USER'S GUIDE Vaisala DRYCAP® Dewpoint Transmitter DMT152 M210865EN-F
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www.vaisala.com. © Vaisala 2013 No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 5 About This Manual ................................................................... 5 Contents of This Manual ....................................................... 5 Version Information ............................................................... 6 Related Manuals .............................
User's Guide _______________________________________________________________________ CHAPTER 5 SERIAL LINE OPERATION ......................................................................... 31 Serial Communication ............................................................ 31 Connecting to the Serial Interface ....................................... 31 Installing the Driver for the USB Cable .......................... 31 Terminal Application Settings ..............................................
_________________________________________________________________________________ CHAPTER 7 TROUBLESHOOTING ................................................................................. 59 Typical Problems .................................................................... 59 Unknown Serial Settings ....................................................... 60 Error State ............................................................................... 60 Error Codes .......................................
User's Guide _______________________________________________________________________ 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 Dewpoint Transmitter DMT152................................................. 11 DMT152 Installed Directly to Pipeline.......................................
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the Dewpoint Transmitter DMT152. About This Manual This manual provides information for installing, operating, and maintaining Dewpoint Transmitter DMT152.
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Code M210865EN-F M210865EN-E M210865EN-D Manual Revisions Description June 2013. This manual. Updated the Measured Variables table (accuracy over temperature ranges, non-calibrated ranges). Updated Figure 23 and Figure 24. Added information about NW40 flange. May 2010. Previous version. Applicable from software version 1.21 onwards.
Chapter 1 _________________________________________________________ General Information Safety The Dewpoint Transmitter DMT152 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction. ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits.
User's Guide _______________________________________________________________________ Regulatory Compliances Vaisala DRYCAP® Dewpoint Transmitter DMT152 is in conformity with the following EU directives, including the latest amendments, and with national legislation implementing these directives: - EMC-Directive - RoHS-Directive The conformity is shown by compliance with the following standards: - EN 61326-1: Electrical equipment for measurement, control and laboratory use - EMC requirements – for use in in
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features and advantages of Dewpoint Transmitter DMT152. Introduction to Dewpoint Transmitter DMT152 The Vaisala DRYCAP® dewpoint transmitter DMT152 measures dewpoint temperature accurately in a measurement range from -80 ºC to -10 ºC (-112 … +14 °F). The maximum output range of the transmitter is -100 … +20 °C (-148 … +68 °F).
User's Guide _______________________________________________________________________ Basic Features and Options - Calibrated dewpoint measurement range -80 ... -10 °C Td, output range -100 ... +20 °C Td - Output in Td* and ppm - DRYCAP® polymer sensor with auto-calibration and sensor purge ensures long term stability - Small size to fit in tight installations - Two analog output channels, selectable from 0 … 20 mA / 4 ...
Chapter 2 ___________________________________________________________ Product Overview Transmitter Structure When the transmitter is delivered, the filter is protected by a yellow transport protection cap that keeps the sensor dry. The transport protection cap should be left on the transmitter during storage. Remove the transport protection cap before installing the transmitter. The transmitter body does not have user serviceable parts inside, and is not designed to be opened.
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Chapter 3 _______________________________________________________ Functional Description CHAPTER 3 FUNCTIONAL DESCRIPTION This chapter describes the advanced functionality of Dewpoint Transmitter DMT152, including the auto-calibration, sensor purge, and sensor warming functions. Advanced DRYCAP® Technology Dewpoint Transmitter DMT152 utilizes an advanced, patented measurement technology to ensure accurate measurement with excellent long term stability.
User's Guide _______________________________________________________________________ Sensor Purge Sensor purge is also an automatic procedure that minimizes the drift at the wet end readings of the dewpoint measurement. Sensor purge is performed once a week or when the power is switched on. The sensor is heated for several minutes, which will then evaporate all excess molecules out of the sensor polymer. This, together with the autocalibration, results in a very small drift.
Chapter 4 ________________________________________________________________ Installation CHAPTER 4 INSTALLATION This chapter provides you with information that helps you install the Dewpoint Transmitter DMT152. Selecting the Location It is important that the conditions at the point of installation represent well the gas to be measured. Temperature changes do not affect the dewpoint measurement, but pressure changes will have an effect on the measurement.
User's Guide _______________________________________________________________________ Max 50 bar 0710-101 Figure 2 DMT152 Installed Directly to Pipeline Installing the Transmitter After selecting a suitable measurement location, follow the procedure below to install the transmitter: 1. Remove the yellow transport protection cap from the transmitter. Do not touch the filter with your hands. 0710-128 Figure 3 2. 3.
