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No matter how complex the background is, the target remains clear.
P20 series background suppression photoelectric sensor
Using laser triangulation and BGS background suppression technology, it achieves stable target detection without being affected by background distance.
Everyone in automation knows that photoelectric sensors are the “eyes” of the production line. But these eyes often suffer from “selective blindness.”
Accuracy distortion — changes in the color of objects behind the target cause signal drift; the object has not reached position, but the system thinks it has.
Color-related misjudgment — dark objects absorb light and “disappear,” while light-colored objects reflect too much light and become overexposed. The same batch of goods can produce completely different detection results.
Installation limitations — space is narrow, standard sensors do not fit, and through-beam solutions require reflectors on the opposite side, creating wiring conflicts.
Slow response — when a high-speed line runs at 300 pieces per minute, sensors cannot keep up, causing missed and false detections.
If your production line is troubled by these problems, it is time to change to a smarter pair of eyes.
22 mm × 31.5 mm × 12 mm — smaller than a finger joint and light enough to hold between two fingers.
But do not be misled by its size. Inside this tiny body is a complete laser triangulation distance measurement system.
The scarcest resource on industrial sites is not sensors — it is installation space.
With its ultra-compact body, KJT-BGS20 easily fits into robot joints, miniature conveyors, dense workstations, and narrow gaps. Single-side installation requires no through-beam reflector. M3 screw holes make mounting stable immediately. A 2 m bend-resistant cable routes easily without wiring interference.
From now on, installation location is no longer a compromise.
Traditional diffuse-reflective photoelectric sensors have a critical weakness: they determine target presence based on reflected light intensity.
This means the target color, surface reflectivity, and background brightness can all interfere with judgment.
KJT-BGS20 uses BGS, or Background Suppression, technology based on laser triangulation. It directly calculates the distance between the sensor and the target.
Simply put, it creates an “alarm line” within a set distance. Targets inside the line are accurately detected regardless of whether they are black, white, or colored. Backgrounds outside the line, even a shiny metal wall, are ignored.
Recognize the target, not the background. This is not a parameter adjustment — it is a revolution in detection logic.
We conducted an extreme test: placing a black rubber block with about 5% reflectivity and a white plastic block with about 90% reflectivity at the same distance for KJT-BGS20 detection.
The result?
Traditional diffuse-reflective sensors: detection distance for black objects drops by more than 50%, almost causing blindness; white objects trigger falsely due to overexposure.
KJT-BGS20: detection distance deviation between black and white objects is less than 2%, with stable signal output.
Black, white, colored, mirror-like, matte — in its logic, there are only two states: within detection distance or outside detection distance. Color is never the judgment standard.
Color-independent: black, white, colored, and reflective surfaces maintain stable detection distance. Say goodbye to the industry pain point of failure on black objects, and change material batches without recalibration.
High-frequency response: 300 Hz response frequency with millisecond-level switching action. On high-speed production lines, even targets that flash past can be captured accurately, without missed detection or lost rhythm.
BGS background suppression: intelligently identifies background distance, reducing false triggering close to zero. Rear conveyor belts, metal brackets, and white walls are all shielded, keeping the focus only on the target.
Ready to install and use: mechanical five-turn distance adjuster, NPN/PNP dual output compatibility, no complicated setup. Deployment can be completed in 30 minutes, with extremely low maintenance cost and an engineer-friendly design philosophy.
Parameters are the language of engineers and the confidence of a product.
Detection distance: 5–2000 mm, based on white matte paper
Setting range: 25–200 mm, covering most industrial detection scenarios
Repeatability: ≤1 mm along the detection axis, ≤0.2 mm on the vertical axis, enabling accurate positioning even on tiny object edges
Response frequency: 300 Hz, zero missed detection in high-speed conditions
Operating voltage: 12–24 V DC ±10%, compatible with mainstream industrial power supplies
Output mode: NPN/PNP dual compatible, direct PLC connection without conversion module
Protection rating: IP64, dustproof and splash-resistant, reliable in oil mist and dust environments
Ambient light resistance: 3000 LUX, stable under strong indoor lighting
Operating temperature: -25°C to +55°C, wide temperature adaptability
Dimensions: 22 mm × 31.5 mm × 12 mm, ultra-compact
Cable: φ3.7 mm bend-resistant cable, 3-core, 2 m long, resistant to bending and pulling
Every parameter is designed for certainty in industrial sites.
Inside the small body is a smart brain.
KJT-BGS20 integrates a high-performance processing chip, precision optical lens array, and high-sensitivity receiver. The 650 nm modulated laser is reflected by the target, and the receiver captures changes in light spot position. Through triangulation algorithms, it performs real-time calculation and directly outputs the distance judgment result.
Its data performance is impressive:
Background interference resistance: 95.92%
Black-white detection consistency: 98.31%
Distance measurement accuracy, vertical axis: ±0.2 mm
It is not reflected light intensity, but physical distance. This change in underlying logic allows KJT-BGS20 to fundamentally break free from color, material, and reflectivity limitations, providing a strong hardware foundation for precise sensing and intelligent decision-making.
Industrial sites are not laboratories. Dust, oil mist, vibration, and incorrect wiring — any one of these can make ordinary sensors stop working.
KJT-BGS20 is designed for harsh conditions from the beginning:
IP64 protection prevents foreign objects and dust from entering, while also resisting water splashes from all directions. Machine tool cutting fluid, food workshop water vapor, and textile fiber dust are part of its everyday working environment.
Short-circuit protection plus automatic anti-interference: when the output wire is accidentally shorted, protection cuts in automatically. When multiple sensors are installed closely together, modulation frequencies are automatically staggered to avoid crosstalk.
Vibration and impact resistance: passes 10–500 Hz vibration testing with 3 mm double amplitude, and 500 m/s² impact testing. Stamping machines, heavy conveyors, mobile platforms — the optical axis stays aligned and parameters remain unchanged.
Dual LED status indication: green power indicator confirms power, and red output indicator shows detection status. Troubleshooting takes only two steps, reducing downtime from 15 minutes to 2 minutes.
24/7 stable operation is not a slogan. It is built into the structure.
No matter what color or material the target is, and no matter what background lies behind it, as long as the target is within the detection distance, KJT-BGS20 gives one clear answer.
Logistics sorting: mixed black, white, and colored packages on conveyor belts are accurately identified, with zero interference from rear metal brackets.
Packaging machinery: transparent bottles, black caps, and reflective aluminum foil packaging — color and material are no longer detection barriers.
Electronics manufacturing: 0.5 mm thick black rubber gaskets and dark PCB boards are precisely positioned with a small light spot, preventing missed detection of tiny components.
Automotive assembly: black sealing strips, painted metal parts, and mirror-finish decorative panels are detected stably, ensuring assembly rhythm.
Circuit board detection: complex green PCB surface colors are captured precisely without being affected by board color variations.
Metal sheet detection: thick and thin sheets are both accurately identified; painted metal and mirror-reflective sheets output stably in complex environments.
Hard disk metal components: precision metal disks and magnetic head assemblies are detected in position, unaffected by background color.
These are only the beginning. From transparent glass to matte rubber, from mirror metal to dark PCBs, one technology covers all materials. One sensor ends selection anxiety.
From BGS background suppression to laser triangulation, from a 22 mm compact body to 300 Hz high-speed response, every design of KJT-BGS20 answers the same question: how can industrial detection become simpler, more reliable, and less restricted?
