Vaisala HUMICAP DMT132 User Manual
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Vaisala HUMICAP DMT132 User Manual

Vaisala HUMICAP DMT132 User Manual

Dew point transmitter
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Summary of Contents for Vaisala HUMICAP DMT132

  • Page 1 M211289EN-B User Guide â Vaisala HUMICAP Dew Point Transmitter DMT132...
  • Page 2 This product contains software developed by The contents of this manual are subject to change Vaisala or third parties. Use of the software is without prior notice. governed by license terms and conditions Local rules and regulations may vary and they...

  • Page 3: Table Of Contents

    Table of Contents Table of Contents About This Document..................5 Version Information.....................5 Related Manuals....................5 Documentation Conventions................5 Trademarks......................6 Product Overview....................7 Introduction to DMT132..................7 Basic Features and Options................8 Transmitter Structure..................8 LED Indicator Plug (Optional)................9 Special Cover Set for HMK15 (Optional)............10 NPT Adapter (Optional)..................
  • Page 4 DMT132 User Guide M211289EN-B Serial Line Output Commands.................37 4.7.1 Output a Reading Once................37 Troubleshooting and Maintenance Commands..........37 4.8.1 Display Currently Active Errors..............37 4.8.2 Test Analog Output..................38 4.8.3 Set LED Indicator Level................38 Calibration and Adjustment Commands............39 4.9.1 Calibrate Humidity Measurement.............39 4.9.2 Calibrate Temperature Measurement............
  • Page 5 List of Figures List of Figures Figure Vaisala HUMICAPâ Dew Point Transmitter DMT132......... 8 Figure 2 DMT132 Transmitter Structure................. 9 Figure 3 DMT132 with LED Indicator Plug..............10 Figure 4 Special Cover Set for HMK15................10 Figure 5 DMT132 with NPT Adapter................11 Figure 6 Nokeval 301 Loop-Powered Display.............
  • Page 6 DMT132 User Guide M211289EN-B List of Tables Table 1 Document Versions....................5 Table 2 Related Manuals..................... 5 Table 3 DMT132 Measurement Parameters..............7 Table 4 Connector Pinouts....................19 Table 5 DMT132 Serial Interface Settings..............30 Table 6 DMT132 Serial Commands.................. 31 Table 7 Pressure Conversion Coefficients..............36 Table 8 Error Codes......................

  • Page 7: About This Document

    Chapter 1 – About This Document 1. About This Document 1.1 Version Information This document provides instructions for installing, operating, and maintaining Vaisala HUMICAPâ Dew Point Transmitter DMT132. Table 1 Document Versions Document Code Date Description M211289EN-B August 2018 This manual. Changes since the previous version: •...

  • Page 8: Trademarks

    Lists tools needed to perform the task. Indicates that you need to take some notes during the task. 1.4 Trademarks Vaisalaâ and HUMICAPâ are registered trademarks of Vaisala Oyj. Windowsâ is either a registered trademark or trademark of Microsoft Corporation in the United States and other countries.

  • Page 9: Product Overview

    Chapter 2 – Product Overview 2. Product Overview 2.1 Introduction to DMT132 The Vaisala HUMICAPâ Dew Point Transmitter DMT132 measures dew point temperature within measurement range -30 ... +50 °C (-22 ... +122 °F) T . The DMT132 is designed for OEM applications that require dew point measurement in this range, such as refrigeration dryers.

  • Page 10: Basic Features And Options

    DMT132 User Guide M211289EN-B Figure 1 Vaisala HUMICAPâ Dew Point Transmitter DMT132 2.2 Basic Features and Options • Dew point measurement range -30 ... +50 °C (-22 ... +122 °F) T • Output in T or T atm (calculated measurement parameter) • HUMICAPâ polymer sensor •...

  • Page 11: Led Indicator Plug (Optional)

    The service port (connector II) of the DMT132 can be equipped with a LED indicator plug (Vaisala order code 230388). The red LED on the plug will light up when the measured dew point temperature is above the set limit. If the transmitter is in error condition, the LED will...

  • Page 12: Special Cover Set For Hmk15 (Optional)

    To use the Vaisala Humidity Calibrator HMK15 with the DMT132 you need the special cover set (Vaisala order code 230914). The cover set includes one salt jar cover where one of the holes is specially designed for the DMT132, and rubber plugs for covering the unused holes.

