Zone Monitor (Model 55000-8451IMC)


The Zone Monitor powers and controls a zone of up to 20 Series 65 conventional fire detectors from a loop of DEMCO’s addressable detectors and interfaces.

The Zone Monitor is loop powered and operates at 17–28V DC with protocol pulses of 5–9V. It is supplied with a backbox for surface mounting, and is also available without the backbox for flush mounting. Both versions are for indoor use only. Two LEDs, one red and one yellow, are visible through the front of the enclosure. The red LED indicates that a fire condition has been detected on the zone wiring. The yellow LED is lit when the built-in isolator has sensed a short circuit loop fault.

  • Loop powered and operates at 17–28V DC.
  • Supplied with a backbox for surface mounting.
  • Fitted with a bi-directional short-circuit isolator.
  • For indoor use only.
Zone Voltage (loop voltage ?22V) 19V±1V
Zone voltage (loop voltage <22V Loop voltage -1.5V
Switch-on surge, max 150ms 3.5mA
Quiescent 4mA + detector load
Operating Temperature –20°C to +70°C
Humidity (no condensation) 0–95% RH
IP rating 54
Dimensions of Zone Monitor Unit (surface mount) 150 x 90 x 48 mm
Weight 230g

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