KEYENCE GL-RHG Series User Manual
Page 24
1-2
Part Description
1-10
GL-RHG-M-NO1-E
Bef
o
re Use
1
Beam center-line: An optical path joining the optical center of the emitting element on the transmitter to
the optical center of the corresponding receiving element on the receiver. The
GL-RHG must be installed so that the beam center-line mark on the transmitter and
that on the receiver face one another and are located at the same height.
Protective height: The height from the top beam center-line to the bottom beam center-line (length).
Detection height: An object approaching the protective zone from the top of the protective height is first
detected at point A, which is the distance of the detection capability from the top of the
protective height. The equivalent position on the bottom is called point B. The height from
the top edge of the specified target detection capability that exists at point A to the bottom
edge of the specified target detection capability that exists at point B is called the "detec-
tion height".
The following calculation formula can be defined:
Detection height = "Protective height" + (2 × "specified target detection capability") –
"beam axis diameter".
* Refer to the following diagram for an explanation of beam center-line, protective height and detection height.
Protective zone:
The zone in which the specified target detection capability can be detected. The detec-
tion zone of the GL-RHG indicates a square area formed with the protective height and
the operating distance. When an object of the specified target detection capability is
present in this area, the light of the GL-RHG is blocked, and then the OSSD goes to
OFF state.
Detection zone:
The square area formed with the detection height and the operating distance, which is
broader than the protective zone. When an object of the specified target detection capabil-
ity is present in this area, the light of the GL-RHG is blocked, and then the OSSD goes to
OFF state.
* Refer to the following diagram for protective zone and detection zone.
Beam center-line mark
Beam center-line
Specified target detection
capability (position A)
Specified target detection
capability (position B)
Protective
height
a: Beam axis spacing
b: Beam axis diameter
c: Detection capability
a
b
c
Detection
height
Protective zone
Detection zone
Specified target detection capability
Protective height
Detection height
Operating distance