Get in touch with QJKH Company
Global Manufacturing Standard
Industrial Safety Sensors
& Machine Guarding Solutions
QJKH is a manufacturer of industrial safety sensors designed specifically for machine guarding and operator safety. Our safety light curtains, laser scanners, LiDAR sensors and safety relay modules protect production lines in over 50 countries – all CE/TV approved, all factory direct from our Hangzhou manufacturing base. From finger-detection light curtains for press machining to programmable laser scanners for AGV fleets, one factory can supply your complete machine safety sensor system.
20+
Years in Sensors
4
Product Lines
50+
Countries Served
CE/TÜV
Certified
Selection Guide
Safety Sensor Technology Quick-Select Guide
Select the right safety sensor technology for your machine guarding application
| Technology | Detection Method | Best For | Safety Rating | Range | Response |
|---|---|---|---|---|---|
| Safety Light Curtain | Infrared beam array | Point-of-operation guarding | SIL3 / PLe (Type 4) | ≤ 20 m | ≤ 14 ms |
| Safety Laser Scanner | TOF laser pulse | Area & perimeter monitoring | SIL2 / PLd (Type 3) | ≤ 5.5 m safety | ≤ 80 ms |
| LiDAR Sensor | TOF / solid-state | Navigation & anti-collision | Application-specific | ≤ 120 m | Varies |
| Safety Relay Module | OSSD signal processing | Safety circuit integration | SIL3 / PLe | N/A | < 20 ms |
Safety Light Curtains — ENT Series
The ENT Series safety light curtains generate an invisible array of infrared beams that sense the presence of hands, arms or a body in a work zone – immediately stopping machinery to prevent injury. Available as Type4 (SIL3/PLe) and Type2 (SIL2/PLc) configurations for high- and medium-risk applications.
- Resolution: 14 mm (finger) · 30 mm (hand) · 40 mm (body)
- Protective height: 160 mm – 1,827 mm
- Response time: ≤ 14 ms
- Protection rating: IP65 · Operating temp: -10°C to +55°C
- Functions: Muting · Blanking · EDM · Restart interlock
Safety Laser Scanners — SH Series
SH Series safety laser scanners use time-of-flight measurement to monitor 2D configurable safety or warning zones. These sensors sense humans approaching AGVs, robotic work cells and open perimeter protected zones to enable both static zone guarding and dynamic AGV protection according to ENISO3691-4.
- Scanning angle: 270° field of view
- Safety zone: up to 5.5m · Warning zone: up to 20m
- Safety rating: SIL2 / PLd (Type 3)
- Configurable zone sets for multi-application flexibility
- Ethernet connectivity · Diagnostic monitoring
LiDAR Sensors — YB Series
YB Series industrial LiDAR sensors collect highly-accurate distance data for AGV navigation, overhead crane anti-collision systems and robotic obstacle avoidance. Choose from solid state (no moving parts), 2D TOF and 3D point cloud configurations, all designed for continuous industrial duty.
- Solid-state LiDAR: no rotating parts · CE/UL certified
- 2D LiDAR: TOF measurement · up to 80 m range
- 3D LiDAR: 360 point cloud out to 120m
- Applications: AGV/AMR navigation · Crane anti-collision · Robotics
Safety Relay Modules
These safety relay modules interpret OSSD (Output Signal Switching Device) signals from safety light curtains, laser scanners, emergency stop buttons and safety mats to complete safety circuit configurations for machine safe guarding. Easy wiring, DIN rail installation.
- OSSD signal processing: SIL3 / PLe rated
- Compatible: light curtains · scanners · e-stops · safety mats
- Response time: < 20 ms
- DIN rail mounted · LED indicators · Manual or auto reset
Safety Standards
Industry-Specific Safety Solutions
Every factory environment calls for safety systems tailored to the specific hazards. Preventing industrial accidents caused by unguarded machines is a primary safety standard. Our sensor configurations are bespoke to your factory, delivering the safety performance required to meet your code compliance regulatory standards while operating at your press pace.
Press & Stamping Machine Safety
14mm resolution Type4 safety light curtains deliver finger detection for hydraulic presses and high performance punch machining – protecting operators during the high-risk operation. Manual or automatic reset. Enabling the manufacturer to produce millions of high-performance components each year.
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Packaging & Palletizing Line Safety
Muting safety light curtains enable autonomous operation for longer conveyor and palletizing lines delivering automated pass-through of product without risking operator breach. Muting function uses dedicated external sensors in conjunction with the main safety sensor to differentiate between product and personnel, protecting operators working near the unguarded work zone without interrupting production.
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AGV & Mobile Robot Safety
Integrating multiple safety sensors offers optimum operational efficiency. Laser scanners provide real-time person detection around dynamically laden AGVs, while LiDAR sensors enable autonomous navigation and obstacle avoidance by detecting surrounding objects in 3D –meeting ENISO3691-4 best practice.
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Robot Cell & Workstation Safety
Access to the robot cell through safety light curtains, perimeter monitoring of the danger zone by area scanners. Selectable safety zones adapt your safety protection for different production modes. – switching between setup, run, and maintenance – without changing hardware or stopping the process.
