GE Sensing XMO2 Operating Manual
GE
Measurement & Control Oxygen Analysis
XMO2-IDM
User’s Manual
910-141 Rev. F
October 2013
XMO2-IDM
Oxygen Analyzer
User’s Manual
910-141 Rev. F
October 2013
ATTENTION! This manual should be used only for XMO2 units with the IDM User Program (Option D = 3 or 4).
For XMO2 units with the Terminal User Program (Option D = 1 or 2), manual number 910-141A
must be used.
www.ge-mcs.com
©2013 General Electric Company. All rights reserved.
Technical content subject to change without notice.
[no content intended for this page]
ii
Preface
Information Paragraphs
Note: These paragraphs provide information that provides a deeper understanding of the situation, but is not
essential to the proper completion of the instructions.
IMPORTANT: These paragraphs provide information that emphasizes instructions that are essential to proper setup of
the equipment. Failure to follow these instructions carefully may cause unreliable performance.
CAUTION! This symbol indicates a risk of potential minor personal injury and/or severe
damage to the equipment, unless these instructions are followed carefully.
WARNING! This symbol indicates a risk of potential serious personal injury, unless these
instructions are followed carefully.
Safety Issues
WARNING! It is the responsibility of the user to make sure all local, county, state and national
codes, regulations, rules and laws related to safety and safe operating conditions are met for
each installation.
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards,
regulations, or laws applicable to safety.
Working Area
WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As
equipment can move suddenly and without warning, do not enter the work cell of this equipment
during automatic operation, and do not enter the work envelope of this equipment during
manual operation. If you do, serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out
before you perform maintenance procedures on the equipment.
XMO2 User’s Manual iii
Preface
Auxiliary Equipment (cont.)
Qualification of Personnel
Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.
Personal Safety Equipment
Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary equipment.
Examples include safety glasses, protective headgear, safety shoes, etc.
Unauthorized Operation
Make sure that unauthorized personnel cannot gain access to the operation of the equipment.
Environmental Compliance
Waste Electrical and Electronic Equipment (WEEE) Directive
GE Measurement & Control Solutions is an active participant in Europe’s Waste Electrical and Electronic Equipment
(WEEE) take-back initiative, directive 2002/96/EC.
The equipment that you bought has required the extraction and use of natural resources for its production. It may
contain hazardous substances that could impact health and the environment.
In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the natural
resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle most of the
materials of your end life equipment in a sound way.
The crossed-out wheeled bin symbol invites you to use those systems.
If you need more information on the collection, reuse and recycling systems, please contact your local or regional
waste administration.
Visit http://www.ge-mcs.com/en/about-us/environmental-health-and-safety/1741-weee-req.html
take-back instructions and more information about this initiative.
iv XMO2 User’s Manual
for
Contents
Chapter 1. Features and Capabilities
1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Basic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.4 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.1 The XMO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.4.2 The Sample System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.4.3 Long Cables (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.4.4 Power Supply (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.4.5 The TMO2D Display/Controller (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Chapter 2. Installation
2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.2 Installing the XMO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.3 Installing the Sample System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.3.1 A Basic System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.3.1 Wiring the XMO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.3.2 CE Mark Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.3.3 Grounding the XMO2 Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.3.4 Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.3.5 Accessing Terminal Blocks TB1 and TB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.3.6 Wiring the Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.4 Establishing the RS232 Communication Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.5 Connecting to Other Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.5.1 The PS5R-C24 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.5.2 TMO2D Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.5.3 LDP Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.5.4 XDP Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.5.5 Moisture Image/Monitor Series Analyzers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.5.6 System 1 Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Chapter 3. Startup & Operation
3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.2 Powering Up the XMO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.3 Establishing a Sample Gas Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.4 Analog Output Calibration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.5 Factory Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.6 Enhancing the Factory Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.7 Required Calibration Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.8 Preparing for Field Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.9 One-Gas Pushbutton Field Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
XMO2 User’s Manual v
Contents
3.10 Two-Gas Pushbutton Field Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
3.10.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
3.10.2 Zero Gas Pushbutton Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
3.10.3 Span Gas Pushbutton Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
3.11 IDM Digital Communication Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
3.12 The Edit Functions Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.13 The Field Cal Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3.13.1 Perform Cal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3.13.2 Configure Cal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
3.13.3 Calibration Drifts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
3.13.4 Clear Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
3.13.5 Hold Last Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.14 Changing the 4-20 mA Analog Output Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
