USER'S GUIDE Vaisala DRYCAP® Dewpoint Transmitter DMT143 M211435EN-E
PUBLISHED BY Vaisala Oyj Street address: Mailing address: Phone: Fax: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland P.O. Box 26, FI-00421 Helsinki, Finland +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at www.vaisala.com.
_________________________________________________________________________________ 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 ____________________________________________________________________ Sampling from a Process ...................................................... 26 Sampling Accessories ........................................................... 26 DMT242SC Sampling Cell .................................................. 26 DMT242SC2 Sampling Cell with Swagelok Connectors ..... 26 DSC74 Sampling Cell with Quick Connector and Leak Screw .........................................................................
_________________________________________________________________________________ Configure the Alarm LED .................................................... 56 Show Transmitter Uptime.................................................... 57 Reset Transmitter ................................................................ 57 Restore Factory Settings ..................................................... 57 CHAPTER 6 MAINTENANCE ................................................................................
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 Figure 25 Figure 26 DMT143 Parts – Model with ISO Thread ................................. 11 DMT143 Parts – Model with NPT Thread ................................
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the DMT143. About This Manual This manual provides information for installing, operating, and maintaining DMT143. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the DMT143.
USER'S GUIDE ____________________________________________________________________ Version Information Table 1 Manual Code M211435EN-E M211435EN-D M211435EN-C M211435EN-B M211435EN-A Manual Revisions Description February 2014. This manual. Startup sequence length changed (applicable from software version 1.1.5 onward), updated sensor warming information and instructions related to connecting an MI70 hand-held indicator. June 2013. Updated wiring instructions. January 2013. Previous version.
Chapter 1 _________________________________________________________ General Information Safety The DMT143 delivered to you has been tested 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. CAUTION The transmitter body does not have user serviceable parts inside, and is not designed to be opened. Opening the transmitter will void the warranty.
USER'S GUIDE ____________________________________________________________________ Regulatory Compliances DMT143 is in conformity with the provisions of the following EU directives: - EMC-Directive - RoHS-Directive 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 industrial locations.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the DMT143 transmitter and its features. Introduction to DMT143 Vaisala DRYCAP® Dewpoint Transmitter DMT143 is a small and lightweight dewpoint transmitter suitable for a wide range of OEM applications. The DMT143 is easy to install and the mechanics have been designed for harsh environments requiring protection against dust, dirt and splashed water.
USER'S GUIDE ____________________________________________________________________ Basic Features and Options - - - - Dewpoint measurement range -60 ... +60 °C (-76 ... +140 °F). Dewpoint measurement accuracy up to ±2 °C (±5.4 °F) Td in air or N2. Operating pressure range 0 ... 50 bara (725 psia). Configurable for optimum dewpoint measurement accuracy: - Dewpoint measurement in SF6 or air. - Pressure compensation (fixed pressure setting or live pressure input through RS-485).
Chapter 2 ___________________________________________________________ Product Overview Transmitter Parts NOTE 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.
USER'S GUIDE ____________________________________________________________________ Model with NPT Thread 1202-121 Figure 2 DMT143 Parts – Model with NPT Thread The following numbers refer to Figure 2 above: 1 2 3 4 5 6 7 = = = = = = = Transmitter body. Type label is applied here. Digital output: non-isolated RS-485. Alarm LED. Analog output. 30 mm nut. Connection thread: NPT 1/2". DRYCAP® sensor protected with sintered filter.
Chapter 2 ___________________________________________________________ Product Overview Loop-Powered Display DMT143 can be connected to a loop-powered external LED display. The display provides a reading of the output parameter. The display is powered by the 4 ... 20 mA current signal, so there is no need for an external power supply. Two models are available: - Nokeval 301 - Nokeval 302 (with alarm relays) The display is delivered at its default settings.
USER'S GUIDE ____________________________________________________________________ Connection Cables Vaisala supplies shielded cables with M8 female straight threaded connector. Standard cables are available in four lengths: - 0.3 m (1.0 ft) 3 m (9.8 ft) 5 m (16.4 ft) 10 m (32.8 ft) Heavy duty cables are available in two lengths: - 1.5 m (4.9 ft) - 3 m (9.