Learn More →Competitive Edge
Why Choose QJKH
Factory Direct Advantage
Most Safety sensors from other suppliers are simply re-sold from several brands without any advanced knowledge in the technical implementation. We design, produce and certify our own sensing products directly. Instead of choosing to source other manufacturer’s parts, our customers reach their end-goals faster and with less risk when using our safety sensing products. Our application engineers support the customer during the time-from initial job speculation/ risk analysis consultation, installation, to continual service of the safety equipment on industrial machines.
20+ Years Safety Expertise
Since 2003, the engineering department has been designing industrial safety sensors/controllers for operation since 2003 with great expertise in the realms of photoelectric sensors, laser measurement sensors, and safety circuit design. Our technical experience guides every product we manufacture.
Complete Product Ecosystem
From a single factory, four product lines ship direct: light curtains, laser based protective area scanners, LiDAR sensors for navigation and collision avoidance, and safety relay modules for processing electrical OSSD signals. Ordering all at one location. Simplify your supply chain.
CE/TÜV/SIL3 Certified
All our safety-critical sensor products are independently tested and certified by accredited third-party laboratories. Our Type4 photoelectric safety light curtains are rated at SIL3/PLe – our highest standard available on IEC61508.
OEM & Custom Manufacturing
Private labelling, custom housing dimensions, use alternative beam spacings, design application-specific firmware. Our engineers work directly with your specifications.
Factory Direct Pricing
Directly from factory in Hangzhou Airport Economic Zone, no distributors, no “middle-men” markups. Competitive MOQs applicable for importers and OEM customers.
Free Sample Program
Test our sensors directly on your application. Request evaluation samples to determine the best products for your machinery environment and installation layout.
Quality Assurance
Certifications & Quality Assurance
All of QJKH safety sensors are independently certified by third-party testing facilities according to international safety standards. Our Type4 safety light curtains achieve SIL3/PLe and our safety laser scanners are rated SIL2/PLd. All units are tested at our factory before shipment including optical accuracy, response time, OSSD output validation, thermal trials, vibration trials, humidity trials and aging trials. We maintain full manufacturing traceability form component selection through final calibration to guarantee the situation performance of each safety device exceeds the stated certification.
CE
TÜV
SIL3
PLe
IEC 61496
ISO 13849
CLOSE
Q.
What types of safety sensors does QJKH manufacture?
A.
Four product categories: safety light curtains in Type 2 and Type 4 configurations (ENT Series, with muting, waterproof, and elevator variants), safety laser scanners for area and AGV protection (SH Series), industrial LiDAR sensors covering 2D, 3D, and solid-state technologies for navigation and anti-collision (YB Series), and safety relay modules for OSSD signal processing. Every product is designed, assembled, and tested at our Hangzhou factory — not sourced from third-party OEMs.
Q.
What certifications do your safety sensors carry?
A.
Our Type4 safety light curtains are CE and TV certificated and reach SIL3 (IEC62061) and Performance Level e (ISO13849). They meet the relevant IEC61496-1 and IEC61496-2 electro-sensitive photographic equipment standards (ESPE). Our safety laser scanners meet IEC61496-3 Type3. All LiDAR sensors are CE, UL certified.
Q.
Do you offer OEM and custom safety sensor solutions?
A.
Yes — private labeling, custom housings, modified beam spacing, and application-specific firmware are all available. Learn more about OEM capabilities.
Q.
What is the difference between a safety light curtain and a safety laser scanner?
A.
Safety light curtains utilising infrared beam arrays respond to intrusion by breaking the beam plane- they operate using IEC61496 Type2, 4 beams to safely achieve up to SIL3/ PLe. Opaque objects are detected at fixed mounting locations best suited for Point-of-Operation employee protection. Safety laser scanners employing Time-of-Flight laser pulses utilise 2D image detection to measure a monitored array— IEC/IS0 61496 Type3 laser scanners to safely contain to SIL2/PLd. They excel at flexible perimeter and area scanning, mobile AGV applications in the factory setting. See the above performance comparison table.
Q.
How do I request a quote or free sample?
A.
Click “Get a Free Quote” to submit your requirements, or contact us directly. For evaluation samples, specify your application, required safety level, and mounting environment. We ship test units globally and provide technical support throughout your evaluation process.
Our Engineering Perspective on Machine Safety
Since our inception in Hangzhou the QJKH engineering team has been researching, developing and manufacturing safety light curtains, laser scanners and LiDAR sensors. The specification sheet herein is representative of our current device offering and industry standard functional ranges. All safety categories or SIL/PL ratings adhere to IEC61496 or ISO13849 third-party testing approval, and we consult with customers free of charge for application aligned safety distance calculations in our quotation process.
Initiate Project
Ready to Safeguard Your Production Line?
Tell us about your machine guarding needs, and our dedicated safety and application engineers will advise the right sensor connection configuration for your machinery— and arrange any necessary evaluation samples free of charge.
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