Teledyne BDS-3960 operating instructions Cross Section of the BDS Oxygen Sensor

Page 20

Operational Theory

BDS 3960

 

 

 

 

 

 

The main advantage of the BDS technology lies in the unique second potentiostat. It is designed to remove dissolved oxygen and other impurities in the electrolyte. It eliminates the internal background current which previously limited the detection process.

The second potentiostat is located adjacent to the sensing electrode. It uses a novel material, Reticulated Vitreous Carbon (RVC) and precise control of the potential to remove the dissolved oxygen and impurities in the electrolyte efficiently. As the result, the BDS sensor achieves an outstanding feature of absolute zero output in the absence of oxygen.

Figure 2.1: Cross Section of the BDS Oxygen Sensor

Figure 2.1 shows the schematic of a BDS oxygen sensor. The sample gas enters the sensor through the gas inlet port and exits at the gas outlet. A portion of oxygen in the sample gas diffuses through the diffusion barrier to be reduced at the sensing electrode to form OH- in the electrolyte. OH- can move freely through the porous 2nd working electrode. At the counter electrode, OH- is oxidized back to oxygen.

Teledyne Analytical Instruments

20

Image 20
Contents Oxygen Analyzer Teledyne Analytical InstrumentsBDS Copyright 2002 Teledyne Analytical InstrumentsSpecific Model Information IiiSafety Messages Oxygen Analyzer Table of Contents Operation ViiMaintenance AppendixIndex Teledyne Analytical Instruments ViiiList of Figures BDS-3960 Front PanelVacuum Degassing for the BDS Oxygen Sensor List of Tables Combustible GAS Usage XiiMain Features of the Analyzer IntroductionOverview Typical ApplicationsFront Panel Operator Interface BDS-3960 Front Panel Rear Panel Equipment Interface Analog OutputsRemote Probe Range ID ContactsModel BDS 3960 Rear Panel Operational Theory IntroductionBDS Sensor Principles of OperationOxygen Analyzer Operational Theory Cross Section of the BDS Oxygen Sensor Gas Flow Rate BDS sensor output at different gas flow rateGas Pressure Temperature effectRecovery from High Level Oxygen Exposure Background Gas Compatibility Typical Purge-down Curve After Air SaturationMaintenance StabilitySample System Electronics and Signal Processing Flow DiagramOxygen Analyzer Operational Theory BDS 3960 Electronics Block Diagram Page Mounting the Analyzer InstallationUnpacking the Analyzer Oxygen Analyzer Installation Model BDS 3960 Front PanelRear Panel Connections Gas ConnectionsElectrical Connections Equipment Interface Connector Pin Arrangement Threshold Alarm Pin FunctionSystem Alarm Pin ContactCal Contact Installation Electrolyte Refill of BDS Sensor Testing the System Adding Electrolyte to the BDS SensorPowering Up the System Operation Auto Ranging onOxygen Analyzer Maintenance Analyzer applicationSystem Screen Communication Information and Calibration ParametersSetting Software Parameters Filter, Gas Factor, Tmp. Coeff Gas Factor Parameter Selection BoxTemperature Coefficient Parameter Default Values Calibration of the Analyzer Zero CalSpan Cal Alarms Function Maintenance Setting the Analog Output Ranges Range FunctionRange Options List Box Signal Output Fixed Range AnalysisSwitching The Program Back To Front Oxygen Analyzer Maintenance Maintenance Routine Maintenance Adding Water to the BDS SensorFuse Replacement Adding Water into the BDS sensorBattery Backup Replacement Removing Fuse Block from HousingReinstalling Application software to PPC Click startProgramsexplorer Click showMy DeviceCleaning TroubleshootingSymptoms Possible causes and Solutions Major Internal ComponentsCauses and solution keys Vacuum Degassing for the BDS Oxygen Sensor Oxygen Analyzer Maintenance Teledyne Analytical Instruments Specifications AppendixOperating Temperature 5-40 C Oxygen Analyzer AppendixRecommended 2-Year Spare Parts List Qty Part Number DescriptionDrawing List 19-inch Relay Rack Panel MountApplication notes Section II Physical and Chemical Data Material Safety Data SheetSection I Product Identification Section III -Physical Hazards Section IV Health Hazard DataSection VI Handling Information Alarms IndexOxygen Analyzer Index MsdsZero