  • Page 13: Npt Adapter (Optional)

    The DMT132 can be connected to a loop-powered external LED display (type Nokeval 301, Vaisala order code 226476). The display provides a reading of the output measurement parameter. The display is powered by the 4 ... 20 mA current signal, so there is no need for an external power supply.

  • Page 14: Connection Cables

    Power Supply Requirements (page 20). For the loop resistance of the display, refer to the manufacturer’s documentation. 2.8 Connection Cables Vaisala supplies shielded cables with M8 female straight threaded connector. Available in four lengths: • 0.3 m (1.0 ft) • 3 m (9.8 ft) •...

  • Page 15: Sampling Accessories

    For order codes of sampling accessories, see Spare Parts and Accessories (page 66). 2.10 Safety The Vaisala HUMICAPâ Dew Point Transmitter DMT132 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions:...

  • Page 16: Esd Protection

    2.10.1 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 an electrostatic discharge when touching, removing or inserting any objects inside the equipment housing.

  • Page 17: Installation

    Sampling from the process is easy by using Vaisala sampling cell options. The DMT132 is light in weight, which means that it can be installed in a sample pipeline in the sampling cells without the need for any additional mechanical support.

  • Page 18: Installing Transmitter

    DMT132 User Guide M211289EN-B 3.2 Installing Transmitter Before proceeding with the installation, select first a suitable measurement location. See Selecting Location (page 15). 1. Remove the yellow transport protection cap from the transmitter. Figure 9 Removing the Transport Protection Cap 2. If you are using the optional NPT adapter, apply PTFE tape or suitable paste sealant to the outer thread of the adapter.

  • Page 19: Figure 10 Installing The Transmitter

    Chapter 3 – Installation 4. Make sure that the threads on the mounting point are of the correct type, and fasten the transmitter to the measurement point. Always leave the sealing ring in place, it is always needed to achieve a tight installation. Use your hands to turn the transmitter from the 30 mm nut until it feels tight.

  • Page 20: Figure 12 Tightening With Plastic Wrench

    DMT132 User Guide M211289EN-B 5. Use the supplied plastic 30 mm wrench to tighten the connection. Sufficient tightness is achieved by turning 20 degrees after the point achieved by hand. CAUTION! Only tighten the transmitter from the 30 mm nut. Do NOT apply force to other points in the transmitter body.

  • Page 21: Wiring

    Chapter 3 – Installation 6. Connect the wires of the connection cable. When using cables provided with DMT132, refer to Wiring (page 19). See also Power Supply Requirements (page 20). Figure 13 Connecting the Cable and LED Indicator Plug 7. Plug in the cable to connector I of the transmitter and tighten it. For connector pinout, Wiring (page 19).

  • Page 22: Power Supply Requirements

    DMT132 User Guide M211289EN-B Figure 14 Connectors I and II 1 = VDC+ ＋ − 3 = GND 1 = VDC+ 4 = RS-485 D1+ ＋ RS-485 − 2 = RS-485 D0- 3 = GND Figure 15 Connector Pinout 3.3.1 Power Supply Requirements The DMT132 transmitters are designed to operate with a supply voltage of 10 ...

  • Page 23: Sampling From A Process

    Make sure there is sufficient flow of gas to the sensor (for example, 1 l/min) to give a representative sample. You can use the Vaisala Humidity Calculator to simulate the effect of pressure change to dew point. The Humidity Calculator is available at: www.vaisala.com/humiditycalculator.

  • Page 24: Dmt242Sc2 Sampling Cell With Swagelokâ Connectors

    To fit 6 mm tubing to the connectors, you can use an adapter such as Swagelok Reducer SS-6M0-R-4 (not supplied by Vaisala). DMT242SC2 is the suitable choice in, for example, plastics drying systems, where the measurement is made by tapping off the dryer system and bringing a small air stream to the sensor.

  • Page 25: Dsc74B Two-Pressure Sampling Cell

    Chapter 3 – Installation Do not open the leak screw more than 1/2 turn to avoid reducing the pressure in the sampling cell. The DSC74 comes with a quick connector that fits to industry standard compressed air line connectors (suitable for type D, Quick08, NIP08). This allows for easy installation and detachment of the dew point transmitter without having to shut down the process.

  • Page 26: Figure 18 Dsc74B

    Harmful gases can be recovered by connecting a collection system at the outlet (not available from Vaisala). In the basic operation of the DSC74B, the gas flows to the sensor from the front and the outlet is on the side.

