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Datasheet
Miniature Polarized Retroreflective Laser Sensors
• Visible Class 1 laser
• Narrow effective beam provides small-object detection and precise position control
• Crosstalk rejection algorithm protects against optical disturbance from adjacent
sensors
• Excellent optical performance throughout sensing range, even close up
• 10 to 30 V dc operation, with complementary (SPDT) NPN or PNP outputs, depending
on model
• Bright LED operating status indicators are visible from 360°
• Compact, rugged sealed housing, protected circuitry
• Mounting versatility – popular 18 mm threaded barrel or side-mount
• Choose 2 m (6.5 ft) or 9 m (30 ft) cable or one of four QD options
Excellent for applications where high sensing power and small beam size are important.
Uses a special filter to polarize the emitted light, filtering out unwanted reflections from
shiny objects.
P
POLAR RETRO
Models Sensing Range Spot Size at Focus Cable Output
QS18VN6LLP 650 nm Visible Red Class 1
Laser: 0.1 to 10 m (0.33 ft
to 33 ft)
Approximately 4 mm at 10 m
(0.16 in at 33 ft)
4-wire, 2 m (6.5
ft) integral cable
NPN
QS18VP6LLP PNP
Standard 2 m (6.5 ft) cable models are listed. To order a 9 m (30 ft) cable model, add the suffix “W/30” to the model
number (e.g., QS18VN6LLP W/30).
To order QD models with a 4-pin integral Euro-style QD, add suffix “Q8” (e.g., QS18VN6LLPQ8); to order a 4-pin Euro-
style 150 mm (6 in.) pigtail QD, add suffix “Q5” (e.g., QS18VN6LLPQ5); to order a 4-pin integral Pico-style QD, add suffix
“Q7” (e.g., QS18VN6LLPQ7); to order a 4-pin Pico-style 150 mm (6 in.) pigtail QD, add suffix “Q” (e.g., QS18VN6LLPQ).
Models with a QD connector requires a mating cable.
WARNING: Not To Be Used for Personnel Protection
Never use this device as a sensing device for personnel protection. Doing so could lead to
serious injury or death. This device does not include the self-checking redundant circuitry necessary
to allow its use in personnel safety applications. A sensor failure or malfunction can cause either an
energized or de-energized sensor output condition.
Installation Notes
Conventional retroreflective photoelectric sensors are extremely easy to align. Beam angles are wide, and retro targets are
forgiving to the light beam’s angle of incidence. The beam of this laser sensor is very narrow, compared with the beam of
most retro sensors. As the figure indicates, the effect of angular misalignment can be dramatic. Alignment is critical
because the beam may miss the retroreflective target unless the target is large.
For example, with one BRT-51X51BM mounted at a distance of 6 m (20 ft) from the sensor, one degree of angular
misalignment will cause the center of the laser beam to miss the center of the target by 100 mm (4 inches).
WORLD-BEAM
®
QS18LLP Series
P/N 118900 Rev. D 20 November 2013
0 118900 3