Vaisala HMT360N User Manual

USER'S GUIDE

Vaisala HUMICAP® Dewpoint and Temperature

Transmitter Series HMT360

M210744EN-C

PUBLISHED BY

Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
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

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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

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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.

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- 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.

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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.

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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

VAISALA_______________________________________________________________________ 17

User's Guide ______________________________________________________________________

18 __________________________________________________________________ M210744EN-C

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.

VAISALA_______________________________________________________________________ 19

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.

20 __________________________________________________________________ M210744EN-C

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.

VAISALA_______________________________________________________________________ 21

User's Guide ______________________________________________________________________

0605-049

Figure 4 Transmitter Mounting

22 __________________________________________________________________ M210744EN-C

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

VAISALA_______________________________________________________________________ 23

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

24 __________________________________________________________________ M210744EN-C

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.

26 __________________________________________________________________ M210744EN-C

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

28 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

0505-274

Figure 11 Cleaning the Tightening Cone

The following numbers refer to Figure 11 on page 29:
1 = Fitting screw
2 = Sealing washer
3 = Tightening cone
4 = Clean cotton stick

CAUTION

NOTE

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.

When HMP364 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.

HMP368 for Pressurized Pipelines or Moisture in Liquids

Due to the sliding fit the HMP368 is easy to install into and remove
from a pressurized process. The probe is especially suitable for
measurements inside pipelines. See section Installing the HMP368

Probe Through a Ball Valve Assembly on page 32.

CAUTION

VAISALA_______________________________________________________________________ 29

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.

User's Guide ______________________________________________________________________

NOTE

When HMP368 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.

0606-156

Figure 12 HMP368 Probe

The following numbers refer to Figure 12 on page 30:
1 = Clasp nut, 24 mm hex nut
2 = Fitting body, 27 mm hex nut

The following two fitting body options are available:

- Fitting Body ISO1/2 solid structure

- Fitting Body NPT1/2 solid structure

Table 4 HMP368 Probe Dimensions

Probe Type Probe Length Adjustment Range

Standard 178 mm 120 mm
Optional 400 mm 340 mm

30 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

CAUTION

Take care not to damage the probe body. A damaged body makes the
probe head less tight and may prevent it from going through the clasp
nut.

0507-025

Figure 13 Sealing of Fitting Body into Process

Tightening the Clasp Nut

1. Adjust the probe to a suitable depth according to the type of

installation.

2. Tighten the clasp nut first manually.

3. Mark the fitting screw and the clasp nut.

4. Tighten the nut a further 50 ... 60° (ca. 1/6 turn) with a fork

spanner. If you have a suitable torque spanner, tighten the nut to 45
± 5 Nm (33 ± 4 ft-lbs).

VAISALA_______________________________________________________________________ 31

User's Guide ______________________________________________________________________

NOTE

0505-276

Figure 14 Tightening the Clasp Nut

The following numbers refer to Figure 14 on page 32:
1 = Probe
2 = Clasp nut
3 = Fitting screw
4=Pen

Take care not to tighten the clasp nut more than 60° to avoid
difficulties when opening it.

Installing the HMP368 Probe Through a Ball Valve Assembly

The ball valve installation kit (Vaisala order code: BALLVALVE-1) is
preferred when connecting the probe to a pressurized process or
pipeline. Use the ball valve set or a 1/2" ball valve assembly with a ball
hole of ø14 mm or more. If you install the probe (ø12 mm) in a process
pipe, please note that the nominal size of the pipe must be at least 1 inch
(2.54 cm). Use the manual press handle to press the probe into the
pressurized (< 10 bar) process or pipeline.

32 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

NOTE

0505-277

Figure 15 Installing the HMP368 Probe Through a Ball Valve

Assembly

The numbers below refer to Figure 15 on page 33:
1 = Manual press tool
2 = Handle of the ball valve
3 = Probe
4 = Process chamber/pipeline
5 = Groove on the probe indicating the upper adjustment limit
6=Filter
7 = Ball of the ball valve

The probe can be installed in the process through the ball valve
assembly provided that the process pressure is less than 10 bar. This
way, the process does not have to be shut down when installing or
removing the probe. However, if the process is shut down before
removing the probe, the process pressure can be max. 20 bar.

NOTE

When measuring temperature dependent quantities make sure that the
temperature at the measurement point is equal to that of the process,
otherwise the moisture reading may be incorrect.

VAISALA_______________________________________________________________________ 33

User's Guide ______________________________________________________________________

Follow the steps below to install the HMP368 probe through a ball valve
assembly. After the installation, the probe should be sitting in the
process chamber or pipeline as shown in Figure 15 on page 33.

1. Shut down the process if the process pressure is more than 10 bars.
If the pressure is lower there is no need to shut down the process.

2. Close the ball valve.

3. Seal the threads on the fitting body; refer to Figure 13 on page 31.

4. Attach the fitting body to the ball valve and tighten it.

5. Slide the clasp nut of the probe toward the filter, as far as it will go.

6. Insert the probe to the fitting body, and manually tighten the clasp
nut to the fitting body.

7. Open the ball valve.

8. Push the probe through the ball valve assembly into the process. If
the pressure is high, use the pressing handle that is provided with
the probe. If you push the probe hard without using the handle, you
may damage the cable.

NOTE

Note that the probe must be pushed so deep that the filter is
completely inside the process flow.

9. Mark the fitting screw and the clasp nut.

10. Tighten the clasp nut with a fork spanner a further 50 ... 60º (ca. 1/
6 turn). If you have a suitable torque spanner, tighten the nut to max
45 ± 5 Nm (33 ± 4 ft-lbs). Refer to Figure 14 on page 32.

Take care not to tighten the clasp nut more than 60° to avoid
difficulties when opening it.

If you wish to remove the probe from the process, note that you have to
pull the probe out far enough. You cannot close the valve if the groove
on the probe body is not visible.

34 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

Electrical Connections

Refer to local requirements regarding cabling, grounding and galvanic
isolator or barrier connections.