  • Page 27: Figure 19 Removing The Leak Screw

    Chapter 3 – Installation Figure 19 Removing the Leak Screw 3.5.4.1 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.

  • Page 28: Figure 20 Default Assembly Of Dsc74C

    DMT132 User Guide M211289EN-B Figure 20 Default Assembly of DSC74C Gas goes in. The coil can also be used here. Gas comes out Coil Valve...

  • Page 29: Figure 21 Alternative Assembly Of Dsc74C (For Tight Spaces)

    Chapter 3 – Installation Figure 21 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 transmitter.

  • Page 30: Figure 22 Dm240Fa Duct Installation Flange With Dmt132

    DMT132 User Guide M211289EN-B Figure 22 DM240FA Duct Installation Flange with DMT132 Measured gas DMT132 transmitter DM240FA flange (thread G1/2" ISO) Recommended additional hole (plugged) for T field check reference measurement probe (for example, Vaisala DM70)

  • Page 31: Operation

    The DMT132 can be connected to a PC using the RS-485 line on Port II. It is recommended that you use the USB service cable (Vaisala order code 219690) for the connection, since the cable also provides the operating power from the USB port.

  • Page 32: Terminal Application Settings

    There is no reason to uninstall the driver for normal use. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver in Windows Control Panel.

  • Page 33: List Of Serial Commands

    Chapter 4 – Operation 6. You may need to adjust the Local echo setting in the Terminal category to see what you are typing on the serial line. To access the configuration screen while a session is running, click the right mouse button over the session window, and select Change Settings...

  • Page 34: Device Information And Status

    The ? command outputs a listing of device information. ?<cr> Example: >? >Device Name : DMT132 Dewpoint transmitter Calibrated : "20110223" Calibration location: "VAISALA/HEL" Serial number : "G0831004" Batch number : "G0000007" Sensor model : "HUMICAP180R" Sensor serial number: "F312"...

  • Page 35: Show Available Measurement Parameters

    Example: >vers DMT132 1.0.0 2011-01-24 4.4.4 Show Software Information SYSTEM<cr> Example: >system Device Name : DMT132 Dewpoint transmitter Copyright : Copyright (c) Vaisala Oyj 2011. All rights reserved. SW Name : DMT132 SW model : VAISALA SW version : 1.0.0.1214 >...

  • Page 36: Configuring Analog Output

    DMT132 User Guide M211289EN-B 4.5 Configuring Analog Output 4.5.1 Set Analog Output Measurement Parameter and Scaling Use the ASEL command to show or set the output measurement parameter ("quantity") and the scaling of the analog output. ASEL [quantity] [lowlimit highlimit]<cr> quantity Quantity that is output on the analog channel: TDF or TFDA. lowlimit The low limit of the output scaling in Celsius.

  • Page 37: Set Analog Output Error Notification

    Chapter 4 – Operation 4.5.2 Set Analog Output Error Notification If the transmitter is malfunctioning, the analog output is set to a pre-defined level of 3.8 mA. This overrides the normal measurement output of the channel. You can change the level, or disable this behavior, using the AERR command: AERR [on/off] [level]<cr>...

  • Page 38: Configuring Measurement Parameters

    DMT132 User Guide M211289EN-B 4.6 Configuring Measurement Parameters 4.6.1 Set Pressure Value for Dew Point Calculation The HUMICAPâ 180R sensor in the DMT132 is not very pressure-dependent. However, to maximize the measurement accuracy, the pressure of the system must be known. The pressure compensation value has been set at the factory according to the order form.

  • Page 39: Serial Line Output Commands

    Chapter 4 – Operation For example: 29.9213 ���� = 29.9213 × 0.03386388 = 1.01325 ��� � Conversions from mmHg and inHg are defined at 0 °C and from mmH O and inH O at 4 °C. You can also set the pressure compensation value when you connect the DMT132 to the MI70 indicator.

  • Page 40: Test Analog Output

    The output shows the test value of the analog output as well as diagnostic information that may be useful to Vaisala Service Center if there is a problem with the analog outputs. Example (enabling analog output test mode with 20 mA output): >atest 20...

  • Page 41: Calibration And Adjustment Commands

    Chapter 4 – Operation ALARM [on/off] [limit]<cr> on/off Enable (on) or disable (off) the LED indicator function. limit Dew point temperature above which the LED indicator is lit. Range -20 ... 50 °C. Example (show the current status of the LED indication): >alarm Alarm Led : OFF...

