SICK 1058250 WSE4SL-3N1137 NPN Laser Through-beam Sensor Pair

Technical Overview

The SICK WSE4SL-3N1137 is a slim laser through-beam photoelectric sensor pair for small-object detection. An opposing sender and receiver establish a direct optical path, with a 0–50 m sensing range and 0–60 m maximum range. A 650 nm visible red Class 1 laser produces a typical 1 mm spot at 500 mm. Single-button teach-in sets sensitivity, and complementary NPN receiver outputs provide light/dark switching signals to external machine control. Response is ≤0.5 ms under resistive load, with 1,000 Hz operation at a 1:1 light/dark ratio. The Novodur plastic housings use PMMA front screens, M3 threaded mounting holes, IP66/IP67 protection and 2 m four-wire PVC cables. Standard ambient operation is −10 to +50 °C, with conditions specified for extended operation.

Laser through-beam sender/receiver pair with 0–50 m sensing range, Class 1 laser, single-button teach-in and complementary NPN receiver outputs.

Key Features

Opposing laser sender and receiver for small-object detection

0–50 m sensing range; 0–60 m maximum range

650 nm visible red Class 1 laser; typical Ø1 mm spot at 500 mm

Single-button teach-in sensitivity adjustment

Complementary NPN receiver outputs, ≤100 mA

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

10–30 V DC; M3 threaded mounting holes

2 m four-wire PVC cables; do not bend below 0 °C

Novodur housings, PMMA front screens and IP66/IP67

Standard −10 to +50 °C operation; extended operation subject to conditions

Technical Specification Matrix

Parameter	Value
Functional principle	Laser through-beam photoelectric sensing with opposing sender and receiver
Sensing range	0–50 m
Maximum sensing range	0–60 m
Light source	Visible red laser
Wavelength	650 nm
Laser class	1; EN 60825-1:2014, IEC 60825-1:2014 / CDRH 21 CFR 1040.10 and 1040.11
Light spot size	Typically Ø1 mm at 500 mm
Laser service life	Average 50,000 h at ambient +25 °C
Adjustment	Single teach-in button
Special application	Detecting small objects
Digital output	Complementary NPN receiver outputs; maximum output current ≤100 mA
Switching mode	Light/dark switching; Q is light switching
Pin assignment	CD-231: sender BN=L+, BU=M, BK and WH not connected; receiver BN=L+, BU=M, BK=Q, WH=/Q
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; operate in short-circuit protected supply network, maximum 8 A
Residual ripple	<5 Vpp; remain within supply tolerances
Protection class	III
Circuit protection	A: supply reverse-polarity protection; B: inputs and output reverse-polarity protection; C: interference suppression
Housing design	Slim, rectangular
Housing material	Novodur plastic
Front screen	PMMA plastic
Connection	2 m four-wire PVC cables; do not bend below 0 °C
Mounting provisions	M3 threaded mounting holes
IP rating	IP66/IP67
Operating temperature	Standard −10 to +50 °C
Extended operating temperature	−30 to +55 °C, subject to cold-start and high-temperature conditions
Extended operation conditions	At ambient ≥50 °C: maximum supply 24 V and maximum load current 50 mA. Below −10 °C, operation requires starting above −10 °C, then cooling with uninterrupted supply; switching on below −10 °C is not permitted.
Storage temperature	−30 to +70 °C
MTTFD	350 years, EN ISO 13849-1; Parts-Count calculation
DCavg	0%
Individual components	2064096 WS4SL-3D1136 sender; 2064098 WE4SL-3N1132 receiver
Conductor cross-section	0.14 mm²

Parameter

Value

Functional principle

Laser through-beam photoelectric sensing with opposing sender and receiver

Sensing range

0–50 m

Maximum sensing range

0–60 m

Light source

Visible red laser

Wavelength

650 nm

Laser class

1; EN 60825-1:2014, IEC 60825-1:2014 / CDRH 21 CFR 1040.10 and 1040.11

Light spot size

Typically Ø1 mm at 500 mm

Laser service life

Average 50,000 h at ambient +25 °C

Adjustment

Single teach-in button

Special application

Detecting small objects

Digital output

Complementary NPN receiver outputs; maximum output current ≤100 mA

Switching mode

Light/dark switching; Q is light switching

Pin assignment

CD-231: sender BN=L+, BU=M, BK and WH not connected; receiver BN=L+, BU=M, BK=Q, WH=/Q

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; operate in short-circuit protected supply network, maximum 8 A

Residual ripple

<5 Vpp; remain within supply tolerances

Protection class

III

Circuit protection

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

Housing design

Slim, rectangular

Housing material

Novodur plastic

Front screen

PMMA plastic

Connection

2 m four-wire PVC cables; do not bend below 0 °C

Mounting provisions

M3 threaded mounting holes

IP rating

IP66/IP67

Operating temperature

Standard −10 to +50 °C

Extended operating temperature

−30 to +55 °C, subject to cold-start and high-temperature conditions

Extended operation conditions

At ambient ≥50 °C: maximum supply 24 V and maximum load current 50 mA. Below −10 °C, operation requires starting above −10 °C, then cooling with uninterrupted supply; switching on below −10 °C is not permitted.

Storage temperature

−30 to +70 °C

MTTFD

350 years, EN ISO 13849-1; Parts-Count calculation

DCavg

Individual components

2064096 WS4SL-3D1136 sender; 2064098 WE4SL-3N1132 receiver

Conductor cross-section

0.14 mm²

Industrial Applications

1. Counting separated small opaque components

A feeder can mount the sender and receiver on opposite sides of a path carrying separated opaque components. The typical 1 mm spot at 500 mm helps align the direct beam with the intended blocking feature, and teach-in establishes sensitivity with actual parts. External counting logic verifies orientation, clear gaps and controller sampling against the 1,000 Hz switching specification at a 1:1 light/dark ratio.

Problem Solved

A direct beam-interruption reference helps external counting logic track separated components, reducing dependence on component color or reflected intensity after the actual blocking feature and part spacing have been verified.

Small components Direct laser beam External counting

2. Confirming a narrow carrier feature at a transfer

A transfer station can align the sender and receiver across an opaque feature that defines a carrier seated at its expected position. Single-button teach-in establishes detection with representative carriers. External transfer logic evaluates the complementary receiver states after testing real carrier tolerances, feature position and alignment, with the direct optical path kept clear of other moving machine features throughout the transfer sequence.

Problem Solved

A local carrier-position reference helps external transfer control recognize arrival at the intended location, supporting coordinated upstream release when a narrow mechanical feature defines the required seated condition.

Carrier feature Opposed sensing Transfer position

3. Checking an opaque tab on a presented assembly

An assembly station can present a part so an expected opaque tab interrupts the direct laser beam while a surrounding opening leaves it clear. Setup aligns the sender and receiver at the chosen distance and teaches using representative complete and missing-tab samples. External inspection logic evaluates the receiver state at the intended point in the sequence after confirming that other assembly features cannot mask the tab condition.

Problem Solved

A tab-present reference helps external inspection logic flag an assembly with a missing blocking feature, reducing the chance that an expected component omission proceeds unnoticed to the next operation.

Opaque tab Assembly check Direct beam interruption