WARNING

WARNING

Connect the transmitter always via galvanic isolators or Zener barriers
in hazardous environments.

Be sure that the main power switch of the transmitter is set off before
making any electrical installations in hazardous areas.

1. Open the transmitter cover and remove the protective cover of the
transmitter base.

2. Thread the power supply wires through the cable gland, see Figure

5 on page 23.

3. Connect the unpowered power supply wires to the connectors:
Ch 1 (humidity) and Ch 2 (temperature). Both channels require an
own power supply.

4. Replace the protective cover. Turn the transmitter on ON with the
ON/OFF switch, see Figure 23 on page 64.

5. Close the cover. The transmitter is ready for use.

NOTE

As Ch 1 is a main output, the transmitter does not operate if only Ch 2
is connected (Ch 2 is optoisolated from transmitter electronics).

When using the transmitter in hazardous locations, the use of galvanic
isolators or barriers is essential. The following barrier & isolator are
available in Vaisala: barrier No. 210664 (STAHL 9001/51-280-091-

141) and galvanic isolator No. 212483 (STAHL 9160/13-11-11).

Examples of connections and more information on installation in
hazardous locations is given in section Examples of Connections on

page 41.

VAISALA_______________________________________________________________________ 35

User's Guide ______________________________________________________________________

Installation in Hazardous Locations

US and Canadian Requirements

USA (FM): Wiring for intrinsically safe operation is shown in

Appendix B, Wiring for Intrinsically Safe Operation, FM, on page 87.

Canada (CSA): Wiring for intrinsically safe operation is shown in

Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page 89.

European Requirements

CATEGORY 1 (Zone 0)

HMT360 has to be connected to Exia-certified associated apparatus
with galvanic isolation, gas group IIB or IIC.

NOTE

NOTE

If both analog outputs are in use, the Ch 1 (-) and Ch 2 (-) must be short
circuited (see Figure 18 on page 41).

CATEGORY 2 or 3 (Zone 1 or 2)

HMT360 has to be connected either to a Zener barrier or galvanic
isolator

If both analog outputs are in use with a galvanic isolator, the Ch 1 (-)
and Ch 2 (-) must be short circuited (see Figure 18 on page 41).

Figure 16 on page 39 and Figure 17 on page 40 present examples of

galvanic isolators and Zener barrier connections (only Ch 1 connected).

36 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

Maximum Cable Resistance Calculation for the Barrier (Vaisala Order Code: 210664)

General specifications of HMT360:

Supply voltage Uin = 24 V (12 ... 35 V)
Maximum current I
Minimum operating voltage for

= 20 mA

out

U

= 12 V (15 V with serial port)

min

HMT360

Stahl 9001/51-280-091-141 (values taken from the specifications):

Rated operating voltage U
Transmitter supply voltage U

= 20 ... 35 V

N

= UN - 9.5 V, when

S

UN 23.5 V
or US = 14 V, when UN 23.5 V

Maximum load RL 350 

Calculation of the maximum cable length from barrier to
transmitter:

Cable resistance (as an example) R

= 0.085 /m/core (2 ×

cable

0.085 /m/pair)

If assuming that the operating voltage would be  24 V, the maximum
acceptable voltage drop U

U

= US - U

drop

U

= 14 V - 12 V = 2 V

drop

min

in cables is:

drop

We also know that:
I

= 20 mA

out

and that total resistance of the cable R

cabletot

multiplied with the total maximum length of the cables l

R

VAISALA_______________________________________________________________________ 37

cabletot

= R

cable

× l

max

is cable resistance R

:

max

cable

User's Guide ______________________________________________________________________

HAZARDOUS AREA SAFE AREA

a) current signal controller

I

From these facts the following equation can be formed:
U

drop

= R

cabletot

× I

out

NOTE

2 = 2 × 0.085 /m × l

l

= 2 V / (20 mA × 2 × 0.085 /m)

max

l

= 588 m = 1930 ft, maximum cable length.

max

× 20 mA

max

If longer cable length is required, use of the galvanic isolators is
recommended if possible.

HMT360 Connected to a Galvanic Isolator

0505-278

38 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

HAZARDOUS AREA SAFE AREA

b) voltage signal controller

a) current signal controller

HAZARDOUS AREA SAFE AREA

0505-279

Figure 16 HMT360 Connected to Galvanic Isolator

HMT360 Connected to a Zener Barrier

0505-280

VAISALA_______________________________________________________________________ 39

User's Guide ______________________________________________________________________

0505-281

Figure 17 HMT360 Connected to a Zener Barrier

40 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

Examples of Connections

0505-282

Figure 18 STAHL 9160/13-11-11 (Galvanic Isolator)

VAISALA_______________________________________________________________________ 41

User's Guide ______________________________________________________________________

0505-283

Figure 19 STAHL 9001/51-280-091-141 (Zener Barrier)

Grounding

When grounding the transmitter, follow the local requirements. Use at
least 4 mm2 grounding cable when grounding the transmitter or barrier.

Note that the allowed resistance between barrier and system ground
must be less than 1 ohm. Use ground terminal located inside or outside
of transmitter Figure 20 on page 43:

42 __________________________________________________________________ M210744EN-C

Chapter 3 _______________________________________________________________ Installation

HAZARDOUS AREA SAFE AREA

0505-284

Figure 20 Grounding

VAISALA_______________________________________________________________________ 43

User's Guide ______________________________________________________________________

44 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

CHAPTER 4

OPERATION

This chapter contains information that is needed to operate this product.

Local Interface

HMT360 transmitter has four pushbuttons located on the housing cover.
The display/keypad commands (see Display/Keypad Commands on

page 48) can be used to scale the outputs and select output quantities.

The measurement results are shown on the display.
The keypad pushbuttons are indicated (from left to right) as C, Up, Dn,

and E (see Figure 21 on page 46):

VAISALA_______________________________________________________________________ 45

User's Guide ______________________________________________________________________

0606-155

Figure 21 Local Display/Keypad Interface

WARNING

Power ON/OFF

Open the transmitter cover and flip the internal power switch to position
ON (up), see Figure 23 on page 64.

