Vaisala HMT360N User Manual
USER'S GUIDE
Vaisala HUMICAP® Dewpoint and Temperature
Transmitter Series HMT360
M210744EN-C
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2010
No part of this manual may be reproduced in any form or by any means,
electronic or mechanical (including photocopying), nor may its contents
be communicated to a third party without prior written permission of the
copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding
obligations for Vaisala towards the customer or end user. All legally
binding commitments and agreements are included exclusively in the
applicable supply contract or Conditions of Sale.
________________________________________________________________________________
Table of Contents
CHAPTER 1
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Contents of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Version Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . .11
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Regulatory Compliances . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
License Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
CHAPTER 2
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Introduction to HMT360 . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Output Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Probe Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
CHAPTER 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
General Installation Instructions . . . . . . . . . . . . . . . . . . . . .19
Mounting the Probe Cable in Gas Group IIC Spaces . . . .19
Selecting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Checking the Temperature Reading . . . . . . . . . . . . . . . . .20
Mounting the Transmitter Housing . . . . . . . . . . . . . . . . . . .21
Probe Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
HMP362 Small Pressure-Tight Probe . . . . . . . . . . . . . . . .24
HMP364 for High-Pressure Applications . . . . . . . . . . . . . .27
HMP368 for Pressurized Pipelines or Moisture in Liquids .29
Tightening the Clasp Nut . . . . . . . . . . . . . . . . . . . . . . . 31
Installing the HMP368 Probe Through a Ball
Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Installation in Hazardous Locations . . . . . . . . . . . . . . . . . .36
US and Canadian Requirements. . . . . . . . . . . . . . . . . 36
European Requirements . . . . . . . . . . . . . . . . . . . . . . . 36
CATEGORY 1 (Zone 0) . . . . . . . . . . . . . . . . . . . . . 36
VAISALA________________________________________________________________________ 1
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CATEGORY 2 or 3 (Zone 1 or 2) . . . . . . . . . . . . . . 36
Maximum Cable Resistance Calculation for the
Barrier (Vaisala Order Code: 210664) . . . . . . . . . . . . . 37
HMT360 Connected to a Galvanic Isolator . . . . . . . . . 38
HMT360 Connected to a Zener Barrier . . . . . . . . . . . . 39
Examples of Connections . . . . . . . . . . . . . . . . . . . . . . 41
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
CHAPTER 4
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Local Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Power ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
DIP Switch Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Display/Keypad Commands . . . . . . . . . . . . . . . . . . . . . . . .48
Setting the Pressure for Calculations. . . . . . . . . . . . . . 48
Selecting Output Quantities . . . . . . . . . . . . . . . . . . . . . 49
Upper Half of Display . . . . . . . . . . . . . . . . . . . . . . . 49
Lower Half of Display . . . . . . . . . . . . . . . . . . . . . . . 50
Selecting Analog Outputs . . . . . . . . . . . . . . . . . . . . . . 50
Scaling Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . 51
Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Serial Communication Settings . . . . . . . . . . . . . . . . . . . . .53
Setting the Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . .53
ASEL Selecting Analog Outputs . . . . . . . . . . . . . . . . . 53
S Scaling Analog Outputs . . . . . . . . . . . . . . . . . . . . . . 54
Adjustment Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .55
CT Temperature Adjustment . . . . . . . . . . . . . . . . . . . . 55
Output Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
ITEST Testing Analog Outputs . . . . . . . . . . . . . . . . . . 56
SEND Outputting Measurement Values. . . . . . . . . . . . 57
R Activating Continuous Output. . . . . . . . . . . . . . . . . . 57
S Stopping Continuous Output . . . . . . . . . . . . . . . . . . 57
INTV Setting Output Interval . . . . . . . . . . . . . . . . . . . . 57
PRES Setting Ambient Pressure for Calculations . . . . 58
FILT Output Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . .59
RESET Transmitter Reset . . . . . . . . . . . . . . . . . . . . . . 59
CHAPTER 5
MEASURING AT OVERPRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Pressure Regulator Recommended . . . . . . . . . . . . . . . . . .62
CHAPTER 6
CALIBRATION AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Factory Calibration and Adjustment . . . . . . . . . . . . . . . . . .63
Removing the Electronics Unit . . . . . . . . . . . . . . . . . . . . . .64
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Calculating Correspondence of Current Values and