3.14.1 4-20mA Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
3.14.2 4mA Cal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
3.14.3 20 mA Cal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
3.14.4 4-20mA Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
3.14.5 %O2 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Chapter 4. Programming with Instrument Data Manager
4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
4.2 The Edit Functions Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.2.1 The Error Handler Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
4.2.2 Total Drift Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
4.2.3 All Other Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
4.3 The Factory Cal Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
4.3.1 Background Gas Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
4.3.2 Pressure Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
4.4 The Advanced Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.4.1 Fast Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
4.4.2 Language. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
4.4.3 Meter ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Chapter 5. Specifications
5.1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
5.2 Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
5.3 Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
5.4 Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
5.5 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
5.6 Calibration Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
5.7 A Calibration Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
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Appendix A. Two Typical Applications
A.1 Blanketing Gases in Hydrocarbon Liquid Storage Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
A.1.1 The Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
A.1.2 Equipment Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
A.1.3 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
A.1.4 Previous Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
A.2 Reactor Feed Gases in Formaldehyde Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
A.2.1 The Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
A.2.2 Equipment Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
A.2.3 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
A.2.4 Previous Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Appendix B. Outline and Installation Drawings
Appendix C. IDM Menu Maps
Appendix D. Programming with PanaView
D.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
D.2 Wiring the RS232 Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
D.3 Setting Up the Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
D.4 Adding the XMO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
D.5 Changing Meter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Appendix E. CE Mark Compliance
E.1 CE Mark Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
E.2 EMI Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
E.3 Wiring the Signal Connections for the Weatherproof Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
E.4 Wiring the Signal Connections for the Explosion/Flameproof Version. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Appendix F. Certifications
F.1 EC-Type Examination Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
F.2 IECEx Certificate of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
XMO2 User’s Manual vii
Contents
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viii XMO2 User’s Manual
Chapter 1. Features and Capabilities
Chapter 1. Features and Capabilities
1.1 Introduction
This chapter introduces you to the features and capabilities of the GE XMO2 Thermoparamagnetic Oxygen
Transmitter. The following specific topics are discussed:
• Basic Features - a brief discussion of the XMO2 Transmitter’s basic features and capabilities
• Theory of Operation - details on the sensor’s construction and how the measurements are made
• System Components - a description of the available XMO2 options and the required sample system
Note: The XMO2 technical specifications and ordering information can be found in Chapter 5, Specifications.
1.2 Basic Features
The XMO2 Transmitter measures the concentration of oxygen in the 0-100% range in a variety of gas mixtures, and it
provides a 4-20 mA analog output signal that is proportional to the oxygen concentration. In performing these
measurements, the microprocessor-based XMO2 provides automatic oxygen signal compensation for background gas
composition and/or pressure variations. In addition, the XMO2 is equipped with Fast-Response software, real-time
error detection, and push-button field calibration.
The XMO2 Transmitter offers several unique design features:
• Ultra-stable thermistors and a measuring cell that is temperature-controlled at 45°C (113°F) provide excellent
zero and span stability, as well as a high tolerance to ambient temperature variations. Optional measurement
cell operating temperatures of 60°C (140°F) and 70°C (158°F) are available for special applications.
• The measurement cell design is resistant to contamination and relatively tolerant of sample gas flow rate
variations. As it has no moving parts, the XMO2 performs reliably under the shock and vibration found in
many industrial applications.
• The XMO2’s unique “bridge-within-a-bridge” measurement circuit and microprocessor-based operation
automatically compensate the oxygen signal for variations in the magnetic and thermal properties of the
background gas that would otherwise cause measurement errors.
XMO2 User’s Manual 1
Chapter 1. Features and Capabilities
1.2 Basic Features (cont.)
At high oxygen concentrations, changes in atmospheric pressure have significant effects on the measured
•
oxygen level. However, the XMO2 provides automatic microprocessor-based atmospheric pressure
compensation of the oxygen signal for these applications.
• The XMO2 modular construction means that the unit can be field-calibrated quickly and easily. Also, the
plug-in measuring cell can be replaced with a pre-calibrated spare in just minutes.
• The XMO2 transmitter, which is available in weatherproof or explosion-proof packaging, is designed to be
installed as close as possible to the process sample point. It can be located up to 450 ft (150 m) from the control
system, display, or recorder using standard GE cables.
• An RS232 serial communications interface and a multi-level, menu-driven User Pr ogram provide a convenient
means for calibrating and programming the XMO2
• Internal software algorithms along with user-programmed calibration data provide compensation of the oxygen
signal for background gas composition, atmospheric pressure, or both background gas composition and
atmospheric pressure.
• GE proprietary Fast-Response software provides enhanced response times to track rapidly changing processes.
