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Panasonic ST4 Instruction Manual
2.3 Protection Area
21
Install this device at a distance of at least A m (provided as follows) away from reflective
surfaces such as metal walls, floors, ceilings, work pieces, covers, panels or glass surfaces.
A
A
A
∂°
∂°
Reflective ceiling
Reflective floor
Emitter
Sensing range
L
Receiver
Reflective surface
Side view
Top view
Emitter
Sensing range L
Distance between emitter and receiver (sensing
range
L
)
Allowable installation distance
A
0.1 to 3m
0.16m
3 to 15 m
L/2 x tan 2
∂
= L x 0.053m (
∂
= 3°)
NOTE
The effective aperture angle for this device is ±2.5° (when L > 3m) as required by
IEC 61496-2/UL 61496-2. However, install this device away from reflective
surfaces, taking into consideration an effective aperture angle of ±3° to account
for beam misalignment during installation.
Allowable distance from sensor beam axis to reflective surface
0.8
0.6
0.4
0.2
0
5
10
15
Do not install in this area
Install in this area
Allowable installation distance
A
(m)
Distance between emitter and receiver L (m)
2.3.4 Placement
of
Emitter and Receiver
You can install a system in which multiple sets of controllers and their respective sensors face
each other. Use this configuration if there is a problem in wiring or additional equipment has to
be protected. If you arrange multiple sets, perform an operation test (see page 46).
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