14
4.3.2. FAULT alarms
The S4B is equipped with a fault alarm (visual alarm (item 2, Fig. 6), audio alarm and relay 1)
which is activated in the following cases:
•
One or more wires of the telemetry line interrupted,
•
One or more wires of the telemetry line short-circuited or with excessive power consumption.
NB: The ALARM LEDs may also be activated depending on the circumstances of the
interruption or the short circuit.
4.4. Adjustments
Caution: The operations and adjustments described in this chapter must be performed by authorized
personnel only as they can affect the appliance's reliability in detection.
4.4.1. 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 (item 1, Fig. 7) 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.
Item 1
FIGURE 7
Item 3
Item 4
Item 2
Item 5
