5 - Operating instructions
15
Adjusting the "gas alarm" thresholds
Using a "reference gas kit" (gas cy 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).
Figure 8
Maintenance
(
↑ up)
Normal
item 3
item 1
item 2
item 4
MV
item 5
Summary of Contents for Surveyor 4B
Page 1: ...User Manual Surveyor 4B R f rence NPS4BGB R vision E 0 The Fixed Gas Detection Experts...
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