WARNING
Calibration cylinders that are used with a demand flow regulator must meet the following
maximum inlet pressure specifications:
l Disposable cylinders 0-1000 psig/70 bar
l Refillable cylinders 0-3000 psig/70 bar
Honeywell recommends using premium grade calibration gases and cylinders that are certified
to National Standards.
The calibration gases must meet the accuracy of the detector.
Diagnostics Protection
The detector tests the ambient air (auto-zero) and the test gas that is applied (auto span) to
ensure it meets expected values. Auto-zero sets the zero-gas level of the sensor. If the target gas
is present, the zero level will be incorrect.
If excessive target gas is present, the sensor(s) will fail and an error message displays.
In auto span, an error message displays if the target gas does not meet the expected values.
Sensor(s) that fail to span retain the previous span value and do not continue the
calibration process.
BW MaxXT II 71 User Manual
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