Photoelectric Proximity Sensor GTB2S-N1331 SICK – Background Suppression, 36 mm, NPN, IP67
Overview:
The GTB2S-N1331 is a compact background suppression photoelectric proximity sensor from SICK’s G2 series. With a maximum sensing range of 36 mm, PinPoint red LED technology producing a Ø3 mm light spot, NPN output, and IP67 protection, it is ideal for reliable detection of small objects in high-speed automation, electronics, robotics, and packaging machinery.
Product Overview –Photoelectric Proximity Sensor GTB2S-N1331
The GTB2S-N1331 is a background suppression photoelectric proximity sensor in SICK’s G2 series. It operates on the principle of angular reflection analysis, reliably distinguishing the target object from the background regardless of color or surface reflectivity variations.
Thanks to the PinPoint red LED (640 nm) that generates a highly focused light spot of Ø 3 mm at 15 mm distance, the sensor delivers exceptional accuracy when detecting small components, fine wires, or object edges. Its ultra-compact housing (7.7 × 21.8 × 13.5 mm), response time of less than 0.6 ms, and switching frequency of 800 Hz make it perfectly suited for demanding high-speed industrial automation applications.
Key Features
- Maximum sensing range: 1–36 mm (90% remission)
- Light source: PinPoint red LED, 640 nm, light spot Ø 3 mm (at 15 mm)
- Output: NPN, max. output current ≤ 50 mA
- Protection: IP67, operating temperature –25°C to +50°C
- Connection: 3-wire PVC cable, 2 m length, with circuit protection A+C+D
Technical Specifications – GTB2S-N1331
| Parameter |
Value |
| Model |
GTB2S-N1331 |
| Part No. |
1062929 |
| Functional principle |
Photoelectric proximity sensor |
| Functional principle detail |
Background suppression |
| Dimensions (W × H × D) |
7.7 × 21.8 × 13.5 mm |
| Sensing range max. |
1 mm – 36 mm (90% remission) |
| Sensing range (standard) |
5 mm – 30 mm (6% remission) |
| Background suppression |
from 38 mm |
| Light source |
PinPoint red LED, 640 nm |
| Light spot size |
Ø 3 mm at 15 mm distance |
| Adjustment |
None (fixed) |
| Supply voltage (UB) |
10–30 VDC |
| Ripple |
< 5 Vpp |
| Current consumption |
20 mA (no load) |
| Output |
NPN |
| Switching mode |
Light switching |
| Output current max. |
≤ 50 mA |
| Response time |
< 0.6 ms (resistive load) |
| Switching frequency |
800 Hz (light/dark ratio 1:1) |
| Connection |
3-wire cable, 2 m length |
| Housing material |
Plastic (ABS) |
| Optics material |
Plastic (PMMA) |
| Weight |
33.7 g |
| Enclosure rating |
IP67 |
| Ambient operating temperature |
–25°C … +50°C |
| Ambient storage temperature |
–40°C … +75°C |
| Circuit protection |
A (reverse polarity) + C (interference suppression) + D (output short-circuit protection) |
| Certifications |
EU/UK/ACMA/Morocco CoC, China RoHS, cULus, DIN EN 62471 |
Source: Official SICK Datasheet GTB2S-N1331. Download datasheet PDF
Applications of the GTB2S-N1331 in Industry
- Electronics & Semiconductor: The extremely small PinPoint light spot (Ø 3 mm at 15 mm) enables precise detection of SMD components, ICs, fine wires, and PCB features while avoiding false triggers from surrounding objects on high-speed assembly lines.
- Packaging & Printing: With an 800 Hz switching frequency and < 0.6 ms response time, the sensor reliably detects labels, sheets, or thin films. Background suppression from 38 mm eliminates interference from conveyors or machine surfaces.
- Automotive & Mechanical Assembly: Fixed sensing range (no adjustment required) allows fast deployment in inspection jigs for small machined parts, bolts, and bearings.
- Robotics & Automation: Ultra-compact size and low weight (33.7 g) enable direct mounting on robot grippers or end-of-arm tooling without affecting motion range.
- Pharmaceutical & Food Industry: IP67 rating and wide operating temperature range make it suitable for cleanroom environments and food processing lines with strict hygiene requirements.
Comparison: GTB2S-N1331 vs GTB2S-N1451
The G2 series from SICK offers multiple sensing range variants. Both the GTB2S-N1331 and GTB2S-N1451 use background suppression technology but differ in range and adjustability:
| Parameter |
GTB2S-N1331 |
GTB2S-N1451 |
| Part No. |
1062929 |
1060203 |
| Sensing range max. |
1–36 mm (90% remission) |
2–120 mm (90% remission) |
| Sensing range (6% remission) |
5–30 mm |
25–90 mm |
| Adjustment |
None (Fixed) |
3-turn potentiometer |
| Light spot size |
Ø 3 mm (at 15 mm) |
Ø 3.5 mm (at 50 mm) |
| Dimensions (W×H×D) |
7.7 × 21.8 × 13.5 mm |
7.7 × 27.5 × 13.5 mm |
| Weight |
33.7 g |
34.2 g |
| Output / Protection |
NPN / IP67 |
NPN / IP67 |
Conclusion:
- Choose the GTB2S-N1331 for short-range applications (≤36 mm), fixed installation without adjustment, and high-precision small object detection.
- Choose the GTB2S-N1451 for longer-range needs (≤120 mm) with flexible distance adjustment via potentiometer.
Frequently Asked Questions (FAQ)
Q1. What is the GTB2S-N1331?
The GTB2S-N1331 is a background suppression photoelectric proximity sensor from SICK. It uses PinPoint red LED technology for precise detection of small objects up to 36 mm.
Q2. Does the GTB2S-N1331 have NPN or PNP output?
The GTB2S-N1331 features NPN output in a 3-wire configuration and operates on 10–30 VDC.
Q3. What applications is the GTB2S-N1331 suitable for?
It is ideal for electronics assembly machines, robot pick-and-place systems, high-speed packaging lines, and small parts detection applications.
Q4. Is the GTB2S-N1331 waterproof?
Yes. The sensor has an IP67 rating, providing excellent protection against dust and water in industrial environments.
Q5. What models can replace the GTB2S-N1331?
It can be replaced by the GTB2S-N1451 when a longer sensing range with adjustment is required, or by the GTB2S-P1331 when a PNP output is needed.
Contact for Purchasing Photoelectric Sensor GTB2S-N1331
AUMI – Official authorized distributor of SICK 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 Tower, No. 2 30-4 Road, Hoa Cuong Ward
