Zeroing The Co2 & Co Sensors (Mgc 200) - Bacharach MGC 100 Operation & Maintenance Manual

3.8 Zeroing the CO
Zero both the CO and CO sensors of the MGC 200 as follows:
2
1. Turn ON the instrument and allow it to warm up per Section 2.2.
2. With the instrument sampling fresh air, turn ON the pump by mo-
mentarily pressing the
out any resident gas. Then turn OFF the pump once a steady reading
is obtained (approx. 60 seconds).
WARNING! It is essential that the instrument is in fresh air
before attempting to zero the sensors. If this condition is not
ensured, incorrect gas readings will occur.
3. Press and hold down the f
played. Note that battery status is fi rst displayed for approximately
2 seconds.
Air Cal
4. Keep the f button depressed until the display shows:
2
Air Cal
OK
If the procedure was unsuccessful, or if the f
turely, then the message
Air Cal
Failed
will be displayed. If this happens, retry the Air Calibration pro cedure,
ensuring that the instrument is only exposed to fresh air. If the proce-
dure is still unsuccessful, then the instrument must be returned to a
Bacharach Service Center for evaluation.
12
MGC 100/200
& CO Sensors
2
button and allow the pump to run to purge
button until the "Air Cal" screen is dis-
2
button released prema-
2
(MGC 200)
Instruction 0019-9322