Vaisala HUMICAP HMT360 SERIES User manual

USER’S GUIDE
Vaisala HUMICAP® Humidity and
Temperature Transmitter Series HMT360
M010056EN-I

PUBLISHED BY
Visit our Internet pages at www.vaisala.com
© Vaisala 2011
No part of this manual may be reproduced in any form or by any means,
electronicormechanical(includingphotocopying),normayitscontentsbe
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.
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland

________________________________________________________________________________
VAISALA________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Contents of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Version Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Regulatory Compliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EU Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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
General Instructions for Probes with Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Checking the Temperature Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mounting the Transmitter Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Probe Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
HMP363 for Confined Spaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
HMP363/365/367 Duct Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
HMP364 for High-Pressure Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
HMP365 for High Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
HMP367 for High Humidities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
HMP368 for Pressurized Pipelines or Moisture in Liquids . . . . . . . . . . . . . . . . . . . . . 30
Tightening the Clasp Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Installing the HMP368 Probe Through a Ball Valve Assembly. . . . . . . . . . . . . . . 32
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Installation in Hazardous Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

________________________________________________________________________________
2 _______________________________________________________________________________
US and Canadian Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
European Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
CATEGORY 1 (Zone 0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
HMT360 Connected to a Zener Barrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Examples of Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
CHAPTER 4
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Local Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Power ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
HMT360 with Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
HMT360 without Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
DIP Switch Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Display/Keypad Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Setting the Pressure for Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Selecting Output Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Upper Half of Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Lower Half of Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Selecting Analog Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Scaling Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Serial Communication Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Setting the Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
ASEL Selecting Analog Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
S Scaling Analog Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Adjustment Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
CRH Relative Humidity Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
CT Temperature Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Output Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
ITEST Testing Analog Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SEND Outputting Measurement Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
R Activating Continuous Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
S Stopping Continuous Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
INTV Setting Output Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
PRES Setting Ambient Pressure for Calculations . . . . . . . . . . . . . . . . . . . . . . . . 55
FILT Output Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
RESET Transmitter Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
CHAPTER 5
MEASURING AT OVERPRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Pressure Regulator Recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
CHAPTER 6
CALIBRATION AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Factory Calibration and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

________________________________________________________________________________
VAISALA________________________________________________________________________ 3
User Calibration and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Removing the Electronics Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Calculating Correspondence of Current Values and Output Quantities . . . . . . . . . 62
Relative Humidity Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Automatic Two-Point Adjustment (Only HMT360 with Display) . . . . . . . . . . . . . . . . . 63
Manual Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Low End Adjustment (HMT360 without Display) . . . . . . . . . . . . . . . . . . . . . . . . . 65
High End Adjustment (HMT360 without Display) . . . . . . . . . . . . . . . . . . . . . . . . . 66
Low End Adjustment (HMT360 with Display). . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
High End Adjustment (HMT360 with Display) . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
One-Point Temperature Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
ACAL Analog Output Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
CHAPTER 7
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Periodical Checking and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Transmitter Housing and Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
CHAPTER 8
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Analog Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Product Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
CHAPTER 9
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Temperature (+ Operating Pressure Ranges) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Water Activity in Jet Fuel Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Calculated Variables (Typical Ranges) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
With HMP361 Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
With HMP363, HMP364, HMP365, HMP367 and HMP368 Probes. . . . . . . . . . . 75
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Classification with Current Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Accuracy of Calculated Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Accuracy of Dewpoint Temperature °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Accuracy of Mixing Ratio g/kg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Accuracy of Wet Bulb Temperature °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Accuracy of Absolute Humidity g/m3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

________________________________________________________________________________
4 _______________________________________________________________________________
APPENDIX A
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
HMP361 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
HMP363 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
HMP364 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
HMP365 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
HMP367 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
HMP368 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Rain Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Protection Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
APPENDIX B
WIRING FOR INTRINSICALLY SAFE OPERATION, FM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
APPENDIX C
WIRING FOR INTRINSICALLY SAFE OPERATION, CSA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
APPENDIX D
CERTIFICATES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

