Vaisala DRYCAP DMT152 User Manual
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Vaisala DRYCAP DMT152 User Manual

Vaisala DRYCAP DMT152 User Manual

Dew point transmitter
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M210865EN-J
User Guide
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Vaisala DRYCAP
Dew Point Transmitter
DMT152

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  • Page 1 M210865EN-J User Guide â Vaisala DRYCAP Dew Point Transmitter DMT152...
  • Page 2 Vaisala Oyj Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland P.O. Box 26, FI-00421 Helsinki, Finland +358 9 8949 1 Visit our Internet pages at www.vaisala.com. © Vaisala Oyj 2019 No part of this document may be information contained in this document.

  • Page 3: Table Of Contents

    Table of Contents Table of Contents About This Document................... 7 Version Information..................7 Related Manuals....................7 Documentation Conventions................7 Trademarks......................8 Product Overview................... 9 Introduction to DMT152..................9 2.1.1 Basic Features and Options..............9 2.1.2 Transmitter Structure................10 2.1.3 Safety......................11 2.1.4 ESD Protection...................11 2.1.5 Regulatory Compliances................
  • Page 4 DMT152 User Guide M210865EN-J Configuring Analog Outputs.................35 5.3.1 Limit Alarm....................36 5.3.2 Purge Status Alarm................. 37 5.3.3 Malfunction Alarm...................38 5.3.4 Select Analog Output Parameter and Scaling........39 Configuring Serial Line Operation..............39 5.4.1 Set Serial Line Settings................39 5.4.2 Set Serial Line Response Time.............. 40 5.4.3 Set Transmitter Address................
  • Page 5 Table of Contents Technical Data....................60 Specifications....................60 Spare Parts and Accessories................. 63 Dimensions......................65 Warranty......................67 Technical Support....................67 Recycling......................67...
  • Page 6 DMT152 User Guide M210865EN-J List of Figures Figure 1 DMT152 Probe Parts..................10 Figure 2 DMT152 Installed Directly to Pipeline (Max. 50 bar)....... 13 Figure 3 Connectors I and II....................16 Figure 4 Connector Pinout....................16 Figure 5 Output Noise Minimization Wiring Option..........17 Figure 6 Nokeval 301 Loop-Powered Display............20 Figure 7...
  • Page 7 List of Tables List of Tables Table Document Versions (English)................7 Table 2 Related Manuals....................7 Table 3 DMT152 Measurement Parameters..............9 Table 4 Standard Wiring Pinouts and Wire Colors..........15 Table 5 Output Noise Minimization Wiring Option Pinouts and Wire Colors......................17 Table 6 Connection Cable Options................
  • Page 8 DMT152 User Guide M210865EN-J...

  • Page 9: About This Document

    Chapter 1 – About This Document 1. About This Document 1.1 Version Information Table 1 Document Versions (English) Document Code Date Description M210865EN-J October 2019 This manual. • Added information on Nokeval display support. • Corrected the dew point measurement range upper limit specification from −10 °C to −20 °C.

  • Page 10: Trademarks

    Note highlights important information on using the product. 1.4 Trademarks DRYCAPâ is a registered trademark of Vaisala Oyj. All other product or company names that may be mentioned in this publication are trade names, trademarks, or registered trademarks of their respective owners.

  • Page 11: Product Overview

    2. Product Overview 2.1 Introduction to DMT152 The Vaisala DRYCAPâ dew point transmitter DMT152 measures dew point temperature accurately in a measurement range from −80 °C to −20 °C (−112 … −4 °F). The maximum output range of the transmitter is −100 … 20 °C (−148 … +68 °F).

  • Page 12: Transmitter Structure

    When installing a DMT152 transmitter with ISO or UNF thread, use a sealing ring to achieve a tight installation. Three copper sealing rings are provided with the transmitter, and more can be ordered from Vaisala. Note that the sealing rings for ISO and UNF threads are different. See Spare Parts and Accessories (page...

