Specifications

Halogen Gas Monitor – MultiZone Remote Display
Instruction 3015-5157 16
Connecting External Alarms
Overview
Two SPDT relays are available for the connection of external alarm devices. These alarms are useful for
alerting the user to global conditions anywhere on the network. Each relay can be programmed to respond to
alarm, fault, or ready conditions.
Connection
Use the AC conduit or any of the remaining service knockouts to gain access to the interior of the HGM-RD.
Locate the relay connector (Page 12) and remove it from the circuit board. Secure the wire leads to the
connector orienting them as shown in the diagram below. When you are through securing the connections,
carefully plug the connector back onto the circuit board.
HGM-RD Relay Connector
NOTE: Each relay can be connected as normally open (NO), or normally closed (NC).
Power for the external alarms can be tapped off the AC IN connector.
The relay contacts are rated .5 A at 250 VAC and 1.0A at 30 VAC.
(This is in the MZ manual. Do you want it here too?)
Jumper the ‘Neutral’ of the input power
connector to the ‘Common’ on the relay
block. Connect one end of strobe or horn to
the ‘NO’ of whichever level of alarm is
appropriate for application. The other end of
strobe or horn is connected to the ‘Line’ of
the input power connector (5 A maximum).
Strobe or
Horn
NO
COMMON
NC
L
I
N
E
N
E
U
T
R
A
L
Leak / Spill / Evacuate / Faul
t
Red* Yellow*
RELAY
Normal configuration:
Strobes are usually connected
to the Leak relay (#1)
Horns are usually connected
to the Spill relay (#2).
External Power:
AC < 250V
DC < 15W
Note: The device does not power
accessories; power must come from
an external source.
LINE POWER
*The colors correspond to
the LEDs on the front of the
case.