Shenzhen Espe Technology Co., Ltd, 401A, 501A502B Building 2, Hongxin Industrial Zone, Guanlan, Longhua, Shenzhen (2026)

04/06/2026

Shenzhen ESPE Explains the Working Principle of Safety Light Curtains

In the field of industrial automation, safety light curtains are crucial protective devices for ensuring personal safety. A correct understanding of their working principle is essential for equipment selection, installation, commissioning, and daily use. Below, we will provide a simple explanation of the working principle of safety light curtains.

A safety light curtain consists of two parts: a transmitter and a receiver.

1. Transmitter: Contains multiple equally spaced infrared emitting diodes that emit parallel beams of light towards the receiver.

2. Receiver: Contains the same number of equally spaced infrared receiving diodes to receive the beams of light from the transmitter.

In conventional parallel scanning mode, there is a one-to-one correspondence between the emitting and receiving diodes. When a receiving diode fails to receive a beam of light within the expected timeframe, the safety light curtain determines that the beam is blocked and outputs a signal to a PLC or other controller, or directly controls the equipment to stop operating, thereby achieving safety protection. http://www.espetech.com

02/06/2026

Application of SLR11 Series Safety Door Locks in the Lithium Battery Industry

In the lithium battery industry, robotic arms are widely used in high-intensity, high-precision production processes such as cell handling and module assembly. To ensure the safety of personnel and equipment, safety fences are typically installed around the robotic arms, forming independent working areas. However, frequent entry and exit for work and internal maintenance present a dual challenge to the access control management of these safety fences: preventing accidental equipment startup when the door is not closed, and preventing personnel from being accidentally locked inside during maintenance. The SLR11 series safety door locks offer a new safety upgrade solution to this problem.

Safety interlocking devices must meet safety circuit detection requirements and effectively monitor the door's opening and closing status. The robotic arm working area in lithium battery production workshops is equipped with safety fences. Due to the fast production pace and frequent personnel entry and exit, safety interlocking devices that cannot be easily disabled must be installed to ensure that equipment cannot start when the fence door is not closed. When personnel are performing maintenance inside the fence, it is also necessary to effectively prevent external personnel from accidentally closing the door.

The SLR11 series safety door lock, used in conjunction with a latch, ensures both locking force and effective prevention of personnel being accidentally locked inside the enclosure during maintenance. Employing RFID detection technology, the safety door lock features both mechanism locking and status monitoring, effectively monitoring the door's open/closed status. The door lock key utilizes a periodic dual-check mechanism, effectively preventing safety hazards caused by single-circuit failures and significantly improving overall system security.

This ensures production safety, preventing dangerous incidents caused by personnel misoperation or unclear door lock status, thus enhancing safety assurance. It meets the needs for equipment safety protection, reduces safety hazards, and complies with production safety standards.

Previously, enclosure door locks relied on ordinary bolts, often resulting in equipment starting before the door was properly closed. With the SLR11 series safety door lock, equipment cannot start if the door is not fully closed, eliminating concerns about accidental entry and potential danger. Maintenance personnel are no longer afraid of being locked inside. Furthermore, this safety door lock is extremely robust and durable, providing long-term, stable safety protection for the workshop. http://www.espetech.com

29/05/2026

ESR Series Safety Relay Modules: Meets ISO13849-1 PL e Level

With the widespread adoption of smart manufacturing and automated production lines, personnel safety, equipment safety, and production continuity have become the bottom line for enterprise operations. Accidental operation of emergency stop buttons, unlocked safety doors, and malfunctioning safety light curtains can all lead to serious safety accidents. The ESR series safety relay modules are designed to meet these stringent requirements, becoming a crucial component of the industrial safety protection system.

Developed strictly according to ISO13849-1 Category 4, PL e level, the ESR series safety relay modules can be directly applied to high-risk scenarios such as robots, machine tools, stamping equipment, packaging machinery, and automated production lines, providing the highest level of safety interlock protection for the equipment.

A wide range of models are available to accommodate various safety inputs; ESRN-3A1B-E: Dual NPN normally closed inputs, compatible with NPN safety light curtains and safety door locks; ESRP-3A1B-E: Dual PNP normally closed inputs, compatible with PNP safety light curtains and safety door locks; ESRS-3A1B-E: Dual-channel dry contact inputs, directly connecting to emergency stop buttons, safety door switches, and two-hand buttons.

Utilizing a 35mm standard DIN rail design, the compact size (100.6×114×22.5mm) allows for flexible installation, fitting into control cabinets, control boxes, and other confined spaces, and is compatible with mainstream industrial control environments.

The ESR series safety relay modules, with their high safety level, strong stability, and ease of maintenance, have become the preferred choice for many industrial enterprises. From standard design to detailed protection, from rapid response to long-term reliability, every design element revolves around the core concept of "safety," providing a solid and reliable safety guarantee for industrial automation. www.espetech.com

27/05/2026

What are the application areas of safety light curtain sensors?

