SICK 1047653 WLG4S-3F2234V Inox Glass Sensor

Technical Overview

The SICK WLG4S-3F2234V is a stainless steel photoelectric retro-reflective sensor for transparent-object detection in hygienic and washdown zones. Polarized coaxial optics operate without a reflector minimum distance, with 0–3 m sensing and 0–5 m maximum range using PL80A. A 650 nm visible red PinPoint LED produces a 45 mm spot at 1.5 m. Local and external teach-in adjust detection, and a PNP dark-switching output reports the optical state. AutoAdapt supports detection adjustment. Response is below 0.5 ms with resistive load, with 1,000 Hz switching at a 1:1 light/dark ratio. The 316L housing has a PMMA front screen and an M8 four-pin connector; IP69K requires a correctly mounted IP69K connecting cable.

Transparent-object sensor with 0–3 m PL80A range, polarized coaxial optics, AutoAdapt, external teach-in and PNP dark switching.

Key Features

Polarized coaxial retro-reflective sensing; no reflector minimum distance

0–3 m sensing range with PL80A; 0–5 m maximum range

650 nm visible red PinPoint LED; Ø45 mm spot at 1.5 m

Local button plus external teach-in on pin 2

AutoAdapt; attenuation along light beam >8%

PNP dark-switching output, ≤100 mA

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

10–30 V DC; 30 mA without load; M8 four-pin connector

V4A stainless steel 1.4404/316L housing and PMMA screen

IP66/IP67/IP68; IP69K requires a correctly mounted IP69K connecting cable

Technical Specification Matrix

Parameter	Value
Functional principle	Photoelectric retro-reflective sensing with polarized autocollimation / coaxial optics
Special application	Detecting transparent objects; hygienic and washdown zones
Sensing range	0–3 m with PL80A reflector
Maximum sensing range	0–5 m with PL80A reflector
Reflector minimum distance	No minimum reflector distance
Polarization filter	Yes
Light source	Visible red PinPoint LED
Wavelength	650 nm
Light spot size	Ø45 mm at 1.5 m
LED service life	Average 100,000 h at +25 °C
Adjustment	Single local teach-in button and external teach-in on pin 2
AutoAdapt	Yes
Digital output	PNP dark-switching output, maximum current ≤100 mA
Switching mode	Dark 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
Attenuation along light beam	>8%
Power supply	10–30 V DC, reverse-polarity protected; short-circuit protected network, maximum 8 A
Residual ripple	<5 Vpp; remain within supply tolerances
Current consumption	30 mA without load
Protection class	III
Circuit protection	A: supply reverse-polarity protection; B: inputs and output reverse-polarity protection; C: interference suppression
Housing design	Slim rectangular washdown design
Housing material	Stainless steel V4A, 1.4404 / 316L
Front screen	PMMA plastic
Mounting provisions	M3 threaded mounting holes
Connection	Male M8 four-pin connector; maximum tightening torque 0.6 Nm
IP rating	IP66/IP67/IP68; IP69K only with a correctly mounted IP69K connecting cable
Operating temperature	−30 to +60 °C at supply ≤24 V and output current <30 mA
Storage temperature	−30 to +75 °C
MTTFD	1,232 years
DCavg	0%
Physical Weight (kg)	0.04
Dimensions L x W x H (cm)	2.22 x 1.53 x 4.49
External teach input	Pin 2: pulse >2 s at supply voltage for this PNP variant

Parameter

Value

Functional principle

Photoelectric retro-reflective sensing with polarized autocollimation / coaxial optics

Special application

Detecting transparent objects; hygienic and washdown zones

Sensing range

0–3 m with PL80A reflector

Maximum sensing range

0–5 m with PL80A reflector

Reflector minimum distance

No minimum reflector distance

Polarization filter

Yes

Light source

Visible red PinPoint LED

Wavelength

650 nm

Light spot size

Ø45 mm at 1.5 m

LED service life

Average 100,000 h at +25 °C

Adjustment

Single local teach-in button and external teach-in on pin 2

AutoAdapt

Yes

Digital output

PNP dark-switching output, maximum current ≤100 mA

Switching mode

Dark 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

Attenuation along light beam

>8%

Power supply

10–30 V DC, reverse-polarity protected; short-circuit protected network, maximum 8 A

Residual ripple

<5 Vpp; remain within supply tolerances

Current consumption

30 mA without load

Protection class

III

Circuit protection

A: supply reverse-polarity protection; B: inputs and output reverse-polarity protection; C: interference suppression

Housing design

Slim rectangular washdown design

Housing material

Stainless steel V4A, 1.4404 / 316L

Front screen

PMMA plastic

Mounting provisions

M3 threaded mounting holes

Connection

Male M8 four-pin connector; maximum tightening torque 0.6 Nm

IP rating

IP66/IP67/IP68; IP69K only with a correctly mounted IP69K connecting cable

Operating temperature

−30 to +60 °C at supply ≤24 V and output current <30 mA

Storage temperature

−30 to +75 °C

MTTFD

1,232 years

DCavg

Physical Weight (kg)

0.04

Dimensions L x W x H (cm)

2.22 x 1.53 x 4.49

External teach input

Pin 2: pulse >2 s at supply voltage for this PNP variant

Industrial Applications

1. Counting separated clear containers near a washdown line

A packaging conveyor can align the sensor and PL80A reflector across separated clear containers within the 0–3 m sensing range. Teach-in establishes detection using representative container material and contents. External counting logic evaluates the PNP dark-switching output, while installation checks optical alignment, container spacing and the specified switching limits. A correctly mounted IP69K connecting cable is required where the connection must meet that rating.

Problem Solved

A transparent-container passage reference supports external counting logic near a washdown process, while the stated connection requirement helps the installed assembly retain the specified protection at its electrical interface.

Clear containers Washdown installation External counting

2. Confirming a clear carrier in a compact transfer station

A compact transfer station can mount the sensor and PL80A reflector across a defined wall of a clear carrier at its seated position. Coaxial optics operate without a reflector minimum distance, supporting close reflector placement. Setup teaches with representative carriers and verifies background interference, wall geometry and the expected seated tolerance before external transfer control uses the switching state.

Problem Solved

A clear-carrier arrival reference helps external transfer control coordinate upstream release in a confined station, after the actual carrier and reflector arrangement has been checked for distinct occupied and clear states.

Clear carrier Coaxial optics Transfer stop

3. Checking a transparent cover at an inspection nest

An inspection nest can present a transparent cover across the reflected-light path at a defined assembly stage. Teach-in establishes detection using representative covered and uncovered assemblies, with actual curvature, material and presentation tolerance checked during setup. External inspection logic samples the output when the assembly is stationary. The stainless steel housing and PMMA screen support installation choices consistent with the stated hygienic and washdown application.

Problem Solved

A cover-present reference helps external inspection control recognize a missing transparent cover before the assembly advances, reducing dependence on manual checks where the cover transmits much of the sensing light.

Transparent cover Inspection nest Stainless steel housing