Proximity Photoelectric Sensor GTB2S-N1451 SICK 120 mm NPN IP67
Overview:
The GTB2S-N1451 from SICK is a background suppression photoelectric proximity sensor from the G2 series, offering a maximum sensing range of 120 mm. It features NPN output, PinPoint red LED technology at 640 nm with a precise small light spot (Ø 3.5 mm at 50 mm), and 3-turn potentiometer adjustment for flexible setup. With its ultra-compact dimensions of 7.7 × 27.5 × 13.5 mm, IP67 protection, and wide operating temperature range, the sensor is ideal for packaging lines, logistics, industrial robots, and high-reliability automation systems.
Product Overview of the Proximity Photoelectric Sensor GTB2S-N1451
The GTB2S-N1451 is a background suppression photoelectric sensor from SICK. It operates on the background suppression principle, which eliminates the influence of the background behind the target object. This delivers highly stable detection even when the background color or reflectivity varies. The sensor is optimized for medium-range detection (up to 120 mm with 90% remission objects) and performs exceptionally well in industrial environments with background interference.
The PinPoint red LED (640 nm) produces a highly focused light spot, enabling precise detection of small objects or items with complex shapes. The 3-turn potentiometer allows easy on-site adjustment of the sensing distance without special tools. Its compact design, lightweight construction, and IP67 rating make it easy to integrate into modern automation systems.
Key Features:
- Maximum sensing range: 2–120 mm (90% remission)
- Light source: PinPoint red LED, 640 nm, light spot Ø 3.5 mm (at 50 mm)
- Adjustment: 3-turn potentiometer
- Output: NPN, max. output current ≤ 50 mA, IP67 protection
- Connection: 3-wire PVC cable, 2 m length, with circuit protection A+C+D
Technical Specifications – GTB2S-N1451
| Parameter |
Value |
| Model |
GTB2S-N1451 |
| Part No. |
1060203 |
| Functional principle |
Photoelectric proximity sensor |
| Functional principle detail |
Background suppression |
| Dimensions (W × H × D) |
7.7 × 27.5 × 13.5 mm |
| Sensing range max. |
2 mm – 120 mm (90% remission) |
| Sensing range (standard) |
25 mm – 90 mm (6% remission) |
| Light source |
Visible red light (PinPoint LED), 640 nm |
| Light spot size |
Ø 3.5 mm at 50 mm |
| Adjustment |
3-turn, potentiometer |
| 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 |
< 0.6 ms (resistive load) |
| Switching frequency |
800 Hz (light/dark ratio 1:1) |
| Connection type |
3-wire cable, 2 m |
| Housing material |
Plastic (ABS) |
| Optics material |
Plastic (PMMA) |
| Weight |
34.2 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/overcurrent protection) |
| Certifications |
EU/UK/ACMA/Morocco CoC, China RoHS, cULus, DIN EN 62471 |
Source: SICK Datasheet GTB2S-N1451. Download datasheet PDF
Applications of the GTB2S-N1451 in Industry
- Packaging & Food Production Lines: The 120 mm sensing range and potentiometer adjustment allow flexible setup for different products and packaging types. The 800 Hz switching frequency ensures reliable detection of fast-moving goods on conveyors.
- Logistics & Sorting Systems: The maximum 120 mm range is suitable for monitoring pallets, cartons, and packages on automated sorting conveyors. Background suppression eliminates interference from conveyor structures.
- Automotive & Mechanical Assembly Lines: The 3-turn potentiometer enables quick fine-tuning of the sensing distance for different parts on test fixtures without repositioning the sensor.
- Robotics and Automation Equipment: The compact size (7.7 × 27.5 × 13.5 mm) and low weight (34.2 g) allow easy integration into robot end-effectors or robotic arms in space-constrained applications.
- Pharmaceutical & Chemical Industries: IP67 rating protects against dust and water splash in cleanroom environments. The wide temperature range (–25°C to +50°C) supports diverse operating conditions.
Comparison: GTB2S-N1451 vs GTB2S-N1331
Both models belong to SICK’s G2 series but are designed for different sensing ranges:
| Parameter |
GTB2S-N1451 |
GTB2S-N1331 |
| Part No. |
1060203 |
1062929 |
| Sensing range max. |
2-120 mm (90% remission) |
1-36 mm (90% remission) |
| Sensing range (6% remission) |
25–90 mm |
5–30 mm |
| Adjustment |
3-turn potentiometer |
None (fixed) |
| Light spot size |
Ø 3.5 mm (at 50 mm) |
Ø 3 mm (at 15 mm) |
| Dimensions (W×H×D) |
7.7×27.5×13.5 mm |
7.7×21.8×13.5 mm |
| Weight |
34.2 g |
33.7 g |
| Output / Protection |
NPN / IP67 |
NPN / IP67 |
Conclusion:
- Choose the GTB2S-N1451 when medium-range detection (≤120 mm) and on-site potentiometer adjustment are required.
- Choose the GTB2S-N1331 for short-range detection (≤36 mm), fixed installation, and highly accurate detection of very small objects.
Frequently Asked Questions (FAQ)
Q1. What type of output does the GTB2S-N1451 have?
The GTB2S-N1451 features an NPN output, compatible with most PLCs and industrial control systems.
Q2. What is the maximum sensing range of the GTB2S-N1451?
The sensor offers a maximum sensing range of 120 mm for objects with 90% remission.
Q3. Can the sensing distance of the GTB2S-N1451 be adjusted?
Yes. The model includes a 3-turn potentiometer for direct on-sensor adjustment of the sensing distance.
Q4. What applications is the GTB2S-N1451 suitable for?
It is ideal for conveyors, packaging machines, logistics systems, industrial robots, and automation applications requiring stable object detection.
Q5. Can the GTB2S-N1451 replace the GTB2S-N1331?
Yes, if a longer sensing range is required (120 mm vs 36 mm). However, direct replacement is not always recommended because the GTB2S-N1451 is larger (27.5 mm vs 21.8 mm) and includes a potentiometer adjustment, which may shift in high-vibration environments.
The GTB2S-N1451 is better suited for applications requiring flexible adjustment, while the GTB2S-N1331 is more suitable for fixed installation, short-range sensing, and compact spaces.
Contact for Purchasing the Proximity Photoelectric Sensor GTB2S-N1451
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 Lot, 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
