Vaisala DPT145 User Manual

USER'S GUIDE
Vaisala Multiparameter Transmitter
DPT145 for SF6
Gas
M211371EN-D
PUBLISHED BY
Vaisala Oyj Street address: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland Mailing address: P.O. Box 26, FI-00421 Helsinki, Finland Phone: +358 9 8949 1 Fax: +358 9 8949 2227
Visit our Internet pages at www.vaisala.com.
© Vaisala 2014
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 ............................................................................ 7
About This Manual ................................................................... 7
Contents of This Manual ....................................................... 7
Version Information ............................................................... 8
Related Manuals ................................................................... 8
Documentation Conventions ................................................. 8
Safety ......................................................................................... 9
ESD Protection .................................................................... 10
Recycling ................................................................................ 10
Regulatory Compliances ....................................................... 11
Patent Notice .......................................................................... 11
Trademarks ............................................................................. 11
Software License .................................................................... 12
Warranty .................................................................................. 12
CHAPTER 2
PRODUCT OVERVIEW ................................................................................ 13
Introduction to DPT145 .......................................................... 13
Basic Features and Options .................................................. 14
Transmitter Parts .................................................................... 15
Weather Shield ....................................................................... 16
CHAPTER 3
FUNCTIONAL DESCRIPTION ..................................................................... 17
Measurement Needs of SF6 Insulation ................................. 17
Sensor Technology ................................................................ 18
MPS1 Multiparameter Sensor ............................................. 18
DRYCAP® Technology ....................................................... 18
Auto-Calibration ............................................................. 19
Sensor Purge ................................................................. 19
BAROCAP® Technology .................................................... 19
DPT145 Start-up Sequence ................................................... 20
CHAPTER 4
INSTALLATION ............................................................................................ 21
Transmitter Configuration Before Installation .................... 21
Selecting the Location ........................................................... 22
Warning – Read Before Installation ...................................... 23
Installation Without Weather Shield ..................................... 24
Installation With Weather Shield .......................................... 25
Wiring ...................................................................................... 28
Standard Wiring .................................................................. 28
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Alternate Wiring for Power Supply ...................................... 29
Stabilization of Dewpoint Reading After Installation .......... 29
CHAPTER 5
OPERATION ................................................................................................. 30
Transmitter Start-Up ............................................................... 30
Serial Communication ............................................................ 31
Connecting to the Serial Interface ....................................... 31
Installing the Driver for the USB Service Cable ............. 31
Terminal Application Settings .............................................. 32
List of Serial Commands ....................................................... 33
Device Information ................................................................. 34
Show Device Information..................................................... 34
Show Currently Active Errors .............................................. 35
Show Command List ........................................................... 35
Show Firmware Version ...................................................... 36
Show Serial Number ............................................................ 36
Serial Line Output Commands .............................................. 36
Start Measurement Output .................................................. 36
Stop Measurement Output .................................................. 36
Set Output Interval ............................................................... 37
Output a Reading Once ....................................................... 37
Configuring Measurement Parameters ................................ 38
Set Mixing Ratio .................................................................. 38
Set Molar Weight of Other Gas ........................................... 38
Set Pressure Normalization Temperature ........................... 38
Set Measurement Output Format ........................................ 39
Select Unit ........................................................................... 41
Configuring Serial Line Operation ........................................ 41
Set Serial Line Operating Mode .......................................... 41
Set Serial Line Settings ....................................................... 42
Set Transmitter Address ...................................................... 42
Set Serial Line Response Time ........................................... 43
Other Commands.................................................................... 43
Opening the Transmitter in POLL Mode.............................. 43
Closing the Connection to a Transmitter in POLL Mode ..... 44
