Vaisala OMT364 User Manual
USER'S GUIDE
®
Vaisala SPECTRACAP
Oxygen Transmitter OMT364
M210862EN-A
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2009
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
General Safety Considerations . . . . . . . . . . . . . . . . . . . . .11
Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Product Related Safety Precautions . . . . . . . . . . . . . . . . . .12
ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Regulatory Compliances . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Patent Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
License Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
CHAPTER 2
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Introduction to OMT364 . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
OMT364 in Hazardous Locations . . . . . . . . . . . . . . . . . . . . .17
OMT364 for In-Line and Sampling Cell Mounting . . . . . . .18
OMT364 for Ambient Gas Measurement . . . . . . . . . . . . . . .20
CHAPTER 3
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Measurement Principle and Sensor Technology . . . . . . . .21
Construction of the OMT364 Probe . . . . . . . . . . . . . . . . . . .23
Eye Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
CHAPTER 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Selecting the Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Transmitter Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Chemical Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Temperature Conditions of Installation Location . . . . . . . .29
Powerful Light Sources Near the Oxygen Measurement
Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Maximum Allowed Installation Angle . . . . . . . . . . . . . . . . .30
Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Process Conditions in Regard to Mounting Options . . . . .31
Flange Mounted for In-Line Process Gas Measurement . .33
VAISALA________________________________________________________________________ 1
________________________________________________________________________________
Suitable Process Flanges . . . . . . . . . . . . . . . . . . . . . . 33
Filter Recommendation . . . . . . . . . . . . . . . . . . . . . . . . 33
Mounting with a Flange Adapter . . . . . . . . . . . . . . . . . 34
Mounting with a Sampling Cell . . . . . . . . . . . . . . . . . . . . . .35
Filter Recommendation . . . . . . . . . . . . . . . . . . . . . . . . 36
Mounting with a Wall Mounting Bracket. . . . . . . . . . . . 37
Tubing Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Installation Instructions for Swagelok Tube Fittings 38
Sampling Cell Instructions . . . . . . . . . . . . . . . . . . . . . . 39
Mounting the OMT364 for Ambient Gas Measurement . . .41
Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Signal and Power Supply Wiring . . . . . . . . . . . . . . . . . . . .43
CHAPTER 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Device Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Keypad, Display and LEDs . . . . . . . . . . . . . . . . . . . . . . . .47
Service Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Installing the Driver for the USB Cable . . . . . . . . . . . . 48
Customer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Local Interface (Keypad and Display) . . . . . . . . . . . . . . . . .50
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Error Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Service Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Customer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
General Instructions for Using Functions . . . . . . . . . . . . . .53
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Serial Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
List of Serial Commands . . . . . . . . . . . . . . . . . . . . . . . . . .59
Outputting Measurement Results . . . . . . . . . . . . . . . . . . . .60
Start Continuous Output Command (R) . . . . . . . . . . . . . . .60
Stop Continuous Output Command (S) . . . . . . . . . . . . . . .61
Show/Set Continuous Output Interval Command (INTV) . .61
Send Measurement Results Command (SEND) . . . . . . . .62
Show/Set Serial Communications Mode Command
(SMODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Show/Set Serial Communications Mode for Line 2
Command (SMODE2) . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Show/Set Serial Communications Settings Command
(SERI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
2 _______________________________________________________________________________