Chapter 3 _______________________________________________________ Functional Description CHAPTER 3 FUNCTIONAL DESCRIPTION This chapter describes the advanced functionality of DMT143, including the auto-calibration, sensor purge, and sensor warming functions. DRYCAP® Technology Vaisala DRYCAP® dewpoint measurement technology ensures accurate measurement with excellent long term stability. This results in very low maintenance requirements for the transmitter.
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 day 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.
Chapter 3 _______________________________________________________ Functional Description DMT143 Startup Sequence When the transmitter is powered up, it will perform the sequence (applicable from software version 1.1.5 onward) shown in Figure 4 below. After a two-second startup, the transmitter will measure normally for forty seconds, after which it will perform the sensor purge and autocalibration functions.
USER'S GUIDE ____________________________________________________________________ Alarm LED The alarm LED at the back of the transmitter provides a visual indication of the transmitter’s status. The alarm LED functionality is preset at the factory according to order form. You can configure it as follows: - You can change the alarm limit using the DM70 hand-held dewpoint meter. See section Operation with DM70 Hand-Held on page 34.
Chapter 4 ________________________________________________________________ Installation CHAPTER 4 INSTALLATION This chapter provides you with information that is intended to help you install the DMT143. Transmitter Configuration Before Installation You may wish to configure your transmitter before physically installing it. For easy access to the serial line, use the USB service cable and a terminal program on a PC.
USER'S GUIDE ____________________________________________________________________ Selecting the Location It is important that the point of installation represents well the gas to be measured. Temperature changes do not affect the dewpoint measurement, but pressure changes will have an effect on the measurement. All leaks in the system must be eliminated to avoid ambient humidity affecting the measurement.
Chapter 4 ________________________________________________________________ Installation 2. Model with parallel thread (G1/2" ISO 228/1) requires a sealing ring for a tight connection. Use the sealing ring that is provided with the transmitter. Make sure the threads on the mounting point match your transmitter. For the model with NPT thread, do not use a sealing ring. 1202-123 Figure 6 3. Installing the Transmitter with Sealing Ring Tighten the connection by turning with a wrench (max. 50 Nm).
USER'S GUIDE ____________________________________________________________________ Wiring CAUTION 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. Temporary simultaneous use with the USB service cable or DM70 hand-held dewpoint meter (which also provide power) is OK.
Chapter 4 ________________________________________________________________ Installation Power Supply Requirements The minimum supply voltage required by the DMT143 transmitter depends on the analog output type that is used: - For voltage output: 12 ... 28 VDC. - For current output: 18 ... 28 VDC. The maximum load is 500 Ω. The power supply should maintain the voltage for all load conditions. If measuring in pressures above 20 bara (290 psia) or temperatures below 0 °C, the supply voltage must be 24 ...
USER'S GUIDE ____________________________________________________________________ Figure 11 below shows a typical duty cycle during sensor purge at room temperature with 24 VDC supply voltage. Sensor purge current varies with supply voltage and operating temperature. The peak value is the highest in the lowest temperature.
Chapter 4 ________________________________________________________________ Installation Figure 12 below shows a typical duty cycle during auto-calibration at room temperature with 24 VDC supply voltage. Also the auto-calibration current varies with supply voltage and operating temperature.
USER'S GUIDE ____________________________________________________________________ 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.
Chapter 4 ________________________________________________________________ Installation The Swagelok connectors of DMT242SC2 easily connect to a cooling coil or tubing providing the essential function of cooling the dry air to ambient temperature before it reaches the sensor.
USER'S GUIDE ____________________________________________________________________ When using the DSC74, seal the threads of the quick connector or thread adapter carefully with PTFE thread seal tape. Tighten with an open-end wrench.
Chapter 4 ________________________________________________________________ Installation In the basic operation of the DSC74B, the gas flows to the sensor from the front and the outlet is on the side. To have the measurement done at atmospheric pressure, the inlet and outlet are reversed. Then the reducing parts supplied (G3/8" - G1/2" or G3/8" - G1/4") on the outlet side help to protect the sensor from ambient humidity coming in.
USER'S GUIDE ____________________________________________________________________ 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.
Chapter 4 ________________________________________________________________ Installation 0403-113 Figure 18 Alternative Assembly of DSC74C (for Tight Spaces) where 1 2 3 4 5 = = = = = 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 transmitter.