Show Transmitter Uptime .................................................... 44
Reset Transmitter ................................................................ 44
Restore Factory Settings ..................................................... 44
Modbus Communication ........................................................ 45
Addressing with Modbus Protocol ....................................... 45
Accessing Serial Port Command Interface from
Modbus Mode ................................................................. 45
Configuration Commands Related to Modbus ............... 46
CHAPTER 6
MAINTENANCE ............................................................................................ 47
Periodic Maintenance ............................................................. 47
Cleaning .............................................................................. 47
Calibration and Adjustment ................................................. 47
Field Check Using an MI70 Indicator .................................. 47
Repair Maintenance ................................................................ 49
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CHAPTER 7
TROUBLESHOOTING ................................................................................. 50
Solving Typical Problems...................................................... 50
Error Messages ...................................................................... 51
Unknown Serial Settings ....................................................... 52
Technical Support .................................................................. 52
Product Returns ..................................................................... 53
CHAPTER 8
TECHNICAL DATA ...................................................................................... 54
Specifications ......................................................................... 54
Spare Parts and Accessories ................................................ 57
Dimensions in mm ................................................................. 57
APPENDIX A
MODBUS REFERENCE ............................................................................... 60
Default Communication Settings .......................................... 60
Supported Modbus Functions .............................................. 60
Modbus Register Map ............................................................ 61
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List of Figures
Figure 1 DPT145 with DILO DN20 Adapter ............................................ 14
Figure 2 DPT145 Transmitter Parts and Adapters ................................. 15
Figure 3 Weather Shield ......................................................................... 16
Figure 4 MPS1 Sensor ............................................................................ 18
Figure 4 DPT145 Startup Sequence ....................................................... 20
Figure 5 DPT145 Configuration with the MI70 Indicator ......................... 21
Figure 6 Indoor Installation in a Circuit Breaker ..................................... 22
Figure 7 Wiring Non-Isolated RS-485 ..................................................... 28
Figure 8 Wiring Power Supply Using Port I ............................................ 29
Figure 9 PuTTY Terminal Application ..................................................... 33
Figure 10 Comparing Dewpoint Readings on MI70 .................................. 48
Figure 11 DPT145 Dewpoint Measurement Accuracy ............................. 55
Figure 12 DPT145 with DILO DN20 Adapter ............................................ 57
Figure 13 DPT145 with DILO DN8 Adapter .............................................. 58
Figure 14 DPT145 with ABB Malmkvist Adapter ...................................... 58
Figure 15 DPT145 with Alstom G1/2" Adapter ......................................... 59
Figure 16 DPT145 with DILO DN20 Adapter and Weather Shield ........... 59
List of Tables
Table 1 Manual Revisions ....................................................................... 8
Table 2 Related Manuals ......................................................................... 8
Table 3 Output Parameters of DPT145 ................................................. 13
Table 4 Default Serial Interface Settings ............................................... 32
Table 5 List of Serial Commands .......................................................... 33
Table 6 FORM Command Parameters .................................................. 40
Table 7 FORM Command Modifiers ...................................................... 40
Table 8 Selection of Output Modes ....................................................... 41
Table 9 Configuration commands for Modbus RTU .............................. 46
Table 10 Troubleshooting Table .............................................................. 50
Table 11 Error Messages ........................................................................ 51
Table 12 Measured Parameters .............................................................. 54
Table 13 Calculated Parameters ............................................................. 54
Table 14 Performance ............................................................................. 54
Table 15 Operating Environment ............................................................. 55
Table 16 Outputs ..................................................................................... 55
Table 17 General ..................................................................................... 56
Table 18 DPT145 Spare Parts and Accessories ..................................... 57
Table 19 Default Communication Settings .............................................. 60
Table 20 Supported Function Codes ....................................................... 60
Table 21 Modbus Register Map ............................................................. 61
Table 22 Device Identification Objects .................................................... 62
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Chapter 1 _________________________________________________________ General Information
CHAPTER 1

