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The most likely reason for this message is an operational error in the
calibration procedure rather than a faulty sensor.
If this occurs during zeroing repeat the procedure and check that
there is no nitric oxide, or nitrogen dioxide contamination, and that
the water trap has been removed.
If the calibration error message appears during sensitivity
adjustment, repeat the calibration procedure and check:
1. Is calibration gas within its warranty period?
2. Has correct gas concentration been entered?
3. Have the correct connections been made with no leaks?
4. Is there sufficient calibration gas flow?
5. Is there any reaction between nitric oxide and the
connectors used?
6. Are there any contaminants between nitric oxide supply and
sensor?
Nitric oxide is a very reactive gas and it is difficult to maintain a
stable concentration within a cylinder. It is therefore advisable to
have some independent means of checking the calibration gas used.
After calibration is complete, selecting option “3 Exit” will return the
display to the main menu screen.
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