4.2
4.2 Recommended calibration check periods
It is recommended that the calibration of gas sensor modules is checked at the periods
shown in Table 4.1 and recalibration performed if required.
Table 4.1 Recommended calibration periods
Gas sensor module Low calibration High calibration
Gfx sensor weekly monthly
Paramagnetic sensor weekly monthly
4.3 Setting low and high calibration tolerances
A limit may be placed on the amount by which a calibration operation may change the
stored calibration parameters. This limit is called the low or high calibration tolerance.
If the calibration tolerance limit is exceeded during auto calibration then the auto
calibration will be aborted and a fault will be indicated. If the calibration tolerance limit
is exceeded during manual calibration a warning will be given with an option to proceed.
See Table 4.2 for information on setting these tolerances. The calibration tolerance
values are expressed in terms of the full scale deflection (FSD) of the transducer (see
section 1.8).
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