GENERAL INFORMATION

This chapter provides general notes for the manual and the DPT145.

About This Manual

This manual provides information for installing, operating, and maintaining Vaisala Multiparameter Transmitter DPT145 for SF6 Gas.

Contents of This Manual

This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual and the DPT145
- Chapter 2, Product Overview, introduces the features, advantages, and the product nomenclature.
- Chapter 3, Functional Description, describes the primary application and the sensor technology of DPT145.
- Chapter 4, Installation, provides you with information that is intended to help you install the DPT145.
- Chapter 5, Operation, contains information that is needed to operate the DPT145.
- Chapter 6, Maintenance, provides information that is needed in basic maintenance of the DPT145.
- 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 the DPT145.
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Manual Code
Description
M211371EN-C
This manual. Added a minimum baud rate
shipment.
M211371EN-C
Previous version.
Manual Code
Manual Name
M211369EN
DPT145 Quick Guide

Version Information

Table 1 Manual Revisions
requirement when using the Modbus protocol. Added a packing recommendation for return

Related Manuals

Table 2 Related Manuals

Documentation Conventions

WARNING
CAUTION
NOTE
Throughout the manual, important safety considerations are highlighted as follows:
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 or even 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 product.
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Chapter 1 _________________________________________________________ General Information
Ground the product and verify outdoor installation grounding periodically to minimize shock hazard.
Do not or lead to malfunction.
Do not drop or hit the transmitter. The sensor is fragile and may break from a sudden shock.
When transporting the transmitter, use the original shipping box Vaisala.
Do not open the connection between the adapter and the transmitter. They are connected at the factory, and the connection should remain unopened to guarantee tightness.
Use tools only on the nut of the adapter, where the transport p cap is connected.
Keep the transmitter dry and clean.
Do not remove the yellow transport protection cap before you are ready to install the transmitter. Uncapped transmitters will absorb moisture which will affect the dewpoint measurement.
Connect the transmitter directly to the main SF a sampling line.
After installation, the transmitter will have a small amount of moisture inside it. In still, dry gas it takes a long time until vapor pressure inside the measurement cell reaches equilibrium with the main gas tank. It is not unusual for the stabilization after installation.

Safety

The DPT145 transmitter delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions:
WARNING
CAUTION
CAUTION
CAUTION
NOTE
modify the unit. Improper modification can damage the product
from
rotection
NOTE
of the dewpoint reading to take several days
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gas volume, not behind
6
User's Guide _______________________________________________________________________

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.
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.

Recycling

Recycle all applicable material.
Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse.
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Chapter 1 _________________________________________________________ General Information

Regulatory Compliances

The Vaisala Multiparameter Transmitter DPT145 for SF6 Gas is in conformity with the provisions of the following EU directive(s):
- EMC-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.
- EN 550022: Information technology equipment – Radio disturbance characteristics – Limits and methods of measurement.

Patent Notice

The Vaisala Multiparameter Transmitter DPT145 for SF6 Gas is protected by, for example, the following patents and their corresponding national rights:
Finnish patent 98861, French patent 6650303, German patent 69418174, Japanese patent 3585973, UK patent 0665303, and U.S. patent 5607564.

Trademarks

BAROCAP® and DRYCAP® are registered trademarks of Vaisala Oyj.
Windows® is a registered trademark of Microsoft Corporation in the United States and/or other countries.
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Software License

This product contains software developed by Vaisala. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group.

Warranty

Visit our Internet pages for more information and our 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.
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Chapter 2 ___________________________________________________________ Product Overview
Parameter
Abbreviation
Metric Unit
Non-Metric Unit
Dewpoint/frost point temperature*
Tdf
ºC
ºF
Dewpoint/frost point temperature*, converted to atmospheric pressure
Tdfatm
ºC
ºF ppm moisture, by volume
H20
ppm
ppm
Pressure, absolute
P
bara
psia
Pressure, normalized to 20 °C (68 °F)
Pnorm
bara
psia Density
Rhoo
kg/m3
kg/m3
Temperature
T
ºC
ºF
CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features, advantages, and the product nomenclature.

Introduction to DPT145

Vaisala Multiparameter Transmitter DPT145 for SF6 Gas is a digital transmitter with a non-isolated RS-485 output. Its compact size makes it well suited for integration into OEM systems.
DPT145 is always delivered with an integrated mechanical adapter: DILO DN20, DILO DN8, ABB Malmkvist, or Alstom G1/2". The connection between the adapter and the transmitter is helium leak tested at the factory.
DPT145 combines online measurement of dewpoint, pressure, and temperature. DPT145 also calculates four other quantities, including SF6 density.
Table 3 Output Parameters of DPT145
* When the dewpoint is below 0 °C, the transmitter outputs frostpoint for Td
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Basic Features and Options

- Utilizes the Vaisala MPS1 multiparameter sensor with Vaisala’s BAROCAP® and DRYCAP® technologies.
- Measurement ranges of measured parameters:
- Dewpoint -50 ... +30 °C (-58 ... +86 °F) Td
- Pressure, absolute 1 ... 12 bar (14.5 ... 174 psi)
- Temperature -40 ... +80 °C (-40 ... +176 °F)
- Measurement is configurable for pure SF6 or mixed gas.
- Non-isolated RS-485 digital output.
- Easy verification of dewpoint measurement with the Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70.
- Delivered with an integrated mechanical adapter that must be specified during ordering. The adapter options are:
- DILO DN20
- DILO DN8
- ABB Malmkvist
- Alstom G1/2"
- Optional accessories:
- Weather shield: necessary for outdoor installations.
- USB service cable for configuration and calibration.
1107-031
Figure 1 DPT145 with DILO DN20 Adapter
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Chapter 2 ___________________________________________________________ Product Overview
1 = Port I: Supply voltage only (optional)
2 = Port II: RS-485 line and supply voltage
3 = Type label
4 = Connection between transmitter body and adapter – do not open
5 = DILO DN20 adapter: 50 mm nut with M45X2 inner thread / DILO DN8 adapter: 32 mm nut with M26X1.5 inner thread
6 = ABB Malmkvist adapter
7 = Alstom G1/2" adapter
8 = Transport protection cap – remove only when ready to install
5
6
7
8
3
4
1
2