When the transmitter is turned on, the existing pressure setting appears
on the display; the default setting is 1 bara (15 psia). After this,

measurement readings appear on the display. The analog output signals
can be read from the system or load resistor.

Avoid static discharge. Always use a wet cloth for wiping the display.

To modify the pressure setting, turn the internal Calibration Enabled/
Disabled DIP switch of the transmitter to position Enabled (up). Adjust
the pressure reading with buttons Up and Dn on the display cover; the
adjustment step is 0.5 bar

complete the pressure setting, turn the DIP switch back to position
disabled (down). If the pressure setting is not modified, the
measurement readings appear automatically on the display after 60
seconds.

). Acknowledge the value with button E. To

a

46 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

DIP Switch Functions

The table below is also printed on the protection board:

NOTE

0505-285

Figure 22 DIP Switch Functions
1: Analog output test on/off

If you turn the switch to on position (up), you can force the outputs to
states 4 mA, 12 mA and 20 mA by pressing buttons Up and Dn on the
cover. Outputs return to normal mode when switch is turned down.

2: Calibration Disabled/Enabled

The EEPROMs are write protected. If this switch is in the disabled
position (down), it does not allow any calibrations or scalings.

Keep this switch always in the disabled position during normal use of
the transmitter.

3 and 4: Calibration rh, t, analog

With these combinations you can perform relative humidity,
temperature or analog output calibrations with a multimeter or with the
transmitter display unit. Turn the DIP switches to the desired position
according to the table printed on the protective cover.

VAISALA_______________________________________________________________________ 47

User's Guide ______________________________________________________________________

5: Output quantities

Determines whether the output units are metric (down) on non-metric.

6, 7 and 8: Select output quantities

With the three DIP switches on the right, you can select the output
quantities according to the table printed on the right side of the
protective cover. Note that only the ordered quantities can be selected.
The special option gives you the choice of setting any ordered quantity
to each channel.

NOTE

NOTE

Always restore the DIP switch settings after having tested the analog
outputs or performing the calibration.

Display/Keypad Commands

Chapter 6, Calibration and Adjustment, on page 63 describes

separately display/keypad commands for calibration and adjustment.

Setting the Pressure for Calculations

In dewpoint transmitters, the process pressure in the measurement point
is required to achieve the specified accuracy.

To modify the pressure settings, turn the internal Calibration Enabled/
Disabled DIP switch of the transmitter to position Enabled (up). Press
button C on the display cover: text "SCAL" appears on the display.
Then press button E until the following display appears (the numeric
value is always the existing setting, in this example 1.0):

0505-087

Adjust the pressure reading with buttons Up and Dn. Acknowledge the
value with button E. To complete the pressure setting, turn the dip
switch back to position disabled (down).

48 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

See the pressure conversion table below:

Table 5 Pressure Conversion Chart

FROM hPa (mbar) psi bar MPa

hPa (mbar) 1 68.95 1000 10000

TO psi 0.0145 1 14.5 145

bar 0.001 0.06895 1 10
MPa 0.0001 0.006895 0.1 1

Example:

200 psi = 200 × 68.95 = 13790 hPa (mbar)

Selecting Output Quantities

Two quantities are shown on the LCD. The upper half of the display
shows the moisture, whereas the lower half is reserved for the
temperature reading.

Upper Half of Display

To select between metric/non metric output quantities, use the output
quantities metric/nonmetric. DIP switch is in the metric (down)
position, the available quantities are dewpoint temperature (Td °C),

volume concentration (ppm), and water content in mg/m3 (w).
When the DIP switch is in the non metric (up) position, the available

quantities are dew/frost point temperature (Td °F), volume
concentration (ppm

), and water content in lb/mmscf (w).

v

To modify the displayed quantity, turn the Calibration Enabled/
Disabled DIP switch of the transmitter to position Enabled (up). Select
the required quantity with button Up on the display cover, and
acknowledge the value with button E. To complete the selections, turn
the DIP switch back to position disabled (down).

Character Quantity Abbreviation Metric Unit Nonmetric Unit

1 temperature T °C °F
2 dewpoint

temperature

6 volume

concentration

Td °C °F

ppmv ppm

v

ppm

v

VAISALA_______________________________________________________________________ 49

User's Guide ______________________________________________________________________

Character Quantity Abbreviation Metric Unit Nonmetric Unit

A water content w

mg/m

3

lb/MMscf

Lower Half of Display

The output quantities metric/non metric DIP switch can be used to
select between °C and °F.

It is possible to check the pressure setting of the transmitter by pressing
button Dn. To return to the temperature reading, press button Dn again.

Selecting Analog Outputs

You can select the output quantities for channels 1 and 2 by turning the
Calibration Enabled/Disabled DIP switch of the transmitter to
position Enabled (up) and the three output selection DIP switches to
position special (all up).

Press button C on the display cover: text "SCAL" appears on the
display. Then press button E until the following display appears:

0505-288

The characters on the second line of the display in this menu correspond
to the quantities according to the table in section Selecting Output

Quantities on page 49.

Select the quantity for Ch 1 with buttons Up and Dn and acknowledge
the selection with button E.

If the transmitter is equipped with two analog channels, select the
quantity for Ch 2 in the same way, for example:

50 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

0505-289

Press button C to exit the display command mode or continue by setting
the pressure.

NOTE

Remember to restore the DIP switch settings.

Scaling Analog Outputs

Turn the internal Calibration Enabled/Disabled DIP switch of the
transmitter to upward position (on). Press button C on the display cover
and a text similar to the following appears:

0604-053

Numbers on the second line indicate the low end scaling of Ch 1
currently stored in the transmitter memory. The text "Set Lo" on the
lower left corner indicates that you can now change the low end scaling
with buttons Up and Dn. Acknowledge the value with button E and a
text similar to the following appears:

0604-054

Numbers on the second line indicate the high end scaling of Ch 1. The
text "Set Hi" on the lower left-hand corner indicates that you can now
change the high end scaling with buttons Up and Dn. Acknowledge
with button E.

