detectors ultimate detection range will vary according to the background temperature and the size, speed
and clothing of the intruder. The LRP 180QH is designed and tested to detect a normally clothed, normal size
adult, moving at slow or medium walking pace across the zones. Variations in size and clothing, background
temperature, speed and direction of motion may result in the ultimate detection range being less (or more) than
180 metres.
Fig. 2 shows the schematic principles of the system. Note that both ‘near’ and ‘far’ systems use dual-channel
signal processing and event-memory circuits which require intruder detection to occur in both channels within a
time period in order to be accepted as an alarm condition.
An alarm condition in either ‘near’ or ‘far’ systems sets the line interface to provide various levels of line current
which are translated into relay activation at the control unit. An open-circuit (zero line current) or removal of the
control unit lid will activate the tamper relay.
INSTALLATION
Important
: The LRP 180QH contains fragile optical components and must be handled with care. Before
installation, check that the unit is free from damage and that no loose objects are rattling around inside.
When planning the location, remember that all PIR detectors respond best when the intruder crosses the zones.
IF THE GROUND IS NOT LEVEL AND HAS DIPS, INTRUDERS MAY CROSS BELOW THE ZONES WHEN
WALKING IN THESE DIPS AND NOT BE DETECTED. CAREFUL SYSTEM PLANNING IS STRONGLY
RECOMMENDED.
The detector head MUST be securely mounted on a firm vertical surface using all four holes in the wall bracket.
It is recommended that the expansion bolts (supplied) be used when wall mounting. If the detector head or its
mounting surface moves during high winds, false alarms may result. (Even a half degree movement left and
right will mean that the furthest zones will pan over 3 metres.)
The top surface of the head unit should be parallel with the ground. If the ground is level a spirit level may be
used to set the head ready for walk-testing. (See Fig. 3+4)
When fixing the control unit, fix to a vertical surface with the cable glands at the bottom.
Fig. 2
SIGNAL
PROCESSOR
SIGNAL
PROCESSOR
SIGNAL
PROCESSOR
SIGNAL
PROCESSOR
EVENT
MEMORY
EVENT
MEMORY
EVENT
MEMORY
EVENT
MEMORY
LOGIC
PROCESSOR
LOGIC
PROCESSOR
LINE
INTERFACE
QUAD
SENSOR
QUAD
SENSOR
TWO CORE
NEAR DETECTOR
FAR DETECTOR
SIGNAL LINE
SUPPLY
TAMPER/FAULT
RELAY
MEGARED HEAD
NEAR DETECTOR
RELAY
FAR DETECTOR
RELAY
MEGARED CONTROLLER