  • Page 13: Safety

    2.1.4 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 14: Functional Description

    DMT152 User Guide M210865EN-J 3. Functional Description 3.1 Advanced DRYCAP Technology Dew point transmitter DMT152 utilizes an advanced, patented measurement technology to ensure accurate measurement with excellent long-term stability. This results in very low maintenance requirements for the transmitter. The lasting performance is achieved with microprocessor technology and software that automatically performs self-diagnostic functions in addition to the normal dew point measurement.

  • Page 15: Installation

    (for example, 10 °C / 18 °F) is recommended. Note that the dew point temperature must be clearly lower than the ambient temperature to avoid condensation in the sampling line. Sampling from the process is easy by using Vaisala sampling cell options; see Sampling Accessories (page 21).
  • Page 16 DMT152 User Guide M210865EN-J After selecting a suitable measurement location, install the transmitter as instructed here. 1. Remove the yellow transport protection cap from the transmitter. Do not touch the filter with your hands. 2. Prepare the sealing of the connection: a.

  • Page 17: Wiring

    Chapter 4 – Installation 5. Connect the wires of the connection cable. When using cables provided with DMT152, see Wiring (page 15) Power Supply Requirements (page 19). 6. Plug in the cable to the transmitter. Be sure to use the correct connector; see Wiring (page 15).

  • Page 18: Figure 3 Connectors I And Ii

    DMT152 User Guide M210865EN-J Figure 3 Connectors I and II V/mA V/mA + / A RS485 - / B Figure 4 Connector Pinout 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.

  • Page 19: Output Noise Minimization Option

    Chapter 4 – Installation 4.3.1 Output Noise Minimization Option To minimize the output noise: • Wire only the analog outputs (V/mA) to Port I • Connect the power supply only to Port II Avoid connecting the Port I and Port II grounds (pin #3) together V/mA V/mA + / A...

  • Page 20: Connection Cables

    DMT152 User Guide M210865EN-J 4.3.2 Connection Cables The following connection cable options are available for DMT152: • Unshielded cable with M8 female straight snap-on connector • Shielded cable with M8 female straight threaded connector • Unshielded cable with LED indicator for analog channel 2, 90° angled M8 female threaded connector •...

  • Page 21: Power Supply Requirements

    The maximum current consumption is 220 mA pulsed current. DMT152 can be powered by the MI70 indicator or the Vaisala USB cable. However, the power supplied by these devices may not be enough for all functions of the transmitter (for example, the current output).

  • Page 22: Sampling From Process

    DMT152 User Guide M210865EN-J Figure 6 Nokeval 301 Loop-Powered Display DMT152 1 VDC+ (brown) Analog connector 4 ... 20 mA output 4 Ch2+ (black) Nokeval 301/302 2 Ch1+ (white) Power supply 21 ... 28 VDC Nokeval 301/302 3 GND (blue) Figure 7 DMT152 Nokeval 301/302 Wiring Diagram 4.5 Sampling from Process Sampling is needed when direct measurement of the air or gas is not possible or desirable.

  • Page 23: Sampling Accessories

    If the sensor is at a different pressure than the process itself, there may be an error of several tens of degrees in the dew point measurement. You can use the Vaisala Humidity Calculator to simulate the effect of pressure change to dew point. The Humidity Calculator can be found at www.vaisala.com/humiditycalculator.

  • Page 24: Dsc74 Sampling Cell With Quick Connector And Leak Screw

    DMT152 User Guide M210865EN-J 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. The Swagelok connectors of DMT242SC2 connect easily to a cooling coil or tubing, providing the essential function of cooling the dry air to ambient temperature before it reaches the sensor.

  • Page 25: Dsc74B Two-Pressure Sampling Cell

    Chapter 4 – 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 10 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: Dsc74C Two-Pressure Sampling Cell With Coil

    Chapter 4 – Installation Figure 11 Removing the Leak Screw 4.6.5 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 12 Default Assembly Of Dsc74C

    DMT152 User Guide M210865EN-J Figure 12 Default Assembly of DSC74C Gas goes in. The coil can also be used here. Gas comes out Coil Valve...

  • Page 29: Figure 13 Alternative Assembly Of Dsc74C (For Tight Spaces)

    Chapter 4 – Installation Figure 13 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: Nw40 Mounting Flange

    DMT152 User Guide M210865EN-J 4.6.6 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. Vaisala does not provide the flange counterpart, only the attachment for DMT152.

