The cover of the detector remains closed, with any adjustments being
carried out at the central measuring unit.
For an explosimeter, it is recommended that the detector should be
calibrated by using the gas to be detected. If the user would like to
calibrate the detector with a gas other than that detected and
programmed in the factory, reference should be made to the table on
page 30 by using the recommended gas and corresponding coefficient.
Zeroing
Proceed as follows :
034
Figure 13 : Zeroing (OLC 100)
1. Inhibit any alarm signals on the controller.
2. Place the calibration cup onto the detector head (Figure 13, "A").
3. Connect the calibrator cup to the pure air cylinder "D" using a flexible hose "B".
4. Open the valve on the zero air cylinder (flow rate 30 to 60 litres/h) "C".
5. After the measurement has stabilised (approx. 2 minutes), read the dis play of
the central measuring unit.
A displayed figure of "0.0" corresponds to 0% gas.
6. If a different value is displayed, adjust the "0" on the measuring unit to correct
the value until a reading of exactly 0.0% is obtained.
7. Close the valve "C" on the cylinder. Remove the calibration cup "A" if no
sensitivity control is necessary.
8. Reset any alarm signals on the controller.
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