  • Page 42: Calibrate Temperature Measurement

    DMT132 User Guide M211289EN-B >rhcal 11.278554 Ref1 ? 11.3 Press any key when ready Saving settings...done > Example (two-point calibration): >rhcal 11.278554 Ref1 ? 11.3 Press any key when ready 75.091213 Ref2 ? 75 Saving settings...done > 4.9.2 Calibrate Temperature Measurement Use the CT command to perform a one-point or two-point temperature (T) calibration.

  • Page 43: Adjust Capacitance Measurement

    Chapter 4 – Operation >ct 22.3104 Ref1 ? 22.3 Press any key when ready ... 44.9746 Ref2 ? 45 > 4.9.3 Adjust Capacitance Measurement Use the CRH command to perform a one-point or two-point correction to the capacitance measurement of the transmitter. This command changes the offset and gain of the measured capacitance, and therefore affects humidity measurement over the entire temperature range.

  • Page 44: View User Adjustment Parameters

    DMT132 User Guide M211289EN-B >crh 11.41200712 Ref1 ? 11.3 Press any key when ready 74.72910210 Ref2 ? 75 > 4.9.4 View User Adjustment Parameters Use the L command to view the current user adjustment parameters that are affected by the CRH, RHCAL, CT, and LI commands. This command is useful for checking the currently applied correction.

  • Page 45: Other Commands

    Chapter 4 – Operation >li Cp offset : 0 ? Cp gain : 1 ? RH offset : 0 ? RH gain : 1 ? T offset : 0 ? T gain : 1 ? > 4.10 Other Commands 4.10.1 Display Command List HELP<cr>...

  • Page 46: Restore Factory Settings

    LI command. Set User Adjustment Parameters (page 42). If the HUMICAPâ sensor has been changed at a Vaisala Service Center, the factory calibration has been updated to match the new sensor, and it will not be affected by the FRESTORE command.

  • Page 47: Maintenance

    5.2 Changing Filter If the filter is contaminated, it should be replaced. New filters can be ordered from Vaisala (order code 230602). Be careful when changing the filter, since it is easy to break the sensors when the filter is removed.

  • Page 48: Changing Sensor

    DMT132 User Guide M211289EN-B Figure 25 Filter Structure Sealing ring (replace if damaged) Vaisala HUMICAP® 180R sensor and Pt1000 temperature sensor Spring washer Tube filter Replace the filter as follows: 1. Turn the filter counterclockwise until it is loose. 2. Pull the filter straight out carefully; do not damage the sensors, and do not lose the spring washer.

  • Page 49: Calibration And Adjustment

    For accurate calibration, disconnect the current loop from connector I for the duration of the calibration. Power the transmitter using the USB service cable (Vaisala order code 219690) instead.

  • Page 50: Field Check Using Dm70

    You can perform a simple field checking operation by comparing the readings of the DMT132 and the DM70 hand-held dew point meter with a calibrated reference probe. To have the transmitter calibrated and adjusted by Vaisala, contact a Vaisala Service Center or your local Vaisala representative.
  • Page 51 DMT132 in the measured temperature and dew point. If the difference is more, the DMT132 is in need of adjustment. You can send the DMT132 to be adjusted at Vaisala, or adjust the transmitter yourself. Notes on using the MI70 indicator with the DMT132: •...

  • Page 52: Humidity Calibration And Adjustment (Rhcal)

    5.4.2 Humidity Calibration and Adjustment (RHCAL) The procedure below describes a humidity measurement calibration and adjustment using serial line commands and the Vaisala Humidity Calibrator HMK15. You can use the procedure to do a one-point calibration (offset) or a two-point calibration (offset and gain).
  • Page 53 Chapter 5 – Maintenance 4. Verify that the connection works by giving the ? command: >? If the transmitter does not respond with device information: • Check your serial line settings and cable connections • Reconnect the USB cable, restart the terminal application, and try again 5.
  • Page 54 DMT132 User Guide M211289EN-B 11. When the measurement shown by RHCAL is stable, you can either apply the correction or exit the procedure: • To apply the correction, press ENTER one last time to update the value, type 11 and press ENTER again (assuming you are using the HMK15 and the LiCl salt).