Chapter 4 ________________________________________________________________ Installation 0710-129 Figure 4 4. CAUTION Installing the Transmitter Use a 30mm wrench to tighten the connection to 25 N m, as shown in Figure 4. If you do not have a 30mm wrench, use a 1 3/16” wrench or an adjustable wrench. Only tighten the probe from the 30mm nut. Do NOT apply force to other points in the probe body. 5. Connect the wires of the connection cable.
User's Guide _______________________________________________________________________ 8. Turn on the power supply. The DMT152 performs self diagnostics at startup, and the output is frozen for several minutes. The transmitter will output an approximated reading after one minute, but accurate measurement will only be available after the startup procedure is complete. Normal operation is typically achieved in 10 … 15 minutes.
Chapter 4 ________________________________________________________________ Installation Wiring Pin 1 2 3 4 Connector I VDC supply+ Signal Ch 1+ GND Signal Ch 2+ / LED Connector II VDC supply+ RS-485 - / B GND RS-485 + / A Wire color Brown White Blue Black 0707-035 Figure 6 Connectors I and II 0707-036 Figure 7 CAUTION Connector Pinout The power supply lines are internally connected. You can use either one of them, but do not connect more than one supply voltage in permanent installations.
User's Guide _______________________________________________________________________ Connection Cables The following connection cable options are available for DMT152: - Unshielded cable with M8 female straight snap-on connector - Shielded cables with M8 female straight threaded connector - Unshielded cable with LED indicator for analog channel 2, 90º angled M8 female threaded connector - USB serial interface cable For the order codes of the cables, refer to section Spare Parts and Accessories on page 66.
Chapter 4 ________________________________________________________________ Installation 0910-135 Figure 9 Cable with Threaded Connector 0809-003 Figure 10 LED Cable 0809-002 Figure 11 USB Serial Interface Cable VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________ Power Supply Requirements The DMT152 transmitters are designed to operate with a supply voltage of 15 ... 28 VDC (voltage output version) or 21 ... 28 VDC (current output version). When only the RS-485 output is used, 11 ... 28 VDC is enough in typical measurement conditions. When measuring in pressures 20 ... 50 bara (290 ... 725 psia) or temperatures -40 ... 0 °C (-40 ... 32 °F), a supply voltage of 21 ...
Chapter 4 ________________________________________________________________ Installation Sampling from a Process Sampling is needed when direct measurement of the air or gas is not possible or desirable. This may be related to, for example, a high process temperature, protecting the sensor from water spikes, the need to easily detach the instrument from a pressurized process without running the whole process down, or wanting to make the measurement at a more convenient location.
User's Guide _______________________________________________________________________ Sampling Accessories DMT242SC Sampling Cell The DMT242SC is a basic sampling cell with only the main sampling cell body. The inlet and outlet are female threaded sample connectors (inlet G3/8", outlet G1/4" ISO). Refer to Figure 12 on page 24.
Chapter 4 ________________________________________________________________ Installation DSC74 Sampling Cell with Quick Connector and Leak Screw The DSC74 has been designed especially for compressed air lines. The sampling cell contains an adjustable leak screw that allows keeping up the pipeline pressure at the sensor. The leak screw is opened and closed with a screwdriver. The leak screw should be 1/2 turn open. This can be verified by first closing the leak screw, then turning 1/2 turn to open it.
User's Guide _______________________________________________________________________ DSC74B Two Pressure Sampling Cell The DSC74B and DSC74C sampling cells are enhanced versions of the DSC74. The body is designed in a way that it is possible to measure at both system pressure and atmospheric pressure. The DSC74B limits the flow rate with a fixed leak screw. The flow is optimized for pressures 3 ... 10 barg.
Chapter 4 ________________________________________________________________ Installation 0510-033 Figure 15 Removing the Leak Screw DSC74C Two-Pressure Sampling Cell with Coil The DSC74C with an outlet coil is designed for the most critical measurements at atmospheric pressure. In the DSC74C, the coil is connected to the sampling cell outlet to protect the sensor from ambient humidity disturbing the measurement. The coil can also be used as a cooling coil for sampling from high temperature processes.
User's Guide _______________________________________________________________________ 0510-034 Figure 16 1 2 3 4 = = = = Default Assembly of DSC74C Gas goes in. The coil can also be used here.
