Vaisala DMT152 User Manual
USER'S GUIDE
Vaisala DRYCAP® Dewpoint Transmitter
DMT152
M210865EN-F
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
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. Translated manuals and translated portions
of multilingual documents are based on the original English versions. In ambiguous
cases, the English versions are applicable, not the translations.
The contents of this manual are subject to change without prior notice.
This manual does not create any legally binding obligations for Vaisala towards
customers or end users. All legally binding obligations and agreements are included
exclusively in the applicable supply contract or the General Conditions of Sale and
General Conditions of Service of Vaisala.
_________________________________________________________________________________
Table of Contents
CHAPTER 1
GENERAL INFORMATION ............................................................................ 5
About This Manual ................................................................... 5
Contents of This Manual ....................................................... 5
Version Information ............................................................... 6
Related Manuals ................................................................... 6
Documentation Conventions ................................................. 6
Safety ......................................................................................... 7
ESD Protection ...................................................................... 7
Recycling .................................................................................. 7
Regulatory Compliances ......................................................... 8
Trademarks ............................................................................... 8
Warranty .................................................................................... 8
CHAPTER 2
PRODUCT OVERVIEW .................................................................................. 9
Introduction to Dewpoint Transmitter DMT152 ..................... 9
Basic Features and Options .................................................. 10
Transmitter Structure ............................................................. 11
CHAPTER 3
FUNCTIONAL DESCRIPTION ..................................................................... 13
Advanced DRYCAP® Technology ......................................... 13
Auto-Calibration .................................................................. 13
Sensor Purge ...................................................................... 14
CHAPTER 4
INSTALLATION ............................................................................................ 15
Selecting the Location ........................................................... 15
Installing the Transmitter ..................................................... 16
Wiring ...................................................................................... 19
Connection Cables .............................................................. 20
Power Supply Requirements ............................................... 22
Sampling from a Process ...................................................... 23
Pressure ......................................................................... 23
Leak Tightness and Materials ........................................ 23
Flow ................................................................................ 23
Sampling Accessories ........................................................... 24
DMT242SC Sampling Cell .................................................. 24
DMT242SC2 Sampling Cell with Swagelok Connectors .... 24
DSC74 Sampling Cell with Quick Connector and
Leak Screw .......................................................................... 25
DSC74B Two Pressure Sampling Cell ................................ 26
DSC74C Two-Pressure Sampling Cell with Coil ........... 27
NW40 Mounting Flange .......................................................... 30
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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 .............................................. 32
List of Serial Commands ....................................................... 34
Device Information and Status .............................................. 35
Show Device Information..................................................... 35
Show Transmitter Status ..................................................... 36
Show Firmware Version ...................................................... 36
Configuring Analog Outputs ................................................. 37
Limit Alarm ........................................................................... 39
Purge Status Alarm ............................................................. 40
Malfunction Alarm ................................................................ 41
Select Analog Output Quantity and Scaling ........................ 41
Configuring Serial Line Operatio n ........................................ 42
Set Serial Line Settings ....................................................... 42
Set Serial Line Response Time ........................................... 42
Set Transmitter Address ...................................................... 43
Format the Measurement Output ........................................ 43
Select Unit ........................................................................... 44
Set Serial Interface Mode .................................................... 45
Configuring Measurement Parameters ................................ 46
Enable or Disable Sensor Purge ......................................... 46
Set Pressure Value for ppm Calculation ............................. 46
Set Molar Mass for ppmw Calculation ................................. 48
Serial Line Output Commands .............................................. 49
Start Measurement Output .................................................. 49
Stop Measurement Output .................................................. 49
Set Output Interval ............................................................... 49
Output a Reading Once ....................................................... 50
Troubleshooting and Maintenance Commands .................. 50
Display the Currently Active Errors ..................................... 50
Test Analog Outputs ............................................................ 51
Calibrate Analog Output ...................................................... 52
Extend Analog Output Range .............................................. 52
Other Commands.................................................................... 53
