ZERO CALIBRATION
GasZero: GasZero should not be used very often - only if for some reason the
baseline zero value of the sensor value is flickering or drifting and does not
maintain a zero value. For gases such as oxygen however, exposing the sensor
to pure ZERO nitrogen gas is important to maintain accuracy and for good
measure this should be undertaken periodically between 6-12 months (i.e. every
calibration cycle). For most gases (other than O2), if the sensor continues to
read above zero, cross sensitivity to vapors or other gases may be possible.
Ensure a fresh environment to diagnose this situation, particularly after high
concentration exposure.
Select GasZero from the Main Menu Screen. Select Gas to ZERO. Expose to
ZERO air for 1 min. Use fresh air for H2S, CO and %LEL. For O2 expose to pure
N2. Maintain a flow of about 0.5L/min to deliver the gas to the detector (i.e. via
the inlet). Then press SAVE button to confirm the zero value. When complete,
“SAVE SUCCESS” is displayed.
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