IV. OPERATING INSTRUCTIONS
4.1. Switching on
It is assumed that all the necessary connections have been made and that the whole installation
complies with the standards currently in force.
As soon as the SV 4B is supplied with power, it is ready to use and the GREEN light-emitting diode
lights up (item 1, Fig. 6).
Relay 1 is operated ("positive safety" position).
4.2. Switching off
The SV 4B is switched off by cutting off the power supply on an electrical equipment cabinet.
4.3. Alarms
4.3.1. GAS alarm
The SV 4B has two adjustable GAS alarm thresholds but the second threshold (AL 2) must be twice
the first (AL 1).
Therefore, the red light-emitting diodes "AL1" and "AL2" (item 3, Fig. 6) come on as soon as the
alarm thresholds are exceeded (time delay of 7 seconds): LED flashing. The audio alarm (buzzer) is
activated and the corresponding relays are tripped.
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