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Output Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
One-Point Temperature Adjustment . . . . . . . . . . . . . . . . . .67
ACAL Analog Output Calibration . . . . . . . . . . . . . . . . . . . .68
CHAPTER 7
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Periodical Checking and Cleaning . . . . . . . . . . . . . . . . . . .69
Transmitter Housing and Probe . . . . . . . . . . . . . . . . . . . . .69
Sintered Steel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Sensor Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
CHAPTER 8
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Analog Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
CHAPTER 9
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Temperature (+ Operating Pressure Ranges) . . . . . . . . . .75
Moisture in Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Dewpoint Measurement. . . . . . . . . . . . . . . . . . . . . . . . 76
Calculated Variables Available (Typical Ranges) . . . . . . .77
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Classification with Current Outputs . . . . . . . . . . . . . . . . . .78
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . .80
APPENDIX A
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Transmitter Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
HMP362 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
HMP364 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
HMP368 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Rain Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Protection Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
APPENDIX B
WIRING FOR INTRINSICALLY SAFE OPERATION, FM . . . . . . . . . . . . .87
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APPENDIX C
WIRING FOR INTRINSICALLY SAFE OPERATION, CSA . . . . . . . . . . . .89
APPENDIX D
CERTIFICATES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
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List of Figures
Figure 1 HMT360 for Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Figure 2 Probe Options for HMT360 for Natural Gas. . . . . . . . . . . . . . .17
Figure 3 Measurement Error at 100 %RH . . . . . . . . . . . . . . . . . . . . . . .21
Figure 4 Transmitter Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 5 Parts of the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 6 HMP362 Probe and HMP302SC Sampling Cell Dimensions. .24
Figure 7 HMP362 Installation (without Sampling Cell). . . . . . . . . . . . . .25
Figure 8 Optional Sampling Cell HMP302SC. . . . . . . . . . . . . . . . . . . . .26
Figure 9 HMP364 Probe Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 10 Marking Nut and Fitting Screw. . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 11 Cleaning the Tightening Cone . . . . . . . . . . . . . . . . . . . . . . . . .29
Figure 12 HMP368 Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 13 Sealing of Fitting Body into Process . . . . . . . . . . . . . . . . . . . .31
Figure 14 Tightening the Clasp Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Figure 15 Installing the HMP368 Probe Through a Ball Valve Assembly 33
Figure 16 HMT360 Connected to Galvanic Isolator. . . . . . . . . . . . . . . . .39
Figure 17 HMT360 Connected to a Zener Barrier . . . . . . . . . . . . . . . . . .40
Figure 18 STAHL 9160/13-11-11 (Galvanic Isolator). . . . . . . . . . . . . . . .41
Figure 19 STAHL 9001/51-280-091-141 (Zener Barrier) . . . . . . . . . . . . .42
Figure 20 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Figure 21 Local Display/Keypad Interface . . . . . . . . . . . . . . . . . . . . . . . .46
Figure 22 DIP Switch Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Figure 23 Detaching the Electronics Unit with Probe for Calibration
and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Figure 24 Connecting Power Supply and Multimeter for Calibration . . . .65
Figure 25 Sensor Element is Located under the Filter. . . . . . . . . . . . . . .71
Figure 26 Effect of Process Temperature on Dewpoint Measurement
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Figure 27 VTT IECEx Certificate Page 1/4. . . . . . . . . . . . . . . . . . . . . . . .92
Figure 28 VTT IECEx Certificate Page 2/4. . . . . . . . . . . . . . . . . . . . . . . .93
Figure 29 VTT IECEx Certificate Page 3/4. . . . . . . . . . . . . . . . . . . . . . . .94
Figure 30 VTT IECEx Certificate Page 4/4. . . . . . . . . . . . . . . . . . . . . . . .95
Figure 31 VTT ATEX 028X Certificate Page 1/2 . . . . . . . . . . . . . . . . . . .96
Figure 32 VTT ATEX 028X Certificate Page 2/2 . . . . . . . . . . . . . . . . . . .97
Figure 33 VTT ATEX 028X Certificate Schedule . . . . . . . . . . . . . . . . . . .98
Figure 34 VTT ATEX 023X Certificate Page 1/2 . . . . . . . . . . . . . . . . . . .99
Figure 35 VTT ATEX 023X Certificate Page 2/2 . . . . . . . . . . . . . . . . . .100
Figure 36 FM Certificate of Compliance page 1/3 . . . . . . . . . . . . . . . . .101
Figure 37 FM Certificate of Compliance page 2/3 . . . . . . . . . . . . . . . . .102
Figure 38 FM Certificate of Compliance page 3/3 . . . . . . . . . . . . . . . . .103
Figure 39 CSA Certificate of Compliance. . . . . . . . . . . . . . . . . . . . . . . .104
Figure 40 TIIS Certificate of Compliance . . . . . . . . . . . . . . . . . . . . . . . .105
