M12 Series Metal Barrel Sensors Rugged, self-contained sensors in a 12 mm threaded barrel Features Complete family of sensors, all housed in a compact 12 mm threaded metal barrel Opposed, retroreflective, polarized retroreflective, diffuse and 25, 50, or 75 mm cutoff fixed-field mode operation, depending on model Excellent background suppression on fixed-field models an excellent alternative to proximity sensors Two Signal indicator LEDs for easy operating status monitoring from any direction 10 to 30V dc operation Complementary solid-state outputs (1 normally open, 1 normally closed) PNP (sourcing) or NPN (sinking), depending on model Models Sensing Mode Model* Range Output Sensing Mode Model* Range Output Performance based on use of 90% reflectance white test card. 660 nm Visible Red M12E N/A Effective Beam: 680 nm Visible Red 10 mm (0.39 ) 25 mm (1 ) M12PFF25 PNP 5 m M12PR PNP cutoff (16.4 ) 25 mm (1 ) focus M12NFF25 NPN OPPOSED M12NR NPN 660 nm Visible Red M12PLP PNP M12PFF50 50 mm (2 ) PNP 1.5 m cutoff P (4.9 ) 25 mm (1 ) FIXED-FIELD POLAR RETRO NPN M12NLP NPN M12NFF50 focus 660 nm Visible Red M12PFF75 75 mm (3 ) PNP M12PLV PNP cutoff 2.5 m 25 mm (1 ) (8.2 ) NPN M12NFF75 focus RETRO M12NLV NPN * Only standard 2 m (6.5 ) cable models are listed. For 9 m (30 ) cable, add suffix Performance based on use of 90% reflectance white test card. W/30 to the model number (e.g., M12E W/30). 660 nm Visible Red QD models: PNP M12PD 4-pin integral Euro-style M12 connector: add suffix Q8 (e.g., M12EQ8). 400 mm 4-pin 150 mm (6 ) Euro-style pigtail: add suffix Q5 (e.g., M12EQ5). (15.7 ) Retroreflective range is specified using one model BRT-84 retroreflector. Actual M12ND NPN DIFFUSE sensing range may be more or less than specified, depending upon efficiency and reflective area of the retroreflector(s) used. WARNING . Not To Be Used for Personnel Protection Never use these products as sensing devices for personnel protection. Doing so could lead to serious injury or death. These sensors do NOT include the self-checking redundant circuitry necessary to allow their use in personnel safety applications. A sensor failure or malfunction can cause either an energized or de-energized sensor output condition. Consult your current Banner Safety Products catalog for safety products which meet OSHA, ANSI and IEC standards for personnel protection. Printed in USA 03/09 P/N 129721 rev. E Polarized Diffuse Retro Opposed Retro Fixed-FieldM12 Series Metal Barrel Sensors Overview Power LED Banner s M12 family of sensors offers a full complement of sensing modes, all packaged in a compact yet rugged metal housing. Their popular 12-mm threaded barrel design allows them Signal LED to mount easily into tight spaces, with the excellent performance expected of much larger (one of two) sensors. Single-turn Gain The single-turn Gain potentiometer on most models and two Signal LEDs (positioned on either Potentiometer side of the housing for visibility) provide easy alignment and configuration for reliable sensing (see Figure 1). Note that when the signal LED is not ON, the green Power LED is visible through all three LED ports. Green ON Steady Power ON Green Flashing Output overloaded Fixed-Field Mode Overview Yellow ON Steady Light sensed M12 Series fixed-field sensors are powerful diffuse-mode sensors with far-limit cutoff (a type Yellow Flashing Marginal excess gain of background suppression). Their high excess gain and fixed-field technology allow them to detect objects of low reflectivity that are directly in front of another surface, while ignoring the Figure 1. Features surface in the background. The cutoff distance is fixed. Backgrounds and background objects must always be placed Cutoff Distance beyond the cutoff distance. Object B Receiver Object or Elements A Fixed-Field Sensing Theory of Operation Background Lenses Near In operation, the M12FF compares the reflections of its emitted light beam (E) from an object R1 Detector back to the sensors two differently-aimed detectors R1 and R2 (see Figure 2). If the near Far detector (R1) light signal is stronger than the far detector (R2) light signal (see object A, closer R2 Detector than the 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 beyond the cutoff distance), the sensor ignores the object. E Emitter The cutoff distance for model M12FF sensors is fixed at 25, 50, or 75 mm (1 , 2 , or 3 ). Sensing Objects lying beyond the cutoff distance are ignored, even if they are highly reflective. Range However, it is possible to falsely detect a background object, under certain conditions (see Object is sensed if amount of light at R1 Background Reflectivity and Placement). is greater than the amount of light at R2 In the drawings and discussion on these pages, the letters E, R1, and R2 identify how the Figure 2. Fixed-field concept sensors three optical elements (Emitter E, Near Detector R1, and Far Detector R2) line up across the face of the sensor. The location of these elements defines the sensing axis (see Figure 3). The sensing axis becomes important in certain situations, such as those illustrated in Figures 6 and 7. Fixed-Field Sensor Setup Sensing Reliability For best sensing reliability, the sensor-to-object distance should be positioned to maximize excess gain. The excess gain curves for these sensors are shown on page 5. Sensing at higher excess gains will make maximum use of the sensors available sensing power. The Sensing background must be placed beyond the cutoff distance more reflective backgrounds must be Axis placed further back. Following these two guidelines will improve sensing reliability. As a general rule, the most reliable sensing of an object approaching from the side occurs when the line of approach is parallel to the sensing axis. Figure 3. Fixed-field sensing axis Banner Engineering Corp. Minneapolis, MN U.S.A www.bannerengineering.com Tel: 763.544.3164 2 P/N 129721 rev. E E R2 R1