WORLD-BEAM QS18 Adjustable-Field Sensors Datasheet Miniature sensors with visible red LED or visible red laser Exceptional optical performance, comparable to larger sensors Simple multi-turn screw adjustment of cutoff distance 10 to 30 V dc operation, with complementary (SPDT) NPN or PNP outputs, depending on model Less than 1 millisecond output response for excellent sensing repeatability Laser Models: Narrow effective beam (approx. 1 mm spot size) for small-object detection and precise position control Crosstalk rejection algorithm to avoid optical disturbance from adjacent sensors Class 2 models have reduced excess gain within 20 mm of sensor for decreased susceptibility to the effects of lens contamination and to allow use of external lens shield LASER ADJUSTABLE-FIELD (some models) Models 1 Models Sensing Beam Range Cordset Supply Voltage Output Type QS18VN6AF100 1 mm (0.04 in) to cutoff point NPN 660 nm Visible Red Adjustable cutoff point, 20-100 LED QS18VP6AF100 PNP mm (0.8 in-4 in) QS18VN6LAF 1 mm (0.04 in) to cutoff point NPN 650 nm Visible Red 2 m (6.5 ft) 4- Adjustable cutoff point, 30-150 10 to 30 V dc Class 1 Laser wire QS18VP6LAF PNP mm (1.2 in-6 in) QS18VN6LAF250 20 mm (0.08 in) to cutoff point NPN 658 nm Visible Red Adjustable cutoff point, 50-250 Class 2 Laser QS18VP6LAF250 PNP mm (2 in-10 in) 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. 1 Only standard 2 m (6.5 ft) cable models are listed. For 9 m (30 ft) cables: add suffix W/30 to the model number (e.g., QS18VN6AF100 W/30). For 4-pin Pico-style pigtail QD: add suffix Q to the model number (e.g., QS18VN6AF100Q) accessory mating cordset required. For 4-pin Euro-style pigtail QD: add suffix Q5 to the model number (e.g., QS18VN6AF100Q5) accessory mating cordset required. Original Document 20 May 2014 66981 Rev. I 66981 WORLD-BEAM QS18 Adjustable-Field Sensors Overview The QS18 Adjustable-Field Sensors are a full-featured sensor in a miniature package. It provides background suppression sensing capability for small or difficult-to-reach areas. Models are available with a visible red LED sensing beam, or one of two visible red lasers (see Models on page 1). These adjustable-field sensors are able to detect objects of relatively low reflectivity, while ignoring other objects in the background (beyond the cutoff point). The cutoff distance is mechanically adjustable, using the 5-turn adjustment screw on the sensor top (see Figure 1 on page 2). Backgrounds and background objects must always be placed beyond the cutoff distance. 1. Green: Power Indicator (Flashes for Output Overload) 2. Amber: Light Sensed Indicator (Flashes for Low Gain Conditions) 3. Cutoff Point Adjustment Screw Figure 1. Sensor features Adjustable-Field Sensing Theory of Operation The sensor compares the reflections of its emitted light beam (E) from an Cutoff object back to the sensors two differently-aimed detectors R1 and R2 Distance Receiver (see Figure 2 on page 2). If the near detector (R1) light signal is Object B Elements or stronger than the far detector (R2) light signal (see object A, closer than Object Background A the cutoff distance), the sensor responds to the object. If the far detector Near (R2) light signal is stronger than the near detector (R1) light signal (see R1 Detector Lenses object B, object beyond the cutoff distance), the sensor ignores the object. Far R2 Detector The cutoff distance for these sensors is adjustable. Objects lying beyond the cutoff distance are ignored, even if they are highly reflective. However, it is possible to falsely detect a background object, under certain conditions (see Background Reflectivity and Placement on page E 3). In the drawings and discussion on these pages, the letters E, R1, and R2 identify how the sensors three optical elements (Emitter E, Near Sensing Detector R1, and Far Detector R2) line up across the face of the Range sensor. The location of these elements defines the sensing axis (see Figure 3 on page 3). The sensing axis becomes important in certain Figure 2. Adustable field sensing concept situations, such as those illustrated in Figure 7 on page 4 and Figure 8 on page 4. 2 www.bannerengineering.com - tel: 763-544-3164 P/N 66981 Rev. I