  • Page 31: Serial Line Operation

    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 32 3. Select the Serial settings category, and check that the correct COM port is selected in the Serial line to connect to field. You can check which port the USB cable is using with the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu.

  • Page 33: List Of Serial Commands

    Chapter 5 – Serial Line 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 INTV [0 ... 255 Set the continuous output interval (for RUN mode and R S/MIN/H] command) Set voltage for LED alarm (not needed with Vaisala LED cable) Set the molar mass of the process gas (used in ppm calculation) OPEN [0 ... 99]...

  • Page 35: Device Information

    Batch number : D1330070 Module number : ???????? Sensor number : C1420000 Cal. date : 20080512 Cal. info : Vaisala/HEL Serial mode : STOP Baud P D S : 19200 N 8 1 Output interval: Address Pressure : 1.0132 bar Filter : 1.000...

  • Page 36: Show Firmware Version

    DMT152 User Guide M210865EN-J The final status character can have several values: Normal status Transmitter error Retrying auto-calibration due to fluctuations in the supply voltage Transmitter startup Some example status codes: 0109 Transmitter performing startup procedure 1100 Sensor purge in progress, output frozen 1110 Settling period after purge, output frozen 0000...

  • Page 37: Configuring Analog Outputs

    The malfunction alarm can also be enabled for a channel in ON/OFF output mode. See Malfunction Alarm (page 38). When the transmitter is ordered from Vaisala, the modes are configured as specified in the order form. You can change the operation settings after delivery using the AMODE command: Table 12 AMODE command...

  • Page 38: Limit Alarm

    DMT152 User Guide M210865EN-J Syntax Description Example: amode 2 1 Ch1 output : 4 ... 20 mA Ch2 output : 0 ... 20 mA 5.3.1 Limit Alarm The limit alarm is activated when the measured parameter goes below the low limit or above the high limit.

  • Page 39: Purge Status Alarm

    Chapter 5 – Serial Line Operation Syntax Description The following example shows that a high limit alarm has been enabled for channel 1. If the measured value rises above the -40.00 °C T limit, analog channel 1 is set to 5 V (Limit Hi = -40.00, Level Hi = 5.00).

  • Page 40: Malfunction Alarm

    DMT152 User Guide M210865EN-J Table 14 STATUS command Syntax Description STATUS<cr> Select at the prompt (?) whether the alarm is enabled or disabled and define the voltage/ current levels. The following example shows the purge status alarm enabled for channel 1: status Channel 1: Status...

  • Page 41: Select Analog Output Parameter And Scaling

    Chapter 5 – Serial Line Operation The malfunction alarm is always enabled for channels that are in the normal measurement modes (see Configuring Analog Outputs (page 35)), but you can enable or disable it using the ALARM command for channels that are in the ON/OFF output mode. 5.3.4 Select Analog Output Parameter and Scaling Use the ASEL command to select which measurement parameters the analog channels output.

  • Page 42: Set Serial Line Response Time

    DMT152 User Guide M210865EN-J Syntax Description Example: seri 9600 e 7 1 Baud P D S 9600 E 7 1 5.4.2 Set Serial Line Response Time With the SDELAY command you can set the delay (response time) of the serial line, or view the currently set delay value.

  • Page 43: Table 18 Form Command Parameters

    Chapter 5 – Serial Line Operation Syntax Description FORM [x]<cr> [x] = formatter string The formatter string consists of parameters and modifiers. The maximum length of the form string is 74 characters. When entering the command, use the abbreviations of the parameters. The parameters are presented in Table 18 (page 41), and...

  • Page 44: Select Unit

    DMT152 User Guide M210865EN-J Modifier Description ADDR Transmitter address with 2 characters (00 … 99) Currently active transmitter errors in a 9-bit field: bit0 … bit8 • bit0 T MEAS error • bit1 F MEAS error • bit2 Voltage too low error •...

