SICK 1082905 GTB6-N1241 NPN BGS Photoelectric Sensor

Technical Overview

The SICK GTB6-N1241 is a compact photoelectric proximity sensor with background suppression, an infrared LED and an NPN switching output. Its 850 nm light source produces an 8 mm spot at 100 mm, and the specified sensing range extends from 50 to 450 mm. A maximum range of 5–450 mm is documented for a white target with 90% remission. Five-turn mechanical adjustment establishes the detection setting, while selectable light/dark switching adapts the output logic. A response below 1 ms, 500 Hz switching frequency, 2 m cable and IP67 ABS/PC housing support integration into compact automated equipment.

NPN background-suppression sensor with 50–450 mm sensing range, 500 Hz switching, 2 m cable and IP67 housing.

Key Features

Photoelectric proximity sensor with background suppression with NPN switching output

Infrared LED with 850 nm wavelength

Sensing range: 50–450 mm

Light spot: Ø 8 mm at 100 mm

Sensitivity adjustment: Mechanical spindle, 5 turns

Selectable light/dark switching

Response < 1 ms; switching frequency 500 Hz

10–30 V DC operation with protected switching output

2 m PVC cable; IP67 ABS/PC housing

M3 mounting holes and supply/received-light LED indicators

Technical Specification Matrix

Parameter	Value
Functional principle	Photoelectric proximity sensor with background suppression
Sensing range	50–450 mm
Maximum sensing range	5–450 mm on 90% remission white target (DIN 5033)
Light source	LED, infrared light
Wavelength	850 nm
Light spot size	Ø 8 mm at 100 mm
Adjustment	Mechanical spindle, 5 turns
Power supply	10–30 V DC; short-circuit-protected network, max. 8 A
Residual ripple	±10%; remain within supply-voltage limits
Current consumption	30 mA, without load
Protection class	III
Switching output	NPN
Switching mode	Light/dark switching; selectable via rotary selector
Output current	≤ 100 mA; maximum 50 mA above 24 V supply
Response time	< 1 ms with resistive load
Switching frequency	500 Hz at light/dark ratio 1:1
Circuit protection	Supply and input/output reverse-polarity protection; output overcurrent and short-circuit protection
Housing form	Rectangular
Connection	3-wire, 2 m cable; brown L+, blue M, black Q
Conductor cross-section	0.14 mm²
Housing material	ABS/PC plastic
Front screen material	PMMA plastic
Cable material	PVC plastic; do not bend below 0 °C
IP rating	IP67
Operating temperature	−25 to +55 °C; temperature stability after adjustment ±10 °C
Storage temperature	−40 to +70 °C
Mounting	M3 mounting holes
Indicators	Green supply-voltage LED; yellow received-light indicator
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	2.1 x 1.2 x 3.15

Parameter

Value

Functional principle

Photoelectric proximity sensor with background suppression

Sensing range

50–450 mm

Maximum sensing range

5–450 mm on 90% remission white target (DIN 5033)

Light source

LED, infrared light

Wavelength

850 nm

Light spot size

Ø 8 mm at 100 mm

Adjustment

Mechanical spindle, 5 turns

Power supply

10–30 V DC; short-circuit-protected network, max. 8 A

Residual ripple

±10%; remain within supply-voltage limits

Current consumption

30 mA, without load

Protection class

III

Switching output

NPN

Switching mode

Light/dark switching; selectable via rotary selector

Output current

≤ 100 mA; maximum 50 mA above 24 V supply

Response time

< 1 ms with resistive load

Switching frequency

500 Hz at light/dark ratio 1:1

Circuit protection

Supply and input/output reverse-polarity protection; output overcurrent and short-circuit protection

Housing form

Rectangular

Connection

3-wire, 2 m cable; brown L+, blue M, black Q

Conductor cross-section

0.14 mm²

Housing material

ABS/PC plastic

Front screen material

PMMA plastic

Cable material

PVC plastic; do not bend below 0 °C

IP rating

IP67

Operating temperature

−25 to +55 °C; temperature stability after adjustment ±10 °C

Storage temperature

−40 to +70 °C

Mounting

M3 mounting holes

Indicators

Green supply-voltage LED; yellow received-light indicator

Physical Weight (kg)

0.02

Dimensions L x W x H (cm)

2.1 x 1.2 x 3.15

Industrial Applications

1. Workpiece detection in front of a machine frame

An assembly fixture must detect an opaque workpiece without responding to a structure farther behind it. Background suppression separates the intended near target from more distant surfaces within the documented operating geometry. The 50–450 mm sensing range and five-turn adjustment support a defined detection position, while the NPN output supplies the workpiece signal to the controller.

Problem Solved

Distance-based background rejection reduces unwanted detections from the machine structure behind the fixture, giving the sequence controller a clearer indication that the intended workpiece occupies the sensing point.

Background suppression 50–450 mm NPN

2. Counting separated components on a conveyor

A narrow conveyor carrying separated components needs a switching event at each passing part. The sensor directs a infrared sensing spot of approximately 8 mm diameter at 100 mm toward the detection point. Background suppression helps distinguish the raised components from a more distant belt surface, and the 500 Hz switching frequency supports repeated transitions within the specified operating limits.

Problem Solved

A defined optical spot and background rejection help isolate component passages from the belt behind them, supporting repeatable count events without mechanical contact with the moving parts.

Ø 8 mm at 100 mm 500 Hz Background suppression

3. Checking tray seating before a handling cycle

A handling station can direct the sensor toward the expected edge of a seated opaque tray. The short sensing range establishes a local presence check, while background suppression limits responses from surfaces farther away when the tray is absent. The response below 1 ms supplies a prompt input transition, and selectable light/dark switching fits the machine sequence logic.

Problem Solved

A contactless tray-position signal helps the controller distinguish an occupied pickup location from an empty station, supporting coordinated handling without a mechanical feeler at the tray edge.

< 1 ms Light/dark switching Short-range detection