5.9.1 XCell Catalytic Bead Failsafe
Catalytic bead sensors require the presence of oxygen in order to sense combustible gas. In the event of very large
combustible gas leaks that exceed 100 % LEL, enough oxygen can be displaced so that the sensor's response to gas is no
longer proportional to the calibration profile. The XCell catalytic bead has a locking fail safe mechanism that prevents the false
reporting of a safe condition while the % LEL concentration is still above 100 % LEL. When the gas concentration exceeds 100
% LEL, the sensor will go into LOC over range.
To clear the LOC over rage, the user needs to acknowledge and calibrate the sensor. To acknowledge LOC over range, press
the EZ touch button or apply magnet to the GMI logo area until "Reset" is displayed and then release. This will allow a
recalibration of the sensor to clear the LOC condition.
WARNING!
Ensure that the area has been cleared of gas before acknowledging the LOC Over Range and recalibrating the sensor.
Failure to follow this warning can result in serious personal injury or death.
5.9.2 Calibration Confirmation
The S5000 Series Monitor records the date of the last successful calibration. This date can then be displayed via the Status
Menu.
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US 5 Calibration
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