Oldham SV 4B - Adjusting the ZERO; Checking the Sensitivity

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4.4.3. 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.
Be sure to be in pure atmosphere (without gas) (If not, inject air)
- Adjust the ZERO (0 mV) with the potentiometer, item 1.Figure8
4.4.4. 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
(1) 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
The value of the reference gas must be higher than at least the first alarm threshold.
FIGURE 8
MV
Rep 2
Rep 1
Rep 3