WORLD-BEAM QS18 Adjustable-Field Sensors Miniature sensors with visible red LED or visible red laser Features Exceptional optical performance, comparable to larger sensors Simple multi-turn screw adjustment of cutoff distance 10 to 30V 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 po- sition 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 suscepti- bility to the effects of lens contamination and to allow use of external lens shield LASER ADJUSTABLE-FIELD (some models) Models Models Sensing Beam Range Cordset* Supply Voltage Output Type QS18VN6AF100 1 mm (0.04 in) to cutoff point NPN 660 nm Visible Adjustable cutoff point, 20-100 Red LED QS18VP6AF100 PNP mm (0.8 in-4 in) QS18VN6LAF 1 mm (0.04 in) to cutoff point NPN 650 nm Visible Adjustable cutoff point, 30-150 2 m (6.5 ft) 4-wire 10 to 30V dc Red Class 1 Laser QS18VP6LAF PNP mm (1.2 in-6 in) QS18VN6LAF250 20 mm (0.08 in) to cutoff point NPN 658 nm Visible Adjustable cutoff point, 50-250 Red Class 2 Laser QS18VP6LAF250 PNP mm (2 in-10 in) * 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, see Quick-Disconnet (QD) Cordsets on page 9. For 4-pin Euro-style pigtail QD: add suffix Q5 to the model number (e.g., QS18VN6AF100Q5) accessory mating cordset required, see Quick-Disconnet (QD) Cordsets on page 9. WARNING: Not To Be Used for Personnel Protection Never use this product as a sensing device for personnel protection. Doing so could lead to seri- ous injury or death. This product 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 ener- gized or de-energized sensor output condition. Overview The QS18 Adjustable-Field Sensors are a full-featured sensor in a miniature package. It provides background suppression sensing capa- bility 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). P/N 66981 web 6/7/2012 Rev. I WORLD-BEAM QS18 Adjustable-Field Sensors These adjustable-field sensors are able to detect objects of relatively low reflectivity, while ignoring other objects in the background (be- yond the cutoff point). The cutoff distance is mechanically adjustable, using the 5-turn adjustment screw on the sensor top (see Figure 1. Sensor features on page 2). Backgrounds and background objects must always be placed beyond the cutoff distance. 1 Green: Power Indicator (Flashes for Output Overload) Yellow: Light Sensed Indicator (Flashes for Low Gain 2 Conditions) 3 Cutoff Point Adjustment Screw Figure 1. Sensor features Adjustable-Field Sensing Theory of Operation Cutoff The sensor compares the reflections of its emitted light beam (E) from an object Distance Receiver back to the sensors two differently-aimed detectors R1 and R2 (see Figure 2. Object B Elements or Object Adustable field sensing concept on page 2). If the near detector (R1) light sig- Background A nal is stronger than the far detector (R2) light signal (see object A, closer than the Near R1 Detector Lenses cutoff distance), the sensor responds to the object. If the far detector (R2) light signal is stronger than the near detector (R1) light signal (see object B, object be- Far R2 Detector yond the cutoff distance), the sensor ignores the object. The cutoff distance for these sensors is adjustable. Objects lying beyond the cut- off distance are ignored, even if they are highly reflective. However, it is possible to falsely detect a background object, under certain conditions (see Background E Reflectivity and Placement on page 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 Detector R1, and Far Sensing Range Detector R2) line up across the face of the sensor. The location of these ele- ments defines the sensing axis (see Figure 3. Sensing Axis on page 3). The Figure 2. Adustable field sensing concept sensing axis becomes important in certain situations, such as those illustrated in Figure 7. Object beyond cutoff problem on page 4 and Figure 8. Object be- yond cutoff solution on page 4. 2 www.bannerengineering.com - tel: 763-544-3164 P/N 66981 web Rev. I