VAISALA_______________________________________________________________________ 51

User's Guide ______________________________________________________________________

If there is another channel available, the display shifts to the scaling
menu of Ch 2. You can now scale the analog outputs for the Ch 2 in the
same way as described above.

Press button C to exit the display command mode or continue by
selecting the output quantities. This menu starts automatically after the
scaling menu only if the output selection DIP switches are on the
position special (all up) from the beginning.

NOTE

Remember to restore the DIP switch settings.

Serial Interface

WARNING

NOTE

The serial interface MUST NOT be used in hazardous areas.

Use the serial interface for calibration and testing purposes in safe areas
only. Always use the serial interface cable (optional accessory, Vaisala
order code: 25905ZZ). Connect one end of the cable to the serial port of
your computer and the other to the connector marked "RS232C" on the
electronics unit of the transmitter (see Figure 5 on page 23).

With serial communication the current consumption increases
approximately to 7 mA and the transmitter is not able to operate with
4 mA. Therefore, it is recommended to use serial communication only
temporarily for changing settings or for calibrating the transmitter in a
safe area. With serial port, the minimum supply voltage is 15 VDC.

NOTE

52 __________________________________________________________________ M210744EN-C

The transmitter incorporates a serial interface detector. However, not
all terminals or PC serial ports (for example, optoisolated or ports not
meeting RS232C standards) recognize this standard. If the
communication is not possible via a serial interface, use a forced
activation by pressing simultaneously buttons Up and E on the
transmitter cover. To deactivate the forced activation, press these
buttons again or reset the transmitter. If the transmitter does not
receive any commands for half an hour, it automatically closes the
serial communication.

Chapter 4 ________________________________________________________________ Operation

Serial Communication Settings

Table 6 Serial Communications Settings

Parameter Value

bauds 2400
parity none
data bits 8
stop bits 1

CAUTION

When using the serial interface, be sure that power supply and serial
interface are not connected to the same ground (use a floating power
supply or hand-held serial interface device).

To start issuing commands, make sure that HMT360 is connected to a
serial port of your computer and that the terminal session is open. Issue
commands by typing them on your computer according to the following
instructions. In these commands, <cr> stands for pressing Enter (on
your computer keyboard).

Setting the Analog Outputs

ASEL Selecting Analog Outputs

Syntax: ASEL [xxx yyy]<cr>

where
xxx = Quantity of Ch 1
yyy = Quantity of Ch 2

VAISALA_______________________________________________________________________ 53

User's Guide ______________________________________________________________________

Turn the internal DIP switch Calibration Enabled/Disabled to
position ON before the selecting the analog outputs and return it to
position OFF after making the selection. Output quantities and their
abbreviations are listed in the table below:

Quantity Abbreviation

temperature T
dewpoint temperature Td
volume concentration ppmv
water content w (when scaling water content, the

abbreviation is "ng1", see note
below)

NOTE

When scaling water content w (mg/m3 or lb/mmscf) with the natural
gas transmitter, issue command SNG1.

Example:

>asel td t<cr>
Ch1 Td lo: -40.00 ’C
Ch1 Td hi: 100.00 ’C
Ch2 T lo: -40.00 ’C
Ch2 T hi: 100.00 ’C
>

S Scaling Analog Outputs

Syntax: Szz aa.a bb.b<cr>

where
zz = Quantity (T, Td, ppm, w)
aa.a = Lower limit of the quantity
bb.b= Upper limit of the quantity

Turn the internal DIP switch Calibration Enabled/Disabled to
position ON before the scaling the analog outputs and return it to
position OFF after scaling.

54 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

Example:

>std -50 50<cr>
Td lo: -50.00 %RH
Td hi: 50.00 %RH
>

Adjustment Commands

Turn the internal DIP switch Calibration Enabled/Disabled to
position ON before the adjustment and return it to position OFF after
the adjustment.

CT Temperature Adjustment

Syntax: CT<cr>
The transmitter asks and measures temperature readings and calculates

the calibration coefficients.

Example:

>ct<cr>
T : 0.811 1. ref ? 0.5<cr>
Press any key when ready ...<cr>
T : 99.122 2. ref ? 99.5<cr>
OK
>

The OK indicates that the adjustment was succesful. When performing
one-point adjustment press only Enter for the second reference.

VAISALA_______________________________________________________________________ 55

User's Guide ______________________________________________________________________

Output Commands

ITEST Testing Analog Outputs

NOTE

Before giving command ITEST, reset the transmitter with command
RESET, see section RESET Transmitter Reset on page 59.

Syntax: ITEST aa.aaa bb.bbb<cr>

where
aa.aaa = Current value to be set for Ch 1 (mA)
bb.bbb = Current value to be set for Ch 2 (mA)

This command outputs the current value of each channel and the
corresponding control signal of the digital-to-analog converter.

Example:

>itest 8 12<cr>

8.00000 403 12.00000 7DF
>itest<cr>

7.00150 30A 11.35429 73E
>

NOTE

The set current values remain valid until you issue the command ITEST
without readings or reset the transmitter. With this command the desired
outputs of the transmitter are shown.

When outputting low currents from Ch 1, remember to remove
RS232C-cable while reading the current output, because of the
increased current consumption for using RS port.

56 __________________________________________________________________ M210744EN-C

Chapter 4 ________________________________________________________________ Operation

SEND Outputting Measurement Values

Syntax: SEND<cr>
This command outputs the measured values in one point.

R Activating Continuous Output

Syntax: R<cr>
With the command R the transmitter outputs measured values

continuously.

S Stopping Continuous Output

Syntax: S<cr>
The continuous outputting is stopped with the command S. If outputting

is active, this command is not echoed.

INTV Setting Output Interval

Syntax: INTV n xxx<cr>

where
n = 1 ... 255
xxx = S, MIN or H

Sets the output interval when the transmitter outputs measurement
readings. The time interval is used when the continuous output is active.