Chapter 4 ________________________________________________________________ Installation 0403-113 Figure 17 1 2 3 4 5 = = = = = Alternative Assembly of DSC74C (for Tight Spaces) Gas comes out Coil Thread, max. size 7 mm Gas goes in Valve The thread size cannot exceed 7 mm. Use the provided adapter to avoid damage to the probe.
User's Guide _______________________________________________________________________ NW40 Mounting Flange An NW40 mounting flange (Vaisala order code 225220SP) is available for installations through thin chamber walls or into vacuum processes. The flange is compatible with ISO G1/2" threaded transmitters. NOTE Vaisala does not provide the flange counterpart, only the attachment for DMT152. 0908-085 Figure 18 NW40 Mounting Flange 3.5 1 55 17.8 ISO228 G1/2 33 41.
Chapter 5 ________________________________________________________ Serial Line Operation CHAPTER 5 SERIAL LINE OPERATION This chapter contains instructions for operating the serial interface of the DMT152. Serial Communication Connecting to the Serial Interface The DMT152 can be connected to a PC using the RS-485 line on Port II. You can use, for example, the USB serial interface cable (Vaisala order code 219690).
User's Guide _______________________________________________________________________ 5. The installation has reserved a COM port for the cable. Verify the port number, and the status of the cable, using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu. Windows will recognize each individual cable as a different device, and reserve a new COM port. Remember to use the correct port in the settings of your terminal program.
Chapter 5 ________________________________________________________ Serial Line Operation 5. 6. Click the Open button to open the connection window and start using the serial line. Note: If PuTTY is unable to open the serial port you selected, it will show you an error message instead. If this happens, restart PuTTY and check the settings. You may need to adjust the Local echo setting in the Terminal category to see what you are typing on the serial line.
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.
Chapter 5 ________________________________________________________ Serial Line Operation Device Information and Status Show Device Information The ? command outputs a listing of device information. ? Example: ? DMT152/1.10 Serial number : Batch number : Module number : Sensor number : Cal. date : Cal.
User's Guide _______________________________________________________________________ Show Transmitter Status The STAT command displays the status of the transmitter in four characters. STAT The characters in the output have the following meaning: [sensor purge] - [output frozen] - [settling] - [status] During normal measurement all characters are zeroes. When purge is activated, output frozen, or the transmitter is in the settling period after sensor purge, the corresponding status character is 1.
Chapter 5 ________________________________________________________ Serial Line Operation Configuring Analog Outputs The DMT152 has two analog output channels. These channels can function either as normal measurement channels, or produce an ON/OFF output if the measurement exceeds a given alarm level (limit alarm) or if the measurement reading is frozen (for example, during sensor purge).
User's Guide _______________________________________________________________________ AMODE [c1 c2] where c1 = Channel 1 analog output mode. Available options are: 1 = 0 ... 20 mA 2 = 4 ... 20 mA 4 = 0 ... 5 V 5 = 0 ... 10 V 7 = I alarm (ON/OFF output using current) 8 = U alarm (ON/OFF output using voltage) Modes 1 ...5 are normal measurement modes, where malfunction alarm is always enabled, and limit alarm and purge status alarm are disabled. c2 = Channel 2 analog output mode.
Chapter 5 ________________________________________________________ Serial Line Operation Limit Alarm The limit alarm is activated when the measured quantity goes below the low limit or above the high limit. The alarm can be specified during ordering for a specified parameter, or configured on the serial line using the ALARM command. When ordering a limit alarm, the alarm levels are set as follows: - For current output, an active alarm is indicated by the current being at the maximum of the scale (20 mA).
User's Guide _______________________________________________________________________ Purge Status Alarm The transmitter can temporarily freeze the output when measurement is not possible (for example, during sensor purge). The purge status alarm indicates this state by setting the analog output at a defined level, in the same way as the limit alarm (see page 39). Use the STATUS command to enable/disable the alarm and to define the voltage/current levels (see example below).
Chapter 5 ________________________________________________________ Serial Line Operation Malfunction Alarm If the transmitter is malfunctioning, the channel output is set to a predefined level. This overrides the normal measurement output of the channel. You can specify the level using the AERR command: AERR Example: aerr Ch1 error out Ch2 error out : : 20.000 mA ? 0.000 V ? The current value is shown after the colon ":". To set a new value, enter it after the question mark.
User's Guide _______________________________________________________________________ Configuring Serial Line Operation Set Serial Line Settings Use the SERI command to set the serial line settings. The new settings will be taken into use when the transmitter is reset or powered up. Note that the transmitter will use its default serial line settings if it is in error state; see section Error State on page 60.