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Show/Set Serial Communication Settings for Line 2
Command (SERI2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Show Serial Line 1 Status Command (SCI1) . . . . . . . . . . .65
Show Serial Line 2 Status Command (SCI2) . . . . . . . . . . .65
Show Measurement Status Command (MEA) . . . . . . . . . .66
Oxygen Statistics Display Function . . . . . . . . . . . . . . . . . .66
Temperature Statistics Display Function . . . . . . . . . . . . . .67
Formatting Measurement Results . . . . . . . . . . . . . . . . . . . .67
Set Output Format Command (FORM) . . . . . . . . . . . . . . .67
Show/Set Date Command (DATE) . . . . . . . . . . . . . . . . . .69
Show/Set Time Command (TIME) . . . . . . . . . . . . . . . . . . .70
Networking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Show/Set Device Address Command (ADDR) . . . . . . . . .70
Open Communications Line Command (OPEN) . . . . . . . .71
Close Serial Line in Poll Mode Command (CLOSE) . . . . .71
Set Echoing Mode Command (ECHO) . . . . . . . . . . . . . . .72
Accessing Service Level Commands . . . . . . . . . . . . . . . . .73
Issue Password Command (PASS) . . . . . . . . . . . . . . . . . .73
Issue Password Function (Pas) . . . . . . . . . . . . . . . . . . . . .73
Analog Output Calibration . . . . . . . . . . . . . . . . . . . . . . . . . .74
Calibrate Analog Output Command (ICAL) . . . . . . . . . . . .74
Analog Output Scaling and Settings . . . . . . . . . . . . . . . . . .75
Scale Analog Output Function (Ascl) . . . . . . . . . . . . . . . . .75
Show/Set Output Parameters Command (OUT_PARAMS) 75
Analog Output Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Set Test Current to Analog Output Command (ITEST) . . .76
Test Analog Output Function (Aou) . . . . . . . . . . . . . . . . . .77
Relay Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Show/Set Relay Operating Mode Command
(RELAY_MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Show/Set Relay Trigger Points Command (RSEL) . . . . . .78
Test Alarm Relay Function (Ala) . . . . . . . . . . . . . . . . . . . .79
Device Information and Other General Commands . . . . . .79
Show Information about the Device Command (?) . . . . . .79
Show Information about the Device Overriding POLL
Mode Command (??) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Show Measuring Parameters Command (CALCS) . . . . . .81
Show Calibration Information (CINFO) . . . . . . . . . . . . . . .81
Show Display Board Status Command (DB) . . . . . . . . . . .82
List Commands Command (HELP) . . . . . . . . . . . . . . . . . .82
Show Laser Temperature Controller Status Command
(LTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Show Output Status Command (OUT) . . . . . . . . . . . . . . .83
Show All Modifiable Parameter Values (PARAM) . . . . . . .84
Measure Signal Level Command (SIL) . . . . . . . . . . . . . . .84
Signal Level Display Function (Sil) . . . . . . . . . . . . . . . . . .85
Show Statistical Information Command (STATS) . . . . . . .85
Show Status of Subfunctions Command (STATUS) . . . . .86
Show Product Name and Software Version Command
(VERS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
VAISALA________________________________________________________________________ 3
________________________________________________________________________________
Memory Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Save Parameters Command (SAVE) . . . . . . . . . . . . . . . . .87
Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Reset Command (RESET) . . . . . . . . . . . . . . . . . . . . . . . . .88
Reset Function (Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
CHAPTER 6
SETTING ENVIRONMENTAL PARAMETERS . . . . . . . . . . . . . . . . . . . . . .89
Environmental Parameter Compensations . . . . . . . . . . . . .89
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Show/Set Pressure for Compensation Command
(PRES). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Set Pressure for Compensation Command (XPRES) . 93
Set (Average) Process Pressure Function (App). . . . . 93
Background Gas Effects . . . . . . . . . . . . . . . . . . . . . . . . . .94
General Information About Background Gas Effects. . 94
Water Content of Background Gas . . . . . . . . . . . . . . . 95
Set Water Content for Compensation Command (H2O) 97
Set (Average) Water Content Function (H2O). . . . . . . 98
CO2 Concentration of Background Gas. . . . . . . . . . . . 98
Set Carbon Dioxide Content for Compensation
Command (CO2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Set (Average) Carbon Dioxide Content Function (CO2) 99