Example, the output interval is set to 10 minutes:

>intv 10 min<cr>
Output interval: 10 MIN
>

VAISALA_______________________________________________________________________ 57

User's Guide ______________________________________________________________________

PRES Setting Ambient Pressure for Calculations

Syntax: PRES aaaa.a<cr>

where
aaaa.a = Pressure (bar

)

a

Turn the internal DIP switch Calibration Enabled/Disabled to
position ON before setting the pressure and return it to position OFF
after making the setting.

Example:

>pres 12<cr>
Pressure : 12.0 bara
>

Table 7 Pressure Conversion Chart

FROM hPa/mbar mmHg/Torr inHg atm bar psi

hPa/
mbar

TO mmHg/

Torr
inHg 0.02952999 0.03937008 1 29.921 29.52999 2.036021
atm 0.00098692 0.00131597 0.033422 1 0.98692 0.068046
bar 0.001 0.001333224 0.03386388 1.01325 1 0.06894757
psi 0.01450377 0.01933678 0.4911541 14.6962 14.50377 1

1 1.333224 33.86388 1013.25 1000 68.94757

0.7500617 1 25.40000 760 750.0617 51.71493

Example:

29.9213 inHg = 29.9213 × 33.86388 = 1013.25 hPa / mbar

NOTE

58 __________________________________________________________________ M210744EN-C

Conversions from mmHg and inHg are defined at 0 °C.

Chapter 4 ________________________________________________________________ Operation

FILT Output Filtering

Syntax: FILT a.aaa<cr>

where
a.aaa = 0.1 ... 1

1=No filtering

0.5 = Average of last two measurements

0.1 = Average of ca. 16 measurements

This commands sets the measurement result filtering.

Example:

>filt 1<cr>
Filter : 1.0000
>filt 0.5<cr>
Filter : 0.5000
>filt 0.1<cr>
Filter : 0.1000
>

Resetting the Transmitter

RESET Transmitter Reset

Syntax: RESET<cr>
This command resets the device.

VAISALA_______________________________________________________________________ 59

User's Guide ______________________________________________________________________

60 __________________________________________________________________ M210744EN-C

Chapter 5 __________________________________________________ Measuring at Overpressure

CHAPTER 5

MEASURING AT OVERPRESSURE

This chapter provides you with important information concerning
measurement in conditions with pressure higher than the normal
atmospheric pressure.

The probes HMP362, HMP364 and HMP368 are designed for dewpoint
measurement at overpressure. The maximum measurement pressures
depend on the probe as follows:

HMP362: 0 ... 167 bar (16,7 MPa), for natural gas, sample cell

HMP302SC available

HMP364: 0 ... 100 bar (10 MPa), for pressurized rooms and

processes, probe is provided with a nut, fitting screw
and sealing washer

HMP368: 0 ... 40 bar (4 MPa), for pressurized pipelines, ball

valve set available

The accuracy of the dewpoint measurement is affected by pressure in
the measurement chamber. The actual pressure in the sampling cell is
required to be set to the transmitter, see section Setting the Pressure for

Calculations on page 48).

VAISALA_______________________________________________________________________ 61

User's Guide ______________________________________________________________________

Pressure Regulator Recommended

When sampling pressurized processes exceeding the maximum
measurement pressure of the probe, the pressure in the measurement
chamber must be regulated to the acceptable level or below. It is
recommended to use pressure regulator before the measurement
chamber to prevent remarkable pressure variations.

62 __________________________________________________________________ M210744EN-C

Chapter 6 __________________________________________________ Calibration and Adjustment

CHAPTER 6

CALIBRATION AND ADJUSTMENT

This chapter contains instructions for checking the calibration and
adjusting this product.

In this User's Guide the term "calibration" refers to comparing the
device's reading against a reference concentration. "Adjustment" refers
to changing the device's reading to correspond to the reference
concentration.

Calibration Interval

HMT360 is calibrated as shipped from the factory. Typical calibration
interval is one year. In demanding applications it may be advisable to
make the first calibration check earlier.

Factory Calibration and Adjustment

NOTE

HMT360 for natural gas must always be adjusted in a Vaisala Service
Center.

The device (or the probe only) can be sent to Vaisala Service Centers
for calibration and adjustment. See section Technical Support on page

74 for contact information.

VAISALA_______________________________________________________________________ 63

User's Guide ______________________________________________________________________

Removing the Electronics Unit

0605-051

Figure 23 Detaching the Electronics Unit with Probe for

Calibration and Adjustment

1. Unfasten the screws and open the cover.

2. Switch the transmitter off with the ON/OFF switch.

3. Disconnect the flat cable by lifting it carefully, for example with a
screwdriver.

4. Remove the two screws holding the hinge support. Remove the
hinge support.

5. Turn the electronics unit slightly upwards to release it from the
hinges. Leave the transmitter base with the cable connections on
place. When putting the electronics unit back to place, attach the
upper hinge first. Remember to attach the hinge support.

64 __________________________________________________________________ M210744EN-C

Chapter 6 __________________________________________________ Calibration and Adjustment

A1

B1

B2

A2

C1

C2

On

Off

Connections

0505-293

Figure 24 Connecting Power Supply and Multimeter for

Calibration

1. Connect a power supply (12 ... 24 VDC, with a serial port the
minimum supply voltage is 15 VDC ) to the terminals B1 (-) and
C1 (+) (Ch 1) with banana plugs, see Figure 24 on page 65.

2. Connect the multimeter in series with the supply, B1 (-) and
A1 (+).

3. Follow the same procedure with Ch 2 using the terminals B2 (-)
and C2 (+). When calibrating both channels at the same time, use
two galvanically separated power supplies.

You can now calibrate or check the dewpoint and temperature or the
analog outputs according to the instructions given in this chapter.

If the current measurement is needed in a hazardous area, the
multimeter is connected to the terminals A1/A2 (+) and B1/B2 (-). Use
only an approved multimeter.

