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10 Instruction 3015-4256
Connecting External Alarms
Overview
The HGMSZ includes four SPDT relays whose contacts are rated 3 A at 240 VAC. These relays are used
for the connection of external alarm devices that are activated when the relay is energized. The relays are
factory assigned to energize under the following conditions:
Relay #1 Leak Alarm Point 100 ppm
Relay #2 Spill Alarm Point 300 ppm
Relay #3 Evacuate Alarm Point 500 ppm
Relay #4 Fault System Fault Event
Note that the alarm points of relays #1, #2, and #3 are set using the monitor’s LEAKLVL, SPILLLVL,
and EVACLVL function screens (Page 17).
Connection
Use any of the service knockouts to gain cable access to the interior of the monitor. Locate the external
alarm relay connector (Page 8) and remove it from the circuit board. Secure the leads from the external
alarm device and its power source to the connector as shown in the diagram below. When you are through
securing the connections, carefully plug the connector back onto the circuit board.
The second diagram on Page 11 shows a typical connection to Relay 1. Note how power to the alarm device
is being tapped off the monitor’s AC input.
External Alarm Relay Connector
Each relay may be connected as normally open (NO), or normally closed (NC).
The relay contacts are rated 3 A at 250 VAC.
Power for the external alarm devices may be supplied from an external power source, or from
the monitor’s AC input terminal strip.