Relay Module Technical Specifications Description Operating temperature range Operating pressure range Power consumption @24 V Contacts SPDT (change over), for example, Contact arrangement Form C Imax Imax Safety standard for the relay component Storage temperature range 3-pole screw terminal / relay Max wire size Table 41 Specification -40 ... +60 ºC (-40 ... +140 ºF) 500 ... 1300 mmHg max 30 mA 0.
Chapter 7 _____________________________________________________________ Technical Data Dimensions in mm (inches) 0605-044 Figure 56 DMT345/346 Transmitter Body Dimensions VAISALA_______________________________________________________________________ 133
User's Guide _______________________________________________________________________ Spare Parts Table 42 Available Spare Parts Item MODULES Relay module Analog Output Module Isolated RS485 Module Power Supply Module Galvanic Isolation Module FILTERS for DMT345 Sintered Filter AISI 316L for DMP246CS Sintered Filter AISI316L D=20mm TRANSMITTER MOUNTING ACCESSORIES Wall Mounting Kit Installation Kit for Pole or Pipeline Rain Shield with Installation Kit DIN Rail Clips with Installation Plate Panel Mounting
Appendix A ______________________________________________ Example Installation of DMT346 APPENDIX A EXAMPLE INSTALLATION OF DMT346 This Appendix illustrates an example installation of DMT346 transmitter into a process.
User's Guide _______________________________________________________________________ NOTE 1. Make a round 89.5 + 0.5 mm hole on the process wall. 2. 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. 50 mm) can be welded on the mounting tube (for walls thicker than 175 mm, see Figure 23 on page 35). 3. The cooling set is mounted in a vertical position.
Appendix A ______________________________________________ Example Installation of DMT346 Figure 58 Insulation with Mineral Wool VAISALA_______________________________________________________________________ 137
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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.
User's Guide _______________________________________________________________________ Mixing ratio: x = 621.99 ⋅ P p-P w (2) w 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 3 ln Pws = ∑ bi Θ i + b4 ln Θ (6) i = −1 where: bi b-1 b0 b1 b2 b3 b4 = = = = = = = coefficients -0.58002206 × 104 0.13914993 × 101 -0.48640239 × 10-1 0.41764768 × 10-4 -0.14452093 × 10-7 6.
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