Opening the Transmitter in POLL Mode.............................. 53
Closing the Connection to a Transmitter in POLL Mode ..... 53
Display Command List......................................................... 53
Set Time .............................................................................. 53
Reset Transmitter ................................................................ 54
Set LED Voltage .................................................................. 54
Restore Factory Settings ..................................................... 54
CHAPTER 6
MAINTENANCE ............................................................................................ 55
Cleaning the Transmitter ....................................................... 55
Changing the Filter ................................................................. 55
Calibration and Adjustment ................................................... 56
Field Check Using DM70 ..................................................... 57
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CHAPTER 7
TROUBLESHOOTING ................................................................................. 59
Typical Problems .................................................................... 59
Unknown Serial Settings ....................................................... 60
Error State ............................................................................... 60
Error Codes ............................................................................. 61
Technical Support .................................................................. 62
Product Returns ..................................................................... 62
CHAPTER 8
TECHNICAL DATA ...................................................................................... 63
Measured Variables ................................................................ 63
Operating Environment ......................................................... 64
Outputs .................................................................................... 64
General .................................................................................... 64
Output Cable Specifications ................................................. 65
Spare Parts and Accessories ................................................ 66
Dimensions in mm (inches) .................................................. 67
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List of Figures
Figure 1 Dewpoint Transmitter DMT152 ................................................. 11
Figure 2 DMT152 Installed Directly to Pipeline....................................... 16
Figure 3 Removing the Transport Protection Cap .................................. 16
Figure 4 Installing the Transmitter .......................................................... 17
Figure 5 Connecting the Cable ............................................................... 17
Figure 6 Connectors I and II ................................................................... 19
Figure 7 Connector Pinout ...................................................................... 19
Figure 8 Cable with Snap-On Connector ................................................ 20
Figure 9 Cable with Threaded Connector ............................................... 21
Figure 10 LED Cable ................................................................................ 21
Figure 11 USB Serial Interface Cable ....................................................... 21
Figure 12 DMT242SC2 (left) and DMT242SC (right) ............................... 24
Figure 13 DSC74 Sampling Cell with Access or ies ................................... 25
Figure 14 DSC74B .................................................................................... 26
Figure 15 Removing the Leak Screw ........................................................ 27
Figure 16 Default Assembly of DSC74C .................................................. 28
Figure 17 Alternative Assembly of DSC74C (for Tight Spaces) ............... 29
Figure 18 NW40 Mounting Flange ............................................................ 30
Figure 19 NW40 Mounting Flange Dimensions ........................................ 30
Figure 20 PuTTY Terminal Application ..................................................... 33
Figure 21 Filter Structure .......................................................................... 56
Figure 22 Supply Voltage Too Low for mA Output Error .......................... 57
Figure 23 Accuracy Over Temperature Range ......................................... 63
Figure 24 DMT152 Dimensions ................................................................ 67
List of Tables
Table 1 Manual Revisions ....................................................................... 6
Table 2 Related Manuals ......................................................................... 6
Table 3 Quantities Measured by the DMT152 ......................................... 9
Table 4 DMT152 Default Serial Interface Setting .................................. 32
Table 5 DMT152 Serial Commands ...................................................... 34
Table 6 FORM Command Quantities .................................................... 43
Table 7 FORM Command Modifiers ...................................................... 44
Table 8 Pressure Conversion Coefficients ............................................ 47
Table 9 Error Codes .............................................................................. 61
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Chapter 1 _________________________________________________________ General Information
CHAPTER 1
GENERAL INFORM ATION
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.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Informati on, provides general notes for the manual
and the Dewpoint Transmitter DMT152.
- Chapter 2, Product Overview, introduces the features and advantages
of Dewpoint Transmitter DMT152.
- Chapter 3, Functional Description, describes the advanced
functionality of Dewpoint Transmitter DMT152, including the autocalibration, sensor purge, and sensor warming functions.
- Chapter 4, Installation, provides you with information that helps you
install the Dewpoint Transmitter DMT152.
- Chapter 5, Serial Line Operation, contains instructions for operating
the serial interface of the DMT152.
- Chapter 6, Maintenance, provides information on the maintenance of
Dewpoint Transmitter DMT152.
- Chapter 7, Troubleshooting, describes common problems, their
probable causes and remedies, and provides contact information for
technical support.
- Chapter 8, Technical Data, provides the technical data of Dewpoint
Transmitter DMT152.
