Banner QS18VP6LLP Polarized Retroreflective Laser Sensor

Class 1 laser retroreflective sensing out to 10 m in an 18 mm barrel

The QS18VP6LLP is the PNP version of the QS18LLP polarized retroreflective laser sensor from Banner Engineering. A visible red 650 nm Class 1 laser projects a narrow beam, about 4 mm across at 10 m, so the sensor can see small objects and hold tight position control where a conventional LED retro sensor would let them slip through. A polarizing filter removes false returns from shiny packaging and metal surfaces.

The housing is the familiar QS18 right-angle body: it screws into an 18 mm threaded hole through the nose or bolts on from the side, and a 2 m four-wire PVC cable is fitted on the standard model. Two LEDs on top report power and light-sensed status, with a flashing amber condition when excess gain falls to between 1 and 1.5 times.

Technical specifications

Where a laser retro sensor earns its place

Because the beam is narrow, the datasheet gives a minimum detectable object size against distance: 2.5 mm at 0.3 m, 5 mm at 1.5 m, 6.5 mm at 3 m, 10 mm at 6 m and 13 mm at 10 m, measured with a BRT-51X51BM reflector and about 10 times excess gain. That makes the sensor a fit for beam-break counting of small parts, wire and rod presence, and long-reach detection across a conveyor or doorway where there is no room for an emitter and receiver pair.

The same narrow beam makes alignment critical. Banner points out that one degree of misalignment moves the beam centre 100 mm at 6 m, so a swivel bracket such as the SMB18SF or SMB3018SC is worth specifying, and a temporary strip of retroreflective tape is the suggested aid for sighting the visible beam onto the target.

Ordering and variants

The base number is QS18VP6LLP for PNP; QS18VN6LLP is the NPN counterpart from the same datasheet. Adding Q8 gives an integral 4-pin M12 connector, Q5 a 150 mm cable with M12, Q7 an M8 connector and Q a 150 mm cable with M8. Models with a connector need a separate mating cordset. The 9 m cable variants marked W/30 are listed by the manufacturer as no longer available but are still covered by the document.

Documents and quotation

Use the request form to ask for this model with your exact code. The attached Banner QS18LLP Polarized Retroreflective Laser Series Sensor datasheet, p/n 118900 Rev. M (manufacturer, unaltered) lists all variants and options, and the output type and connector suffix should be confirmed before the order is released. Other products of this kind can be found in Sensors & Transmitters.