Setting Several/All Environmental Parameters with
Single Command (ENV) . . . . . . . . . . . . . . . . . . . . . . . . . .100
CHAPTER 7
CALIBRATION AND ADJUSTMENT (IN-LINE AND SAMPLING CELL
VERSIONS OF OMT364) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
Hardware Arrangements for Calibration and
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Gas Feed Setup for Calibration and Adjustment . . . . . . .102
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Using Bottled Gas and Calibration Chamber. . . . . . . 103
Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Calibration or Adjustment in Process. . . . . . . . . . . . . 103
Connections and Systems . . . . . . . . . . . . . . . . . . 104
Preparations for Adjustment . . . . . . . . . . . . . . . . . 104
Connecting the Gas . . . . . . . . . . . . . . . . . . . . . . . 104
Adjusting Gas Flow. . . . . . . . . . . . . . . . . . . . . . . . 105
Information on Calibration Gases. . . . . . . . . . . . . . . . 106
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Using Calibration Gases . . . . . . . . . . . . . . . . . . . . . . . . .108
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Lock Outputs for Calibration Command (ADJUST) . . . . .108
Calibration Check Function (Cal.C) . . . . . . . . . . . . . . . . .108
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
4 _______________________________________________________________________________
________________________________________________________________________________
Possible Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
One-Point Adjustment Using Serial Line . . . . . . . . . . . . .110
One-Point Adjustment Command (COXY1) and
Procedure Using Serial Line . . . . . . . . . . . . . . . . . . . 110
One-Point Adjustment Using Local Interface . . . . . . . . . .112
One-Point Adjustment Function (CAL1). . . . . . . . . . . 112
One-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Two-Point Adjustment Using Serial Line . . . . . . . . . . . . .114
Two-Point Adjustment Command (COXY2) and
Procedure Using Serial Line . . . . . . . . . . . . . . . . . . . 114
Two-Point Adjustment Using Local Interface . . . . . . . . . .117
Two-Point Adjustment Function (CAL2). . . . . . . . . . . 117
Two-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Restoring Factory Calibration . . . . . . . . . . . . . . . . . . . . .119
Restore Factory Calibration Command
(FCRESTORE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Restore Factory Calibration Function (Fac). . . . . . . . 119
CHAPTER 8
CALIBRATION AND ADJUSTMENT (AMBIENT GAS MEASUREMENT
VERSION OF OMT364) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Hardware Arrangements for Calibration and
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
Gas Feed Setup for Calibration and Adjustment . . . . . . .123
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Using Bottled Calibration Adjustment Gas. . . . . . . . . 123
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
Using Calibration Gas . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Information on Calibration Gases . . . . . . . . . . . . . . . . . .126
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .127
Lock Outputs for Calibration Command (ADJUST) . . . . .127
Calibration Check Function (Cal.C) . . . . . . . . . . . . . . . . .127
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128
Possible Adjustments for Ambient Measurement Version 129
One-Point Adjustment Using Serial Line . . . . . . . . . . . . .129
One-Point Adjustment Command (COXY1) and
Procedure Using Serial Line . . . . . . . . . . . . . . . . . . . 129
One-Point Adjustment Using Local Interface . . . . . . . . . .131
One-Point Adjustment Function (CAL1). . . . . . . . . . . 131
One-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Restoring Factory Calibration . . . . . . . . . . . . . . . . . . . . .133
Restore Factory Calibration Command
(FCRESTORE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Restore Factory Calibration Function (Fac). . . . . . . . 134
VAISALA________________________________________________________________________ 5
________________________________________________________________________________
CHAPTER 9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Field Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Cleaning the Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Using Solvents to Clean the Optics . . . . . . . . . . . . . . 136
