SICK 1065929 WL2SG-2P3235 PNP Transparent-object Sensor

Technical Overview

The SICK WL2SG-2P3235 is a miniature photoelectric retro-reflective sensor for detecting transparent objects. Polarized coaxial optics work without a reflector minimum distance, providing a 0–0.55 m sensing range and 0–1.2 m maximum range with P250F. A 640 nm visible red PinPoint LED produces a 12 mm spot at 250 mm. Cable-based adjustment and AutoAdapt support setup, while a PNP light-switching output connects to external machine control. Response is below 0.5 ms with a resistive load, and switching frequency is 1,000 Hz at a 1:1 light/dark ratio. The ABS/PC housing, PMMA optics, IP67 protection and 200 mm PVC cable with M8 four-pin connector support compact installation.

Miniature transparent-object retro-reflective sensor with 0–0.55 m P250F range, PinPoint LED, AutoAdapt, cable teach-in and PNP light switching.

Key Features

Transparent-object detection using polarized coaxial retro-reflective optics

No reflector minimum distance

0–0.55 m sensing and 0–1.2 m maximum range with P250F

640 nm visible red PinPoint LED; Ø12 mm spot at 250 mm

Cable teach-in through pin 2; AutoAdapt

PNP light-switching output, ≤50 mA

<0.5 ms response with resistive load; 1,000 Hz at 1:1 light/dark ratio

10–30 V DC; 20 mA without load

200 mm PVC cable with M8 four-pin connector; do not bend below 0 °C

ABS/PC housing, PMMA optics, IP67; −20 to +50 °C operation

Technical Specification Matrix

Parameter	Value
Functional principle	Photoelectric retro-reflective sensing with polarized coaxial/autocollimation optics
Special application	Detecting transparent objects
Sensing range	0–0.55 m with P250F reflector
Maximum sensing range	0–1.2 m with P250F reflector
Reflector minimum distance	No minimum distance with coaxial optics
Light source	Visible red PinPoint LED
Wavelength	640 nm
Light spot size	Ø12 mm at 250 mm
LED service life	Average 100,000 h at ambient +25 °C
Adjustment	Cable teach-in through white wire / pin 2
AutoAdapt	Yes
Digital output	PNP light-switching output; maximum output current ≤50 mA
Switching mode	Light switching
Pin assignment	1 BN=L+; 2 WH=Teach; 3 BU=M; 4 BK=Q (CD-092)
Response time	<0.5 ms signal transit time with resistive load
Switching frequency	1,000 Hz at 1:1 light/dark ratio
Power supply	10–30 V DC, limit values
Residual ripple	<5 Vpp; remain within supply tolerances
Current consumption	20 mA without load
Circuit protection	A: supply reverse-polarity protection; B: output reverse-polarity protection; D: outputs overcurrent and short-circuit protection
Polarization filter	Yes
Housing design	Rectangular
Housing material	ABS/PC plastic
Optics material	PMMA plastic
Connection	200 mm PVC cable with male M8 four-pin connector; do not bend below 0 °C
Conductor cross-section	0.09 mm²
Cable diameter	Ø3 mm
Mounting provisions	Fixing holes Ø3.2 mm, drawing center axes
IP rating	IP67
Operating temperature	−20 to +50 °C
Storage temperature	−40 to +75 °C
MTTFD	1,987 years
DCavg	0%

Parameter

Value

Functional principle

Photoelectric retro-reflective sensing with polarized coaxial/autocollimation optics

Special application

Detecting transparent objects

Sensing range

0–0.55 m with P250F reflector

Maximum sensing range

0–1.2 m with P250F reflector

Reflector minimum distance

No minimum distance with coaxial optics

Light source

Visible red PinPoint LED

Wavelength

640 nm

Light spot size

Ø12 mm at 250 mm

LED service life

Average 100,000 h at ambient +25 °C

Adjustment

Cable teach-in through white wire / pin 2

AutoAdapt

Yes

Digital output

PNP light-switching output; maximum output current ≤50 mA

Switching mode

Light switching

Pin assignment

1 BN=L+; 2 WH=Teach; 3 BU=M; 4 BK=Q (CD-092)

Response time

<0.5 ms signal transit time with resistive load

Switching frequency

1,000 Hz at 1:1 light/dark ratio

Power supply

10–30 V DC, limit values

Residual ripple

<5 Vpp; remain within supply tolerances

Current consumption

20 mA without load

Circuit protection

A: supply reverse-polarity protection; B: output reverse-polarity protection; D: outputs overcurrent and short-circuit protection

Polarization filter

Yes

Housing design

Rectangular

Housing material

ABS/PC plastic

Optics material

PMMA plastic

Connection

200 mm PVC cable with male M8 four-pin connector; do not bend below 0 °C

Conductor cross-section

0.09 mm²

Cable diameter

Ø3 mm

Mounting provisions

Fixing holes Ø3.2 mm, drawing center axes

IP rating

IP67

Operating temperature

−20 to +50 °C

Storage temperature

−40 to +75 °C

MTTFD

1,987 years

DCavg

Industrial Applications

1. Counting separated clear containers

A packaging feeder can mount the sensor opposite a P250F reflector so separated clear containers pass through the reflected-light path. Cable teach-in establishes detection using actual container material, wall shape and contents. External counting logic evaluates the PNP light-switching output, with spacing and sampling checked against the 1,000 Hz specification at a 1:1 light/dark ratio and the 0–0.55 m P250F sensing range.

Problem Solved

A transparent-container passage reference helps external counting logic track clear products whose transmitted light makes ordinary opaque-object detection unsuitable, after actual container presentation and separation have been verified.

Clear containers PNP light switching External counting

2. Confirming a clear carrier at a transfer stop

A compact transfer station can align the sensor and P250F reflector across a defined wall of a clear carrier at its seated position. Coaxial optics avoid a reflector minimum distance, and the 200 mm cable with M8 connector supports local installation. Setup teaches using representative carriers and verifies that nearby machine features remain outside the intended optical path throughout carrier movement.

Problem Solved

A clear-carrier position reference helps external transfer control recognize arrival at the intended location, supporting coordinated upstream release after carrier wall geometry and the seated position have been checked.

Clear carrier Coaxial optics Transfer position

3. Checking a transparent cover on a presented assembly

An assembly nest can present a transparent cover across the reflected-light path at a defined inspection point. Cable teach-in establishes detection with representative covered and uncovered assemblies, while the transparent-object sensing function evaluates the cover condition. External inspection logic samples the switching output at the intended stage after verifying cover material, curvature, presentation tolerance and nearby background interference on the actual assembly.

Problem Solved

A cover-present reference helps external inspection logic identify an assembly missing its transparent cover, reducing the chance that a cover omission proceeds unnoticed to the following operation.

Transparent cover Assembly inspection Cable teach-in