The LC-171 is unique motion detector utilizing dual passive infra-red elements and Microwave
technology for use outdoors and in harsh environments.
The LC-171 is designed for outdoor use in the most severe climatic conditions and may also
accommodate pets.
High reliability is achieved by combining both dual tech hardware with highly sophisticated
software and an adaptive coverage area, greatly reducing the possibility of false alarms.
The active elements are comprised of a dual element PIRand advanced Microwave detector
inside a stylish, rigid plastic body.
This special optics combined with state of the art microwave Doppler sensor assures elimination
of “false alarms” while maintaining high security standards for the detection of human intruders
into the protected area.
The detection sensitivity and range is controlled by a digital rotary switch allowing 16 calibration
levels, so that the correct detection pattern will be set for every installation.
The LC-171 is designed to protect large areas and can easily be installed on walls or poles in
order to provide a solid area of protection while rejecting interference from birds and small
animals due to the provided pet immunity optics.
2 Features
• Microwave detection based on Doppler concept.
• N.O. & N. C. Relays switched at the same time.
• Pet immunity up 35kg.
• 16 levels of PIR sensitivity adjustment and 3 microwave sensitivity groups.
• Temperature compensation.
• Microcontroller signal processing.
• Front and back tamper protection.
• Audible indication of walk test and intruder detection.
• Unique waterproof sealed plastic design.
• Detection Range: Up to 18m
• Detect human intruders walking or running.
• No maintenance required.
• High RFI/EMI Immunity.
• Protection from: direct sunlight, wind up to 30 m/sec, snow and rain, small animals, removal of
the top cover and removal from mounting bracket
3
3 Assembly description
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The LC-171 is a robust detector which includes a large LED indicator that can be easily observed
from long distances and an optional buzzer to provide indication of intrusion.
Using the supplied mounting bracket, the LC-171 can be easily mounted to walls using mounting
screws and poles using the supplied metal bands.
The LC-171 is combined of three detection elements:
• Upper PIR element
• Lower PIR element
• Microwave element
• The upper PIR element has an adjustable detection height while the other two are fixed.
The following drawing shows all internal elements:
LED
Range setting handle
Terminal Connection Blocks
Range Indication
Upper PIR element
Tamper switch
LED and Buzzer dipswitches
Lower PIR element
Sensitivity setting
Direction Angle Indicato
Bracket locking screw
4
4 Detection Pattern
The LC-171 has a 90° top view PIR and MW detection pattern with over 18m detection distance
(when installed at 1.2m above the ground surface).
The LC-171 has an internal rotating housing (which includes the 2 PIR elements and the MW)
that can be adjusted horizontally, so its 90° coverage may vary between 0° and 180°.
Detection area
Microwave detection pattern Detection
No Detection
Lower PIR element detection pattern
Fixed to 18m range
No pet detection in
all protected area
Upper PIR element detection pattern
Adjustable between 3m and 18m (10 ft to 59 ft)
The LC-171 can differentiate between pets and human bodies and alert accordingly by
having microwave movement detection combined with two PIR detection beams:.
A. Lower PIR element which is fixed to 18m range and 60cm above ground level which helps
avoiding pet detection over the entire area.
B. Upper PIR element which has adaptive range between 3 and 18m.
An intrusion is defined by both PIR detection beams being crossed and a Microwave detection
occurring, causing an alarm.
No alarm will be generated if only one of the PIR detection beams is crossed and microwave
detection occurs.
5
5 Selecting mounting location
The installation of the LC-171 requires a solid, level base for the mounting bracket and must be
located in a manner that when the detector is mounted, it is facing the center of the desired
detection zone.
The protected area must be free from obstacles like walls, fences, trees, ditches and other
microwave detectors.
Choose a location most likely to intercept an intruder according to detection pattern on page 5.
Avoid the Following Installation Locations:
• Facing direct sunlight.
• Facing areas subject to rapid temperature changes.
• Mounted at more than 10º from the vertical or horizontal plane.
• Facing metal doors.
• Near direct sources of heat or airflow.
• Clear all physical obstacles from the detection area
(e.g. Plants, laundry, etc.)
• Clear all light reflecting surfaces from the detection area,
including puddles or other standing water.
• Avoid installation on the following types of ground:
Thick vegetation, Grass (un-mown), Water, Sand and Metal.
NOTE:
Recommended installation height is 1.2m.
The DOUBLE DUAL high quality sensor detects motion crossing the beam; it is less sensitive
detecting motion towards the detector.
The LC-171 performs best when provided with a constant and stable environment.
In order to ensure suitable operation of the LC-171 type of ground should be one of the following:
Asphalt concrete, Cement, Soil, Clay, Gravel or Grass (mown).
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