________________________________________________________________________________
VAISALA________________________________________________________________________ 5
List of Figures
Figure 1 HMT360 and Probe Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 2 Probe Options for HMT360 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 3 Horizontal Mounting of Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 4 Vertical Mounting of Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 5 Measurement Error at 100 %RH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 6 Transmitter Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 7 Parts of the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 8 Installation of HMP363 Probe in Duct with Flange and Supporting Bar . . . 25
Figure 9 HMP364 Probe Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 10 Marking Nut and Fitting Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 11 Cleaning the Tightening Cone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 12 Mounting HMP365 Probe in Duct or Channel . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 13 HMP368 Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 14 Sealing of Fitting Body into Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 15 Tightening the Clasp Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 16 Installing the HMP368 Probe Through a Ball Valve Assembly . . . . . . . . . . 33
Figure 17 HMT360 Connected to Galvanic Isolator . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 18 HMT360 Connected to a Zener Barrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 19 STAHL 9160/13-11-11 (Galvanic Isolator) . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 20 STAHL 9001/51-280-091-141 (Zener Barrier) . . . . . . . . . . . . . . . . . . . . . . 41
Figure 21 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 22 Local Display/Keypad Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 23 DIP Switch Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 24 Detaching the Electronics Unit with Probe for Calibration
and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Figure 25 Connecting Power Supply and Multimeter for Calibration . . . . . . . . . . . . . 61
Figure 26 Display Chart of the Automatic Adjustment Procedure . . . . . . . . . . . . . . . . 64
Figure 27 Accuracy over Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Figure 28 VTT IECEx Certificate page 1/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure 29 VTT IECEx Certificate page 2/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Figure 30 VTT IECEx Certificate page 3/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure 31 VTT IECEx Certificate page 4/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Figure 32 VTT ATEX 028X Certificate page 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Figure 33 VTT ATEX 028X Certificate page 2/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 34 VTT ATEX 028X Certificate Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Figure 35 VTT ATEX 023X Certificate page 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure 36 VTT ATEX 023X Certificate page 2/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Figure 37 FM Certificate of Compliance page 1/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure 38 FM Certificate of Compliance page 2/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Figure 39 FM Certificate of Compliance page 3/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure 40 CSA Certificate of Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure 41 TIIS Certificate of Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Figure 42 PCEC Conformity Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Figure 43 GOST Certificate of Conformity page 1/3 . . . . . . . . . . . . . . . . . . . . . . . . . 109
Figure 44 GOST Certificate of Conformity page 2/3 . . . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 45 GOST Certificate of Conformity page 3/3 . . . . . . . . . . . . . . . . . . . . . . . . . 111

________________________________________________________________________________
6 _______________________________________________________________________________

________________________________________________________________________________
VAISALA________________________________________________________________________ 7
List of Tables
Table 1 Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3 Output Quantities for HMT360 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 4 HMP368 Probe Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 5 Serial Communications Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 6 Pressure Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 7 Relative Humidity Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 8 Temperature Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 9 Water Activity in Jet Fuel Applications Specifications . . . . . . . . . . . . . . . . . 75
Table 10 HMP361 Calculated Variables Specifications . . . . . . . . . . . . . . . . . . . . . . . 75
Table 11 HMP363, HMP364, HMP365, HMP367& HMP368 Probes Calculated
Variables Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 12 Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Table 13 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Table 14 Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

________________________________________________________________________________
8 _______________________________________________________________________________

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 9
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® Humidity and Temperature
Transmitter Series HMT360.
Contents of This Manual
- 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.
- 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.

