Vaisala Spectracap OMT355 User manual

USER'S GUIDE
Vaisala SPECTRACAP®
Oxygen Transmitte
r
OMT355
M210735EN-D

PUBLISHED BY
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2008
No part of this manual may be reproduced in any form or by any means,
electronicormechanical(includingphotocopying),normayitscontents
becommunicated to athird party withoutpriorwritten permissionof 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]
FIN-00421 Helsinki
Finland

________________________________________________________________________________
VAISALA________________________________________________________________________ 1
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
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
License Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
CHAPTER 2
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Introduction to Vaisala SPECTRACAP® Oxygen
Transmitter OMT355 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Oxygen Measurement Range . . . . . . . . . . . . . . . . . . . . . . . .17
OMT355 for In-Line and Sampling Cell Mounting . . . . . . .18
Ambient Gas Measurement Version of OMT355 . . . . . . . .20
CHAPTER 3
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Measurement Principle and Sensor Technology . . . . . . . .21
Construction of OMT355 Probe . . . . . . . . . . . . . . . . . . . . . .23
Eye Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
CHAPTER 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Selecting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Chemical Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
OMT355 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Temperature Conditions of Installation Location . . . . . . . .27
Powerful Light Sources Near the Oxygen Measurement
Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Maximum Allowed Installation Angle . . . . . . . . . . . . . . . . .28
Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Process Conditions in Regard to Mounting Options . . . . .29
Flange Mounted for In-Line Process Gas Measurement . .31

________________________________________________________________________________
2 _______________________________________________________________________________
Suitable Process Flanges . . . . . . . . . . . . . . . . . . . . . . 31
Filter Recommendation . . . . . . . . . . . . . . . . . . . . . . . . 31
Mounting with Flange Adapter . . . . . . . . . . . . . . . . . . . 32
Mounting with Sampling Cell . . . . . . . . . . . . . . . . . . . . . . .34
Filter Recommendation . . . . . . . . . . . . . . . . . . . . . . . . 34
Mounting with Wall Mounting Bracket . . . . . . . . . . . . . 36
Tubing Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Installation Instructions for Swagelok Tube Fittings 36
Sampling Cell Instructions . . . . . . . . . . . . . . . . . . . . . . 37
Mounting OMT355 for Ambient Gas Measurement . . . . . .39
Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Signal and Power Supply Wiring . . . . . . . . . . . . . . . . . . . .41
Connecting OMT355 with Optional 8-Pin Connector. . 44
CHAPTER 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Device Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Keypad, Display and LEDs . . . . . . . . . . . . . . . . . . . . . . . .45
Service Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Installing the Driver for the USB Cable . . . . . . . . . . . . 46
Customer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Local Interface (Keypad and Display) . . . . . . . . . . . . . . . . .48
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Error Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Service Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Customer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
General Instructions for Using Functions . . . . . . . . . . . . . .52
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Serial Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
List of Serial Commands . . . . . . . . . . . . . . . . . . . . . . . . . .57
Outputting Measurement Results . . . . . . . . . . . . . . . . . . . .58
Start Continuous Output Command (R) . . . . . . . . . . . . . . .58
Stop Continuous Output Command (S) . . . . . . . . . . . . . . .59
Show/Set Continuous Output Interval Command (INTV) . .59
Send Measurement Results Command (SEND) . . . . . . . .59
Show/Set Serial Communications Mode Command
(SMODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Show/Set Serial Communications Mode for Line 2
Command (SMODE2) . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Show/Set Serial Communications Settings Command
(SERI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

