Honeywell MultiRAE Series User Manual page 137

After a timer countdown, the span calibration is done. The LCD will display whether the
calibration was successful and the reading for that calibration gas.
Note: If the sensor calibration fails, try again. If calibration fails repeatedly, turn off the
instrument and then replace the sensor.
WARNING: Do not replace sensors in hazardous locations.
Honeywell MultiRAE Series™ 132 User Manual