Cleaning the Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Cleaning the Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Replacing Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . .138
OMT364 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
Cleaning and Changing the Stainless Steel Mesh
Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Changing the PTFE Filter. . . . . . . . . . . . . . . . . . . . . . 139
CHAPTER 10
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Error Detection During Operation . . . . . . . . . . . . . . . . . . .142
Error Control and Error Categories . . . . . . . . . . . . . . . . .143
Fatal Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Nonfatal Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Emergency Shutdown State . . . . . . . . . . . . . . . . . . . 145
Show Error Control Status (ERR) . . . . . . . . . . . . . . . . . .145
Show Error Log (ERRL) . . . . . . . . . . . . . . . . . . . . . . . . . .146
Show Detected Errors (ERRS) . . . . . . . . . . . . . . . . . . . . .146
Show Error Table (ERRT) . . . . . . . . . . . . . . . . . . . . . . . .146
Error Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
Error Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Return Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Vaisala Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . .149
CHAPTER 11
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . .154
APPENDIX A
FLANGE PREPARATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . .155
APPENDIX B
HUMIDITY CONVERSION TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
APPENDIX C
CONTROL DRAWINGS AND CERTIFICATES . . . . . . . . . . . . . . . . . . . .159
6 _______________________________________________________________________________
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List of Figures
Figure 1 Flange Mounted OMT364 . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 2 OMT364 with Sampling Cell. . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 3 OMT364 for Ambient Gas Measurement. . . . . . . . . . . . . . . . .20
Figure 4 O2 Absorption Spectrum Around the 760 nm Near Infrared
Region . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 5 Adjacent O2 Absorption Lines and Laser Emission Peak . . . .22
Figure 6 Schematic of Probe Design . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 7 OMT364 Laser Eye Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Figure 8 OMT364 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 9 Installation Angle Limitations in High Humidities . . . . . . . . . . .31
Figure 10 OMT364 Transmitter with Flange Adapter. . . . . . . . . . . . . . . .33
Figure 11 Dimensions of OMT 364 Flange Mounted. . . . . . . . . . . . . . . .35
Figure 12 OMT364 Transmitter with Sampling Cell. . . . . . . . . . . . . . . . .36
Figure 13 Sample Gas Treatment System. . . . . . . . . . . . . . . . . . . . . . . .37
Figure 14 Swagelok Tube Fitting Instructions . . . . . . . . . . . . . . . . . . . . .39
Figure 15 Detaching the Sampling Cell . . . . . . . . . . . . . . . . . . . . . . . . . .40
Figure 16 Dimensions, OMT364 with Sampling Cell . . . . . . . . . . . . . . . .40
Figure 17 OMT364 for Ambient Gas Measurement with Wall Mounting
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 18 OMT364 Wall Mounted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Figure 19 Dimensions and Drilling Holes, Wall Mounting Bracket (Right)
and Flange Adapter (Left) . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Figure 20 Connections/Local Interface Layout. . . . . . . . . . . . . . . . . . . . .44
Figure 21 OMT364 Display Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Figure 22 Effect of Process Pressure Compensation . . . . . . . . . . . . . . .91
Figure 23 Attaching OMT364 Probe into Calibration Chamber . . . . . . .103
Figure 24 Flow Rate vs. Pressure, Back Pressure Valve Swagelok
SS-CHSM2-KZ-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
Figure 25 Oxygen Readings in Relative Humidity . . . . . . . . . . . . . . . . .107
Figure 26 Attaching OMT364 Probe into Sample Cell . . . . . . . . . . . . . .124
Figure 27 Oxygen Readings in Alternating Humidity . . . . . . . . . . . . . . .125
Figure 28 Calibration Gas O2 Concentration Readings for Ambient
Gas Measurement Version of OMT364 . . . . . . . . . . . . . . . . .126
Figure 29 Location of Mirror in Oxygen Measurement Probe . . . . . . . .136
Figure 30 Location of Lens in Oxygen Measurement Probe . . . . . . . . .137
Figure 31 Stainless Steel Mesh and PTFE Filters . . . . . . . . . . . . . . . . .138
Figure 32 OMT364 Control Drawing, FM. . . . . . . . . . . . . . . . . . . . . . . .160
