10
Caution: If you add a detector to an existing installation, the link between terminals 1 and 4 must be
broken on each detector.
3.4. External components
Surveyor 4B is equipped with the following two relays.
•
Relay 1 (REL 1), which is in "positive safety" mode, corresponds to the first gas alarm threshold
and to the "FAULT" alarm.
This relay is equipped with SPDT contacts available on the S4B terminal block (item 3, Fig. 5).
•
Relay 2 (REL 2), which is "negative safety" mode, corresponds to the second gas threshold
only. This relay is also equipped with SPDT contacts available on the S4B terminal block (item
4, Fig. 5).
NB: The relay contacts are dry contacts, corresponding to the appliance without power supply.
Caution: The high-power solenoid valves cannot be directly remote controlled
3
. A power relay is
required.
3
The maximum current through the relay contacts will be 2 A and the maximum voltage will be
240 V ~ or 60 V - - -.
Item 3
Item 4
FIGURE 5