VAISALA_______________________________________________________________________ 65

User's Guide ______________________________________________________________________

I 4 mA 16 mA

Q

ref

Q

min

–

Q

max

Q

min

–

-----------------------------

⋅+=

I 4 mA 16 mA

22.3° C40° C–
120° C40° C–

--------------------------------------

⋅+ 10.230 mA==

WARNING

The power supply connectors (C1 and C2) MUST NOT be used in
hazardous areas. For calibration and adjustment in a hazardous area
use only an approved multimeter, which fulfills the safety factors
printed on the protective cover.

Calculating Correspondence of Current Values and Output Quantities

When using HMT360 without a display, calibration and adjustment is
carried out by using a multimeter. Use the following equations to
calculate the current values corresponding to the reference output
quantities.

0605-015

where
Q

Q
Q

= Reference value of the calibrated quantity

ref

= Reference value of the calibrated quantity

min

= Value corresponding to 20 mA

max

Example:

Temperature scaling -40 ... +120 °C, reference 22.3 °C:

0605-017

66 __________________________________________________________________ M210744EN-C

Chapter 6 __________________________________________________ Calibration and Adjustment

One-Point Temperature Adjustment

NOTE

NOTE

Always use a high quality standard for adjusting the temperature.

If you use serial commands, please refer to section Adjustment

Commands on page 55.

1. Set the internal DIP switch Calibration Enabled/Disabled to
position ON and select T calibration by using switches 3 and 4 (see
section DIP Switch Functions on page 47).

2. The temperature value measured by the transmitter appears on the
display as well as the text "Set Lo" on the lower left corner. If the
transmitter has no display, the LED indicator starts to blink.

3. Let the sensor stabilize; use a multimeter or the transmitter display
to monitor the stabilization.

4. Press buttons Up and Dn to adjust the display or multimeter
reading to correspond to the reference value (when using a
multimeter calculate the current value corresponding to the
reference humidity by using the equations presented in Calculating

Correspondence of Current Values and Output Quantities on page

66).

5. Conclude the one-point adjustment by pressing button E twice.

VAISALA_______________________________________________________________________ 67

User's Guide ______________________________________________________________________

ACAL Analog Output Calibration

Syntax: ACAL<cr>
Connect HMT360 to a multimeter. Issue the ACAL command:

1. Disconnect the serial cable from the transmitter while reading the
multimeter value for the Ch 1 (I1).

2. Reconnect the serial cable. Type the multimeter reading and press
Enter.

3. Type the higher current multimeter reading and press Enter.

Example:

>acal<cr>
Ch1 I1 ( mA ) ? 4.846<cr>
Ch1 I2 ( mA ) ? 19.987<cr>
>

68 __________________________________________________________________ M210744EN-C

Chapter 7 ______________________________________________________________ Maintenance

CHAPTER 7

MAINTENANCE

This chapter provides information that is needed in basic maintenance
of the product.

Periodical Checking and Cleaning

Transmitter Housing and Probe

WARNING

Avoid static discharge. Always use a wet cloth for wiping the display.

The electronics unit of the transmitter, as well as the probe, can be
removed and replaced in the field. See section Removing the

Electronics Unit on page 64 for detailed information.

All other maintenance must be performed by qualified Vaisala
personnel. If a transmitter is damaged, contact your nearest Vaisala
Service Center. See section Technical Support on page 74 for contact
information.

VAISALA_______________________________________________________________________ 69

User's Guide ______________________________________________________________________

Sintered Steel Filter

Check the sintered filter of the probe regularly. A dirty or corroded filter
needs to be replaced, as it may increase the response time and decrease
the lifetime of the sensor. Make also sure the filter remains tighly fit.

If you need to replace the filter:

1. Make sure you have the spare part available, or order one from
your nearest Vaisala Service Center. See section Technical Support

on page 74 for contact information.

2. Carefully remove the old filter from the probe.

3. Install the new filter to the probe. Make sure to tighten it.

CAUTION

Avoid touching the sensor element, as this may lead to physical
damage to the component, or measurement inaccuracy due to sensor
contamination.

70 __________________________________________________________________ M210744EN-C

Chapter 7 ______________________________________________________________ Maintenance

Sensor Element

Check the Vaisala HUMICAP® sensor in your transmitter regularly. A
corroded or otherwise damaged sensor has to be replaced, which needs
to be done by your nearest Vaisala Service Center. See section

Technical Support on page 74 for contact information.

0605-052

Figure 25 Sensor Element is Located under the Filter

The sensor element is located under the sintered steel filter. A dirty
sensor element can be cleaned by soaking the sensor in de-ionized water
or IPA (isopropanol, propan-2-ol), as follows:

CAUTION

1. Carefully remove the sintered steel filter from the probe.

2. Rinse the sensor with de-ionized water or IPA for no more than one
minute.

3. Gently dehydrate the sensor with dry gas (nitrogen) if available.

4. When the sensor and probe are both dry, install the filter back to
the probe.

Do not touch the sensor surface.
Only de-ionized water or IPA is allowed, other agents such as ethanol

cannot be used.
Do not immerse the sensor in water or IPA for more than one minute.
Water or IPA temperature must be below 30 °C (86 °F)
Do not use a cotton stick or any other mechanical means for cleaning

and/or drying the sensor.

VAISALA_______________________________________________________________________ 71

User's Guide ______________________________________________________________________

72 __________________________________________________________________ M210744EN-C

Chapter 8 ___________________________________________________________ Troubleshooting

CHAPTER 8

TROUBLESHOOTING

This chapter describes common problems, their probable causes and
remedies, and contact information.

Diagnostics

Operation Errors

The following symptoms indicate an operation error of the HMT360:

- The analog output(s) current drops below 4 mA.

- Display shows the word "ERROR".

In the case of error:

- Check that the sensor is connected properly. Clean the sensor
according to instructions in section Periodical Checking and

Cleaning on page 69.

- Check if there is condensed water in the probe. If yes, let the probe
dry.

In case of constant error, contact the Vaisala Helpdesk. See section

Technical Support on page 74 for contact information.

VAISALA_______________________________________________________________________ 73

User's Guide ______________________________________________________________________

Analog Output Test

Analog outputs can be tested with dip switch 1, see DIP Switch

Functions on page 47 for details.