Figure 33 US Certificate - Page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
Figure 34 US Certificate - Page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
Figure 35 Canadian Certificate - Page 1 . . . . . . . . . . . . . . . . . . . . . . . .163
Figure 36 Canadian Certificate - Page 2 . . . . . . . . . . . . . . . . . . . . . . . .164
VAISALA________________________________________________________________________ 7
________________________________________________________________________________
8 _______________________________________________________________________________
________________________________________________________________________________
List of Tables
Table 1 Process Conditions and Mounting Options . . . . . . . . . . . . . . . . .32
Table 2 Meaning of the Command Line Elements . . . . . . . . . . . . . . . . . .58
Table 3 OMT364 Default Serial Communication Settings. . . . . . . . . . . . .58
Table 4 List of Serial Commands without Password. . . . . . . . . . . . . . . . .59
Table 5 List of Additional Serial Commands with Password Given. . . . . .59
Table 6 Format String Abbreviations and Quantities . . . . . . . . . . . . . . . .68
Table 7 Format String Modifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Table 8 Conversion Table from T and RH to Absolute Humidity and the
Effect of Humidity on Transmitter Reading . . . . . . . . . . . . . . . . .96
Table 9 Actions When Fatal Error Has Been Detected. . . . . . . . . . . . . . .144
Table 10 Actions When Nonfatal Error Has Been Detected . . . . . . . . . . . .144
Table 11 Actions When Warning Has Been Detected . . . . . . . . . . . . . . . .145
Table 12 Emergency Shutdown Actions. . . . . . . . . . . . . . . . . . . . . . . . . . .145
Table 13 Error Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Table 14 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Table 15 Background Gas Effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Table 16 Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Table 17 Inputs and Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Table 18 Approvals and Fulfilled Standards . . . . . . . . . . . . . . . . . . . . . . . .153
Table 19 Dimensions and Mechanics. . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
Table 20 Available Spare Parts and Accessories. . . . . . . . . . . . . . . . . . . .154
VAISALA________________________________________________________________________ 9
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10 ______________________________________________________________________________
Chapter 1 ________________________________________________________ General Information
CHAPTER 1
GENERAL INFORMATION
About This Manual
WARNING
CAUTION
This manual provides information for installing, operating, and
maintaining Vaisala SPECTRACAP® Oxygen Transmitter OMT364.
General Safety Considerations
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
VAISALA_______________________________________________________________________ 11
Note highlights important information on using the product.
User's Guide ______________________________________________________________________
Feedback
Vaisala Customer Documentation Team welcomes your comments and
suggestions on the quality and usefulness of this publication. If you find
errors or have other suggestions for improvement, please indicate the
chapter, section, and page number. You can send comments to us by email: manuals@vaisala.com.
Product Related Safety Precautions
The Vaisala SPECTRACAP® Oxygen Transmitter OMT364 delivered
to you has been tested for safety and approved as shipped from the
factory. The wetted components of the transmitter are oxygen
compatible, and have been cleaned at the factory to ensure that they can
be safely placed in 100% oxygen. Only oxygen compatible lubricant
(Krytox 240 AC) has been used in the assembly.
WARNING
CAUTION
CAUTION
Note the following precautions:
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.
OMT364 is a Class 1 laser product.
Normal handling and operation of the device is eye-safe, because laser
radiation is collimated and maintained inside the probe, as is
schematically shown in Figure 7 on page 24. No laser radiation is
emitted outside the probe. Avoid placing reflective surfaces (tools,
etc.) directly into the probe when the transmitter is in operation, since
this might cause reflection of laser radiation outside the probe.
12 ___________________________________________________________________M210862EN-A
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.