  • Page 45: Set Serial Line Operating Mode

    Chapter 5 – Serial Line Operation 5.4.6 Set Serial Line Operating Mode Table 21 SMODE Command Syntax Description SMODE [xxx]<cr> [xxx] = select the serial line interface mode: • STOP • RUN • POLL Table 22 (page 43) for a description of the serial modes. Table 22 Selection of Output Modes Mode Measurement Output...

  • Page 46: Set Pressure Value For Ppm Calculation

    DMT152 User Guide M210865EN-J Table 23 XPUR command Syntax Description XPUR [ON/OFF]<cr> ON = Enable sensor purge OFF = Disable sensor purge Example: xpur off Purge After giving the XPUR OFF command, the transmitter will not perform a sensor purge until one of the following events takes place: •...

  • Page 47: Set Molar Mass For Ppm W Calculation

    Chapter 5 – Serial Line Operation The pressure conversion coefficients from other pressure units to bars are given in Table 25 (page 45). Table 25 Pressure Conversion Coefficients From To bar 0.00001 ² PaN/m mmHg torr 0.001333224 inHg 0.03386388 0.00009806650 0.002490889 1.01325 0.980665 0.06894757...

  • Page 48: Serial Line Output Commands

    DMT152 User Guide M210865EN-J Table 26 MOL command Syntax Description MOL [n]<cr> [n] = Molar mass (in g/mol) of the gas in the measurement environment. Examples: mol 146.06 146.0600 146.0600 You can also set the molar mass when you connect DMT152 to the MI70 indicator. 5.6 Serial Line Output Commands 5.6.1 Start Measurement Output Use the R command to start the continuous outputting of measurement values as an ASCII text...

  • Page 49: Stop Measurement Output

    Chapter 5 – Serial Line Operation 5.6.2 Stop Measurement Output You can stop the measurement output by pressing the Esc key, or with the S command: S <cr> 5.6.3 Set Output Interval Use the INTV command to change the output interval of the automatically repeating measurement messages.

  • Page 50: Troubleshooting And Maintenance Commands

    Channel 1 output value (V or mA) Channel 2 output value (V or mA) The output shows the test values of the analog channels as well as diagnostic information that may be useful to Vaisala Service Center if there is a problem with the analog outputs.

  • Page 51: Calibrate Analog Output

    Chapter 5 – Serial Line Operation Syntax Description Examples: atest 1 15 1.00 2660 15.00 19425 atest 0.00 0.00 20110 5.7.3 Calibrate Analog Output Use the ACAL command to force the analog outputs to the following values: • Current output: 2 mA and 18 mA •...

  • Page 52: Other Commands

    DMT152 User Guide M210865EN-J Syntax Description Example: aover on : ON The following example illustrates how the analog output is affected. Channel 1 outputs T with voltage output 0 … 5 V (-80 °C … -30 °C). After giving the AOVER ON command, the range is 0 …...

  • Page 53: Display Command List

    With the LED command, you can set the supply voltage that is provided to the LED when the LED alarm mode is used. If you are using the Vaisala LED cable, leave this setting at the default voltage (2.80 V).

  • Page 54: Restore Factory Settings

    DMT152 User Guide M210865EN-J Table 36 LED command Syntax Description LED<cr> Enter the LED voltage at the prompt. Example: Ch 1 Led Voltage 2.80 V Ch 2 Led Voltage 2.80 V 5.8.7 Restore Factory Settings Use the FRESTORE command to restore the factory settings to the transmitter. FRESTORE<cr>...

  • Page 55: Maintenance

    If the filter is contaminated, replace it with a new one. 6.2 Changing the Filter If the filter is contaminated, it should be replaced. New filters can be ordered from Vaisala (order code 220957). Be careful when changing the filter, since it is easy to break the sensor when the filter is removed.