Technical Support

For technical questions, contact the Vaisala technical support by e-mail
at [e-mail].

For contact information of Vaisala Service Centers, see

www.vaisala.com/services/servicecenters.html.

74 __________________________________________________________________ M210744EN-C

Chapter 9 ____________________________________________________________ Technical Data

CHAPTER 9

TECHNICAL DATA

This chapter provides technical data of the product.

Performance

Temperature (+ Operating Pressure Ranges)

Table 8 Temperature Specifications

Property Description / Value

Measurement range -40 ... +100 °C
Typical accuracy of electronics at +20 °C ± 0.1 °C
Typical temperature dep endence of

electronics
Sensor Pt 1000 RTD Class B IEC 751

0.005 °C/°C

VAISALA_______________________________________________________________________ 75

User's Guide ______________________________________________________________________

Moisture in Natural Gas

Dewpoint Measurement

Table 9 Dewpoint Measurement Specifications

Property Description / Value

Measurement range -50 ... +50 °C

(-58 ... +122 °F) Td

Accuracy ± 2 °C (± 3.6 °F) (see graph in

Figure 26 on page 76)

Response time 63 % [90 %]

-20 +10 ° C (-4 +50 ° F)
+10 -20 ° C (+50 -4 ° F)

Sensor Vaisala HUMICAP®180M

6 s [32 s]
120 s [370 s]

0505-295

Figure 26 Effect of Process Temperature on Dewpoint

Measurement Accuracy

76 __________________________________________________________________ M210744EN-C

Chapter 9 ____________________________________________________________ Technical Data

Calculated Variables Available (Typical Ranges)

Table 10 Calculated Variables Specifications

Property Description / Value

Water content 0 ... 20 lb/MMscf,

0 ... 320 mg/m

Parts per million by volume 0 ... 500 ppm

3

v

Outputs

Table 11 Output Specifications

Property Description / Value

Two analog outputs (one standard, one
optional)

Typical accuracy of analog outputs at
+20 °C

Typical temperature dep endence of analog
outputs

RS232C serial output

in safe area

for service use only

two wire 4 ... 20 mA

± 0.05 %/°C full scale

± 0.005 %/°C full scale

connector type RJ45

WARNING

Output connections are made via safety barriers.

VAISALA_______________________________________________________________________ 77

User's Guide ______________________________________________________________________

Classification with Current Outputs

Europe (VTT)

EU (94/9/EC, ATEX100a) II 1 G Ex ia IIC T4 Ga

VTT 09 ATEX 028 X issue No: 1

Safety factors Ui= 28 V, Ii= 100 mA, Pi= 700 mW

Ci= 1 nF, Linegligibly low

Environmental specifications T

= -40 ... +60 °C (-40 ... +140 °F)

amb

P

= 0.8 ... 1.1 bar

amb

Dust classification (with protection cover) II 1 D (IP65 T = 70 °C)

VTT 04 ATEX 023X

USA (FM) Classes I, II, III

Division 1, Groups A - G
Division 2, Groups A - D, F and G
FM Project ID: 3010615

Safety factors V

= 28 VDC, I

max

= 100 mA

max

Ci= 1 nF, Li= 0, Pi= 0.7 W
T

= 60 °C (140 °F), T5

amb

Japan (TIIS) Ex ia IIC T4

Code number: TC17897

Safety factors Ui= 28 VDC, Ii= 100 mA, Ci=1nF

Pi= 0.7 W , Li= 0, T

= 60 °C (140 °F)

amb

Canada (CSA)

Class I Division 1 and Division 2

Groups A, B, C, D

Class II Division 1 and Division 2

Groups G and Coal Dust

Class III CSA File No: 213862 0 000

CSA report: 1300863

Safety factors T

= 60 °C, T4,

amb

Intrinsically safe when connected as per
Installation Drawing DRW213478

China (PCEC) Ex ia II CT4

Certificate No. CE092145
Standard GB3836.1-2000 and
GB3836.4-2000

78 __________________________________________________________________ M210744EN-C

Chapter 9 ____________________________________________________________ Technical Data

IECEx (VTT) Ex ia IIC T4 Ga

IECEx VTT 09.0002x issue No:1

Safety factors Ui= 28 V, Ii= 100 mA, Pi=700 mW

Ci= 1 nF, Linegligibly low

Environmental specifications T

General

Table 12 General Specifications

Property Description / Value

Operating voltage
with serial port (service mode)

Connections screw terminals,

Cable bushings M20×1.5 (7.5 ... 12 mm)

Conduit fitting M20×1.5 / NPT 1/2"
Operating temperature range for electron ics

with display
Storage temperature range

Housing material G-AlSi 10 Mg (DIN 1725)
Housing classification IP 66 (NEMA 4X)
Housing dimensions 164 × 115 × 62 mm
Housing weight 950 g
Fully electromagnetically compatible

according to standards

= -40 ... +60 °C (-40 ... +140 °F)

amb

P

= 0.8 ... 1.1 bar

amb

12 ... 28 V
15 ... 28 V

0.33 ... 2.0 mm
(AWG 14-22)

M20×1.5 (10.5 ... 15 mm)

-20 ... +60 °C

-40 ... +70 °C

EN 61326-1: Electrical
equipment for measurement,
control and laboratory use ­EMC requirements; Industrial
environment

2

wires

NOTE

IEC 1000-4-5 complies only when using external EXi approved surge
arrester on safe area.