• Sophisticated error-checking software with user-programmable defaults and error limits detects abnormal
measurement conditions.
• Pushbutton adjustment of the 4-20 mA analog output zero and span values is a standard feature with the
XMO2.
• A drift calibration routine provides automatic drift compensation for minor changes in the sensor calibration
setting.
• Programmable recalibration is accomplished in the field via a computer interface, with no potentiometers to
adjust.
2 XMO2 User’s Manual
Chapter 1. Features and Capabilities
Induced Gas
Flow
Magnetic
Field
Upper
Measurement
Chamber
Lower
Flow-Through
Chamber
Sample
Inlet
Sample
Outlet
Wind
Receiving
(Warmed)
Thermistor
Wind
Generating
(Cooled)
Thermistor
1.3 Theory of Operation
The XMO2 measures the concentration of oxygen in a gas mixture by utilizing the unique paramagnetic properties of
oxygen.
As its magnetic susceptibility is approximately 100 times greater than that of most other common gases, oxygen can be
easily distinguished from these gases based on its behavior in a magnetic field. Also, oxygen’s magnetic susceptibility
varies inversely with temperature. Therefore, by carefully combining a magnetic field gradient and a temperature
gradient within the XMO2 measuring cell, an oxygen-containing gas mixture can be made to flow along these
gradients. This induced gas flow is known as a magnetic wind. The intensity of this magnetic wind depends on the
concentration of oxygen in the gas mixture.
Figure 1 below shows a flow schematic for the XMO2 measuring cell. Permanent magnets within the cell create a
magnetic field, while the cell temperature is controlled at 45°C (113°F) to maintain thermal equilibrium. In addition,
the cell contains two pairs of highly-stable, glass-coated thermistors. One thermistor of each pair located inside the
magnetic field and the other thermistor of each pair located outside the field. Because the thermistors are electrically
heated, a temperature gradient is thus created within the magnetic field.
XMO2 User’s Manual 3
Figure 1: Measuring Cell Flow Schematic
Chapter 1. Features and Capabilities
Induced Gas Flow Induced Gas Flow
Wind Receiving
(Warmed)
Thermisters
Wind Generating
(Cooled)
Thermisters
Magnetic Field
1.3 Theory of Operation (cont.)
Figure 2 below shows the arrangement of the two thermistor pairs.
Figure 2: Arrangement of the Thermistor Pairs
A small portion of the sample gas flow is allowed to diffuse from the lower chamber into the upper chamber of the
measurement cell. If the sample gas contains a paramagnetic gas such as oxygen, it is attracted to the magnetic field,
causing the sample gas pressure to become locally higher in the center of the chamber. At the same time, the sample gas
pressure is slightly lower near the thermistors because the high thermistor temperature causes the paramagnetic
properties of oxygen to decrease. This slight gradient in sample gas pressure causes the sample gas to flow outward
from the center of the magnetic field and over the thermistors. As a result, the inner, wind-generating thermistors
decrease in temperature as they lose heat to the magnetic wind. This causes a temperature gradient between the cooler
inner thermistors and the warmer outer thermistors.
4 XMO2 User’s Manual
Chapter 1. Features and Capabilities
R1
W1
W2
R2
V02
Vcomp
W1, W2 = Wind Generating (Cooled) Thermistors
R1, R2 = Wind Receiving (Warmed) Thermistors
1.3 Theory of Operation (cont.)
Figure 3 below shows how the two thermistor pairs are connected in series in an electronic bridge circuit. The bridge
circuit becomes unbalanced as the electrical resistance of the thermistors changes with temperature. This circuit
imbalance causes a voltage drop, which is proportional to the oxygen concentration in the gas being measured, to
appear across the bridge circuit.
Figure 3: Thermistor Bridge Circuit
As the background gases that comprise the balance of an oxygen-containing gas mixture change, the magnetic and
thermal properties of the gas mixture also change. This affects the accuracy and response of any paramagnetic oxygen
analyzer. To compensate for such variations, the XMO2 has a unique “bridge-within-a-bridge” design.
The oxygen measuring bridge circuit described on the previous page is itself one arm of another compensation bridge
circuit that maintains the oxygen bridge at a constant temperature as background gas composition changes. The
electrical power change necessary to keep the oxygen bridge at constant temperature is a function of the thermal
properties of the background gas. Therefore, this power fluctuation provides a signal that is related to the thermal
conductivity of the background gas. That signal is then used to reduce the effects of the background gas variation on the
oxygen span point measurement.
