the cell cap.
9. Flow nitrogen or sample gas for long enough for the reading to
come down to a low level (ideally less than 1ppm).
10. Turn the Sample/Bypass valve to the “OFF” position.
If it only comes up to a small number, or if you can’t calibrate it up to
20.9%, verify that you have the Sample/Bypass valve in the “OFF”
position. If so, you will need to replace the sensor.
If it did easily calibrate to 20.9%, then the analyzer is now
approximately calibrated. Go through the calibration procedure above
until you get to step 6.
If the value the analyzer now reads is within about 15% of what it says
on the calibration bottle, go ahead and calibrate.
If it is further away than this, particularly if it is a lot higher, you have
more oxygen in you calibration gas for some reason. You will need to
troubleshoot the span gas. Check for leaks, bleed the regulator, and if
it still does not read correctly, get a new bottle of gas.
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