User’s Guide ______________________________________________________________________
10 ___________________________________________________________________ M010056EN-I
- 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.
Version Information
Related Manuals
Table 1 Manual Revisions
Manual Code Description
M010056EN-I This manual. July 2011 - Updated
Appendix Appendix D, Certificates,
on page 93.
M010056EN-H Previous version. Updated
Appendix Appendix D, Certificates,
on page 93. Updated manual
calibration instructions.
Table 2 Related Manuals
Manual Code Manual Name
M210185EN Humidity Calibrator HMK15 User's
Guide

Chapter 1 ________________________________________________________ General Information
VAISALA_______________________________________________________________________ 11
Documentation Conventions
Throughout the manual, important safety considerations are highlighted as
follows:
Safety
The HMT360 series transmitter delivered to you has been tested for safety
and approved as shipped from the factory. Note the following precautions:
WARNING 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 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 Note highlights important information on using the product.
WARNING Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage the product or
lead to malfunction.

User’s Guide ______________________________________________________________________
12 ___________________________________________________________________ M010056EN-I
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.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.

Chapter 1 ________________________________________________________ General Information
VAISALA_______________________________________________________________________ 13
Regulatory Compliances
EU Declaration of Conformity
The HMT360 series transmitters are in conformity with the provisions of
the following EU directive(s):
- ATEX Directive
- EMC Directive
- ROHS Directive
Conformity is shown by compliance with the following standards:
- EN 60079-0
- EN 60079-11
- EN 60079-26
- EN 61326-1: Electrical equipment for measurement, control and
laboratory use - EMC requirements - for use in industrial locations.
- EN 55022: Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement.
EC-type examination certificate number: VTT 09 ATEX 028X issue No:1.
Certifications
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 77.
Copies of the certificates and wiring diagrams are provided in the
following appendices:
-Appendix B, Wiring for Intrinsically Safe Operation, FM, on page 89
-Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page
91
-Appendix D, Certificates, on page 93

User’s Guide ______________________________________________________________________
14 ___________________________________________________________________ M010056EN-I
Trademarks
HUMICAP® is a registered trademark of Vaisala Oyj.
License Agreement
Allrights to any software areheldbyVaisala or third parties. Thecustomer
is allowed to use the software only to the extent that is provided by the
applicable supply contract or Software License Agreement.
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.

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 15
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages, and the product
nomenclature.
Introduction to HMT360
Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT360 contains reliable, microprosessor-based two-wire instruments
for measuring relative humidity and temperature in hazardous areas.
0606-003
Figure 1 HMT360 and Probe Types
WARNING In hazardous environments, the transmitters must always be connected
via galvanic isolators or Zener barriers.

User’s Guide ______________________________________________________________________
16 ___________________________________________________________________ M010056EN-I
Output Quantities
Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT360 is available either with or without 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
Character Quantity Abbreviation Availability
0 relative humidity RH A, D
1 temperature T A, D, F, H
2 dewpoint
temperature Td D
3 absolute humidity a D
4 mixing ratio x D
5 wet bulb
temperature Tw D
6mass
concentration of
water
ppmw H
7 water activity aw H, F
8 relative humidity
of saturation RS H
9 saturation
temperature Ts H
The characters used to indicate availability in the table above:
A = Available for HMT360 standard version
D = Available for HMT360 with optional calculations
F = Available for HMT360 Moisture and Temperature in oil
transmitter
H = Available for HMT360 Moisture and Temperature in Jet Fuel
transmitter

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 17
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.
0603-036
Figure 2 Probe Options for HMT360
The following numbers refer to Figure 2 on page 17:
1 = HMP361 probe for wall mounting
2 = HMP363 probe for tight spaces
3 = HMP364 probe for pressurized spaces up to 100 bars
4 = HMP365 probe for high temperatures up to 180 °C *) Flange
for HMP365 available as an option
5 = HMP367 probe for high humidities
6 = HMP368 probe for installations in pressurized pipelines up to
40 bars; features a pressure-tight sliding clasp nut

User’s Guide ______________________________________________________________________
18 ___________________________________________________________________ M010056EN-I