Teledyne 3190 manual Operational Theory Model, Anatomy of a Micro-Fuel Cell

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2 Operational Theory

Model 3190

 

 

 

 

 

 

 

 

 

stored within the cell, whereas in the Micro-Fuel Cell, one of the reactants (oxygen) comes from outside the device as a constituent of the sample gas being analyzed. The Micro-Fuel Cell is therefore a hybrid between a battery and a true fuel cell. (All of the reactants are stored externally in a true fuel cell.)

2.2.2 Anatomy of a Micro-Fuel Cell

The Micro-Fuel Cell is a cylinder only 1¼ inches in diameter and 1 inch thick. It is made of extremely inert plastic, which can be placed confidently in practically any environment or sample stream. It is effec- tively sealed, although one end is permeable to oxygen in the sample gas. The other end of the cell is a contact plate consisting of two concentric foil rings. The rings mate with spring-loaded contacts in the sensor block assembly and provide the electrical connection to the rest of the analyzer. Figure 2-1 illustrates the external features.

Figure 2-1: Micro-Fuel Cell

Refer to Figure 2-2, Cross Section of a Micro-Fuel Cell, which illus- trates the following internal description.

Figure 2-2. Cross Section of a Micro-Fuel Cell (simplified)

2-2

Teledyne Analytical Instruments

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Contents Model 3190 Series Teledyne Analytical InstrumentsCopyright 1999 Teledyne Analytical Instruments Specific Model Information Contents Maintenance AppendixTeledyne Analytical Instruments Overview Main Features of the AnalyzerIntroduction Trace Oxygen Analyzer IntroductionFront Panel Description Introduction ModelRear Panel Description Up ArrowAnalog Outputs Rear Panel AC and DC versionsRS-232 Port Introduction Model Teledyne Analytical Instruments Micro-Fuel Cell Sensor Operational TheoryIntroduction Trace Oxygen Analyzer Operational TheoryOperational Theory Model Anatomy of a Micro-Fuel CellElectrochemical Reactions + 2H 2O + 4e → 4OHCalibration Characteristics Effect of PressureGeneral Signal ProcessingElectronics Block Diagram of the Signal Processing Electronics Unpacking the Analyzer InstallationTrace Oxygen Analyzer Installation External Probe Installation Installation ModelControl Unit Installation Location and MountingInstalling the Micro-Fuel Cell / Cell Block Orientation Electrical ConnectionsRear Panel Electrical Connectors for AC and DC Units Trace Oxygen Analyzer Installation Parameter Setting HI AlarmLO Alarm Sensor FailInstallation Checklist Gas ConnectionsInstallation Model Teledyne Analytical Instruments Trace Oxygen Analyzer Operation Using the Function and Data EntryOperation Operation Model Setting the Analysis RangesButtons HI Alarm Setting the Alarm SetpointsSettle Mode Trace Oxygen Analyzer Operation HI RangeSelecting a Fixed Range or Autoranging LO AlarmSensor Fail Alarm CalibrationProcedure Displaying Percent & PPM on the LED DisplaySetL mode in the LED display AC Powered Units MaintenanceTrace Oxygen Analyzer Maintenance Replacing the FuseDC Powered Units Sensor Installation or ReplacementMaintenance Model When to Replace a SensorDisconnect the Power Source at the Control Unit Removing the Micro-Fuel CellInstalling a Micro-Fuel Cell Exploded View of MFC and Cell BlockDisconnect the Power Source from the Control Unit Cell Warranty ConditionsMaintenance Model Teledyne Analytical Instruments Appendix Specifications Trace Oxygen Analyzer AppendixSpare Parts List Appendix ModelDrawing List MiscellaneousAppendix Model Teledyne Analytical Instruments