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Manual Code
Description
M210865EN-F
June 2013. This manual. Updated the Measured
flange.
M210865EN-E
May 2010. Previous version. Applicable from
description of the auto-calibration feature.
M210865EN-D
October 2008. Revised instructions for alarm
configuration in chapter 5.
Manual Code
Manual Name
M210866EN
DMT152 Quick Reference Guide
Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury
death.
Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
Note highlights important information on using the
Version Information
Table 1 Manual Revisions
Variables table (accuracy over temperature
ranges, non-calibrated ranges). Updated Figure
23 and Figure 24. Added information about NW40
software version 1.21 onwar ds . Updated technical
specification, updated serial commands, updated
list of spare parts and accessories. Updated
Related Manuals
Table 2 Related Manuals
WARNING
CAUTION
NOTE
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
or even
product.
6 ____________________________________________________________________ M210865EN-F
Chapter 1 _________________________________________________________ General Information
Do not modify the unit. Improper modification can damage the product
or lead to m
Recycle all applicable material.
Dispose of the unit according to statutory regulations.
Do not dispose of with regular household refuse.
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
alfunction.
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. It is possible to damage the product,
however, by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
Recycling
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench.
- When an ESD workbench is not available, ground yourself to the
equipment chassis with a wrist strap and a resistive connection cord.
- If you are unable to take either of the above precautions, touch a
conductive part of the equipment chassis with your other hand before
touching ESD sensitive components.
- Always hold component boards by the edges and avoid touching the
component contacts.
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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 industrial locations.
- EN 550022: Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement.
Trademarks
DRYCAP® is a registered trademark of Vaisala Oyj.
All other trademarks are the property of their respective owners.
Warranty
Visit our Internet pages for standard warranty terms and conditions:
www.vaisala.com/warranty.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.
8 ____________________________________________________________________ M210865EN-F
Chapter 2 ___________________________________________________________ Product Overview
Quantity
Abbreviation
Metric Unit
Non Metric Unit
Dewpoint/frost point
temperature
TDF
ºC
ºF
Parts per million
H2O
ppmv/ ppmw
ppmv/ ppmw
CHAPTER 2
PRODUCT OVERVIE W
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).
The DMT152 is designed for a wide range of OEM applications. The
transmitter is easy to install, and the mechanics have been designed for
harsh environments requiring protection against dust, dirt, and splashed
water.
The excellent stability and reliability of the transmitter’s performance is
based on advanced DRYCAP® polymer sensor technology. The
DRYCAP® technology has low maintenance needs due to its excellent
long term stability and durability against condensation. For more
information on DRYCAP® technology, refer to chapter Functional
Description on page 13.
Table 3 Quantities Measured by the DMT152
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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 ... 20 mA
and 0 … 5 V / 0 … 10 V
- Configurable alarm modes for analog outputs
- Digital output: RS-485
- Serial line connection also via USB serial interface cable
- Simultaneous use of analog and digital output possible
- Field check suitability with DM70 hand-held meter
- Optional sampling cells with different installation options available as
DMT152 installation accessories
- LED cable option that enables a visual indication of transmitter status:
LED lit when measurement is frozen (for example, purge active),
blinking for malfunction alarm
* When the dewpoint is below 0 °C, the transmitter outputs frostpoint
for Td
10 ___________________________________________________________________ M210865EN-F
Chapter 2 ___________________________________________________________ Product Overview
1 = 4-pin M8 connector I: analog output channels and operating
power
2 = 4-pin M8 connector II (shown with protective cap):
digital output (RS-485) and operating power
3 = 30mm nut
4 = DRYCAP® sensor protected with stainless steel mesh filter
(see Figure 21 on page 56)
5 = Connection thread: ISO G1/2", NPT 1/2", UNF 3/4"-16 2A, or
UNF 5/8"-18
Do not use a sealing ring with the NPT thread. Instead, seal the thread
using PTFE tape or PTFE paste sealant.
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. Opening the transmitter will void the
warranty.
NOTE
0710-151
Figure 1 Dewpoint Transmitter DMT152
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
section Spare Parts and Accessories on page 66.
