Photoelectric Proximity Sensor GTB2F-N1131 SICK 35 mm NPN IP67
Overview:
The GTB2F-N1131 from SICK is a photoelectric proximity sensor with background suppression, part of the ultra-slim G2 Flat series. It offers a sensing distance of 35 mm, NPN output, and a highly focused PinPoint red LED (660 nm) with a Ø4 mm light spot. With the ability to detect objects as small as 0.1 mm and a housing thickness of only 3.5 mm, combined with IP67 protection, this sensor is ideal for high-precision automation applications in confined spaces, such as electronics assembly, robot pick-and-place systems, and component inspection.
Product Overview of the Photoelectric Proximity Sensor GTB2F-N1131
The GTB2F-N1131 is specifically engineered for applications requiring exceptional accuracy in extremely limited installation spaces. Its background suppression technology combined with a PinPoint LED produces a tightly focused light beam, enabling reliable detection of objects as small as 0.1 mm with minimal influence from the background — even when the background surface is light or dark.
With an ultra-thin 3.5 mm housing, 800 Hz switching frequency, and 0.1 mm repeatability, this model is particularly well-suited for:
- Electronics and SMD component handling machines
- Robot pick-and-place systems
- High-speed packaging machines
- Position inspection and missing component detection systems
- Precision mechanical automation lines
The sensor operates reliably in industrial environments with a 10–30 VDC supply voltage, NPN output, and comprehensive protection (reverse polarity, short-circuit, and interference).
Key Features
- Sensing distance: 1 mm … 35 mm (standard: 1–30 mm at 90% remission)
- Smallest detectable object: 0.1 mm (at 5 mm)
- Light source: PinPoint LED, 660 nm wavelength
- Output: NPN, max. output current ≤ 50 mA
- Protection rating: IP67, operating temperature: –20°C … +50°C
Technical Specifications – GTB2F-N1131
| Parameter |
Value |
| Model |
GTB2F-N1131 |
| Part No. |
1093725 |
| Functional principle |
Photoelectric proximity sensor |
| Functional principle detail |
Background suppression |
| Dimensions (W×H×D) |
14 × 24 × 3.5 mm |
| Sensing distance (max.) |
1 mm … 35 mm |
| Sensing distance (standard) |
1 mm – 30 mm (90% remission, DIN 5033) |
| MDO (minimum detectable object) |
0.1 mm (at 5 mm distance) |
| Light source |
Red light (PinPoint LED), 660 nm |
| Light spot size |
Ø 4 mm (at 30 mm) |
| Adjustment |
None |
| Supply voltage (UB) |
10–30 VDC |
| Ripple |
< 5 Vpp |
| Current consumption |
20 mA (no load) |
| Output |
NPN |
| Switching mode |
Light switching |
| Max. output current |
≤ 50 mA |
| Response time |
< 0.625 ms (resistive load) |
| Switching frequency |
800 Hz (light/dark ratio 1:1) |
| Connection |
3-wire cable, 2 m |
| Circuit protection |
A (reverse polarity) + C (interference) + D (short-circuit) |
| Housing material |
Plastic, VISTAL® |
| Optics material |
Plastic, MABS |
| Weight |
22 g |
| Protection rating |
IP67 |
| Repeatability |
0.1 mm |
| Hysteresis |
< 2 mm |
| Operating temperature |
–20°C … +50°C |
| Storage temperature |
–40°C … +70°C |
| Certifications |
EU/UK/ACMA/Morocco CoC, China RoHS, cRUus |
Source: SICK GTB2F-N1131 Datasheet, 2026. Download datasheet PDF
Industrial Applications of the GTB2F-N1131
- Electronics & Semiconductors: The extremely small PinPoint light spot (Ø4 mm at 30 mm) and 0.1 mm detection capability enable precise SMD component inspection, missing component detection on PCBs, and chip classification in high-precision assembly lines.
