MINI-BEAM SM2A312D Self-contained AC-operated Diffuse Mode Sensors Compact, modulated, self-contained diffuse proximity mode sensors for 24-240V ac operation 2-wire hookup for convenient installation Range to 380 mm (15 in) (referenced to 90% reflectance white test card) Switch-selectable for light operate or dark operate SPST SCR solid-state output switches up to 300mA low leakage current and saturation voltage Rugged, epoxy-encapsulated construction: meets NEMA standards 1, 2, 3, 3S, 4, 4X, 12 and 13 IEC IP67 Physically and electrically interchangeable with 18 mm barrel-type photoelectrics Infrared, 880 nm MINI-BEAM Diffuse Mode Supply Output Excess Gain Beam Pattern Models Range Cable Voltage Type Performance based on 90% reflectance white test card 1000 SM2A312D E SM2A312D 15 mm 0.6 in X Diffuse Mode Diffuse Mode C 10 mm 0.4 in 100 E 5 mm 0.2 in S SPST 0 0 S SM2A312D 380 mm 2 m (6.5 ft) 5 mm 0.2 in 24-240V ac Solid-state 10 G SM2A312DQD (15 in) 3-Pin Micro QD 10 mm 0.4 in A 2-Wire I 15 mm 0.6 in N 1 0 75 mm 150 mm 225 mm 300 mm 375 mm 3.0 in 6.0 in 9.0 in 12.0 in 15.0 in 1 mm 10 mm 100 mm 1000 mm .04 in .4 in 4 in 40 in DISTANCE DISTANCE For Standard MINI-BEAMs: i) 9 m (30 ft) cables are available by adding suffix W/30 to the model number of any cabled sensor (e.g. - SM2A312D W/30). ii) A 150 mm (6 in.) long pigtail cable with attached QD connector is available by adding suffix QDP to the model number of any MINI-BEAM sensor (e.g. - SM2A312DQDP). See page 5 for more information. iii) A model with a QD connector requires an accessory mating cable. See page 8 for more information. Printed in USA P/N 03376L7G MINI-BEAM Sensors SM2A312D MINI-BEAM Installation and Alignment Proper operation of the SM2A312D sensor requires that it be mounted securely and aligned properly. Excessive movement or vibration can result in intermittent or false operation caused by loss of alignment. For best results, final-mount the SM2A312D in an Diffuse Mode Alignment 18mm-hole by its threaded barrel or use a mounting bracket (see page 6). 1) Begin with the sensor at the desired distance from the object to be sensed, and at the approximate position where it will be mounted. The background should be as far behind the object as possible (at least three times the distance of the sensor from the object), and as dark a color as possible compared to the object. Ideally, the object should present its largest reflective surface to the sensor. SM2A312D 2) Switch the sensor to light-operate mode. With the object in the sensing position, apply power to the sensor, and advance the 15-turn GAIN control to maximum (clockwise end of rotation). The GAIN control is clutched at both ends to avoid damage, and will free-wheel when either endpoint is reached. If the sensor is seeing its reflected light, the alignment LED should be on. Move the sensor up-down-right-left (include angular rotation) to find the center of movement zone within which the LED remains lit. Reducing the GAIN setting (if necessary) will reduce the size of the movement zone and make more precise alignment possible. 3) Repeat the alignment motions after each GAIN reduction. When you are satisfied that you have obtained optimum alignment, mount the sensor solidly in that position. Increase the GAIN to maximum. Test the system by removing the object from the sensing position. The receiver LED indicator should go off. If the LED indicator does SM2A312D not go off, the sensor is reacting to light reflected from a background surface. 15 Turn Reduce the GAIN setting until the alignment indicator goes off, plus two additional Gain Adjustment full turns. Again place the object in the sensing position. If the alignment indicator and Light/Dark does not come on, the sensor is receiving as much or more light energy from the Operate Switch* background as from the object. Consider the following alternatives: Gasketed Acrylic Cover a) move the sensor closer to the object and reduce the sensitivity (GAIN) Red LED lights when the b) reduce background reflectivity by painting the background with flat-black sensor s output is conducting paint, or by scuffing the background or cutting a hole through it c) tilt the sensor or the background so that the sensing beam is not perpendicular to the background. * Note regarding Light/Dark operate switch: Turn switch fully clockwise for light operate (sensor outputs conduct when object is present) Turn switch fully counterclockwise for dark operate (sensor outputs conduct when object is absent) page 2 Object Up Left Right Down