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4.2
Generator Cell Replacement
The generator cell has an approximate life time of 1 year or 2,500 tests. After this time it
needs replacement. It also needs replacement, if a gas detector known to be good does not
respond to a gas test.
4.2.1
H
2
S and HCN Generator (see Picture 1)
1 Loosen the 4 screws on the backside of the instrument and separate the two halves. (Use
caution as the LED’s are attached to the top case)
2 Remove the battery.
3 Unsolder the 2 wires from the old generator cell and remove the tubing from the pump.
4 Unsrew the 4 screws securing the PCB and remove the PCB.
5 Unscrew the 3 screws of the generator cell, which secure it to the bottom case, and
remove the old generator cell. Insert the new generator cell and tighten the 3 screws.
6 Reinsert the PCB and tighten the screws. Please make sure that the switch pin has not
moved and that it easily activates the switch on the PCB.
7 Reconnect the battery.
8 If required, adjust the generator current to the following specifications:
- Connect current meter to PCB pin 4 (center pin) and pin 7 (left pin).
- Press switch S101 and adjust generator current with potentiometer R114 to the
applicable current:
H
2
S = 3,5 mA; HCN 100 ppm = 0,7 mA; HCN 20 ppm = 0,35 mA
9 Solder the wires of the generator cell to the PCB pins:
- black cable to pin 4 (center pin)
- yellow cable to pin 7 (left pin)
Connect the tubing to the pump port marked “out”.
10 Close the housing of the generator and tighten the 4 screws in the back.
Note:
) Whenever you have done maintenance work on a gas generator, test the function with a
working gas detector. The detector should give an alarm within 10 seconds.
11