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 this is not possible, ground
yourself with a wrist strap and a resistive connection cord to the
equipment chassis before touching the boards. When neither of the
above is possible, at least touch a conductive part of the equipment
chassis with your other hand before touching the boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
Recycling
VAISALA_______________________________________________________________________ 13
User's Guide ______________________________________________________________________
Regulatory Compliances
OMT364 Oxygen Transmitter is classified as Class 1 laser device in
accordance with IEC 60825-1. CDRH accession number: 07R0485-
000.
OMT364 Oxygen Transmitter is approved for Class I, Division 2,
Groups A, B, C and D. Sensor for Class I, Division 1 and 2, Groups A,
B, C and D hazardous indoor and outdoor locations with an enclosure
rating IP66. Temperature class T4.
Patent Notice
The OMT364 Oxygen Transmitter is protected by the following patents
and their corresponding national rights:
Finnish patent 117808, U.S. patent 7405827.
Trademarks
Vaisala SPECTRACAP® is a registered trademark of Vaisala Oyj.
®
Kalrez
and Krytox® are registered trademarks of DuPont.
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.
14 ___________________________________________________________________M210862EN-A
Chapter 1 ________________________________________________________ General Information
Warranty
For certain products Vaisala normally gives a limited one-year
warranty. Please observe that any such warranty may not be valid in
case of damage due to normal wear and tear, exceptional operating
conditions, negligent handling or installation, or unauthorized
modifications. Please see the applicable supply contract or Conditions
of Sale for details of the warranty for each product.
VAISALA_______________________________________________________________________ 15
User's Guide ______________________________________________________________________
16 ___________________________________________________________________M210862EN-A
Chapter 2 __________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIEW
Introduction to OMT364
The following sections provide a short overview of the Vaisala
SPECTRACAP® Oxygen Transmitter OMT364 and describe the three
different versions of the product.
The OMT364 is an optical device for measuring oxygen concentration
in gases. The instrument consists of a measurement probe attached to an
electronics enclosure. Typical applications of OMT364 include inert
gas blanketing and pharmaceutical processes in demanding
environments, where hazardous gas is present. The nonincendive
transmitter can be located in Class I, Division 2 and the encapsulated
probe in Class I, Division 1.
OMT364 in Hazardous Locations
Because of the structure of the transmitter, pay special attention to
selecting the location where the transmitter will be installed and take
into consideration the Division separation, see Figure 1 on page 19,
Figure 2 on page 19 and Figure 3 on page 20. Follow the instructions
for cabling given in the control drawing, see Appendix A, Flange
Preparation Instructions, on page 155.
CAUTION
VAISALA_______________________________________________________________________ 17
Samples in excess of 25% O2 should not be measured (or appear)
in hazardous areas!
User's Guide ______________________________________________________________________
OMT364 for In-Line and Sampling Cell Mounting
In processes with moderate temperatures (up to 80 °C) and limited
pressures (0.8 ... 1.4 bara), OMT364 can be installed directly into the
process (in-line mounting) using a mounting flange, whereas in
processes with high temperatures (> 80 °C), high pressures (> 1.4 bara)
or extremely difficult mechanical conditions (viscous liquids or slurries,
adhesive materials) an extractive measurement can be made by feeding
a sample of gas into an optional sampling cell.
In in-line and sampling cell configurations the OMT364 transmitter
measures process and sampled O2 concentrations of 0 ... 25 %O2. With
these configurations, it is assumed that the transmitter housing is
mounted in an environment that has only normal pressure variations and
O2 concentration of normal ambient air, approximately 21 %O2. The
environmental conditions of the electronics housing affect the O2
measurement, because O2 absorption of normal surrounding air inside
the enclosure is used for realizing certain internal functions of the
measurement.
Figure 1 on page 19 and Figure 2 on page 19 contain the main
specifications for the measurement environment and mounting the
OMT364.
