FM Electronics 4195-GB User manual

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DETECTION RANGE
A PIR’s detection range depends upon the size and temperature of a moving object.
A large and very hot object can be detected at very long distances.
The external PIR is also subject to Extremes of Heat, Cold, Bright sunlight etc. So the
detection range will be greater when the background is cold and less with Bright
sunlight reflecting off background objects.
The 4095 has a nominal detection range of 30 metres. This can reduce to 20 metres
with a bright sun lit background and extend to 40 metres with a dark background.
Vehicles may be detected at a distance of greater than 50 metres.
Side view
Plan view
4195-GB & 4695-GB
DUAL EXTERNAL PIR
This detector is designed for outside use
and employs two narrow angle PIR
detectors one above the other.
Both beams must be triggered to generate
an alarm. Small animals may trigger the
lower beam, but will not cause an alarm.
Like wise the detector is unlikely to be
triggered by Birds, insects or small wind
blown objects..

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LOCATING THE PIR
Ensure that the PIR does not look out over neighbouring property or onto the
Highway. Vehicles at a considerable distance can trigger the PIR.
In this example there are three locations shown to detect someone entering the
property and approaching the House.
A PIR is mounted on a fence post looking towards the road. A fence must block
the PIR off to prevent it detecting passers-by or vehicles driving along the road.
B. The PIR is looking directly across the frontage. This must be blocked by a solid
fence to prevent detecting the neighbour.
C. The PIR is mounted on a front fence post and is blocked off by the Garage or
other building.

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ORIENTATION
The PIR should not point directly East or West if the rising or setting sun will be seen
by the PIR. North South orientation is the only all year round safe direction.
If there is a nearby building or object which shades the setting sun it is O.K. provided
the PIR is shaded before the sun gets below 15 degrees.
If the detector must point East West, then special techniques are required employing
an extended sun shade and tilting the detector downwards, to prevent the PIR
looking directly at the rising or setting sun. (See following section)
SUNRISE & SUNSET
When the rising or setting sun could shine directly into the detector, an extension
shade must be fitted and the detector should be tilted downwards by 6 degrees.

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MOUNTING HEIGHT
Fix the wall bracket at a height of 1.5 metres for maximum detection range, 1.25m for
optimum detection, where 20m or less is required.
(Threaded hole in bracket at the top)
The mounting surface must be rigid and free from vibration. The minimum
dimensions for a wooden support is a 3” x 3” fence post.
Detection patterns at 1.25m & 1.5m mounting height
LIMITING THE DETECTION RANGE
One method to limit the range is to tilt the beam down towards the ground. This is
done by fitting packing behind the top fixings of the mounting bracket. However the
top beam might pick up small animals.
Another method is to slide the bottom lens down to tilt the lower beam downwards.
(The bottom lens normal position is 1.0 mm up from centre.)

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COMPENSATING FOR SLOPING GROUND
If the ground is sloping, the PIR must be tilted accordingly by fitting packing pieces at
the top or bottom edge of the mounting bracket.
Example:
The ground falls away 300mm at a distance of 10m.
300mm

Page 6 of 8 CI-247_03
The following chart shows that 300mm at 10m represents a slope angle of approx.
1.7 degrees which requires 10mm of packing at the top of the mounting bracket.
Rise / Fall
Distance
mm at 10m
Packing mm
at end of
bracket
Angle
degrees
61 2 0.3
91 3 0.5
122 4 0.7
152 5 0.9
183 6 1.0
213 7 1.2
244 8 1.4
274 9 1.6
305 10 1.7
366 12 2.1
427 14 2.4
488 16 2.8
549 18 3.1
610 20 3.5
671 22 3.8
1,067 35 6.1
Rise / Fall at 30 metres
Rise / Fall
Distance
mm at 30m
Packing mm
at end of
bracket
Angle
degrees
183 2 0.3
274 3 0.5
366 4 0.7
457 5 0.9
549 6 1.0
640 7 1.2
732 8 1.4
823 9 1.6
915 10 1.7
1,098 12 2.1
1,280 14 2.4
1,463 16 2.8
1,646 18 3.1
1,829 20 3.5
2,012 22 3.8
3,201 35 6.1

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FIXING AT A GROUND SLOPE ANGLE WHEN THE DETECTOR WILL ALSO BE
ROTATED SIDEWAYS
This will results in the detector ending up tilted to one side. To overcome this,
loosely fix the detector with one central fixing, rotate the detector to the desired
direction. Now rotate the bracket until the PIR is upright. Now mark other fixing
positions and secure the mounting bracket.
SINGLE POINT FIXING TO A MORTAR JOINT
In some applications, drilling into the Brickwork or Stonework is forbidden.
If the detector needs to be tilted for Sun shade or ground slope, one or two strong
fixing into the mortar may be required.
Ensure that the fixing is strong enough to support the PIR adequately.

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LEARNING THE DEVICE
Put the control panel or interface into Learn mode (see unit instructions) loosen the
cover screw until the tamper switch clicks and the tamper operates. The detector will
then send a learn signal to control panel or interface.
WALK TESTING
To select walk test
Loosen the cover screw to operate the tamper switch, a tamper alarm will be
signalled.
Whilst in walk test the two red walk test LED’s are enabled. (Top LED illuminates
when the top sensor is activated and the bottom LED for the bottom sensor.
To come out of walk test
Tighten the cover screw, the tamper restore will be signalled.
The LED’s are now disabled, but the sensor remains in walk test for up to 5 more
minutes.
Normal operation
The detector will have a two minute inhibit after an alarm activation. The detector will
only activate when 2 minutes or more has elapsed without activation.
BATTERY REPLACEMENT
Two AA Alkaline batteries are located inside the top sensor housing. The battery will
normally last for a minimum of two years. If the battery needs replacing the detector
will signal a low battery to the alarm control unit.
The unique features of FM Detectors ensure:
a) A constant 5v is maintained to the radio transmitter, ensuring consistent RF
transmission power regardless of battery voltage.
b) The detector will continue to work at 100% performance for two months after a
low battery is indicated.
South Walk, Vantage Point Business Village, Mitcheldean, Gloucestershire,
GL17 0DD Tel. [phone] email. [e-mail] www.fmelectronics.co.uk
FM Electronics is the Manufacturing division of FM Security Ltd