  • Page 56: Calibration And Adjustment

    DM70 handheld dewpoint meter with a calibrated reference probe. For more information, see Field Check Using DM70 (page 54). If there is need for calibration or adjustment, contact a Vaisala Service Center or your local Vaisala representative. 6.3.1 Field Check Using DM70 To check the accuracy of DMT152 in the field, you need the following equipment: •...
  • Page 57 Chapter 6 – Maintenance In the procedure described here, the readings of the probes are checked individually. You can also perform the field check so that you connect the reference probe simultaneously with the DMT152 you are checking. In this case, you need two connection cables if you are using a DMT152 also as the reference probe.
  • Page 58 DMT152 User Guide M210865EN-J 11. Wait for the reference probe to provide a stable reading, and compare it with the reading from DMT152. The difference between the readings will give you an indication of the approximate drift of DMT152 and its need for calibration. As a general rule, the reading from DMT152 should be within ±4 °C T of the reading from the reference probe.

  • Page 59: Troubleshooting

    RESET command on the serial line. If you cannot locate the source of the error and return the transmitter to the normal state, contact Vaisala technical support. See www.vaisala.com/support for more information.

  • Page 60: Error Codes

    DMT152 User Guide M210865EN-J • Serial line outputs asterisk characters "*" instead of measurement data. For example: Tdf=****** 'C H2O=****** ppm The analog output levels for the error state are configurable using the AERR command; see Malfunction Alarm (page 38). Note that the asterisk characters on the serial line may also appear during the startup procedure.
  • Page 61 Chapter 7 – Troubleshooting Error Code Cause Voltage too low for mA output error Supplied operating voltage is too low for reliable operation of the analog current output. It is normal to receive this error when using the MI70 indicator or the USB serial interface cable, as they do not provide a sufficient operating voltage to operate the...

  • Page 62: Technical Data

    DMT152 User Guide M210865EN-J 8. Technical Data 8.1 Specifications Table 38 Measurement Performance Property Description/Value Sensor Vaisala DRYCAPâ 180U Thin-film capacitive polymer sensor Recommended calibration interval 2 years Dew Point Temperature Measurement range −80 … −20 °C (−112 … −4 °F) T Accuracy −80 …...

  • Page 63: Figure 17 Accuracy Over Temperature Range

    Chapter 8 – Technical Data -100 Temperature of measured gas (°C) Figure 17 Accuracy Over Temperature Range Table 39 Operating Environment Property Description/Value Temperature −40 … +70 °C (−40 … +158 °F) Relative humidity 0 … 100 %RH (up to +20 °C / +68 °F) Pressure 0 …...

  • Page 64: Table 41 Mechanical Specifications

    DMT152 User Guide M210865EN-J Property Description/Value Typical Temperature Dependence Voltage output ±0.001 % of span / °C Current output ±0.005 % of span / °C Operating Voltage RS-485 output 11 … 28 VDC Voltage output 15 … 28 VDC Current output 21 …...

  • Page 65: Spare Parts And Accessories

    Chapter 8 – Technical Data Property Specification Color Black Number of contacts Conductors 0.25 mm (× 4) / 0.00039 inch (× 4) Insulation Cable diameter 5.0 mm / 0.2 in Protection class IP67 / NEMA 4 Wire color code EN50044 8.2 Spare Parts and Accessories Table 43 Accessories Item...
  • Page 66 DMT152 User Guide M210865EN-J Item Order Code 5 m (16.4 ft) shielded cable, M8 threaded HMP50Z500SP connector 10 m (32.8 ft) shielded cable, M8 threaded HMP50Z1000SP connector Sampling Cells (Available for ISO G1/2") Basic sampling cell DMT242SC With Swagelok 1/4" male connectors DMT242SC2 With a quick connector and leak screw DSC74...

  • Page 67: Dimensions

    Chapter 8 – Technical Data 8.3 Dimensions 120.5 [4.74] 76 [2.99] 32.5 [1.28] G 1/2" ISO 228-1 AW30 [1.18] 128.5 [5.06] 76 [2.99] 32.5 [1.28] 1/2" NPT 120.5 [4.74] 76 [2.99] 32.5 [1.28] 3/4"-16 UNF 120.5 [4.74] 76 [2.99] 32.5 [1.28] [in] 5/8"-18 UNF Figure 18 DMT152 Dimensions...
  • Page 68 DMT152 User Guide M210865EN-J...

  • 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 as applicable: • Product name, model, and serial number •...
  • Page 70 DMT152 User Guide M210865EN-J...
  • Page 72 www. v aisala.com...

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