USER'S GUIDE ____________________________________________________________________ DM240FA Duct Installation Flange DMT143 transmitter with the G1/2” ISO228/1 connection thread be installed directly in the process wall through DM240FA duct installation flange. When the transmitter is installed directly on the process wall or pipe, note that a closing valve may be needed on both sides of the installed transmitter so that the sensor head can be removed from the process for calibration or maintenance.
Chapter 5 _________________________________________________________________ Operation CHAPTER 5 OPERATION This chapter contains information that is needed to operate the DMT143. Transmitter Start-Up When the transmitter is connected to power supply (for instructions on selecting the correct operating voltage, see section Power Supply Requirements on page 23), there is a delay of two seconds as the transmitter starts up.
USER'S GUIDE ____________________________________________________________________ Operation with DM70 Hand-Held Dewpoint Meter You can connect the DMT143 to the MI70 indicator (the measurement display that is included in the DM70 package) using the MI70 connection cable (order code 219980SP). This allows you to view and use the measurement data with the MI70 indicator. You can, for example, perform a field check of the measurement accuracy.
Chapter 5 _________________________________________________________________ Operation NOTE You can also return the DMT143 to its factory configuration by using the Factory settings option in the Settings menu. This option is equivalent to using the FRESTORE command on the serial line. Note that also the MI70 indicator will revert to its factory configuration when using the Factory settings option on the MI70.
USER'S GUIDE ____________________________________________________________________ Terminal Application Settings The serial interface settings of the DMT143 RS-485 line are presented in Table 6 below. Table 6 Property Baud rate Parity Data bits Stop bits Flow control Default Serial Interface Settings Description / Value 19200 None 8 1 None The steps below describe how to connect to the DMT143 using the PuTTY terminal application for Windows (available for download at www.vaisala.
Chapter 5 _________________________________________________________________ Operation 0807-004 Figure 21 PuTTY Terminal Application VAISALA ________________________________________________________________________ 37
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 _________________________________________________________________ Operation Device Information Show Device Information The ? command outputs a listing of device information. ? Command ?? is a similar command that is designed to be used if the transmitter is in POLL mode but its address is unknown. The transmitter will respond to the ?? command even while in POLL mode. Do not use the ?? command if you have more than one transmitter on an RS-485 line. Example: ? DMT143 1.0.
USER'S GUIDE ____________________________________________________________________ Show Firmware Version VERS Example: vers DMT143 1.0.2 Show Firmware Information SYSTEM Example: system Device Name Copyright rights reserved. SW Name SW date SW version : DMT143 : Copyright (c) Vaisala Oyj 2012. All : DMT143 : 2012-05-10 : 1.0.2 Show Currently Active Errors Use the ERRS command to display the currently active transmitter error messages.
Chapter 5 _________________________________________________________________ Operation Show Command List Use the HELP command to show a list serial commands: HELP Example: help ? ADDR AERR ALARM AMODE AOVER AOUT ASEL ATEST CLOSE ERRS FILT FORM FRESTORE GAS HELP INTV L LI OPEN PRES R RESET SDELAY SEND SERI SMODE SNUM SYSTEM TIME UNIT VERS XPRES VAISALA ________________________________________________________________________ 41
USER'S GUIDE ____________________________________________________________________ Configuring Analog Output Set Analog Output Parameters and Scaling Use the ASEL command to show or set the output parameter and the scaling of the analog output. ASEL [parameter] [lowlimit highlimit] where parameter = Parameter that is output on analog channel. Available parameters are TDF, TDFA, H2O.
Chapter 5 _________________________________________________________________ Operation Set Analog Output Error Notification If the transmitter is malfunctioning, the analog output is set to a specified level. This overrides the normal measurement output of the channel. The default level is 0 mA or 0V, according to the output type. You can set the level using the AERR command. AERR [level] where level = Error level for the analog output channel.
USER'S GUIDE ____________________________________________________________________ Extend Analog Output Range Use the AOVER command to allow the analog output channels to exceed their specified range by 10%. The scaling of the parameter remains as before; the extra range is used for additional measurement range in the high end of the scale. AOVER [ON/OFF] Example (turning AOVER on): aover on AOVER : ON The following example illustrates how the analog output is affected.
