Teledyne operating instructions Model OT-2 System Maintenance

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Model OT-2 System

Maintenance 4

 

 

 

 

 

 

Maintenance

4.1Routine Maintenance

Aside from normal cleaning and checking for leaks at the gas connections, routine maintenance includes servicing the filter, the scrubber, installing replacement Micro-Fuel cells and recalibration. For recalibration, see section 3.3 Calibration.

4.2Cell Replacement

The Micro-Fuel Cell is a sealed electrochemical transducer with no electrolyte to change or electrodes to clean. When the cell reaches the end of its useful life, it is replaced. The spent fuel cell should be discarded according to local regulations.

The characteristics of the Micro-Fuel Cell are similar to those of a mercury battery in that both provide an almost constant output (when the sensor is exposed to a constant level of oxygen) throughout their useful life, and then fall off sharply towards zero at the end. Cell failure, in the Model OT-2 System, will probably be indicated by the inability to properly span calibrate the transmitter, or excessively long response time to changes in oxygen concen- tration.

To ensure availability, TAI recommends that a spare cell be purchased shortly after the instrument is placed in service, and each time the cell is replaced.

The spare cell should be carefully stored in a cool, and near constant temperature, area if possible.

NOTE: Do not disturb the integrity of the cell package until the cell is to actually be used. If the cell package is punctured

and has been exposed to atmospheric air over an ex- tended period, the sensor may not function properly.

Power must be removed from the OT-2 prior to removing or installing the sensor.

Teledyne Analytical Instruments

4-1

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Contents Model OT-2 Oxygen Transmitter System Copyright 1999 Teledyne Analytical Instruments Model OT-2 SystemTable of Contents Ground Model OT-2 System Introduction Introduction Model OT-2 System Front View Introduction Model OT-2 System Introduction Model OT-2 System Operational TheoryMicro-Fuel Cell Sensor Principles of Operation Operational Theory Model OT-2 SystemCross Section of a Micro-Fuel Cell not to scale Electrochemical Reactions Model OT-2 System Operational Theory Characteristic Input/Output Curve for a Micro-Fuel Cell Electronics and Signal Processing Sample Flow Description See Figure Piping Layout Operational Theory Model OT-2 System Model OT-2 System Operation InstallationMounting Details Operation Model OT-2 SystemGas Connections Operation Model OT-2 System Front View of Transmitter Calibration Operation Model OT-2 System Installing the Micro-Fuel CellSample System Component Locations Span Gas % F.S. x 4 + = Output in VDC 100 3 H2S Scrubber Testing the SystemOperation Model OT-2 System Model OT-2 System Maintenance Model OT-2 System Scrubber Replacement Maintenance Model OT-2 System Appendix Qty Part Number Description Section I Product Identification Section III Physical Hazards Section V Emergency and First Aid Procedures Appendix
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