In addition to maintaining a constant oxygen bridge temperature, the XMO2 microprocessor compensates for any zero
point shift in the oxygen bridge circuit output caused by background gas changes.
Finally, the bridge circuit voltage is further adjusted for variations in background gas composition and/or atmospheric
pressure by internal, microprocessor-based compensation algorithms. The compensated signal is then amplified and
converted to a 4-20 mA analog output that is proportional to the concentration of oxygen in the gas mixture.
XMO2 User’s Manual 5
Chapter 1. Features and Capabilities
1.4 System Components
The basic XMO2 measurement system consists of an XMO2 Transmitter mounted in a Sample System. The sample
system is mandatory, and can either be provided by GE or constructed according to our recommendations.
1.4.1 The XMO2 Transmitter
The XMO2 transmitter is self-contained, consisting of the oxygen sensor and associated electronics. It requires a 24
VDC power input @1.2 A maximum at power-up, and it provides a 4-20 mA analog output signal that is proportional
to the oxygen concentration of the sample gas and has fully programmable zero and span points. Also provided is an
RS232 digital output for oxygen concentration, background gas, and atmospheric pressure signals. Programming, and
calibration of the unit may also be performed via this interface.
All XMO2 transmitters include a 10 ft (3 m), 4-conductor cable for connecting the power input and the 4-20 mA analog
output. Optional XMO2 accessories available from GE include:
• Power/analog output cable lengths of up to 450 ft (150 m)
• 24 VDC power supply (Model PS5R-C24)
• 3-conductor cable with a DB9 (male or female) or DB25 (male or female) connector for connecting the XMO2
RS232 digital output to external devices
The XMO2 is designed to be installed in a sample system as close as possible to the process sample point. It is
available in two environmental packages:
• Weatherproof
• Explosion-proof/Flameproof (with gas inlet and outlet flame arrestors)
The XMO2 transmitter, which is shown in Figure 4 on page 7, can be configured for the following standard oxygen
ranges:
0 to 1% 0 to 25%
0 to 2% 0 to 50%
0 to 5% 0 to 100%
0 to 10% 80 to 100%
0 to 21% 90 to 100%
*Pressure compensation is required
*
*
*
*
6 XMO2 User’s Manual
1.4.1 The XMO2 Transmitter (cont.)
Inlet
Flame Arrestor
Outlet
Flame Arrestor
Chapter 1. Features and Capabilities
The standard XMO2 transmitter maintains the measurement cell at an operating temperature of 45°C (113°F). An
optional 60° (140°F) or 70°C (158°F) cell operating temperature is available upon request.
Note: The 60° (140°F) or 70°C (158°F) cell operating temperatures should be selected only when necessary, as the
higher cell operating temperature results in reduced sensitivity.
XMO2 User’s Manual 7
Figure 4: The XMO2 Transmitter
Chapter 1. Features and Capabilities
1.4.2 The Sample System
A sample system is mandatory for use with the XMO2 transmitter. The specific design of the sample system depends
on the conditions of the sample gas and the requirements of the application. At a minimum, the sample system should
include a sample gas flowmeter and a gas flow regulator valve.
In general, the sample system must deliver a clean, representative sample of the gas mixture to the XMO2 transmitter at
a temperature, pressure, and flow rate that are within acceptable limits. The standard XMO2 transmitter sample gas
conditions are as follows:
• -20° to +40°C (-4° to +104°F), at the standard measurement cell operating temperature of 45°C (113°F)
• Atmospheric pressure
• 1.0 SCFH (500 cc/min) flow rate
GE offers sample systems for a wide variety of applications. A typical sample system for use with the XMO2
transmitter is shown in Chapter 2, Installation. For assistance in designing your own sample system, please consult the
factory.
IMPORTANT: ATEX compliance requires both:
• Fast Response calibration of the XMO2 transmitter
• Pressure Compensation of the XMO2 or constant control of the sample system pressure.
1.4.3 Long Cables (optional)
GE provides a standard 10 ft (3 m), 4-conductor, col or -coded cable with each XMO2 to connect to the power input and
the analog output. Optional cables are available in lengths up to 450 ft (150 m) as P/N X4(*), where * specifies the
length in feet. For longer cables or to use your own cable, refer to Chapter 2, Installation, for recommendations.
1.4.4 Power Supply (optional)
The XMO2 requires 24 VDC input power at a maximum start-up current of 1.2 A. The GE PS5R-C24 power supply
may be used to convert 100-240 VAC to the required 24 VDC.