Figure 41 PCEC Conformity Certificate . . . . . . . . . . . . . . . . . . . . . . . . .106
VAISALA________________________________________________________________________ 5
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List of Tables
Table 1 Manual Revisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Table 2 Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Table 3 Output Quantities for HMT360 for Natural Gas . . . . . . . . . . . . . .16
Table 4 HMP368 Probe Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Table 5 Pressure Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Table 6 Serial Communications Settings . . . . . . . . . . . . . . . . . . . . . . . . .53
Table 7 Pressure Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Table 8 Temperature Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Table 9 Dewpoint Measurement Specifications . . . . . . . . . . . . . . . . . . . .76
Table 10 Calculated Variables Specifications. . . . . . . . . . . . . . . . . . . . . . .77
Table 11 Output Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Table 12 General Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Table 13 Probe Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Table 14 Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
VAISALA________________________________________________________________________ 7
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Chapter 1 ________________________________________________________ General Information
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the product.
About This Manual
This manual provides information for installing, operating, and
maintaining the Vaisala HUMICAP® Dewpoint and Temperature
Transmitter Series HMT360 for Natural Gas.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information: This chapter provides general
notes for the manual and the product.
- Chapter 2, Product Overview: This chapter introduces the features,
advantages, and the product nomenclature.
- Chapter 3, Installation: This chapter provides you with information
that is intended to help you install this product.
- Chapter 4, Operation: This chapter contains information that is
needed to operate this product.
- Chapter 5, Measuring at Overpressure: This chapter provides you
with important information concerning measurement in conditions
with pressure higher than the normal atmospheric pressure.
VAISALA________________________________________________________________________ 9
User's Guide ______________________________________________________________________
- Chapter 6, Calibration and Adjustment: This chapter contains
instructions for checking the calibration and adjusting this product.
- Chapter 7, Maintenance: This chapter provides information that is
needed in basic maintenance of the product.
- Chapter 8, Troubleshooting: This chapter describes common
problems, their probable causes and remedies, and contact
information.
- Chapter 9, Technical Data: This chapter provides technical data of
the product.
- Appendix A, Dimensions: This Appendix contains parts drawings
of the transmitter housing, probes and some transmitter mounting
accessories with metric and nonmetric dimensions specified.
- Appendix B, Wiring for Intrinsically Safe Operation, FM: This
appendix contains the wiring diagram for intrinsically safe
operation approved by Factory Mutual (FM).
- Appendix C, Wiring for Intrinsically Safe Operation, CSA: This
appendix contains the wiring diagram for intrinsically safe
operation approved by the Canadian Standards Association (CSA).
- Appendix D, Certificates: This Appendix contains copies of the
EXi intrinsically safe certificates issued for the HMT360 series.
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Chapter 1 ________________________________________________________ General Information
Version Information
Table 1 Manual Revisions
Manual Code Description
M210744EN-C This manual. April 2010 - Updated
Appendix Certificates on page 91.
M210744EN-B Previous version. September 2007 -
New copies of certificates added in
Appendix Certificates on page 91.
Updated list of options and
accessories.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M210185EN Humidity Calibrator HMK15 User's
Guide
WARNING
CAUTION
NOTE
Documentation Conventions
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.
VAISALA_______________________________________________________________________ 11
User's Guide ______________________________________________________________________
Safety
The Series HMT360 Transmitter delivered to you has been tested for
safety and approved as shipped from the factory. Note the following
precautions:
WARNING
CAUTION
Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
Do not modify the unit. Improper modification can damage the
product or lead to malfunction.
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 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.
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Chapter 1 ________________________________________________________ General Information
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.
Recycling
Regulatory Compliances
The certifications that have been granted to the HMT360 Series, and the
accompanying safety factors, are listed in section Classification with
Current Outputs on page 78.
