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PIR Motion Detection
The PIR sensor is an optical sensor that detects motion by measuring the infrared
heat given off by objects. The sensor is calibrated to detect the heat range of
human body temperature. The sensor has a lens that breaks the viewing angle of
the sensor into zones that focus the light onto different sections of the sensing
element. It is the movement of the infrared frequency moving in and out of a
zone that defines motion.
The infrared light emitted is stronger when people are closer to the sensor.
Sensor range is measured in two planes; the ceiling height to 36" off the floor or
table/desk height and the second, the linear distance from the sensor.
Sensor Range
The MOS sensor is offered with two different lens. There is a lens with a high
sensor ray density pattern suitable for small motion detection however this lens
has shorter range. The second lens has a broader range but is less sensitive for
small motion detection.
Sensor range can be separated into two fields of detection:
1. Small motion - this is the area closest to the sensor and can detect small
movement such as hand waving, picking up a coffee cup or answering the
phone. The small movement effective area will decrease as the ceiling
height increases.
Do not use the MOS sensor for ceiling height applications where small
movement detection is needed and the ceiling height is greater than 9 feet.
2. Large motion - this is the area surrounding the small motion area extending
to the sensor's range limit. The further from the sensor, the more diluted
the sensor ray pattern becomes requiring larger body motion such as
walking to trigger occupancy.
2
CEILING MOUNT ARRAY
CM 0.77 GI V5
40ft mounting height
TOP VIEW:
12.2m
(40ft)
6.1m
(20ft)
0
6.1m
(20ft)
12.2m
(40ft)
SIDE VIEW:
0
6.1m
(20ft)
9.1m
(30ft)
12.2m
(40ft)
12.2m
(40ft)
fresnel technologies inc.
101W. MORNINGSIDE DR. FORT WORTH, TX 76110, U. S. A. (817) 926-7474, FAX:(817)
drawing and design
2014
FRONT VIEW :
Notch Radius 1.52mm (0.060in)
C L
CEILING MOUNT ARRAY
CM 0.77 GI V5
40ft mounting height
High Bay Lens (C)
6300 sq.ft @ 40 ft.
TOP VIEW:
12.2m
(40ft)
6.1m
(20ft)
0
6.1m
(20ft)
12.2m
(40ft)
12.2m
(40ft)
SIDE VIEW:
0
6.1m
(20ft)
9.1m
(30ft)
12.2m
(40ft)
12.2m
9.1m
(40ft)
(30ft)
fresnel technologies inc.
101W. MORNINGSIDE DR. FORT WORTH, TX 76110, U. S. A. (817) 926-7474, FAX:(817)926-7146
drawing and design
2014
9.1m
6.1m
3.0m
3.0m
0
0
3.0m
(30ft)
(20ft)
(10ft)
(10ft)
(10ft)
Detector Position
Grooved Side
FRONT VIEW :
Detector Position
Grooved Side
Notch Radius 1.52mm (0.060in)
C L
80' max (24.4m)
6.1m
6.1m
9.1m
12.2m
3.0m
0
3.0m
(20ft)
(10ft)
(10ft)
(20ft)
(30ft)
(40ft)
6.1m
9.1m
12.2m
6.1m
9.1m
12.2m
(20ft)
(30ft)
(40ft)
(20ft)
(30ft)
(40ft)
11.68
(0.4
15°
7
(
C L
11.68mm
C L
(0.46in) 19.56mm
(0.77in)
15°
52.5mm
(2.066in)
7.82mm
(0.308in)
C L
C L
Note: The "beam" pat
obtained depends stron
on the detector used w
this array. The pattern
shown is intended sole
as a general guide.
Note: The "beam" pattern
obtained depends strongly
on the detector used with
this array. The pattern
shown is intended solely
as a general guide.
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