AGNI DEVICES PVT. LTD.

Vikas Puri, Delhi

The Context Plus XP95 Zone Monitor powers and controls the operation of a zone of up to 20 Series 65 conventional fire detectors from a loop of Context Plus analogue addressable detectors and interfaces.

FEATURESThe Zone Monitor is factory preset to return an analogue value of 16 when all detectors on the zone are in quiescent state and 64 when a detector changes to the alarm state. The Zone Monitor latches in the alarm state. 5.1k! end-of-line resistor is fitted to detector cables for open- and short-circuit faults. Alternatively, an active end-of-line monitor may be used in conjunction with diode bases and a capacitor of up to 50F fitted at the Zone Monitor wiringterminals.

In either case an analogue value of 4 is transmitted during open- or short-circuit faults. The Zone Monitor is fitted with a bi-directional short circuit isolator and will be unaffected by loop short circuits on either the loop input or loop output.

ELECTRICAL CONSIDERATIONS

The Zone Monitor is loop powered and operates at 1728V DC with protocol pulses of 59V.

MECHANICAL CONSTRUCTION

The Zone Monitor 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 cover of the enclosure. The red LED is illuminated to indicate that a fire alarm condition has been detected on the zone wiring.

The yellow LED is illuminated whenever the built-in isolator has sensed a short circuit loop fault.

NOTES ON USE

1.Zone voltage is regulated to 19 1V for any loop voltage greater than 22V. If the loop voltage falls below 22V, the zone voltage is approximately 1.5V below the loop voltage. It is important to ensure that under worst-case conditions, the zone voltage is above the minimum operating voltage for the conventional detectors.

2.Alarm conditions are latched internally by the Zone Monitor. It is therefore necessary to reset the alarm even if non-latching conventional detectors are used.

3.Manual call points can be located at any point in the zone wiring if active end-of-line monitoring with diode detector bases is used. If a 5.1k! resistor is used for monitoring, manual call points must be connected between the Zone Monitor and the first detector.

The Context Plus XP95 Switch Monitor is designed to monitor the state of one or more single pole, volt-freecontacts connected on a single pair of cables and to report the status to Context Plus compatible control equipment.

FEATURESThe Switch Monitor provides four input states to the control equipment: Normal, Fault, Pre-alarm and Alarm. The Switch Monitor has a red LED to indicate an alarm and two yellow LEDs to indicate a switch input wiring fault or a loop short-circuit wiring fault. The Switch Monitor is fitted with a bi-directional short-circuit isolator and will be unaffected by a single short-circuit on either loop input or output.