18 ___________________________________________________________________M210862EN-A
Chapter 2 __________________________________________________________ Product Overview
0706-106
Figure 1 Flange Mounted OMT364
0706-107
Figure 2 OMT364 with Sampling Cell
VAISALA_______________________________________________________________________ 19
User's Guide ______________________________________________________________________
OMT364 for Ambient Gas Measurement
0706-108
Figure 3 OMT364 for Ambient Gas Measurement
Ambient oxygen concentration measurement, for example in oxygen
deficiency monitoring, requires a special version of OMT364. Please
observe that sections of this User's Guide covering the version for
ambient gas measurement are applicable only to customers who have
ordered this specific version of the transmitter.
With the ambient environment configuration it is assumed that the
entire transmitter (both measurement probe and transmitter housing)
is installed in an environment of changing O
concentration. See Figure
2
3 on page 20 for an installation environment example.
The ambient environment configuration of OMT364 measures ambient
oxygen concentrations of 2 ... 25 %O
, that is, the main difference
2
between this version in comparison with the other two is that the
measurement range does not go all the way down to zero percent O2.
There are also differences in operating temperature ranges between
these configurations, see Figures 1-3 and Table 16 on page 152.
To facilitate easy installation on walls, OMT364 for ambient gas
measurement is available with a wall mounting kit.
20 ___________________________________________________________________M210862EN-A
Chapter 3 ______________________________________________________ Functional Description
CHAPTER 3
FUNCTIONAL DESCRIPTION
Measurement Principle and Sensor Technology
The operation of the SPECTRACAP® sensor used in OMT364 is based
on Tunable Diode Laser Absorption Spectroscopy (TDLAS) method. In
this technology the gas concentration is sensed by measuring the
attenuation of a beam of laser light from a tunable diode laser source in
the sample gas. For oxygen sensing the laser wavelength is selected to
match with one of the characteristic absorption lines of oxygen in the
wavelength range of around 760 nm (0.76 m), in the near infrared
(NIR) region of the electromagnetic spectrum. In the measurement the
diode laser wavelength is continuously modulated to scan across one of
the oxygen absorption lines to generate a periodic signal from a
photodetector, the amplitude of which is proportional to the amount of
oxygen on the path of the laser beam. Figure 4 on page 22 illustrates the
oxygen absorption spectrum and Figure 5 on page 22 the modulation of
the laser wavelength.
VAISALA_______________________________________________________________________ 21
User's Guide ______________________________________________________________________
759 760 761 762 763 764 765 766 767
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
WAVELENGTH (NM)
TRANSMISSION (%, 30 CM)
0512-049
Figure 4 O2 Absorption Spectrum Around the 760 nm Near
Infrared Region
0511-034
Figure 5 Adjacent O2 Absorption Lines and Laser Emission
Peak
22 ___________________________________________________________________M210862EN-A
Chapter 3 ______________________________________________________ Functional Description
Characteristic of the SPECTRACAP® sensor is its inherently good
stability which is obtained due to the continuous reference measurement
built in the measurement algorithm. Furthermore the technology is fast
since no chemical reactions or gas diffusion in sensor materials are
involved - in practice the response time is dictated only by the gas
exchange into the sensor volume and the signal processing time of the
electronics. Furthermore, since the absorption lines of gases are very
narrow and unique by nature, there is no direct cross sensitivity to other
gases in the measurement.
Construction of the OMT364 Probe
The SPECTRACAP® sensor of the OMT364 has been built into a
compact and robust probe for direct insertion into the measurement
location. In the probe the diode laser light source and the photodetector
measuring the light have been placed behind a protective window, and
the light is directed onto the photodetector using a focusing mirror at the
far end of the probe. Figure 6 on page 23 illustrates the probe design and
how the beam of light goes once back and forth inside the probe.
