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bench testing
When the fault has been resolved, the probe should be bench-tested before fitting
it back into the flue.
1. Allow the probe to operate in air for about 20 minutes in order to achieve tem-
perature stability.
2. Periodically check the cell EMF reading after the initial stabilizing time has
expired.
3. The reading should settle at the cell constant of typically 0V ±2mV for a new cell.
4. When the cell attains its constant (typically 1 hour), apply a zero calibration gas
and check the cell EMF. If necessary, carry out a full calibration.
The cell can take up to three hours to fully settle.
NOTE
If the cell responds correctly to the calibration gas, the probe can be refitted into
the flue.
Maintenance and Troubleshooting
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5-7
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