Teledyne Trace Oxygen Analyzer operating instructions Operational Theory Model 3000TA-XL-EU

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2 Operational Theory		Model 3000TA-XL-EU

which is physically located in the cell block. The thermistor is a temperature dependent resistor that changes the gain of the amplifier in proportion to the temperature changes in the block. This change is inversely proportional to the change in the cell output. The result is a signal that is temperature inde- pendent within a specified tolerance. The output from the second stage amplifier is sent to an 18 bit analog to digital converter controlled by the microprocessor.

The digital concentration signal along with input from the control panel is processed by the microprocessor, and appropriate control signals are directed to the display, alarms and communications port. The same digital information is also sent to a 12 bit digital to analog converter that produces the 4-20 mA dc and the 0-1 V dc analog concentration signal outputs, and the analog range ID outputs.

Signals from the power supply are also monitored, and through the microprocessor, the system failure alarm is activated if a malfunction is detected.

2-10	Teledyne Analytical Instruments

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Contents Trace Oxygen Analyzer Teledyne Analytical InstrumentsModel 3000TA-XL-EU Copyright 1999 Teledyne Analytical InstrumentsIii Trace Oxygen Analyzer Specific Model InformationGround Protective Earth Teledyne Analytical InstrumentsTrace Oxygen Analyzer Table of Contents Introduction InstallationOperational Theory OperationMaintenance AppendixVii Trace Oxygen Analyzer AppendixCombustible GAS Usage Warning ViiiMain Features of the Analyzer OverviewTypical Applications Trace Oxygen Analyzer IntroductionModel Designations Introduction Model 3000TA-XL-EUFront Panel Operator Interface Model 3000TA-XL Front PanelIntroduction Model 3000TA-XL-EU Rear Panel Equipment Interface Analog OutputsRS-232 Port Remote ProbeNetwork I/O Operational Theory Introduction Micro-Fuel Cell SensorTrace Oxygen Analyzer Operational Theory Principles of OperationOperational Theory Model 3000TA-XL-EU Anatomy of a Micro-Fuel CellElectrochemical Reactions + 2H 2O + 4e → 4OHCalibration Characteristics Effect of PressureCharacteristic Input/Output Curve for a Micro-Fuel Cell Sample SystemTOP Flow Diagram-Sample Under Pressure Standard Model Electronics and Signal Processing Electronic Component Location Inside the Model 3000TA-XLBlock Diagram of the Model 3000TA-XL Electronics Operational Theory Model 3000TA-XL-EU Trace Oxygen Analyzer Installation Unpacking the AnalyzerMounting the Analyzer Installation Model 3000TA-XL-EU Rear Panel ConnectionsGas Connections Rear Panel of the Model 3000TA-XLPrimaryInputPower 2.2 50-Pin Equipment Interface ConnectorElectrical Connections Equipment Interface Connector Pin Arrangement Pin FunctionPin Contact Remote Calibration Connections Range ID Relay Connections 2.3 RS-232 Port FET Series ResistanceCommand Description Parameter SettingInstalling the Micro-Fuel Cell Testing the SystemRemoving the Micro-Fuel Cell Trace Oxygen Analyzer Operation Auto Ranging onUsing the Data Entry and Function Buttons Operation Model 3000TA-XL-EUSystem Function Analyze SystemOperation Model 3000TA-XL-EU Setting up an Auto-Cal Password Protection Entering the Password Installing or Changing the Password System Self-Diagnostic Test LogoutVersion Screen Calibration of the Analyzer Span Gas CalibrationAir Calibration Zero CalAuto Mode Zeroing Manual Mode ZeroingCell Failure Auto Mode Spanning Operation Model 3000TA-XL-EU Span CalManual Mode Spanning Switching of Sample Streams Span FailureAlarms Function Special Notes on Hydrogen Gas StreamAL-1 AL-2 Choose Alarm Range Function Setting the Analog Output Ranges Fixed Range AnalysisSignal Output Analyze FunctionRange Voltage Current mA MEDRoutine Maintenance Cell ReplacementTrace Oxygen Analyzer Maintenance Storing and Handling Replacement CellsMaintenance Model 3000TA-XL-EU When to Replace a Cell Removing the Micro-Fuel CellRemoving the Micro-Fuel Cell Warranty Fuse Replacement Removing Fuse Block from HousingSystem Self Diagnostic Test Maintenance Model 3000TA-XL-EUMajor Internal Components Cleaning Rear-Panel ScrewsTroubleshooting SolutionSpecifications Operating Temperature 5-35 C AppendixRecommended 2-Year Spare Parts List Drawing List 19-inch Relay Rack Panel Mount3000XL Series Analyzers Conversions Page Material Safety Data Sheet Section IV Fire and Explosion Hazard Data Protective measures during cell replacement ExposureSection Viii Control Measures Read completely before beginning the procedure

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