INST.No.INE-508-P0
-5-
3.3 Precautions for installation
(1) Vibration and impacts
The detector unit is designed to withstand the vibration of 29.4m/s
2
(3G), but vibration or
impacts reduce the liability of the detector unit in the long term and cause an unstable
measurement by the position movement of a measuring area.
When vibration is intense especially, it is effective to insert cushion materials like a rubber
board between the detector unit and a fixing stand.
(2) Induction
The detector unit is designed for anti-induction but install it as far as possible from
induction heating equipment or power lines.
(3) Working temperature and humidity
The working temperature of the detector unit is 0 to 50°C. When the ambient temperature
is higher than 50°C or reflection from a measuring area or hot air is strong, use the
protective case for cooling the detector unit by water.
When the ambient temperature does not exceed but closely reaches to 50°C, it is recommended
to cool the detector unit by water for maintaining of its reliability.
In addition, control humidity in environment as low as possible. High humidity absorbs and
scatters thermal radiation in the optical path.
(4) Optical path
Select a place where water-drops, dust, smoke, steam, etc. do not enter between the detector
unit and a measuring area.
If such place cannot be selected and the affection by existence of such substances cannot be
ignored, purge such substance with air or other arrangements are necessary.
(5) Measurement distance
The measurement distance of the detector unit can be arbitrarily changed in 0.5 to 10m but,
since the scanning angle is constant, the scanning width of a measuring area becomes large
as the measurement distance becomes large.
Allow for a margin of the scanning width in consideration of fluctuation of a measuring
area, displacement of the optical path, etc.
Scanning width = 2 X (Measurement di 47)
x
tan25°
Scanning
angle
50°
Measurement
distance
47
Scanning width
Scanning center
3. Detector unit