Chapter 5 _________________________________________________________________ Operation Enable or Disable Analog Output Use the AOUT command to enable or disable the analog output channel. AOUT [ON/OFF] Example (turn analog output off): aout off AOUT : OFF 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.
USER'S GUIDE ____________________________________________________________________ Set Output Interval Use the INTV command to change the output interval of the automatically repeating measurement messages. The measurement messages are repeated in the RUN mode, or after the R command has been given. INTV [n xxx] where n xxx = = time interval, range 0 ...
Chapter 5 _________________________________________________________________ Operation Configuring Measurement Parameters Set Measurement Output Format Use the serial line command FORM to change the measurement message sent by the transmitter. You can freely define the output message to include the desired parameters, formatting options, text strings, and additional fields. FORM [modifier string] where modifier string = String of parameters and modifiers that defines the output format, length 1 ...
USER'S GUIDE ____________________________________________________________________ Table 8 FORM Command Parameters Measured Parameter Dewpoint/frost point temperature Dewpoint/frost point temperature, converted to atmospheric pressure ppm moisture, by volume Relative humidity* Abbreviation in FORM Command Tdf Tdfa H20 RH * RH is available only if transmitter has been ordered from Vaisala with a relative humidity output on the analog channel. Table 9 Modifier x.
Chapter 5 _________________________________________________________________ Operation Set Measured Gas Type Use the GAS command to set the type of gas that is measured. GAS [type] where type = Measured gas type. Options are: 0 = air 1 = SF6 Example (change currently measured gas from air to SF6): gas Gas : 0 ? 1 Set Measurement Filtering Use the FILT command to view or set the speed at which the latest measurement result is integrated into the output readings.
USER'S GUIDE ____________________________________________________________________ Set Pressure Compensation Value The pressure of the measured system must be known for accurate dewpoint and ppm measurement. The pressure compensation value has been set at the factory according to the order form. You can view and set a new value using the PRES command. Command XPRES should be used if the value is changed frequently.
Chapter 5 _________________________________________________________________ Operation Select Unit Use the UNIT command to select metric or non-metric output units. UNIT [x] where x = Selects the unit type to output: m = metric units, for example, Celsius n = nonmetric units, for example, Fahrenheit Example: unit m Units : Metric View User Adjustment Parameters Use the L command to view the current user adjustment parameters that are affected by the LI command and the MI70 (Tdf offset only).
USER'S GUIDE ____________________________________________________________________ Set User Adjustment Parameters Use the LI command to set the user adjustment parameters directly. This command is useful for restoring the desired adjustments, and removing the effects of user adjustment without having to perform the factory reset. CAUTION This command is provided primarily for applying an offset to the Tdf measurement.
Chapter 5 _________________________________________________________________ Operation Configuring Serial Line Operation Set Serial Line Operating Mode Use the SMODE command to set the start-up operating mode of the serial line. SMODE [mode] where mode = STOP, RUN, or POLL. Table 11 Mode STOP RUN POLL Selection of Output Modes Measurement Output Only with the SEND command. Automatic output. Only with the SEND [addr] command. Available Commands All (default mode). Only command S.
USER'S GUIDE ____________________________________________________________________ SERI [b p d s] where b p d s = = = = baud rate (4800, 9600, or 19200) parity (n = none, e = even, o = odd) data bits (7 or 8) stop bits (1 or 2) Example (set serial line to 9600 baud, no parity, 7 data bits, and 1 stop bit): seri 9600 e 7 1 SCI Baud P D S: 9600 E 7 1 Set Transmitter Address To operate in the POLL mode, the transmitter must have an address.
Chapter 5 _________________________________________________________________ Operation Set Serial Line Response Time With the SDELAY command you can set delay (response time) of the serial line, or view the currently set delay value. SDELAY [delay] where delay = Serial line delay, range 0 … 255. One unit of delay corresponds to 4 milliseconds.
USER'S GUIDE ____________________________________________________________________ Configure the Alarm LED Use the ALARM command to configure the alarm LED functionality. For more information on the LED, see section Alarm LED on page 18. ALARM [LED] [Alarm] [Level] where LED Alarm Level = Enable or disable the entire LED functionality. Allowed values: ON - Enable the LED functionality. OFF - Turn off the LED completely. = Enable or disable the dewpoint alarm.