1.4.5 The TMO2D Display/Controller (optional)
The GE TMO2D Display/Controller provides a two-line x 24-character back-lit LCD display for the XMO2’ s 4-20 mA
analog output signal. It also permits display and option programming via its keyboard. Additional features include:
recorder outputs, a real time clock, alarm relays, and relays for driving sample system solenoids for automatic zero and
span calibration. For more information on the TMO2D, please contact GE.
8 XMO2 User’s Manual
Chapter 2. Installation
Chapter 2. Installation
2.1 Introduction
This chapter describes how to install the XMO2 transmitter and its sample system. It also contains information on
connecting optional system components. Installation of the XMO2 system consists of three basic steps:
1. Installing the XMO2 transmit ter in the sample system (if you purchased your sample system from GE, this step
has already been done for you)
2. Mounting, plumbing, and wiring the sample system
3. Making wiring connections for power input, 4-20 mA analog output, RS232 digital output, and optional
external devices
2.2 Installing the XMO2 Transmitter
Note: This section applies only if the XMO2 transmitter has not already been installed in the sample system by GE.
The sample system must deliver a clean, representative gas sample to the XMO2 at the proper temperature, pressure
and flow rate. This usually means a clean, dry gas sample that is free of solid and liquid particulates and is delivered at
atmospheric pressure, a temperature no greater than 40°C (104°F), and a flow rate of approximately 1.0 SCFH
(500 cc/min). A typical sample system fo r the XMO2 might include an inlet gas flow regulating needle valve, a sample
gas flow meter, and a pressure gauge.
Note: Because factory calibration of the XMO2 is done at atmospheric pressure and at a flow rate of 1.0 SCFH,
operation of the XMO2 at other pressures and/or flow rates requires a field recalibration to ensure optimum
accuracy.
To install the XMO2 transmitter in the sample system, complete the following steps:
1. Select a location in the sample system that provides at least 9 in. (230 mm) of clearance above the top cover of
the XMO2 for access to the interior of the transmitter enclosure.
2. Mount the XMO2 transmitter in the sample system via its two mounting holes. Be sure that the transmitter is
upright and is level to within ±15°.
3. Use 1/4” stainless steel tubing to connect the sample system Inlet and Outlet fittings to the corresponding
XMO2 ports.
WARNING! For explosion-proof units, be sure to conform to all safety and electrical code
requirements.
XMO2 User’s Manual 9
Chapter 2. Installation
0.875 (22.2)
(685.8)
27.00
25.25
(641.3)
4 places
Ø1/2"
SPAN GAS
INLET
ZERO GAS
INLET
INLET
SAMPLE
OUTLET
SAMPLE
19.25 (488.9)
21.00 (533.4)
9.00
(229.5)
(MIN)
TRANSMITTER
XMO2
0.875 (22.2)
2.3 Installing the Sample System
You can order a complete sample system from GE that is mounted on a steel panel and includes the XMO2 transmitter
and all necessary components and plumbing. Several standard sample systems are available, and custom-designed
sample systems can be built to your exact specifications.
2.3.1 A Basic System
Figure 5 below shows a basic sample system (dwg #732-164) that has been designed for use with the XMO2
transmitter.
Figure 5: Basic XMO2 Sample System (ref. dwg #732-164)
10 XMO2 User’s Manual
Chapter 2. Installation
2.3 A Basic System (cont.)
The sample system shown in Figure 5 on page 10 consists of a painted steel plate with the following components
mounted on it:
• Inlet needle valves for sample, zero, and span gas flow regulation
• Ball valves for flow selection
• An XMO2 transmitter
• A sample gas outlet pressure gauge
• A sample gas flowmeter
Other components, such as a pump, a filter/coalescer, or a pressure regulator could be added to the system if needed.
2.3.0a Mounting the Sample System
To mount the sample system, complete the following steps:
1. Select a location that is as close as possible to the process sampling point. The ambient temperature at this
location should be in the range of -20° to +40°C (-4° to +104°F).
IMPORTANT: For locations where the ambient temperature falls below -20°C (-4°F), install the sample system in a
heated enclosure.
2. Using the mounting holes provided, fasten the sample system to a convenient vertical surface. The system must
be installed in an orientation that keeps the XMO2 transmitter upright and level to within ±15°.
3. After the sample system has been mounted, use 1/4” stainless steel tubing to connect all inlet and outlet lines to
the 1/4” tube fittings on the sample system. The sample line leading from the process to the sample system
should be as short as possible in order to decrease system lag time and to prevent condensation in the line.