VAISALA_______________________________________________________________________ 79

User's Guide ______________________________________________________________________

Probes

Table 13 Probe Specifications

Property Description / Value

Probe material Stain l ess steel (AISI 316L)
Probe cable length 2 m, 5 m or 10 m
Probe cable diameter 5.5 mm
Sensor protection options sintered stainless steel filter

HMP362 Probe - small pressure-tight

Temperature range -40 ... +110 °C
Pressure range 0 ... 16.7 MPa (0 ... 167 bar)

HMP364 Probe - high pressures

Temperature range -40 ... +180 °C
Pressure range 0 ... 10 MPa (0 ... 100 bar)

HMP368 Probe - pressurized pipelines

Temperature range -40 ... +180 °C
Pressure range 0 ... 4 MPa (0 ... 40 bar)

Options and Accessories

Table 14 Options and Accessories

Item Description / Order Code

MODULES
Analog Output Module HM360AOUTSP

FILTERS
Sintered Stainless S teel Filter HM47280SP

TRANSMITTER MOUNTING ACCESSORIES
Wall Mounting Kit HM37108SP
Rain shield 215109
Protection cover (for use in the

presence of combustible dust, ATEX)

PROBE MOUNTING ACCESSORIES
HMT362/HMP362
Sampling Cell for Probe with Flange HMP302SC
5 pcs. O-ring Set Size 14.1×1.6 216026

214101

HMT364/HMP364
Fitting Body M22×1.5 17223SP
Fitting Body NPT1/2 17225SP

80 __________________________________________________________________ M210744EN-C

Chapter 9 ____________________________________________________________ Technical Data

Table 14 Options and Accessories

Item Description / Order Code

HMT368/HMP368
Fitting Body ISO1/2 Solid Structure DRW212076SP
Fitting Body NPT1/2 Solid Structure NPTFITBODASP
Fitting Body Set ISO 1/2 ISOFITBODASP
Fitting Body Set (ISO 1/2 + NPT 1/2) THREADSETASP
Leaking Screw with Allen Key 216027
Thread Adapter ISO1/2 to NPT1/2 210662SP
Sampling Cell with Female

Connectors
Sampling Cell with Swagelok

Connectors
Ball Valve ISO1/2 with Welding Joint BALLVALVE-1
Installation Flange ISO1/2 DM240FA
Manual Press HM36854SP

DMT242SC

DMT242SC2

CONNECTION CABLES
Serial Interface Cable 25905ZZ

CABLE BUSHINGS
Cable Gland M20×1.5 for 7.5...12mm

Cable
Cable Gland M20×1.5 for 10...15mm

Cable
Conduit Fitting M20×1.5 for NPT1/2

Conduit
Dummy Plug M20×1.5 for transmitter

body

OTHER
Calibration Adapter for HMK15 211302SP
Galvanic isolator 212483
Barrier 210664

216587SP

216588SP

214780SP

214672SP

VAISALA_______________________________________________________________________ 81

User's Guide ______________________________________________________________________

82 __________________________________________________________________ M210744EN-C

Appendix A ______________________________________________________________ Dimensions

APPENDIX A

DIMENSIONS

This Appendix contains parts drawings of the transmitter housing,
probes and some transmitter mounting accessories with metric and
nonmetric dimensions specified.

Transmitter Housing

0604-052

VAISALA_______________________________________________________________________ 83

User's Guide ______________________________________________________________________

HMP362

HMP364

0603-014

0603-016

84 __________________________________________________________________ M210744EN-C

Appendix A ______________________________________________________________ Dimensions

HMP368

0605-014

Mounting Plate

VAISALA_______________________________________________________________________ 85

User's Guide ______________________________________________________________________

Rain Shield

0603-041

Protection Cover

0505-304

86 __________________________________________________________________ M210744EN-C

Appendix B __________________________ ____________ Wiring for Intrinsically Safe Operation, FM

APPENDIX B

WIRING FOR INTRINSICALLY SAFE
OPERATION, FM

This appendix contains the wiring diagram for intrinsically safe
operation approved by Factory Mutual (FM).

VAISALA_______________________________________________________________________ 87

User's Guide ______________________________________________________________________

-Ch2+

HMT360 connection board

-Ch1+

Material Weigh t

DIMENSIONS ARE IN
MILLIMETERS, UNLESS
OTHERWISE SPECIFIED

FIRST ANGLE PROJECTION

Finish

DOCUMEN T CRE ATION D ATA

YYYY-MM-DD INITIAL S

Creator

Approved

Review

Archive ID

code

Supplier

Scale

Size

Title

General tolerance

Design

Code

Sheet of

Rev

REV

QTY

DESCRIPTION / INFO / ECO No.

DESIGN

ACCEPTED / ApprovedCHECKED / Reviewed

88 __________________________________________________________________ M210744EN-C

0505-305

Appendix C_____________________________________ Wiring for Intrinsically Safe Operation, CSA

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).

VAISALA_______________________________________________________________________ 89

User's Guide ______________________________________________________________________

0505-306

90 __________________________________________________________________ M210744EN-C

Appendix D______________________________________________________________ Certificates

APPENDIX D

CERTIFICATES

This Appendix contains copies of the EXi intrinsically safe certificates
issued for the HMT360 series.

- VTT IECEx Certificate

- VTT ATEX Certificates

- FM Certificate of Compliance

- CSA Certificate of Compliance

- TIIS Certificate of Compliance

- PCEC Conformity Certificate

VAISALA_______________________________________________________________________ 91

User's Guide ______________________________________________________________________

1002-094

Figure 27 VTT IECEx Certificate Page 1/4

92 __________________________________________________________________ M210744EN-C

Appendix D______________________________________________________________ Certificates

1002-095

Figure 28 VTT IECEx Certificate Page 2/4

VAISALA_______________________________________________________________________ 93

User's Guide ______________________________________________________________________

1002-096

Figure 29 VTT IECEx Certificate Page 3/4

94 __________________________________________________________________ M210744EN-C

Appendix D______________________________________________________________ Certificates

1002-097

Figure 30 VTT IECEx Certificate Page 4/4

VAISALA_______________________________________________________________________ 95

User's Guide ______________________________________________________________________

1002-091

Figure 31 VTT ATEX 028X Certificate Page 1/2

96 __________________________________________________________________ M210744EN-C

Appendix D______________________________________________________________ Certificates

1002-092

Figure 32 VTT ATEX 028X Certificate Page 2/2

VAISALA_______________________________________________________________________ 97

User's Guide ______________________________________________________________________

1002-093

Figure 33 VTT ATEX 028X Certificate Schedule

98 __________________________________________________________________ M210744EN-C