Teledyne 3000TA-XL-EU Operational Theory Introduction, Micro-Fuel Cell Sensor

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Trace Oxygen Analyzer

Operational Theory 2

 

 

 

 

 

 

 

 

 

Operational Theory

2.1Introduction

The analyzer is composed of three subsystems:

1.Micro-Fuel Cell Sensor

2.Sample System

3.Electronic Signal Processing, Display and Control

The sample system is designed to accept the sample gas and transport it through the analyzer without contaminating or altering the sample prior to analysis. The Micro-Fuel Cell is an electrochemical galvanic device that translates the amount of oxygen present in the sample into an electrical current. The electronic signal processing, display and control subsystem simplifies operation of the analyzer and accurately processes the sampled data. The microprocessor controls all signal processing, input/output and display functions for the analyzer.

2.2Micro-Fuel Cell Sensor

2.2.1 Principles of Operation

The oxygen sensor used in the Model 3000TA-XL series is a Micro- Fuel Cell, Model B-2CXL designed and manufactured by Analytical Instru- ments. It is a sealed plastic disposable electrochemical transducer.

The active components of the Micro-Fuel Cell are a cathode, an anode, and the aqueous KOH electrolyte in which they are immersed. The cell converts the energy from a chemical reaction into an electrical current in an external electrical circuit. Its action is similar to that of a battery.

There is, however, an important difference in the operation of a battery as compared to the Micro-Fuel Cell: In the battery, all reactants are stored within the cell, whereas in the Micro-Fuel Cell, one of the reactants (oxygen)

Teledyne Analytical Instruments

2-1

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Contents Teledyne Analytical Instruments Trace Oxygen AnalyzerCopyright 1999 Teledyne Analytical Instruments Model 3000TA-XL-EUTrace Oxygen Analyzer Specific Model Information IiiProtective Earth Teledyne Analytical Instruments GroundOperation Trace Oxygen Analyzer Table of Contents IntroductionInstallation Operational TheoryAppendix MaintenanceTrace Oxygen Analyzer Appendix ViiViii Combustible GAS Usage WarningTrace Oxygen Analyzer Introduction Main Features of the AnalyzerOverview Typical ApplicationsIntroduction Model 3000TA-XL-EU Model DesignationsModel 3000TA-XL Front Panel Front Panel Operator InterfaceIntroduction Model 3000TA-XL-EU Analog Outputs Rear Panel Equipment InterfaceRS-232 Port Remote ProbeNetwork I/O Principles of Operation Operational Theory IntroductionMicro-Fuel Cell Sensor Trace Oxygen Analyzer Operational TheoryAnatomy of a Micro-Fuel Cell Operational Theory Model 3000TA-XL-EU+ 2H 2O + 4e → 4OH Electrochemical ReactionsEffect of Pressure Calibration CharacteristicsSample System Characteristic Input/Output Curve for a Micro-Fuel CellTOP Flow Diagram-Sample Under Pressure Standard Model Electronic Component Location Inside the Model 3000TA-XL Electronics and Signal ProcessingBlock Diagram of the Model 3000TA-XL Electronics Operational Theory Model 3000TA-XL-EU Trace Oxygen Analyzer Installation Unpacking the AnalyzerMounting the Analyzer Rear Panel Connections Installation Model 3000TA-XL-EURear Panel of the Model 3000TA-XL Gas ConnectionsPrimaryInputPower 2.2 50-Pin Equipment Interface ConnectorElectrical Connections Pin Function Equipment Interface Connector Pin ArrangementPin Contact Remote Calibration Connections Range ID Relay Connections FET Series Resistance 2.3 RS-232 PortParameter Setting Command DescriptionTesting the System Installing the Micro-Fuel CellRemoving the Micro-Fuel Cell Auto Ranging on Trace Oxygen Analyzer OperationOperation Model 3000TA-XL-EU Using the Data Entry and Function ButtonsAnalyze System System FunctionOperation Model 3000TA-XL-EU Setting up an Auto-Cal Password Protection Entering the Password Installing or Changing the Password Logout System Self-Diagnostic TestVersion Screen Zero Cal Calibration of the AnalyzerSpan Gas Calibration Air CalibrationManual Mode Zeroing Auto Mode ZeroingCell Failure Operation Model 3000TA-XL-EU Span Cal Auto Mode SpanningManual Mode Spanning Span Failure Switching of Sample StreamsSpecial Notes on Hydrogen Gas Stream Alarms FunctionAL-1 AL-2 Choose Alarm Range Function Fixed Range Analysis Setting the Analog Output RangesAnalyze Function Signal OutputMED Range Voltage Current mAStoring and Handling Replacement Cells Routine MaintenanceCell Replacement Trace Oxygen Analyzer MaintenanceRemoving the Micro-Fuel Cell Maintenance Model 3000TA-XL-EU When to Replace a CellRemoving the Micro-Fuel Cell Warranty Removing Fuse Block from Housing Fuse ReplacementSystem Self Diagnostic Test Maintenance Model 3000TA-XL-EUMajor Internal Components Rear-Panel Screws CleaningSolution TroubleshootingSpecifications Appendix Operating Temperature 5-35 CRecommended 2-Year Spare Parts List 19-inch Relay Rack Panel Mount Drawing List3000XL Series Analyzers Conversions Page Material Safety Data Sheet Section IV Fire and Explosion Hazard Data Exposure Protective measures during cell replacementSection Viii Control Measures Read completely before beginning the procedure
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