Product Category

Photomicrosensor with Amplifier and Cable

EE-SPW321 / 421

Compact, Thin-profile Photomicrosensor with special amplifier.


EE-SPW321, EE-SPW421

EE-SPW321-A, EE-SPW421-A

Sensing distance

300 mm *1

Sensing object

Opaque: 2 mm dia. min. *2

Directional angle

10° to 40°

Light source

GaAs infrared LED (pulse lighting) with a peak wavelength of 940 nm


Light indicator (Red LEDs, one each on Sensor and Amplifier)

Supply voltage

12 to 24 VDC ±10%, ripple (p-p): 5% max.

Current consumption

Average: 30 mA max.

Control output

NPN open collector, Load power supply voltage: 12 to 24 VDC,
 Load current: 100 mA max.,
 OFF current: 0.5 mA max.
 Residual voltage: 1 V max (at a 100-mA load current)

Response time

1 ms max. for both detection and reset

Ambient illumination

3,000 lx max. (incandescent light); 10,000 lx max. (sunlight) on the receiver

Ambient temperature range

-20 to +55°C

Ambient humidity range

5% to 85%

Vibration resistance

Destruction: 10 to 55 Hz, 1.5-mm double amplitude for 2 h each in X, Y, and Z directions

Shock resistance

500 m/s2

Degree of protection


Connecting method

Pre-wired (standard cable length: 2 m)

Cable length from emitter
 (receiver) to amplifier

0.5 m

1 m

Weight (Packaged)

76 g



ABS resin


Acrylate resin


Slits: One sheet with 16 total slits (0.5 × 3 mm, 1 × 3 mm, 3 × 0.5 mm, 3 × 1 mm;
 four each) included
 Sems screws with spring washers and flat washers: Six M2.6 × 12
 Instruction Manual

1. Refer to Receiver Output Vs. Sensing Distance Characteristics on the Catalog.
 2. Detection of objects up to 0.5 mm wide is possible by using slit installation.