Transmitter Parts

1107-033
Figure 2 DPT145 Transmitter Parts and Adapters
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Weather Shield

The transmitter and its connectors are rated IP65. However, installing the transmitter outside without protection is not recommended. The installation should be such that the transmitter is not exposed to direct rain, icing, or solar radiation.
A suitable weather shield is available from Vaisala. The weather shield is designed to clamp over the adapter, and to accommodate the available cable options.
1108-022
Figure 3 Weather Shield
DPT145 is assembled to the weather shield at the factory if the weather shield is ordered with the transmitter. Weather shields are also available separately.
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Chapter 3 _______________________________________________________ Functional Description
CHAPTER 3

FUNCTIONAL DESCRIPTION

This chapter describes the primary application and the sensor technology of DPT145.

Measurement Needs of SF6 Insulation

Sulphur hexafluoride (SF6) is used as an insulating gas in transmission and distribution equipment such as switchgears and circuit breakers. It effectively prevents arcing during switch-offs and protects equipment from failures.
In order to maintain SF6 insulation properties and to reduce the formation of unwanted secondary decomposition products, the amount of water vapor in the gas insulated system (GIS) should be kept to a minimum. Also, the SF6 system needs to be pressure tight for best insulation performance and safe operation of the equipment.
There is always some diffusion of water molecules from high ambient water vapor pressure to low vapor pressure inside the system. The more connection points the higher the diffusion rate. DPT145 is ideally suited to the online monitoring of dewpoint, pressure, and temperature in such a system. Sudden and minor leakages are immediately detected by the direct normalized pressure measurement, while online dewpoint measurement alerts the user to moisture issues.
With online monitoring, on-site visits can be kept to a minimum. The long calibration interval of DPT145 means practically service-free operation.
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Sensor Technology

MPS1 Multiparameter Sensor

DPT145 combines Vaisala’s proven DRYCAP® sensor technology for industrial dewpoint measurement with BAROCAP® pressure sensor technology. Both technologies are integrated on the same MPS1 multiparameter sensor element, allowing for a highly compact and versatile transmitter.
1108-021
Figure 4 MPS1 Sensor
There are several important advantages in using a transmitter with an integrated sensor:
- Reduces installation work and cost.
- Improves the leak tightness of the system as connection points are minimized.
- Enables online monitoring of all supported parameters.

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. The lasting performance is achieved with microprocessor technology and software that automatically performs self-diagnostic functions in addition to the normal dewpoint measurement. The self-diagnostic procedures that are conducted are called auto-calibration and sensor purge.
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Chapter 3 _______________________________________________________ Functional Description
Auto-Calibration
The auto-calibration feature of the MPS1 multiparameter sensor is an automatic procedure which greatly reduces the possible drift in the dry end of the dewpoint measurement. It is performed at one hour intervals, and when the power is switched on. 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. During the auto­calibration the transmitter outputs the dewpoint value prior to the procedure.
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. These criteria include, for example, a stable enough moisture level in the measured atmosphere. If the conditions are not fulfilled, the auto­calibration function is postponed until satisfactory conditions are reached.
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 twice a day, and five minutes after 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 of the sensor due to the very linear behavior of the polymer technology.

BAROCAP® Technology

The BAROCAP® silicon capacitive absolute pressure sensor was developed by Vaisala for barometric pressure measurement applications. The BAROCAP® sensor has excellent hysteresis and repeatability characteristics, low temperature dependence, and a very good long-term stability. The ruggedness of the BAROCAP® sensor is outstanding and the sensor is resistant to mechanical and thermal shocks. The pressure measurement of the MPS1 multiparameter sensor is based on an advanced RC oscillator and reference capacitors against which the capacitive pressure sensor is continuously measured. The microprocessor of the transmitter performs compensation for pressure linearity and temperature dependence.
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