7. After the measurement has stabilized (approx. 2 minutes), read the value on
the multimeter "B".
A measurement of 0.4 V corresponds to 4 mA, i.e. 0% gas.
Note: for the oxygen detector, inject pure nitrogen instead of air.
8. If a different value is displayed, adjust the "0" control ("C") in order to correct
the value until 0.4 V is exactly displayed.
9. Close the valve "F" on the cylinder. Remove calibration ribbon cable "A",
calibration pipe "D", and close the detector again if no sensitivity control is
necessary.
10. Reset any alarm signals on the controller.
Sensitivity adjustment (OLCT 100)
This procedure enables the measurement to be adjusted corresponding to x%
gas. Proceed as follows
1. Inhibit any alarm signals on the controller.
2. Insert the blue and green plugs on the measurement lead into the + and -
multimeter sockets, respectively (Figure 14Figure 14: Zeroing and Sensitivity
adjustment (OLCT 100), "H").
3. Insert the measurement lead into connector "A".
4. Place the calibration cup on the detector head ("D").
5. Connect the calibration cup to the calibration gas cylinder "G" by using a
flexible hose "E".
A stainless steel pressure gauge and Teflon tube must be used for toxic
gases and Freons.
Note: for an oxygen detector, use a cylinder of pure air or roughly 19%
oxygen.
6. Open the valve "F" on the calibration gas cylinder (flow rate 30 to 60 litres/h).
7. Once the measurement has stabilized (approx. 2 minutes), read the value on
the multimeter.
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