Proceed to the next section to begin wiring the system.
CAUTION! Always apply power to the XMO2 transmitter immediately after installation,
especially if it is mounted outdoors or in a humid area.
XMO2 User’s Manual 11
Chapter 2. Installation
Cover
Set Screw
Internal
Ground
Screw
Screw
External
Ground
2.3.1 Wiring the XMO2 Transmitter
This section describes how to make all necessary electrical connections to the XMO2 system.
2.3.2 CE Mark Requirements
CAUTION! To meet CE Mark requirements, all electrical cables must be grounded and shielde d
as described in Appendix E.
2.3.3 Grounding the XMO2 Enclosure
WARNING! The XMO2 transmitter enclosure must be properly grounded.
Connect the external ground screw on the XMO2 enclosure (see Figure 6 below) to a suitable earth ground.
Figure 6: XMO2 Ground Screw Locations
12 XMO2 User’s Manual
Chapter 2. Installation
2.3.4 Cable Specifications
Table 1 below shows the transmitter wiring connections using the standard GE XMO2 4-wire cable [P/N X4(L), where
L = length in ft]. This cable can be used for distances up to 450 ft (150 m).
Table 1: GE 4-Wire XMO2 Cable
Lead Color AWG Terminal
+24 VDC Line Red 22 TB1-1
24 VDC Return Black 22 TB1-2
4-20 mA (+) White 22 TB1-3
4-20 mA (-) Green 22 TB1-4
If you are using your own cable to wire the XMO2, refer to Table 2 below for cable requirements.
Table 2: Non-GE Cable Requirements
MAX. CABLE LENGTH WIRE SIZE
ft m AWG mm
2
450 130 22 0.35
700 200 20 0.60
1,050 320 18 1.00
1,700 500 16 1.20
2,800 850 14 2.00
4,000 1,200 12 3.00
Table 3 below shows the connections for the GE standard 3-wire RS232 cable (P/N 704-667, -668, -669, or -670-L,
where L = length in ft), which is available with a DB-9 or a DB-25 connector (male or female). This cable is available
in standard lengths of 6 ft and 12 ft.
Table 3: GE 3-Wire RS232 Cable
Lead Color AWG Terminal
RX Red 22 TB2-1
TX White 22 TB2-2
GND Green 22 TB2-3
See EIA-RS Serial Communications (GE document #916-054) for a more detailed discussion of RS232 wiring.
Note: See Figure 64 on page 74 for detailed drawings of the standard GE cables described above.
XMO2 User’s Manual 13
Chapter 2. Installation
1
+24VDC Line (red)
1
2
3
4
2
3
–24VDC Return (black)
+4 to 20mA (white)
–4 to 20 mA (green)
RS232 TX (white)
RS232 GND (green)
2
3
4
1
3
External Ground Screw
Cover
Internal Ground Screw
Set Screw
RS232 RX (red)
1
2
2.3.5 Accessing Terminal Blocks TB1 and TB2
The 24 VDC power input, 4-20 mA analog output, and RS232 digital output wiring connections are made to terminal
blocks TB1 and TB2 inside the XMO2 enclosure (see Figure 7 below). To access this terminal block, loosen the
locking set screw and remove the cover from the transmitter. Then, refer to Figure 7 below for the location and pin
designations of terminal blocks TB1 and TB2.
CAUTION! Do not make any connections to any unused pins on terminal blocks TB1 or TB2.
Figure 7: TB1 and TB2 Terminal Block Connections
Proceed to the next section to begin making connections to terminal blocks TB1 and TB2.
14 XMO2 User’s Manual
Chapter 2. Installation
2.3.6 Wiring the Signal Connections
Complete the following steps to make the signal connections to terminal blocks TB1 and TB2:
1. Install a cable clamp or gland in one of the 3/4” conduit holes.
CAUTION! Be sure to plug the unused conduit hole to maintain the designated weatherproof or
explosion-proof rating.
2. Route the 4-wire and 3-wire (if used) cables through the cable clamp. Then, tighten the clamp to secure the
cable(s).
3. Unplug the TB1 and TB2 connectors by pulling them straight off the printed circuit board, and loosen the
screws on the side of the connectors.
4. Connect the 24 VDC input power leads as follows:
CAUTION! Connecting the +24 VDC (red) lead to any terminal except TB1-1 will damage the
XMO2.
a. Insert the 4-wire cable +24 VDC line (red) lead into pin TB1-1 and tighten the screw.
b. Insert the 4-wire cable 24 VDC return (black) lead into pin TB1-2 and tighten the screw.
