Instruction 0019-9322
MGC 100/200
3.7 Zeroing the N
2
O Sensor
(MGC 100)
Zero the N
2
O sensor of the MGC 100 as follows:
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 button and allow the pump to run to purge
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 sensor. If this condition is not
ensured, incorrect gas readings will occur.
3. Press and hold down the
f
2
button until the following displays appear.
Note that the instrument beeps 5 times when it enters the User Cal
mode, and then emits a steady tone indicating that the
f
2
button can
now be released.
An operator can abort this procedure by momentarily pressing the
f
2
button.
4. To zero the sensor in ambient air, momentarily press the
f
1
button.
The instrument will display “Air Cal OK” for 2 seconds if the sensor
was successfully zeroed and then reads 0.0%.
If the procedure was unsuccessful, the message
will be displayed. If this happens, retry this procedure. If the proce-
dure is still unsuccessful, then return the instrument to a Bacharach
Service Center for evaluation.
User Cal
f1-> Air
f3-> Gas
AirCal
N2O %
OK
0.0
AirCal
Failed
11
Содержание MGC200
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