Chapter 5 ________________________________________________________ Serial Line Operation Set Transmitter Address To operate in the POLL mode, the transmitter must have an address. If multiple transmitters share the same serial line, each transmitter must have a different address. For a description of the serial interface modes, see section Set Serial Interface Mode on page 45. ADDR [nn] where nn = address (0 ...
User's Guide _______________________________________________________________________ Table 7 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 ASCII code value (decimal) of a special character; for example, #027 for ESC Transmitter address with two characters [00...99] Currently active transmitter errors in a nine bit field: bit0 ... bit8.
Chapter 5 ________________________________________________________ Serial Line Operation Set Serial Interface Mode SMODE [xxx] where xxx = STOP, RUN, or POLL In STOP mode: outputting only when command is issued, any command can be used. In RUN mode: outputting automatically, only command S can be used. In POLL mode: outputting only when command is issued, any command can be used after the line has been opened using the OPEN command.
User's Guide _______________________________________________________________________ Configuring Measurement Parameters Enable or Disable Sensor Purge You can temporarily disable the sensor purge function using the XPUR command. Note that disabling the sensor purge will affect the measurement performance of the transmitter.
Chapter 5 ________________________________________________________ Serial Line Operation The pressure conversion coefficients from other pressure units to bars is given in the table below. Table 8 From PaN/m² mmHg torr inHg mmH2O inH2O atm at psia Pressure Conversion Coefficients To bara 0.00001 0.001333224 0.03386388 0.00009806650 0.002490889 1.01325 0.980665 0.06894757 Example: 29.9213 inHg = 29.9213 × 0.03386388 = 1.
User's Guide _______________________________________________________________________ Set Molar Mass for ppmw Calculation Use the MOL command to view and set the molar mass of the gas in the measurement environment. The molar mass parameter is used in calculating H2O ppmw. Some typical molar masses are: - Air N2 O2 SF6 28.96 g/mol 28.0134 g/mol 32.00 g/mol 146.06 g/mol MOL [n] where n = Molar mass (in g/mol) of the gas in the measurement environment Examples: NOTE mol 146.06 Mol : 146.
Chapter 5 ________________________________________________________ Serial Line Operation Serial Line Output Commands Start Measurement Output Use the R command to start the continuous outputting of measurement values as an ASCII text string to the serial line. The format of the measurement message is set with the FORM command. R Example (measurement message in default format): r Tdf= -2.5 'C H2O= Tdf= -2.5 'C H2O= Tdf= -2.
User's Guide _______________________________________________________________________ Output a Reading Once SEND [aa] where aa = Transmitter address (0 ... 99). Must be specified if the transmitter is in POLL mode, and a line has not been opened using the OPEN command. Example: send Tdf= -2.0 'C H2O= 5152 ppm Troubleshooting and Maintenance Commands Display the Currently Active Errors Use the ERRS command to display the currently active transmitter error codes.
Chapter 5 ________________________________________________________ Serial Line Operation Test Analog Outputs The operation of the analog outputs can be tested with the ATEST command by forcing the output to a given value which can then be measured with calibrated multimeter. The command uses the currently selected analog output types for the channels (voltage or current) so you do not have to specify the unit. Before testing, you can verify the currently set analog output modes using the AMODE command.
User's Guide _______________________________________________________________________ Calibrate Analog Output Use the ACAL command to force the analog outputs to the following values: - Current output: 2 mA and 18 mA - Voltage output: 10 % and 90 % of the range After entering the ACAL command, use a calibrated current/voltage meter to measure the output, and enter the values. Note that the calibration is only valid for the currently selected analog output modes.
Chapter 5 ________________________________________________________ Serial Line Operation Other Commands Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode. OPEN [aa] where aa = address (0 ... 99) Example: open 1 DMT152 1 line opened for operator commands Closing the Connection to a Transmitter in POLL Mode The CLOSE command closes the connection to a transmitter.
User's Guide _______________________________________________________________________ Example: time 12 30 00 12:30:00 time 12:30:05 Reset Transmitter When the RESET command is given, the transmitter will restart as if it had just been powered on. All transmitter settings are retained. The serial line mode of the transmitter will be set to the mode that was set using the SMODE command. As the transmitter starts up, it performs the startup sensor purge and autocalibration before resuming measurement.