5. Connect the 4-20 mA analog output leads as follows:
a. Insert the 4-wire cable + 4-20 mA (white) lead into pin TB1-3 and tighten the screw.
b. Insert the 4-wire cable – 4-20 mA (green) lead into pin TB1-4 and tighten the screw.
6. Connect the option al RS 232 digital output leads as follows:
a. Insert the 3-wire cable RX (red) lead into pin TB2-1 and tighten the screw.
b. Insert the 3-wire cable TX (white) lead into pin TB2-2 and tighten the screw.
c. Insert the 3-wire cable GND (green) lead into pin TB2-3 and tighten the screw.
7. Carefully plug the TB1 and TB2 connectors back onto the printed circuit board, and reinstall the cover on the
XMO2.
8. Connect the other ends of the cables to the 24 VDC power supply, the 4-20 mA input of the display/control
device, and the serial port of the computer or terminal (see the instruction manuals for those devices for
details).
XMO2 User’s Manual 15
Chapter 2. Installation
2.4 Establishing the RS232 Communication Link
Before the XMO2 can be programmed, a link between the built-in RS232 digital output and a computer terminal must
be established. To accomplish this, proceed as follows:
Note: See GE document EIA-RS Serial Communications (916-054) for a details of the RS232 standard.
1. Verify that either Com 1 or Com 2 on the computer is unused.
IMPORTANT: Do not use a virtual Com port, such as Com 3 or Com 4, for communicating with the XMO2.
2. With both the XMO2 and the computer turned OFF, connect a serial cable from the XMO2 to the PC. See
Chapter 2, Installation, for detailed instructions.
CAUTION! Never make any connections to a computer while it is powered up. Damage to the
system may result.
3. Power up the PC and launch the IDM software.
Note: See the IDM User’s Manual (910-185) for information on installing and launching your program.
4. In the Global menu of IDM, select the Preferences option to specify the com port to which your XMO2 has
been connected.
5. For proper communications with the XMO2, the following com port settings must be specified:
• Baud Rate = 9600
• Data Bits = 8
• Parity = None
• Stop Bits = 1
• Flow Control = Xon/Xoff
6. Select the Connect to a New Instrument option, enter the XMO2 ID number (1 to 254), and select OK.
16 XMO2 User’s Manual
Chapter 2. Installation
2.5 Connecting to Other Devices
This section discusses interconnection of the XMO2 transmitter with other GE devices. The following devices are
included:
• PS5R-C24 power supply
• TMO2D display
• LDP display
• XDP display
• Moisture Image/Monitor Series analyzers
• System 1 moisture analyzer
2.5.1 The PS5R-C24 Power Supply
The GE PS5R-C24 power supply converts a 100-240 VAC input to the required 24 VDC output. Figure 8 below shows
the PS5R-C24 connections. As indicated, the AC input Line, Neutral and Ground connections are made to the
terminals along the bottom of the panel, while the DC output +24V line and 24V return connections are made to the
terminals along the top of the panel. See the instructions provided with the power supply for more details.
Figure 8: PS5R-C24 Power Supply Connections
XMO2 User’s Manual 17
Chapter 2. Installation
2.5.2 TMO2D Display
The GE TMO2D Display provides a two-line x 24 character back-lit LCD. It features display and option programming
via the keyboard and it offers recorder outputs, alarm relays, and optional relays for driving sample system solenoids
for automatic zero and span calibration of the XMO2. See Figure 74 on page 84 for an interconnection diagram, and
refer to the TMO2D User’s Manual (910-084) for details on its operation.
2.5.3 LDP Display
The LDP Display provides an integral, regulated 24 VDC power supply, an adjustable 3-digit display to program the
4-20 mA analog input range, two programmable SPDT alarm relays rated for 1A @250 VAC, and an isolated,
independently-adjustable 4-20 mA analog output. The LDP is supplied in an explo sion-proof enclosure t hat is rated for
Cenelec EEx d IIC T6 and IP66 (with an optional gasket). See Figure 74 on page 84 for an interconnection diagram,
and refer to the LDP User’s Manual (910-225) for details on its operation.
2.5.4 XDP Display
The XDP Explosion-proof Display Package provides an integral, regulated 24 VDC power supply, a 3-digit display
with an adjustable 4-20 mA analog input range, two SPDT alarm relays rated for 1A @250 VAC, and an isolated,
independently-adjustable 4-20 mA analog output. See Figure 74 on page 84 for an interconnection diagram, and refer
to the XDP User’s Manual (910-204) for details on its operation and specifications.