________________________________________________________________________________
VAISALA________________________________________________________________________ 3
Show/Set Serial Communication Settings for Line 2
Command (SERI2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Show Serial Line 1 Status Command (SCI1) . . . . . . . . . . .63
Show Serial Line 2 Status Command (SCI2) . . . . . . . . . . .63
Show Measurement Status Command (MEA) . . . . . . . . . .64
Oxygen Statistics Display Function . . . . . . . . . . . . . . . . . .64
Temperature Statistics Display Function . . . . . . . . . . . . . .65
Formatting Measurement Results . . . . . . . . . . . . . . . . . . . .65
Set Output Format Command (FORM) . . . . . . . . . . . . . . .65
Show/Set Date Command (DATE) . . . . . . . . . . . . . . . . . .67
Show/Set Time Command (TIME) . . . . . . . . . . . . . . . . . . .68
Networking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Show/Set Device Address Command (ADDR) . . . . . . . . .69
Open Communications Line Command (OPEN) . . . . . . . .69
Close Serial Line in Poll Mode Command (CLOSE) . . . . .70
Set Echoing Mode Command (ECHO) . . . . . . . . . . . . . . .70
Accessing Service Level Commands . . . . . . . . . . . . . . . . .71
Issue Password Command (PASS) . . . . . . . . . . . . . . . . . .71
Issue Password Function (Pas) . . . . . . . . . . . . . . . . . . . . .72
Analog Output Calibration . . . . . . . . . . . . . . . . . . . . . . . . . .73
Calibrate Analog Output Command (ICAL) . . . . . . . . . . . .73
Analog Output Scaling and Settings . . . . . . . . . . . . . . . . . .73
Scale Analog Output Function (Ascl) . . . . . . . . . . . . . . . . .73
Show/Set Output Parameters Command (OUT_PARAMS) 75
Analog Output Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Set Test Current to Analog Output Command (ITEST) . . .75
Test Analog Output Function (Aou) . . . . . . . . . . . . . . . . . .76
Relay Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Show/Set Relay Operating Mode Command
(RELAY_MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Show/Set Relay Trigger Points Command (RSEL) . . . . . .78
Test Alarm Relay Function (Ala) . . . . . . . . . . . . . . . . . . . .78
Device Information and Other General Commands . . . . . .79
Show Information about the Device Command (?) . . . . . .79
Show Information about the Device Overriding POLL
Mode Command (??) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Show Measuring Parameters Command (CALCS) . . . . . .80
Show Calibration Information (CINFO) . . . . . . . . . . . . . . .80
Show Display Board Status Command (DB) . . . . . . . . . . .81
List Commands Command (HELP) . . . . . . . . . . . . . . . . . .81
Show Laser Temperature Controller Status Command
(LTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Show Output Status Command (OUT) . . . . . . . . . . . . . . .82
Show All Modifiable Parameter Values (PARAM) . . . . . . .83
Measure Signal Level Command (SIL) . . . . . . . . . . . . . . .84
Signal Level Display Function (Sil) . . . . . . . . . . . . . . . . . .84
Show Statistical Information Command (STATS) . . . . . . .85
Show Status of Subfunctions Command (STATUS) . . . . .85
Show Product Name and Software Version Command
(VERS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

________________________________________________________________________________
4 _______________________________________________________________________________
Memory Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Save Parameters Command (SAVE) . . . . . . . . . . . . . . . . .86
Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Reset Command (RESET) . . . . . . . . . . . . . . . . . . . . . . . . .87
Reset Function (Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
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 OMT355) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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) . . . . . . . . . . . . . . . . .109
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

________________________________________________________________________________
VAISALA________________________________________________________________________ 5
Possible Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
One-Point Adjustment Using Serial Line . . . . . . . . . . . . .110
Make One-Point Adjustment Command (COXY1). . . 110
One-Point Adjustment Procedure Using Serial Line . 111
One-Point Adjustment Using Local Interface . . . . . . . . . .113
One-Point Adjustment Function (CAL1). . . . . . . . . . . 113
One-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Two-Point Adjustment Using Serial Line . . . . . . . . . . . . .115
Make Two-Point Adjustment Command (COXY2). . . 115
Two-Point Adjustment Procedure Using Serial Line . 116
Two-Point Adjustment Using Local Interface . . . . . . . . . .119
Two-Point Adjustment Function (CAL2). . . . . . . . . . . 119
Two-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Restoring Factory Calibration . . . . . . . . . . . . . . . . . . . . .121
Restore Factory Calibration Command
(FCRESTORE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Restore Factory Calibration Function (Fac). . . . . . . . 121
CHAPTER 8
CALIBRATION AND ADJUSTMENT (AMBIENT GAS MEASUREMENT
VERSION OF OMT355) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
Hardware Arrangements for Calibration and
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
Gas Feed Setup for Calibration and Adjustment . . . . . . .125
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Using Bottled Calibration Adjustment Gas. . . . . . . . . 125
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
Using Ambient Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
Using Calibration Gas . . . . . . . . . . . . . . . . . . . . . . . . . . .127
Information on Calibration Gases . . . . . . . . . . . . . . . . . .129
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
Lock Outputs for Calibration Command (ADJUST) . . . . .129
Calibration Check Function (Cal.C) . . . . . . . . . . . . . . . . .130
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
Possible Adjustments for Ambient Measurement Version 131
One-Point Adjustment Using Serial Line . . . . . . . . . . . . .132
One-Point Adjustment Command (COXY1). . . . . . . . 132
One-Point Adjustment Procedure Using Serial Line . 133
One-Point Adjustment Using Local Interface . . . . . . . . . .135
One-Point Adjustment Function (CAL1). . . . . . . . . . . 135
One-Point Adjustment Procedure Using Local
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Restoring Factory Calibration . . . . . . . . . . . . . . . . . . . . .136
Restore Factory Calibration Command
(FCRESTORE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Restore Factory Calibration Function (Fac). . . . . . . . 137

