SM512 Series Retroreflective Mode Sensors DC sensors with metal housings: SM502A, SM512LB Banner SM512 Series dc retroreflective mode sensors are designed for reliable performance in hostile industrial environ- ments. These sensors have totally-encapsulated circuitry within die-cast metal housings for superior resistance to moisture and physical abuse. Models include: SM502, SM512LB. Model SM502A has a visible red sensing beam and a very fast response time and sensing repeatability. It is intended primarily for code reading applications. Model SM512LB has an infared sensing beam and higher excess gain. It is especially suited to high speed sensing of small parts and precise positioning control. SM512 Series sensors have complementary NPN transistor outputs (one normally open and the other normally closed), which connect directly to Banner MICRO-AMP and MAXI- AMP logic modules, as well as to most logic gates, small relays, and other similar dc loads. Dimension Drawing SPECIFICATIONS, SM512 Series Retroreflective Sensors RANGE: See excess gain curves in individual product descriptions. SUPPLY VOLTAGE: 10-30V dc for SM512LBD; 12-18V dc for SM502A. Maximum allowable ripple 10%; supply current is typi- cally less than 40mA (exclusive of load). OUTPUT CONFIGURATION: Complementary open-collector NPN transistors (one normally open and one normally closed), with continuous short-circuit protection. All models have reverse polarity protection. OUTPUT RATING: Each output transistor is capable of sinking up to 250mA continuously. On-state saturation voltage less than 2 volts at full load and less than 1 volt at signal levels. Off-state leakage current less than 100 microamps. Outputs are reverse-polarity protected. RESPONSE TIME: 1 millisecond on/off. REPEATABILITY: See individual sensor specifications. OPERATING TEMPERATURE: -40 to +70 °C (-40 to +158 °F). CONSTRUCTION: Die-cast metal housing with stainless steel Functional Schematic legend plate. Totally encapsulated; lens assemblies fully gasketed. NEMA 1, 2, 3, 3S, 4, 4X, 12, and 13. Cables are .15-inch diameter, PVC covered, and shielded (4 conductor, 6 feet long). INDICATOR LED: Red LED indicator at rear of sensor (above cable exit) lights when the sensor is receiving a "light" signal. SENSITIVITY ADJUSTMENT: Single-turn adjustment, acces- sible by removing the nylon screw on the side of the sensor. APPLICATION WARNINGS: Outputs will not directly interface TTL logic, due to the reverse- polarity protection diode. Contact the factory for TTL interfacing instructions. The short-circuit protection may de-energize the outputs with certain incandescent light bulb or capacitive loads. Contact the factory if these loads are anticipated. SM512 Series Retroreflective Mode Sensors Retroreflective SM502A mode 1000 3 SM502A SM502A E 2 X 100 OBJECT RETROREFLECTOR C I 1 N E S C with BRT-3 reflector 0 H S E 1 G S 10 A with BRT-T 2 VOLTAGE: 12-18V dc tape II with BRT-3 reflector N 3 RANGE: 6 feet (3 meters) RESPONSE TIME: 1 millisecond 0 2 4 6810 1 .1 FT 1 FT 10 FT 100 FT DISTANCE TO REFLECTOR--FEET REPEATABILITY: 0.03 millisecond DISTANCE SENSING BEAM: visible red, 650nm Model SM502A is a special-purpose retroreflective sensor with a visible red LED light beam. It is intended primarily for code reading of retroreflective code plates in automatic warehousing or identification systems. The beam angle is factory-calibrated to be within 1 degree of the mechanical axis of the sensor package, which permits multiple sensors to be mounted adjacent to one another without concern for optical "crosstalk" or individual alignment. The SM502A will reliably differentiate 1/4-inch wide retroreflective code marks on 1/2-inch centers to a distance of 6 inches, or 1/2-inch marks on 1-inch centers to 12 inches. The SM502A is also the first choice in this sensor family for general-purpose retroreflective applications at ranges out to 3 feet. Required supply voltage is 12-18V dc, and outputs are protected against momentary short-circuits. The case is sealed but not encapsulated. For 24V dc operation, order special sensor model SM502A24V. Retroreflective SM512LB mode 1000 SM512LB 6 SM512LB E X 4 100 C OBJECT RETROREFLECTOR I E 2 with BRT-3 reflector N S with BRT-T tape C S with BRT-3 reflector 0 H E 2 G S 10 A VOLTAGE: 10-30V dc II 4 N 6 RANGE: 15 feet (5 meters) with BRT-1 reflector 1 RESPONSE TIME: 1 millisecond 0 36 9 12 15 .1 FT 1 FT 10 FT 100 FT DISTANCE TO REFLECTOR--FEET REPEATABILITY: 0.3 millisecond DISTANCE SENSING BEAM: infrared, 940nm Model SM512LB is an infrared retroreflective sensor recommended for use in general-purpose applications, especially where high vibration or the presence of fluids, cutting oils, or other liquids dictate the use of a totally-encapsulated sensor. With its 10- 30V dc supply voltage and short-circuit proof output transistors, it is nearly indestructible. It is particularly well-suited to high- speed operation, such as sensing small parts that move quickly through the sensing field. Its fast response time also permits precise positioning control of moving objects (such as in indexing applications), and the 1-millisecond response time is totally independent of received light signal strength. Due to a lens design that reduces "proxing", excess gain falls off rapidly at close ranges. If an application requires sensing a retroreflective target at a range of less than about 6 inches, consider model SM502A. 2