KEYENCE GL-RHG Series - Manual (Page 60)

3-3 Light Interference Prevention Method
3-12 GL-RHG-M-NO3-E
In
sta
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to
a Mac
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3
Interference due to installation
If more than three GL-RHG systems are installed and not connected in series, they should be installed
according to the following information.
(5) If the transmitters and receivers must be on the same side: Ensure adequate distance between
curtain pairs.
Point When installing the GL-RHG in method (2), (3) or (4), installing the devices too closely may
cause reflection in the plane of detection and thus cause interference. Total prevention of light
interference may not be possible even following methods (1) to (5). The operator in charge
must consider adequate light interference prevention method according to the machine or
system where their GL-RHG is installed.
(1) Install shielding (2) If shielding is not possible: Ensure the
transmitters are back-to-back, so as not to
directly face each other.
(3) Tandem installation: Alternate the transmit-
ter and receiver sides.
(4) Side-by-side installation: Alternate the
transmitter and receiver sides.
Re
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Operating
distance "X"
Minimum installation distance "Y"
Less than 3 m 0.26 m
3 m or more
X × tan5° = 0.0875 X
Transmitter Receiver
Transmitter Receiver
Y
X
5°
5° Y
X
Transm
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