l the gas concentration drops below 50% of the expected gas level during the 2-
minute span.
If gas is applied to a sensor and the detector fails to span the sensor, perform the
following:
l Repeat the calibration using a new gas cylinder.
l Repeat the calibration using a new 0.5 l/min regulator or a new demand flow
regulator.
l If the sensor fails the span a second time, replace the sensor. Refer to See
"Replacing a Sensor or Sensor Filter" on page91 for more information..
If a sensor(s) fails any step of the calibration, the following screen displays.
Note: If calibration is unsuccessful for a sensor(s), the calibration due date cannot be
set for the failed sensor(s).
BW MaxXT II 77 User Manual
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