42 Technical manual | X-am® 3500/8000
Maintenance
9. Remove the calibration adapter.
If there was an error during the bump test:
1. An error is displayed for the measuring channel.
2. Repeat the bump test.
3. If necessary, replace the sensor.
6.4 Calibrate the gas detector
WARNING
Incorrect measured values!
An incorrect calibration may prevent alarms from triggering, or alarms may trigger
late.
► Do not close the outlet of the calibration adapter / exhaust gas hose.
► Always carry out the fresh air / zero adjustment before the span calibration.
NOTICE
Damage to the sensors!
When using the exhaust gas hose, the sensors may be damaged in the case of
direct suction on the exhaust gas hose.
► If necessary, lead the exhaust gas hose (max. length 2 m) to an exhaust of
outside.
Adjustment may not be possible due to instrument and channel errors.
6.4.1 Carrying out a fresh air calibration
To improve accuracy, a fresh air calibration must be carried out if there is a zero
deviation.
Observe the following notices for the calibration:
● For calibrating the XXS O
2 with fresh air, set the display to 20.9 Vol%.
● There may be deviations of >10 % of the measured value for temperatures
below –20 °C if the respective sensor is calibrated at room temperature. Dräger
recommends calibrating the sensor at the planned operating temperature if the
measurement is to be carried out at very low temperatures. This allows a
possible deviation to be reduced.
X-am 8000:
● An activated H
2 added signal is automatically deactivated duration of a bump
test or a calibration.
● During fresh air calibrations, the zero-point of all sensors (except the
DrägerSensors XXS O
2, DUAL IR CO2 and IR CO2, XXS O3) is set to 0.
● The DrägerSensors DUAL IR CO
2, IR CO2 and XXS O3 must be calibrated with
a suitable gas which is free of carbon dioxide / ozone (e.g. N
2).
● The DrägerSensor PID LC ppb can be calibrated with the zero gasses nitrogen
or synthetic air.
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