- Packaging & Food Industry: Background suppression allows reliable object detection on conveyors regardless of background surface; the 800 Hz switching frequency supports high-speed production lines.
- Precision Machinery & CNC: Stable sensing range of 1–30 mm with 0.1 mm repeatability is ideal for cutter position monitoring, small machined part detection, and fixture position verification.
- Robotics & Automation: The 3.5 mm ultra-thin housing integrates easily into grippers and robot arms. The standard 3-wire NPN output connects directly to most PLCs and robot controllers.
- Pharmaceutical & Medical: IP67 rating ensures reliable operation in clean environments; background suppression reliably distinguishes blister packs and vials from machine backgrounds.
AUMI has supplied the GTB2F-N1131 to numerous electronics factories in Hanoi and Bac Ninh for automated component inspection projects, significantly reducing defect escape rates through reliable detection of parts as small as 0.1 mm.
Comparison: GTB2F-N1131 vs GTB2F-N1111
The SICK G2 Flat series includes multiple sensing range variants. The GTB2F-N1131 and GTB2F-N1111 share the same housing and background suppression principle but differ in sensing distance and light spot size:
| Parameter |
GTB2F-N1131 |
GTB2F-N1111 |
| Part No. |
1093725 |
1093724 |
| Sensing distance (max.) |
1 mm … 35 mm |
1 mm … 18 mm |
| Sensing distance (standard) |
1–30 mm (90% remission) |
1–15 mm (90% remission) |
| Light spot size |
Ø 4 mm (at 30 mm) |
Ø 2.5 mm (at 15 mm) |
| Hysteresis |
< 2 mm |
< 0.5 mm |
| Switching mode |
Light switching |
Light switching |
| Output |
NPN |
NPN |
| Dimensions |
14 × 24 × 3.5 mm |
14 × 24 × 3.5 mm |
| Protection rating |
IP67 |
IP67 |
Conclusion:
- Choose the GTB2F-N1131 when a longer sensing distance (up to 35 mm) is required.
- Choose the GTB2F-N1111 when a smaller light spot (Ø2.5 mm) and extremely low hysteresis (< 0.5 mm) are needed for higher precision at short distances.
Frequently Asked Questions (FAQ)
Q1: What is the operating principle of the GTB2F-N1131?
The GTB2F-N1131 operates on the background suppression principle, allowing reliable object detection within a defined range with minimal influence from the background.
Q2: What is the sensing distance of the GTB2F-N1131?
The sensor has a maximum sensing distance of 35 mm and a standard sensing range of 1 to 30 mm with 90% remission objects.
Q3: What applications is the GTB2F-N1131 suitable for?
It is ideal for electronics machinery, robot pick-and-place systems, small component inspection, high-speed conveyors, and precision automation systems.
Q4: Does the GTB2F-N1131 have NPN or PNP output?
The GTB2F-N1131 features a 3-wire NPN transistor output and operates on 10–30 VDC.
Q5: Can the GTB2F-N1131 be replaced by another model?
It can be replaced by the GTB2F-N1111 for shorter-range applications or by the GTB2F-E1131 when a PNP output is required by the PLC.
Contact for Purchasing the Photoelectric Proximity Sensor GTB2F-N1131
AUMI – Official SICK Distributor in Vietnam. Full manufacturer warranty, complete CO/CQ documentation, and 24/7 technical support.
📞 Hotline: 0917 991 589 (Hanoi) | 0932 226 100 (Ho Chi Minh City)
📧 Email: [email protected]
🌐 Website: https://aumi.com.vn/
Addresses:
- Hanoi: B44, Villa Area, Viet Hung Urban Area, Viet Hung Ward
- Ho Chi Minh City: 2nd Floor, HS Building, 260/11 Nguyen Thai Binh, Bay Hien Ward
- Da Nang: 9th Floor, PV Bank Building, No. 2 30-4 Street, Hoa Cuong Ward