________________________________________________________________________________
6 _______________________________________________________________________________
CHAPTER 9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Field Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Cleaning the Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Using Solvents to Clean the Optics . . . . . . . . . . . . . . 140
Cleaning the Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Cleaning the Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Replacing Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . .142
OMT355 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Cleaning and Changing the Stainless Steel Mesh
Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Changing the PTFE Filter. . . . . . . . . . . . . . . . . . . . . . 143
Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . .144
CHAPTER 10
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Error Detection During Operation . . . . . . . . . . . . . . . . . . .146
Error Control and Error Categories . . . . . . . . . . . . . . . . .147
Fatal Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Nonfatal Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Emergency Shutdown State . . . . . . . . . . . . . . . . . . . 149
Show Error Control Status (ERR) . . . . . . . . . . . . . . . . . .149
Show Error Log (ERRL) . . . . . . . . . . . . . . . . . . . . . . . . . .150
Show Detected Errors (ERRS) . . . . . . . . . . . . . . . . . . . . .150
Show Error Table (ERRT) . . . . . . . . . . . . . . . . . . . . . . . .150
Error Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Error Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Return Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Vaisala Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . .153
CHAPTER 11
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
APPENDIX A
FLANGE PREPARATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . .159
APPENDIX B
HUMIDITY CONVERSION TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161

________________________________________________________________________________
VAISALA________________________________________________________________________ 7
List of Figures
Figure 1 Flange Mounted Vaisala SPECTRACAP® Oxygen
Transmitter OMT355 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 2 OMT355 with Sampling Cell. . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 3 OMT355 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 OMT355 Laser Eye Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Figure 8 OMT355 Dimensions in mm. . . . . . . . . . . . . . . . . . . . . . . . . . .26
Figure 9 Installation Angle Limitations in High Humidities . . . . . . . . . . .29
Figure 10 OMT355 Transmitter with Flange Adapter. . . . . . . . . . . . . . . .31
Figure 11 Dimensions, OMT 355 Flange Mounted . . . . . . . . . . . . . . . . .33
Figure 12 OMT355 Transmitter with Sampling Cell. . . . . . . . . . . . . . . . .34
Figure 13 Sample Gas Treatment System. . . . . . . . . . . . . . . . . . . . . . . .35
Figure 14 Swagelok Tube Fitting Instructions . . . . . . . . . . . . . . . . . . . . .37
Figure 15 Detaching Sampling Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Figure 16 Dimensions, OMT355 with Sampling Cell . . . . . . . . . . . . . . . .38
Figure 17 OMT355 for Ambient Gas Measurement with Wall Mounting
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Figure 18 OMT355 Wall Mounted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Figure 19 Dimensions and Drilling Holes, Wall Mounting Bracket (Right)
and Flange Adapter (Left) . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 20 Connections/Local Interface Layout. . . . . . . . . . . . . . . . . . . . .42
Figure 21 Optional 8-Pin Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Figure 22 OMT355 Display Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Figure 23 Effect of Process Pressure Compensation . . . . . . . . . . . . . . .91
Figure 24 Attaching OMT355 Probe into Calibration Chamber . . . . . . .103
Figure 25 Flow Rate vs. Pressure, Back Pressure Valve Swagelok
SS-CHSM2-KZ-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
Figure 26 Oxygen Readings in Relative Humidity . . . . . . . . . . . . . . . . .108
Figure 27 Attaching OMT355 Probe into Sample Cell . . . . . . . . . . . . . .126
Figure 28 Oxygen Readings in Alternating Humidity . . . . . . . . . . . . . . .127
Figure 29 Calibration Gas O2 Concentration Readings for Ambient
Gas Measurement Version of OMT355 . . . . . . . . . . . . . . . . .128
Figure 30 Location of Mirror in Oxygen Measurement Probe . . . . . . . .140
Figure 31 Location of Lens in Oxygen Measurement Probe . . . . . . . . .141
Figure 32 Stainless Steel Mesh and PTFE Filters . . . . . . . . . . . . . . . . .142

________________________________________________________________________________
8 _______________________________________________________________________________