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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. 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 dewpoint measurement. The selfdiagnostic procedures that are conducted are called auto-calibration,
sensor purge, and sensor warming.
Auto-Calibration
The auto-calibration feature of the DMT152 transmitter is an automatic
procedure which greatly reduces the possible drift in the dry end of the
dewpoint measurement. The auto-calibration is performed:
- at 45 minute intervals
- at shorter intervals if Td is near the dry end of the measurement range
- when the transmitter is powered up
- when the measured environment changes rapidly
During auto-calibration the sensor is warmed for a short period (< 1 min)
and the sensor capacitance values are evaluated at the elevated
temperature. The possible dry end drift is then corrected to correspond to
the calibrated values. Measurement and output remain active during autocalibration.
Auto-calibration is carried out only if several criteria for the
measurement environment are fulfilled. This ensures the reliability of the
adjustments, and maintains the excellent long term stability.
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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. The measurement output of the
transmitter is frozen to the last measured value for the duration of the
sensor purge.
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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. All leaks in the system must be eliminated to avoid
ambient humidity affecting the measurement.
Direct installation to the measured gas is the recommended installation
method if the temperature of the gas is suitable for DMT152 and no
additional filtering is needed due to very dusty or oily gas. Oil as such is
not harmful for the DRYCAP® sensor, but response time may be slower
if there are oil particles in the system, or if oil is collected to the filter
over a longer period of time. The maximum measurement pressure is
50 bara / 725 psia (absolute pressure) for direct measurement.
If the gas temperature is higher than the specified maximum operating
temperature of the transmitter, gas sampling and cooling it to ambient
temperature (for example, 10 °C / 18 °F) is recommended. Note that the
dewpoint 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 section
Sampling Accessories on page 24.
The DMT152 is light in weight, which means that it can be installed in a
sample pipeline in the sampling cells without the need of any additional
mechanical support.
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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 Removing the Transport Protection Cap
2. Prepare the sealing of the connection:
- If the transmitter has a parallel ISO G1/2" thread or UNF
3/4"-16 thread, place the sealing ring at the base of the
thread. Always use a new sealing ring; do not re-use a
previously installed one.
- If the transmitter has an NPT 1/2" thread, do not use the
sealing ring. Instead, apply PTFE tape or suitable paste
sealant to the thread. Follow the application instructions of
the sealant.
3. Make sure that the threads on the mounting point are of the correct
type, and fasten the transmitter to the measurement point. Use your
hands to turn the probe until it feels tight. Do not use force at this
point, and check that the sealing ring (if used) remains centered.
16 ___________________________________________________________________ M210865EN-F
Chapter 4 ________________________________________________________________ Installation
Only tighten the probe from the 30mm nut. Do NOT apply force to other
points in the probe body.
CAUTION
0710-129
Figure 4 Installing the Transmitter
4. 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.
5. Connect the wires of the connection cable. When using cables
provided with DMT152 refer to the wiring section on page 19. See
the power supply requirements on page 22.
Figure 5 Connecting the Cable
6. Plug in the cable to the transmitter. Be sure to use the correct
connector; refer to section Wiring on page 19.
7. Cover the unused connector on the transmitter with the rubber plug
that is attached to the transmitter.
VAISALA ________________________________________________________________________ 17
0710-130
User's Guide _______________________________________________________________________
The transmitter always performs the self
sensor purge when starting up. Keep the transmitter continuously
powered to optimize its measurement performance and availability.
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. If the
measurement environment changes during the startup, the
startup may take up to 15 minutes.
NOTE
-diagnostic procedure and
18 ___________________________________________________________________ M210865EN-F
Chapter 4 ________________________________________________________________ Installation
Pin
Connector I
Connector II
Wire color
1
VDC supply+
VDC supply+
Brown
2
Signal Ch 1+
RS-485 - / B
White
3
GND
GND
Blue
4
Signal Ch 2+ / LED
RS-485 + / A
Black
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 seri
cable or DM70 handheld dewpoint meter (which also provide operation
power) is OK.
Wiring
0707-035
Figure 6 Connectors I and II
0707-036
Figure 7 Connector Pinout
CAUTION
VAISALA ________________________________________________________________________ 19
al interface
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