Trademarks
Copies of the certificates and wiring diagrams are provided in the
following appendices:
- Appendix B, Wiring for Intrinsically Safe Operation, FM, on page
87
- Appendix C, Wiring for Intrinsically Safe Operation, CSA, on
page 89
- Appendix D, Certificates, on page 91
Vaisala HUMICAP® is a registered trademark of Vaisala Oyj.
VAISALA_______________________________________________________________________ 13
User's Guide ______________________________________________________________________
License Agreement
All rights to any software are held by Vaisala or third parties. The
customer is allowed to use the software only to the extent that is
provided by the applicable supply contract or Software License
Agreement.
Warranty
For certain products Vaisala normally gives a limited one-year
warranty. Visit our Internet pages for more information and our
standard warranty terms and conditions: www.vaisala.com/services/
warranty.html.
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
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages, and the product
nomenclature.
Introduction to HMT360
Vaisala HUMICAP® Dewpoint and Temperature Transmitter Series
HMT360 for Natural Gas contains reliable, microprosessor-based twowire instruments for measuring moisture in natural gas in hazardous
areas.
VAISALA_______________________________________________________________________ 15
User's Guide ______________________________________________________________________
0606-004
Figure 1 HMT360 for Natural Gas
WARNING
In hazardous environments, the transmitters must always be connected
via galvanic isolators or Zener barriers.
Output Quantities
Vaisala HUMICAP® Dewpoint and Temperature Transmitter Series
HMT360 for Natural Gas comes equipped with a local display and with
one or two current output channels.
Available output quantities are listed in the table below:
Table 3 Output Quantities for HMT360 for Natural Gas
Character Quantity Abbreviation
1 temperature T
2 dewpoint temperature Td
6 volume concentration ppmv
A water content w
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Chapter 2 __________________________________________________________ Product Overview
Probe Options
The HMT360 series has various options for probes and cable lengths
(2 m, 5 m and 10 m). The available probe types are presented in the
figure below.
0603-035
Figure 2 Probe Options for HMT360 for Natural Gas
The following numbers refer to Figure 2 on page 17:
1 = HMP362 probe for pressurized spaces up to 167 bars
2 = HMP364 probe for pressurized spaces up to 100 bars
3 = HMP368 probe for installations in pressurized pipelines up to
40 bars; features a pressure-tight sliding clasp nut
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User's Guide ______________________________________________________________________
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Chapter 3 _______________________________________________________________ Installation
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install this product.
General Installation Instructions
Mounting the Probe Cable in Gas Group IIC Spaces
NOTE
The following applies only to installation within the EU!
The following instructions shall be followed to fulfil the specifications
of the EN50284 for nonconductive layer of the probe cable:
- Never mount or handle the probe cable when hazardous gases are
present.
- For achieving a conductive shield, cover the probe cable with
conductive material like metal or conductive tape or mount the probe
cable in a metal conduit.
- Assure that the conductive shield fulfils requirements of the standard
EN50284 (resistance less than 1 G) and make sure that it can not
come loose in any operation situation.
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User's Guide ______________________________________________________________________
WARNING
During the installation work of the probes in gas group IIC areas
(requiring category I devices), it has to be guaranteed that even in fault
cases sparks generated by impacts or friction on the surface of the
housing can never occur.
Selecting Location
Select a place with stable conditions for mounting the transmitter. Do
not expose the transmitter to direct sunlight or rain. A rain shield is
available and it is recommended for direct outdoor installations. When
mounting the probe, select a place representing the process conditions.
Checking the Temperature Reading
The actual temperature of the process can be measured with a reference
instrument to be compared with the transmitter reading. The heat
transfer is less evident if you remove the protective filter of the sensor
for a short-term test. However, never use the sensor long periods
without the filter as this may cause a faster contamination of the sensor.
The transmitter fulfils the specified EMC regulations with the
protective filter on the probe.
In humidity measurement and especially in calibration and adjustment
it is essential that temperature of the probe and measuring environment
is the same. Even a small difference in temperature between the
environment and the probe causes an error. As the curve below shows,
if the temperature is +20 °C and the relative humidity 100 %RH, a
difference of ±1 °C between the environment and the probe causes an
error of ±6 %RH.
The graph below illustrates the measurement error at 100 %RH when
the difference between the ambient and sensor temperature is 1 °C.
