Zone Monitor with Isolator, 55000-845IMC

The Context Plus Zone Monitor is designed to connect and control a zone of conventional fire detectors within an addressable fire alarm system.

The catalogue states that the unit can power and control a zone of up to 20 Series 65 conventional fire detectors from a loop of Context Plus addressable detectors and interfaces.

The unit incorporates a bidirectional short-circuit isolator, helping it remain unaffected by loop short circuits on either the loop input or loop output.

Key Features:

• Supports a zone of up to 20 Series 65 conventional fire detectors.
• Loop-powered operation.
• Built-in bidirectional short-circuit isolator.
• Returns an analogue value of 16 during the normal condition.
• Returns an analogue value of 64 when a detector enters the alarm state.
• Latches internally in the alarm state until reset.
• Monitors open-circuit and short-circuit faults.
• Uses a 5.1kΩ end-of-line resistor.
• An active end-of-line monitor may be used as an alternative.
• Red LED indicates a detected fire condition.
• Yellow LED indicates a short-circuit isolator fault.
• Suitable for surface or flush mounting.
• Designed for indoor use only.

Technical Specifications:

• Product number: 55000-845IMC.
• Loop operating voltage: 17 to 28V DC.
• Protocol voltage pulses: 5 to 9V.
• Zone voltage at loop voltage of 22V or above: 19V ±1V.
• Quiescent current: 4mA plus detector load.
• Alarm current: 11mA.
• Short-circuit current: 11mA.
• Stabilisation time at power-up: 4 seconds.
• Operating temperature: -20°C to +70°C.
• Humidity: 0 to 95% RH, non-condensing.
• Protection rating: IP54.
• Surface-mounted dimensions: 150 × 90 × 48mm.
• Weight: 230g.