Rosemount Analytical
ROX GT
ROX
O
XYGEN ANALYZERS
I
NSTRUCTION MANUAL
748375-C
GP
OTICE
N
The information contained in this document is subject to change without notice.
Swagelok® is a registered trademark of Crawford Fitting Co.
Manual Part Number 748375-C
August 2000
Printed in U.S.A.
Rosemount Analytical Inc.
4125 East La Palma Avenue
Anaheim, California 92807-1802
C
PREFACE
PURPOSE/SAFETY SUMMARY........................................................................1
SPECIFICATIONS - ROX GT TRACE OXYGEN ANALYZER............................ 3
SPECIFICATIONS - ROX GP PERCENT OXYGEN ANALYZER......................4
CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE............5
RETURNING PARTS TO THE FACTORY.........................................................5
TRAINING ......................................................................................................5
DOCUMENTATION............................................................................................5
COMPLIANCES .................................................................................................6
ONTENTS
SECTION 1. INTRODUCTION
1.1 OVERVIEW.................................................................................................1
1.2 TYPICAL APPLICATIONS ..........................................................................1
1.3 THEORY OF TECHNOLOGY......................................................................2
SECTION 2. INSTALLATION
2.1 UNPACKING...............................................................................................5
2.2 ASSEMBLY................................................................................................. 5
2.3 LOCATION..................................................................................................6
2.4 GASES ......................................................................................................6
2.4.1 Connections...................................................................................6
2.4.2 Gas Specifications.........................................................................7
2.5 ELECTRICAL CONNECTIONS...................................................................9
2.5.1 Line Power Connection..................................................................9
2.5.1.1 115/230 VAC Operation.................................................9
2.5.1.2 24 VDC Operation..........................................................9
748375-C Rosemount Analytical August 2000
ROX GT/ROX GP Oxygen Analyzers
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ONTENTS
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2.5.2 Interconnections............................................................................ 10
2.5.3 Signal Output Connections............................................................ 11
2.5.4 Concentration Alarms.................................................................... 11
2.5.5 Off Range Contact ....................................................................... 11
2.6 INSTALLATION GUIDELINES.................................................................... 12
SECTION 3. STARTUP AND OPERATION
3.1 STARTUP................................................................................................... 13
3.2 CALIBRATION............................................................................................ 13
3.3 OPERATION............................................................................................... 14
3.4 ALARM SETPOINTS .................................................................................. 14
SECTION 4. MAINTENANCE AND TROUBLESHOOTING
4.1 MAINTENANCE OVERVIEW .................................................................... 17
4.2 OXYGEN SENSOR REPLACEMENT......................................................... 17
4.3 POWER FUSE REPLACEMENT................................................................ 20
4.3.1 115/230V AC................................................................................. 20
4.3.2 24V DC ..................................................................................... 20
4.4 PRINTED CIRCUIT BOARDS..................................................................... 21
4.5 ALARM CONFIGURATION......................................................................... 21
4.6 TROUBLESHOOTING................................................................................ 22
S
ECTION
5.1 ROX REPLACEMENT PARTS ................................................................... 25
5. R
5.1.1 Replacement Sensors................................................................... 25
5.1.2 Replacement Parts List.................................................................25
EPLACEMENT PARTS
APPENDIX A. MATERIAL SAFETY DATA SHEETS
MATERIAL SAFETY DATA SHEET (PN 748378)
MATERIAL SAFETY DATA SHEET (PN 748380)
MATERIAL SAFETY DATA SHEET (PN 748381)
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August 2000 Rosemount Analytical 748375-CROX GT/ROX GP Oxygen Analyzers
ONTENTS
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ENERAL PRECAUTIONS FOR HANDLING AND STORING HIGH PRESSURE GAS CYLINDERS
G
ARRA NTY
W
IELD SERVICE AND REP A IR FACILIT IES
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FIGURES
1-1. Electrochemical Sensor Technology..........................................................2
1-2. ROX GT Front View....................................................................................3
1-3. ROX GP Front View...................................................................................3
2-1. ROX Top View (cover removed..................................................................5
2-2. Back Panel Connections............................................................................7
2-3. Recommended Sample Handling Diagram -
Positive Pressure Sample.............................................................8
2-4. Recommended Sample Handling Diagram -
Insufficient Pressure or Flow........................................................8
2-5. Rear Panel Electrical Input Connection.....................................................10
4-1. Sensor Installation......................................................................................19
4-2. ROX GT, GP 115/230V AC Fuse Location.................................................20
4-3. ROX GT 24V DC Fuse Location.................................................................21
4-4. Alarm Switch Location...............................................................................22
TABLES
4-1. Alarm Setting Configuration........................................................................ 22
A-1. Sensor Reference Guide ............................................................................A1
748375-C Rosemount Analytical August 2000
ROX GT/ROX GP Oxygen Analyzers
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ONTENTS
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NOTES
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August 2000 Rosemount Analytical 748375-CROX GT/ROX GP Oxygen Analyzers
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NTRODUCTION
1
1.1 OVERVIEW
This manual describes the ROX GT trace oxygen analyzer and the ROX GP percent
oxygen analyzer of the ROX Series of oxygen analysis instruments.