Chapter 6 _______________________________________________________________ Maintenance CHAPTER 6 MAINTENANCE This chapter provides information on the maintenance of Dewpoint Transmitter DMT152. Cleaning the Transmitter The body of the transmitter can be cleaned by wiping with a moistened lint-free cloth. Do not immerse the transmitter in liquid and do not use cleaning agents or solvents. Do not attempt to clean the filter or the sensor element. If the filter is contaminated, replace it with a new one.
User's Guide _______________________________________________________________________ 0711-195 Figure 21 Filter Structure where 1 2 3 4 = = = = Vaisala DRYCAP® sensor Spring washer Stainless steel mesh filter (do not touch) Top of the filter Replace the filter as follows: 1. 2. 3. 4. Grip the old filter from the top of the filter body using an 11 mm socket wrench. Turn the filter counterclockwise until it is loose.
Chapter 6 _______________________________________________________________ Maintenance Field Check Using DM70 To check of the accuracy of the DMT152 in the field, you need the following equipment: - A fully charged MI70 indicator (the measurement display that is included in the DM70 package) - A calibrated reference probe that is suitable for the intended measurement environment and dewpoint range.
User's Guide _______________________________________________________________________ 4. 5. 6. 7. 8. 9. 10. 11. Check and adjust the environment settings if prompted. You can change the pressure compensation value (only needed for ppm calculation) and the molar mass of the measurement gas. The pressure must be entered in bara; to enter the value in psia, use the serial line.
Chapter 7 ____________________________________________________________ Troubleshooting CHAPTER 7 TROUBLESHOOTING This chapter describes common problems, their probable causes and remedies, and provides contact information for technical support.
User's Guide _______________________________________________________________________ Unknown Serial Settings If you are not sure what the serial settings of your transmitter are, follow the steps below to view and change them. 1. 2. 3. 4. 5. Make sure there are no other transmitters on the serial line. Provide the transmitter with a 9 V supply voltage. This voltage is enough to start it in the error state. Connect to the serial line using the error state serial line settings 19200 N 8 1.
Chapter 7 ____________________________________________________________ Troubleshooting Error Codes The transmitter has error codes that can be displayed on the serial line using the ERRS command. See section Display the Currently Active Errors on page 50.
User's Guide _______________________________________________________________________ Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com. Provide at least the following supporting information: - Name and model of the product in question. Serial number of the product. Name and location of the installation site. Name and contact information of a technically competent person who can provide further information on the problem.
Chapter 8 _____________________________________________________________ Technical Data CHAPTER 8 TECHNICAL DATA This chapter provides the technical data of Dewpoint Transmitter DMT152. Measured Variables Dewpoint temperature Measurement range Accuracy -80 … -30 °C (-112 … -22 °F) -30 … -10 °C (-22 … +14 °F) Non-calibrated range -80 … -10 °C (-112 … +14 °F) Td ± 2 °C (3.6 °F) Td ± 3 °C (5.
User's Guide _______________________________________________________________________ Operating Environment Temperature Relative humidity Pressure Measured gases Sample flow rate -40 … +70 °C (-40 … +158 °F) 0 … 100 %RH (up to +20 °C / +68 °F) 0 … 50 bar (725 psia) non-corrosive gases no effect on measurement accuracy Outputs Two analog outputs (scalable) Accuracy voltage output current output Typical temperature dependence voltage output current output Digital output 0 … 20 mA 4 … 20 mA 0…5V 0 … 10 V ±
Chapter 8 _____________________________________________________________ Technical Data Housing material Stainless steel mesh filter Mechanical connections option 1 option 2 option 3 option 4 Housing classification Storage temperature range Weight With ISO thread With NPT thread With UNF thread AISI316L and PPS AISI303, filter grade 18 µm ISO G1/2" NPT 1/2" UNF 3/4"-16 UNF 5/8"-18 IP65 (NEMA 4) -40 … +80 °C (-40 … +176 °F) 190 g (6.70 oz) 210 g (7.41 oz) 186 g (6.
User's Guide _______________________________________________________________________ Spare Parts and Accessories Description Connection cable for MI70 indicator USB serial interface cable Sealing ring set ISO (copper, 3 pcs) Sealing ring set UNF (copper, 3 pcs) Stainless steel mesh filter (18 µm) 110 … 240 VAC external power supply NW40 mounting flange Plug Kit (ISO 1/2") Plug Kit (NPT 1/2") Analog/RS-485 output cables 2 m (6,5 ft) cable, M8 snap-on connector 3 m (9.
Chapter 8 _____________________________________________________________ Technical Data Dimensions in mm (inches) 1306-156 Figure 24 DMT152 Dimensions VAISALA ________________________________________________________________________ 67
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