Features
Functional principle Photoelectric retro-reflective sensor
Functional principle detail Dual lens
Dimensions (W x H x D) 11 mm x 31 mm x 20 mm
Housing design (light emission) Rectangular
Sensing range max. 0.01 m … 6 m 1)
Sensing range 0.01 m … 5 m 1)
Focus Approx. 4°
Type of light Visible red light
Light source LED 2)
Light spot size (distance) Ø 250 mm (3.5 m)
Angle of dispersion Approx. 4°
Wave length 680 nm
Adjustment Potentiometer, 270°
1) Reflector PL80A.
2) Average service life: 100,000 h at TU = +25 °C.
Mechanics/electronics
Supply voltage 10 V DC … 30 V DC 1)
Ripple ± 10 % 2)

Current consumption 30 mA 3)
Switching output PNP
Switching mode Light/dark switching
Switching mode selector Selectable via light/dark rotary switch
Signal voltage PNP HIGH/LOW UV – 1,8 V / ca. 0 V
Output current Imax. ≤ 100 mA
Response time ≤ 0.5 ms 4)
Switching frequency 1,000 Hz 5)
Connection type Male connector M8, 4-pin
Circuit protection A 6)
B 7)
D 8)
Weight 9 g
Polarisation filter ✔
Housing material Plastic, ABS/PC/POM
Optics material Plastic, PMMA
Enclosure rating IP65
Ambient operating temperature –25 °C … +55 °C
Ambient temperature, storage –40 °C … +70 °C

SICK WTB4-3P2161