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Chapter 3 _______________________________________________________________ Installation
0507-036
Figure 3 Measurement Error at 100 %RH
Mounting the Transmitter Housing
1. Attach the mounting plate to the wall with 4 screws.
2. Press down the transmitter so that it slides along the rails of the
mounting plate.
3. Fasten the transmitter to the mounting plate with the Allen screw
(3 mm Allen key provided).
The probe can be detached and replaced when needed by simply
unfastening the two Allen screws.
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User's Guide ______________________________________________________________________
0605-049
Figure 4 Transmitter Mounting
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Chapter 3 _______________________________________________________________ Installation
0605-050
Figure 5 Parts of the Transmitter
The following numbers refer to Figure 5 on page 23:
1 = Electronics unit
2 = Probe; including a part of the measurement electronics (for
example, calibration memory)
3 = Flat cable
4 = Transmitter base
5 = Grounding terminal
6 = Protective covers
7 = Cable glands
8 = Sensor cable
9 = RS232C connector
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User's Guide ______________________________________________________________________
Probe Mounting
CAUTION
Do not unsolder and then resolder the probe cable from and to the
printed board during installation.
Do not shorten or lengthen the probe cable.
These procedures may alter the humidity calibration of the transmitter.
HMP362 Small Pressure-Tight Probe
The HMP362 probe is a small pressure-tight probe equipped with an
installation flange. It is suitable for dewpoint measurements in natural
gas. When sampling in pressurized processes, the sampling cell
HMP302SC is available as an optional accessory.
0603-014
Figure 6 HMP362 Probe and HMP302SC Sampling Cell
Dimensions
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Chapter 3 _______________________________________________________________ Installation
min. 2-3 mm (0.1")
min. ø 60.33 (2")
ø 12.3 (31/64")
ø
2
4
.
5
(
3
1
/
3
2
"
)
HMP362 Probe
Screws, hexagon socket head (provided)
Threaded sleeve
(not provided)
O-ring (provided)
Process pipe
or chamber
VAISALA_______________________________________________________________________ 25
0603-012
Figure 7 HMP362 Installation (without Sampling Cell)
User's Guide ______________________________________________________________________
1
2
3
4
5
6
0505-269
Figure 8 Optional Sampling Cell HMP302SC
The following numbers refer to Figure 8 on page 26:
1=Gas in
2 = Probe
3 = Gas out
4 = Probe cable
5 = Sampling cell
6=Clamp
CAUTION
In pressurized processes it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.
NOTE
When HMP362 is installed in a process with a pressure differing from
normal atmospheric pressure, please enter the pressure value of the
process (in bara) into the transmitter memory, see section Setting the
Pressure for Calculations on page 48.
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Chapter 3 _______________________________________________________________ Installation
HMP364 for High-Pressure Applications
The probe is provided with a nut, a fitting screw and a sealing washer.
Keep the fitting screw and the nut in place on the body of the probe
during handling to prevent damage to the highly polished surface of the
probe. Follow the instructions below to achieve a leak-tight assembly.
CAUTION
In pressurized processed it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.
1. Remove the fitting screw from the nut and the probe.
2. Fasten the fitting screw to the chamber wall with a sealing washer.
Tighten the fitting screw into the threaded sleeve with a torque
spanner. The tightening torque is 150 ± 10 Nm (110 ± 7 ft-lbs).
3. Insert the body of the probe into the fitting screw and tighten the
nut manually to the fitting screw.
4. Mark both the fitting screw and the nut hex.
5. Tighten the nut a further 30º (1/12) turn or if you have a torque
spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).
6. Clean and grease the tightening cone of the fitting screw after every
tenth detachment. Change the sealing washer every time the fitting
screw is detached. Use high-vacuum grease, for example Dow
Corning, or a similar grease.
NOTE
VAISALA_______________________________________________________________________ 27
When retightening the nut after detachment the nut must be tightened
without increased effort.
User's Guide ______________________________________________________________________
0505-272
Figure 9 HMP364 Probe Mounting
The following numbers refer to Figure 9 on page 28:
1 = Tightening cone
2=Nut
3 = Fitting screw, M22×1.5 or NPT 1/2"
4 = Sealing washer
5 = Probe; ø12 mm
0505-273
Figure 10 Marking Nut and Fitting Screw
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