• 10 to 30V dc supply voltage with bipolar NPN/PNP outputs
  • Available in opposed, opposed clear plastic, polarized and non-polarized retroreflective, convergent, diffuse and divergent diffuse, and glass or plastic fiber optic sensing modes
  • Convergent and fiber optic models with infrared or visible red, blue or green LED light source, depending on application
  • Opposed-mode models for clear plastic detection
  • 18 mm threaded barrel or side mounting options

Product Specifications

Supply Voltage and Current10 to 30V dc (10% max. ripple) @ less than 25 mA (exclusive of load)
RangeOpposed (long range):30 m
Opposed (short range:3 m
Opposed (clear plastic):0.3 m
Non-polarized Retroreflective:5 m, range is specified using one model BRT-3 retroreflector
Polarized Retroreflective:50 mm to 2 m, range is specified using one model BRT-3 retroreflector
Polarized Retroreflective (extended range):10 mm to 3 m, range is specified using one model BRT-3 retroreflector
Diffuse (long range):380 mm
Diffuse (short range):300 mm
Divergent Diffuse:130 mm
Convergent:16, 43 or 49 mm, depending on model
Plastic and Glass Fiber Optic:Range varies by sensing mode and fiber optics used
Supply Protection CircuitryProtected against reverse polarity and transient voltages
Output ConfigurationBipolar:One NPN (current sinking) and one PNP (current sourcing); light operate (LO) or dark operate (DO) selectable
Output Rating150 mA max. each output @ 25° C, derated to 100 mA @ 70° C (derate approximately 1 mA per ° C) OFF-state leakage current:less than 1 µA
Output saturation voltage:
PNP:less than 1V @ 10 mA and less than 2V @ 150 mA
NPN:less than 200 mV @ 10 mA and less than 1V @ 150 mA
Output Protection CircuitryProtected against false pulse on power-up and continuous overload or short circuit of outputs
Output Response TimeResponse time is independent of signal strength. Sensors will respond to either a light or dark signal of 1 millisecond or longer duration, 500 Hz max. Note:Models may be ordered with 0.3 millisecond ON/OFF by adding suffix MHS to the model number (example, SM312LVMHS). This modification reduces sensing range and excess gain.
Delay at Power-up100 milliseconds; outputs do not conduct during this time.
RepeatabilityRepeatability is independent of signal strength. Opposed:0.14 milliseconds
Non-polarized and Polarized Retroreflective, Diffuse, Convergent, Glass and Plastic Fiber Optic:0.3 milliseconds
AdjustmentsLight/Dark-operate select switch and 15-turn slotted brass screw sensitivity (Gain) adjustment potentiometer, clutched at both ends of travel. Both controls are located on rear panel of sensor and protected by a gasketed, clear acrylic cover.
IndicatorsAlignment Indicating Device system (AID) lights a rear-panel mounted red LED indicator whenever the sensor sees a light condition, with a superimposed pulse rate proportional to the light signal strength (the stronger the signal, the faster the pulse rate).
ConstructionReinforced thermoplastic polyester housing, totally encapsulated, o-ring sealing, acrylic lenses and stainless-steel screws
Environmental RatingNEMA 1, 2, 3, 3S, 4, 4X, 6, 12 and 13; IEC IP67
ConnectionsPVC-jacketed 4-conductor 2 m or 9 m cables, or 4-pin Euro-style QD. QD cable are ordered separately.
Operating ConditionsTemperature:-20° to +70° C
Relative humidity:90% @ 50° C (non-condensing)


Data Sheets

Document Name Part Number File Size Download
1. MINI-BEAM SM312 Series, Plastic Fiber Optic Models
(Suffix FP1)
61308 Download
2. MINI-BEAM Series, Clear Plastic Detection models 03458 Download
3. MINI-BEAM SM312 Series, DC Models 69943 Download
4. MINI-BEAM SM312 Series, dc models
52980 Download
5. MINI-BEAM SM312 Series, dc models
(Convergent, Visible Red LED)
03365 Download

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