Adjusting the "gas alarm" thresholds
Using a "reference gas kit" (gas cylinder + pressure regulator, etc.), inject the
reference gas with a content level higher than the first threshold desired. (For
example, threshold 1 will be 20% LEL, so a minimum of 25% LEL should be
injected).
Adjust the alarm potentiometer (rep 1, Figure 8) to trigger the first threshold
(AL1): the red LED (AL1) flashes (for 7 seconds) and then remains on in
steady mode, trip the corresponding alarm relay.
If you stop at this point, alarm 2 will be set to twice the level of alarm 1.
If you continue until alarm 2 is triggered: alarm 1 will be set to half the level of
alarm 2.
If you wish to lock the alarm relays (inhibiting the relays) during these alarm
threshold adjustments: set the maintenance switch to the high position (item
2, Figure 8).
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