2.5.5 Moisture Image/Monitor Series Analyzers
These GE instruments include the Moisture Image Series 1 and Moisture Monitor Series 3 analyzers. These analyzers
accept inputs from a variety of sensors (including the XMO2) and offer graphical and digital interfaces. See Figure 74
on page 84 for interconnection diagrams, and refer to the User’s Manual (910-108 or 110) for details on its operation.
Note: An external 24 VDC power supply (such as the PS5R-C24) is required to use the XMO2 with these analyzers.
2.5.6 System 1 Analyzer
The GE System 1 is a versatile multi-channel analyzer which accepts inputs from any combination of GE moisture,
temperature, oxygen, and thermal conductivity transmitters. See Figure 74 on page 84 for an interconnection diagram,
and refer to the System 1 User’s Manual (900-019) for details on its operation.
Note: An external 24 VDC power supply (such as the PS5R-C24) is required to use the XMO2 with the System 1
analyzer.
18 XMO2 User’s Manual
Chapter 3. Startup & Operation
Chapter 3. Startup & Operation
3.1 Introduction
This chapter provides instructions for starting up and operating the XMO2 system. The following specific topics
discussed:
• Powering up the XMO2 transmitter
• Establishing a sample gas flow
• Calibration of the analog output signal
If you have not already done so, read Chapter 2, Installation, for details on mounting and wiring the XMO2 transmitter ,
the sample system, and any other optional equipment.
3.2 Powering Up the XMO2 Transmitter
The XMO2 transmitter does not have a power switch. It begins taking measurements and generating an analog output
signal in the 0-25 mA range as soon as it is connected to a 24 VDC power source. To power up the system, simply
energize the 24 VDC power supply.
Because the standard XMO2 measurement cell is controlled at a constant 45°C (113°F) operating temperature, allow at
least 30 minutes for the unit to warm up and reach temperature stability before taking any measurements. During this
time, you can establish a sample gas flow through the system, as described in the next section.
3.3 Establishing a Sample Gas Flow
Usually, the XMO2 transmitter is factory-calibrated at a sample gas flow rate of 1.0 SCFH (500 cc/min) and at
atmospheric pressure. Unless otherwise specified on your XMO2 calibration sheet, optional sample system tagging, or
optional sample system instructions, your XMO2 should be operated at atmospheric pressure and at the flow rate listed
in Table 4 below.
Table 4: Recommended Sample Gas Flow Rates
XMO2 Type Flow Rate in SCFH (cc/min)
Weatherproof 1.0 ± 0.5 (500 ± 250)
Explosion-proof 1.0 ± 0.2 (500 ± 100)
Pressure-compensated 0.5 ± 0.5 (250 ± 50)
Note: For optimum performance, operating the XMO2 at conditions other than those used for the factory calibration
requires that the unit be recalibrated at the actual field conditions.
XMO2 User’s Manual 19
Chapter 3. Startup & Operation
3.3 Establishing a Sample Gas Flow (cont.)
To establish a flow of sample gas through the system, complete the following steps (see Figure 5 on page 10 as an
example):
1. Set the sample system ball valves to direct only the sample inlet stream to the inlet port of the XMO2
transmitter.
2. Use the sample inlet needle valve to regulate the flow of sample gas until the flowmeter reads the same flow
rate listed for your unit in Ta ble 4 on page 19.
3. Read the resulting system pressure on the pressure gauge. Make sure that there are no unnecessary flow
restrictions downstream of the sample system.
IMPORTANT: For atmospheric pressure-compensated units, the XMO2 outlet port must be vented directly to
atmosphere with no restrictions, by installing all sample system components and tubing upstream of the
XMO2 transmitter.
4. Take a reading of the XMO2 4-20 mA analog output.
In some applications, pressure changes due to flow rate changes can cause noticeable errors in the oxygen
measurement. In such cases, consider the following corrective measures:
• Reducing the flow rate to the minimum recommended value minimizes flow rate sensitivity. A bypass flow
type sample system (speed loop) allows minimum flow through the XMO2 yet maintains a fast transport of the
sample gas to the XMO2.
• For the fastest transport, minimize the sample line length from the process.
• If you cannot shorten the sample line length, reduce the sample line pressure to les s than 5 psig.
Proceed to the next section to complete the initial XMO2 startup.
20 XMO2 User’s Manual
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