4 Calibration Troubleshooting
Sometimes when you get to step 6 of the calibration procedure above,
the calibration gas reads something quite different from what you
expect. If so, the reason is more likely to be due to a problem with the
calibration gas than the analyzer. We recommend that you first
perform a sanity check as follows:
1. Turn on the Sample/Bypass valve to the “OFF”position.
2. Disconnect the calibration gas, and instead connect a low level gas
such as nitrogen or maybe your sample gas.
3. Allow the low level gas to flow at about 2SCFH while you do the
following QUICKLY:
4. Open the cell cap.
5. Blow a little air under the cell in its compartment while waving
your hand near the sensor to bring fresh air to it.
6. Observe the reading. It should shoot up to about 20.9%.
7. If it gets reasonably close, calibrate it to 20.9% quickly. You want
to take less than a minute to do this whole thing.
8. Turn the Sample/Bypass valve to the “ON” position, and replace
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