Chapter 5 _________________________________________________________________ Operation Show Transmitter Uptime Use the TIME command to show how long the transmitter has been operating since it was last reset or powered up. TIME Example: time Time : 03:14:10 Reset Transmitter Use the RESET command to reset the transmitter. RESET When the RESET command is given, the transmitter will restart as if it had just been powered on. All transmitter settings are retained.
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Chapter 6 _______________________________________________________________ Maintenance CHAPTER 6 MAINTENANCE This chapter provides information that is needed in basic maintenance of the DMT143. Periodic Maintenance Cleaning 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. Calibration DMT143 is fully calibrated as shipped from factory.
USER'S GUIDE ____________________________________________________________________ Changing the Filter Replace the filter if it is contaminated. New filters are available from Vaisala; see section Spare Parts and Accessories on page 72. CAUTION Be careful when changing the filter, since it is easy to break the sensor when the filter is removed.
Chapter 6 _______________________________________________________________ Maintenance Field Check Using the DM70 Hand-Held Dewpoint Meter Vaisala recommends the following equipment for field checking: - 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. The DMP74B probe is recommended for checking the dewpoint and temperature measurement accuracy.
USER'S GUIDE ____________________________________________________________________ 7. The MI70 can display three parameters at one time. To compare the readings of the DMT143 and the reference probe, select the desired parameter from the Display – Quantities and Units menu of the MI70. Select the same parameter from port I and II, and the delta parameter that shows the difference between the two. For example, ∆Td/f shows the difference in dewpoint between the two probes. 1108-039 Figure 23 8. 9. 10.
Chapter 6 _______________________________________________________________ Maintenance Repair Maintenance CAUTION The transmitter body does not have user serviceable parts inside, and is not designed to be opened. Opening the transmitter will void the warranty. If there is a problem with your transmitter that you are unable to solve yourself or with the help of the Vaisala Helpdesk, contact a Vaisala Service Center.
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Chapter 7 ____________________________________________________________ Troubleshooting CHAPTER 7 TROUBLESHOOTING This chapter describes common problems, their probable causes and remedies, and provides contact information for technical support. Solving Typical Problems Some problems can be solved by simply resetting the transmitter. You can reset the transmitter by disconnecting the power or issuing the RESET command using the service port.
USER'S GUIDE ____________________________________________________________________ Error Messages The transmitter has error codes that can be displayed on the serial line using the ERRS command. See section Show Currently Active Errors on page 40.
Chapter 7 ____________________________________________________________ Troubleshooting 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.
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Chapter 8 _____________________________________________________________ Technical Data CHAPTER 8 TECHNICAL DATA This chapter provides the technical data of the DMT143. Specifications Table 14 Measured Parameters Property Description / Value Dewpoint temperature Measurement range (typical) -60 ... +60 °C (-76 ...
Dewpoint temperature (°C) USER'S GUIDE ____________________________________________________________________ 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 Not recommended for continuous measurement Accuracy ±2 °C Td Accuracy ±4 °C Td Accuracy not specified Dewpoint measurement low limit -40 -30 -20 -10 0 10 20 30 40 50 60 Temperature of measured gas (°C) 1202-126 Figure 24 Dewpoint Accuracy vs.
Chapter 8 _____________________________________________________________ Technical Data Table 17 General Property Description / Value ® Sensor Vaisala DRYCAP 180D Recommended calibration interval to confirm the specified accuracy 2 years Operating voltage with current output 18 ... 28 VDC with voltage output 12 ... 28 VDC with RS-485 12 ...
USER'S GUIDE ____________________________________________________________________ Spare Parts and Accessories Table 18 Spare Parts and Accessories for DMT143 Description Connection cable for MI70 Hand-Held Indicator USB service cable Loop-powered external display, Nokeval 301 Loop-powered external display, Nokeval 302 (with alarm relays) Installation flange ISO ½ Sintered filter Stainless steel filter Mounting nut Plug kit (ISO 1/2") Plug kit (NPT 1/2") Sealing ring set (3 pcs) Output cables 0.3 m (1.
Chapter 8 _____________________________________________________________ Technical Data Dimensions in mm AW24 12 28 G1/2" ISO228/1 57 22.5 91.6 1202-130 Figure 25 DMT143 Dimensions – Model With ISO Thread 32 AW30 12 NPT1/2" 22.5 49.1 91.
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