Cut Sheet

Quick Start Guide
Self-contained photoelectric sensors
Sensor Features
Gain (Sensitivity) Adjustment Screw
Alignment Indicator Device (AID)*
Light/Dark Operate Select Switch
Clockwise: Light Operate
(outputs conduct when sensing
light is received).
Counterclockwise: Dark Operate
(outputs conduct when sensing
light is not received).
*U.S. Patent no. 4356393
WARNING: Not To Be Used for Personnel Protection
Never use this device as a sensing device for personnel protection. Doing so could lead to
serious injury or death. This device 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
energized or de-energized sensor output condition.
Models
Model
1
Sensing Mode Range LED
SMA31E Opposed Emitter
3 m (10 ft)
Infrared, 880 nm
SM2A31R Opposed Receiver
SMA31EL Opposed Emitter - Long Range
30 m (100 ft)
SM2A31RL Opposed Receiver - Long Range
SMA31EPD Opposed Emitter Clear Plastic Detection 0 to 300 mm (0 to 12 in)
Actual range varies, depending
upon the light transmission
properties of the plastic
material being sensed.
Visible red, 650 nm
SM2A31RPD Opposed Receiver Clear Plastic Detection
SM2A312LV Non-Polarized Retroreflective 5 m (15 ft)
SM2A312LVAG Polarized Retroreflective 50 mm to 2 m (2 in to 7 ft)
SM2A312LP
Extended-Range Polarized
Retroreflective
10 mm to 3 m (0.4 in to 10 ft)
SM2A312D
Diffuse
380 mm (15 in)
Infrared, 880 nm
SM2A312DBZ 300 mm (12 in)
SM2A312W Divergent Diffuse 130 mm (5 in)
1
Standard 2 m (6.5 ft) cable models are listed.
• 9 m (30 ft) cable: add suffix “W/30” (for example, SMA31E W/30).
• 3-pin Micro-style QD models: add suffix “QD” (for example, SMA31EQD).
MINI-BEAM
®
ac-Voltage Series
Original Document
69942 Rev. C
9 October 2015
69942