The ROX GT is designed to determine continuously the concentration of trace oxygen
in a flowing gaseous mixture. The concentration is expressed in parts-per-million by
volume. The ROX GP is designed to measure continuously the concentration of
percent oxygen in a flowing gaseous mixture.
The ROX GT / GP is designed for panel mount or 1/2 19” rack mount, with gas
connections made from the rear. All electronic connections are also made from the
rear including the AC power input.
1.2 TYPICAL APPLICATIONS
Typical applications for the ROX GT include:
• Monitoring trace oxygen contamination in pure nitrogen or argon streams from
air separation facilities.
• Determination of trace oxygen content of inerting atmospheres in heat treat
furnaces.
• Monitoring inert atmosphere glove boxes for oxygen impurity
Typical applications for the ROX GP include:
• Measuring percent impurities in pure gases
• Controlling inerting atmospheres in heat treat applications
• Monitoring oxygen enriching or deficient operations
748375-C Rosemount Analytical August 2000
ROX GT/ROX GP Oxygen Analyzers
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NTRODUCTION
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1.3 THEORY OF TECHNOLOGY
The ROX GT / GP uses an electrochemical sensor technology to achieve the
measurement of oxygen. See Figure 1-1. The sensor is a self contained disposable
unit which requires no maintenance. The sensor utilizes the principle of
electrochemical reaction to generate a signal proportional to the oxygen concentration
in the sample.
The sensor consists of a cathode and anode which are in contact via a suitable
electrolyte. The sensor has a gas permeable membrane which covers the cathode
allowing gas to pass into the sensor while preventing liquid electrolyte from leaking
out.
As the sample diffuses into the sensor, any oxygen present will dissolve in the
electrolyte solution and migrate to the surface of the cathode. The oxygen is reduced
at the cathode. Simultaneously, an oxidation reaction is occurring at the anode
generating four electrons. These electrons flow to the cathode to reduce the oxygen.
The representative half cell reactions are:
Cathode:
4e- + 2H2O + O2 → 4OH
-
Anode:
4OH- + 2Pb → 2PbO + 2H2O + 4e
-
The resultant overall cell reaction is:
2Pb + O2 → 2PbO
This flow of electrons constitutes an electric current which is directly proportional to
the concentration of oxygen present in the sample. In the absence of oxygen, no
oxidation / reduction reaction occurs and therefore no current is generated. This
allows the sensor to have an absolute zero.
Oxygen
Gas PermeableMembrane
Thin Electrolyte Layer
Electrolyte
Anode
OH
-
-
e
Cathode
F
IGURE
2
1-1. E
Current Signal
Contact Plates
LECTROCHEMICAL SENSOR TECHNOLOGY
August 2000 Rosemount Analytical 748375-CROX GT/ROX GP Oxygen Analyzers
ALARM SETPOINT ADJUSTMENT
NTRODUCTION
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F
IGURE
ALARM
SETPOINT
BUTTON
1-2. ROX GT F
CELL BLOCK
COVER
RANGE SELECTOR SWITCH
RONT VIEW
ALARM SETPOINT ADJUSTMENT
LARM
ETPOINT
UTTON
F
IGURE
748375-C Rosemount Analytical August 2000
1-3. ROX GP F
RONT VIEW
CELL BLOCK
COVER
RANGE SELECTOR SWITCH
ROX GT/ROX GP Oxygen Analyzers
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NTRODUCTION
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N
OTES
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August 2000 Rosemount Analytical 748375-CROX GT/ROX GP Oxygen Analyzers
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NSTALLATION
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2.1 UNPACKING
Carefully examine the shipping carton and contents for signs of damage. Immediately
notify the shipping carrier if the carton or contents is damaged. Retain the carton and
packing material until all components associated with the instrument are operational.
2.2 ASSEMBLY
The ROX GT comes fully assembled with sensor installed. Please note that the gas
inlet and outlet connections are sealed to prevent exposure of the sensor to air.
Prolonged exposure of the sensor to air can cause extended start up time, reduction
of performance or damage to the sensor. Do not remove the sealing caps until all
associated sample handling components are installed and the instrument is
fully ready for installation.
The ROX GP requires that the sensor be installed after the analyzer has been
installed and gas connections made.
F
IGURE
Cell Block
2-1. ROX T
Meter Display Alarm Setting
Power Board
OP VIEW (COVER REMOVED
)
Switch
Signal Board
Power Entry Module
748375-C Rosemount Analytical August 2000
ROX GT/ROX GP Oxygen Analyzers
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