0511-035
Figure 6 Schematic of Probe Design
The following numbers refer to Figure 6 on page 23:
1 = Light source
2=Mirror
3 = Light detector
The probe is constructed from AISI 316 stainless steel for good
resistance to aggressive chemicals and demanding environments. Other
sample wetted materials are the thin film coating of the optical surfaces
(MgF2 on the lens, SiN on the mirror), and the Kalrez® Spectrum 6375
VAISALA_______________________________________________________________________ 23
User's Guide ______________________________________________________________________
O-ring. The probe design incorporates also an encapsulated Pt1000
temperature sensor for making an on-line temperature compensation to
the measurement, and a heating resistor heats the protective window to
prevent condensation. The probe is also equipped with a stainless steel
mesh filter (additional porous PTFE filter available as an option) to
prevent dust or particles from entering inside the probe. If this should
nevertheless happen the algorithm used with the SPECTRACAP®
sensor has been designed to minimize the effects of light obstruction,
and even to issue a maintenance warning signal informing of excessive
light loss in the sensor well before the measurement quality is affected.
Eye Safety
The OMT364 is eye-safe. Laser radiation in OMT364 is emitted
through the laser radiation aperture, as shown in Figure 7 on page 24.
No laser radiation is emitted outside the probe, and in normal conditions
it is not possible to look straight into the laser radiation aperture and
place the eye in the path of the laser beam. Therefore normal handling
and operation of OMT364 is eye-safe. Do not place reflective surfaces
(tools, etc.) directly into the probe, since this might cause reflection of
laser radiation outside the probe.
0611-007
Figure 7 OMT364 Laser Eye Safety
24 ___________________________________________________________________M210862EN-A
Chapter 3 ______________________________________________________ Functional Description
NOTE
CAUTION
Optical radiation of SPECTRACAP® cannot ignite any hazardous gas
when operating pressure is between 0.8 ... 1.4 bar.
Do not use OMT364 in situations where process pressure can even
sporadically exceed 1.4 bar.
The Minimum Ignition Energy is inversely proportional to the
pressure of the gas or vapour. In practise this means, that the level of
energy (optical radiation) needed to cause an ignition is substantially
reduced as pressure increases.
VAISALA_______________________________________________________________________ 25
User's Guide ______________________________________________________________________
26 ___________________________________________________________________M210862EN-A
Chapter 4 _______________________________________________________________ Installation
CHAPTER 4
INSTALLATION
Selecting the Location
When selecting the installation location for your version of the
OMT364, remember to consider the division separation. If desired, the
entire transmitter can be installed in a Class I, Division 2 environment
as shown in Figure 3 on page 20.
By using the mounting flange or the sampling cell, the measurement
probe can be placed in a Class I, Division 1 environment, while the rest
of the transmitter remains in a Class I, Division 2 environment. Refer
to Figure 1 on page 19 and Figure 2 on page 19.
The main advantage of OMT364 is its low sensitivity to sample gas
conditions, meaning that the requirements for costly and complicated
sample conditioning systems are minimal. In many applications
OMT364 can be installed directly into the process using a mounting
flange. There is no need for sampling and sample conditioning
equipment. This type of setup also provides a real-time measurement
with no sampling or sample switching delays.
VAISALA_______________________________________________________________________ 27
User's Guide ______________________________________________________________________
Transmitter Dimensions
Figure 8 on page 28 presents the dimensions of the OMT364 transmitter
in mm/inch.
0806-059
Figure 8 OMT364 Dimensions
Chemical Tolerance
The OMT364 transmitter contains several O-ring sealings. The sealings
are made of Kalrez® Spectrum 6375 (perfluoroelastomer with a
fluorinated backbone). Kalrez sealings have an excellent tolerance for
aggressive solvents and chemicals, for example:
- Alcohols (butanol, ethanol, isopropanol, methanol)
- Aromatic hydrocarbons (benzene, toluene, xylene)
- Esters (ethyl acetate)
- Ethers (dietyl ether)
- Ketones (acetone)
28 ___________________________________________________________________M210862EN-A
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