Dräger MQG 02 0 Series - 6.7.2 Performing a fresh air calibration

Technical manual | X-am
®
2800 / X-am
®
5800 27
Maintenance
X-am 5800: An active H2 added signal will be automatically deactivated
temporarily for the duration of a manual calibration, a PC calibration or an automatic
bump test.
6.7.2 Performing a fresh air calibration
Observe the following instructions for fresh air calibration:
● To improve accuracy, a fresh air calibration must be carried out if a zero
deviation exists.
● For the fresh air calibration, the display on the DrägerSensor XXS O
2 and XXS
O2 PR is set to 20.9 Vol%.
The fresh air calibration is not supported by the CO2 channel of the infrared
sensor and XXS O3. A zero calibration of these sensors can be undertaken by
performing a single-gas calibration with N2 or using the Dräger CC-Vision PC
software. A suitable zero gas is required here, one that is free from carbon dioxide
and ozone (e.g. N2).
Prerequisites
– The fresh air calibration can only be carried out if at least one sensor supports
fresh air calibration.
– The fresh air must be free of measured or interfering gases.
– The gas detector is switched on and warm-up phases 1 and 2 are complete.
To carry out a fresh air calibration:
1. Switch on the gas detector.
2. Call up fresh air calibration (depending on configuration):
Via the Quick menu:
● Press 3x in measuring mode.
● Select and confirm fresh air calibration .
Via the menu:
a. Press for approx. 4 s in measuring mode.
b. Enter and confirm the password.
c. Select and confirm fresh air calibration .
 All measurement channels involved in the fresh air calibration flash.
3. Press to start fresh air calibration manually.
 All measurement channels involved in the fresh air calibration flash.
4. If necessary, press to override the stability check. In this case, a calibration
takes place immediately.
Dräger recommends using the automatic stability control (wait until the gas
detector has independently carried out the calibration).
 The new measured value is displayed for control purposes.
The result is displayed as follows:
OK fresh air calibration successful.
fresh air calibration failed.
OK
OK