Oldham Surveyor 4B - Page 22

18
Surveyor 4B
User Manual
Adjusting the ZERO
- Necessary when a cell is replaced
- At least twice a year
- Connect a voltmeter to the two terminal posts provided for that purpose (MF
and MES), as shown below:
Figure 9
- Be sure to be in pure atmosphere (without gas) (If not, inject air)
- Adjust the ZERO (0 mV) with the potentiometer, item 1.Figure 9.
Checking the sensitivity
- Necessary when a cell is replaced.
- At least twice a year.
- Prepare the calibration kit and secure the gas input pipe to the detector.
- Adjust the flow rate of the reference gas
6
to 60 l/h before injecting.
- Allow to stabilize for at least 10 seconds.
- Check that the alarm or alarms are triggered (as applicable
6
) and carry out
the following procedure.
6
La valeur du gaz étalon sera supérieure au moins au premier seuil d'alarme.
item 1
item 2
MV