  • Page 55: Temperature Calibration And Adjustment (Ct)

    Chapter 5 – Maintenance 17. Use the SEND command to verify that the measurement is OK: >send Tdf= -9.33'C > 5.4.3 Temperature Calibration and Adjustment (CT) The following procedure describes a temperature (T) measurement calibration and adjustment using serial line commands. You can use the procedure to do a one-point calibration (offset) or a two-point calibration (offset and gain).
  • Page 56 DMT132 User Guide M211289EN-B 8. Give the CT command. The output from the command shows the currently measured T value, and prompts you to enter the value of the first reference (Ref1). This is the reference on the colder end, which produces the offset correction for the measurement.

  • Page 57: Capacitance Adjustment (Crh)

    44). The procedure below adjusts the capacitance measurement of the transmitter using the serial line commands and the Vaisala Humidity Calibrator HMK15. You can use the procedure to do a one-point adjustment (offset) or a two-point adjustment (offset and gain).
  • Page 58 DMT132 User Guide M211289EN-B • Two-point adjustment requires additionally a > 50 %RH reference, with over 30 %RH difference between the two points. 1. Disconnect the cable from connector I of the DMT132 (if connected). 2. Connect the USB cable to connector II on the DMT132, and to a USB port on your PC. 3.
  • Page 59 Chapter 5 – Maintenance 10. Wait for 20 ... 40 minutes for the reading to stabilize. Press ENTER without typing anything to update the value shown by the CRH command. RH: 11.39800112 Ref1 ? RH: 11.38377201 Ref1 ? RH: 11.37988329 Ref1 ? 11.
  • Page 60 DMT132 User Guide M211289EN-B 16. Use the L command to verify that the new user adjustment parameters are in use, and write them down for later reference: >l 17. Use the SEND command to verify that the measurement is OK: >send Tdf= -9.33'C >...

  • Page 61: Troubleshooting

    If you cannot solve the problem and return the transmitter to the normal state, please contact Vaisala technical support. If repair is needed, you can have the transmitter serviced by a Vaisala Service Center. More Information ‣ Technical Support (page 67) 6.2 Error State...

  • Page 62: Error Codes

    DMT132 User Guide M211289EN-B • The ERRS command returns the currently active error code(s). For example: >errs Error: E2 Humidity sensor open circuit/not calibrated > The analog output levels for the error state are configurable using the AERR command; Set Analog Output Error Notification (page 35).
  • Page 63 Chapter 6 – Troubleshooting Error Code Error Message Possible Cause(s) RH reading too low Internal error Log corrupted Internal error...
  • Page 64 DMT132 User Guide M211289EN-B...

  • Page 65: Technical Data

    Chapter 7 – Technical Data 7. Technical Data Table 9 Measurement Performance Property Description/Value Dew Point Measurement range -30 ... +50 °C (-22 ... +122 °F) T Accuracy at +20 °C (+68 °F) ±1 °C for -3 ... 20 °C (+26.6 ... +68 °F) T ±2 °C for -15 ...

  • Page 66: Table 11 Outputs

    LED indication available for defined dew point limit/error state indication RS-485 serial line for service use Table 12 Mechanical Specifications Property Description/Value Sensor Vaisala HUMICAPâ 180R Recommended calibration interval 2 years (in refrigerant dryer application) Mechanical connection G1/2" ISO Operating voltage 10 ..

  • Page 67: Dimensions

    Chapter 7 – Technical Data Property Description/Value Color Black Number of contacts Conductors 0.25 mm (× 4) (0.00039 in (× 4)) Insulation Cable diameter 5.0 mm (0.2 in) Protection class IP67 / NEMA 4 Wire color code EN50044 7.1 Dimensions 125.5 80.5 AW 30 G1/2"...

  • Page 68: Spare Parts And Accessories

    DMT132 User Guide M211289EN-B 7.2 Spare Parts and Accessories Table 14 Spare Parts and Accessories Item Order Code Tube filter 230602 Special cover set for HMK15 230914 (calibrator fitting DMT132 and HMP60) NPT Adapter 210662SP Sample cells DMT242SC, DMT242SC2, DSC74, DSC74B, DSC74C, DMCOIL Duct installation flange DM240FA...

  • Page 69: Warranty

    Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product. Technical Support Contact Vaisala technical support at helpdesk@vaisala.com. Provide at least the following supporting information: • Product name, model, and serial number •...
  • Page 70 DMT132 User Guide M211289EN-B...
  • Page 72 www.vaisala.com...

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