A safety light curtain sensor is a safety protection device based on optical principles. It consists of a set of emitting beams and a set of receiving beams, forming a "light curtain" area. Any object that blocks or interrupts these beams will trigger an alarm or stop the machine to prevent accidents. So, what are the application areas of safety light curtains?

1. Manufacturing: Safety light curtain sensors are widely used in industrial equipment such as processing equipment, packaging machines, and assembly lines to protect operators and maintain production safety.

2. Automated Production Lines: In automated production lines, light curtain sensors are used to monitor machine operating status, ensuring that no personal injury or equipment damage occurs during production.

3. Logistics and Warehousing: In logistics conveyor systems and warehousing equipment, light curtain sensors can be used to monitor conveyor belts and robot working areas to prevent accidents.

4. Robotics: In industrial robot systems, safety light curtain sensors are used to prevent collisions between robots and operators during operation. www.espetech.com

21/05/2026

What are the main functions of a safety light curtain sensor?

A safety light curtain sensor is a safety protection device based on optical principles. It consists of a set of emitting beams and a set of receiving beams, forming a "light curtain" area. Any object that blocks or interrupts these beams will trigger an alarm or stop the machine to prevent accidents.

Main Functions of a Safety Light Curtain Sensor

1. Protecting Operators: The primary function is to protect operators from mechanical injury. The light curtain sensor can monitor the work area in real time. Once it detects personnel entering a hazardous area, the system will immediately take measures, such as stopping equipment operation, thereby preventing accidents.

2. Preventing Equipment Damage: By detecting abnormal conditions of equipment and tools, safety light curtain sensors can effectively prevent equipment damage due to improper operation or accidental collisions, thereby improving equipment lifespan and production efficiency.

3. Enhancing Production Safety: In automated production lines, safety light curtain sensors ensure the safety of equipment and the operating environment, making the production line operate more stably and reducing downtime and losses caused by accidents.

4. Compliance with safety standards: Many countries and regions have strict industrial safety standards and regulations. Safety light curtain sensors can help companies meet these standards and ensure compliance and safety in the production process. www.espetech.com

19/05/2026

What are normally closed and normally open safety light curtains?

A safety light curtain is an important device used to protect equipment and personnel. In the use of safety light curtains, normally closed and normally open are two common operating states, representing different functions and working principles.

A normally closed safety light curtain, as the name suggests, means that the safety light curtain is closed under normal circumstances. It only triggers a signal to stop the equipment when the light curtain is interrupted or blocked. Normally closed safety light curtains are generally used in situations requiring absolute safety, such as in high-risk areas or on automated production lines with extremely high personnel safety requirements. In this mode, the equipment can only operate normally through continuous beam scanning; if any abnormal situation occurs, the equipment will be stopped immediately, ensuring the safety of personnel and equipment.

Conversely, a normally open safety light curtain means that the safety light curtain is open under normal circumstances. It only triggers a signal to stop the equipment when the light curtain is interrupted or blocked. Normally open safety light curtains are generally used in situations requiring high efficiency, such as vending machines or fast-response production lines. In this mode, the equipment can remain operational continuously, only stopping when an abnormality is detected, minimizing wiring damage caused by accidental triggering.

In summary, the normally closed and normally open states of a safety light curtain are two settings based on its operating principles under different working conditions. Each is suitable for different situations, protecting equipment and personnel while ensuring the normal operation of the equipment. By selecting the appropriate operating mode for the safety light curtain to meet actual needs, work efficiency and safety can be maximized. www.espetech.com

14/05/2026

What are safety light curtain protection devices? --ESPE

Safety light curtain protection devices are common industrial safety equipment used to protect workers from potential hazards during the operation of machinery, especially in automated production lines and machining fields. They primarily work by emitting and receiving light beams to monitor and identify the presence or location of objects, thereby issuing a stop command to the equipment and ensuring personnel safety. The following are the main features and functions of safety light curtain protection devices:

1. Working Principle of Safety Light Curtains: Safety light curtain protection devices typically consist of a transmitter and a receiver, which operate using infrared light. The transmitter emits a light beam, and the receiver receives the light transmission. When the beam is blocked or interrupted by an object, the safety light curtain issues a stop command. This command, after being connected to the safety control circuit, drives the equipment to stop dangerous actions through safety relays/contaminators/solenoid valves/drivers, etc., to protect operators.

2. Application Areas of Safety Light Curtains: Automated Production Lines: Used to monitor and protect workers on automated production lines when they approach hazardous areas (e.g., robotic arms), stopping equipment and ensuring personal safety; Machining Equipment: Widely used on CNC machine tools and other equipment to prevent operators from being accidentally touched or pinched while the equipment is running.

3. Safety Functions of Safety Light Curtains: High Response Time: When the beam is blocked, the safety light curtain can immediately output a safety signal with a response time of less than 10ms; Different Resolution Detection: Depending on the selected product resolution, it can effectively detect fingers, palms, and arms, ensuring safe distance settings at different detection resolutions to prevent accidental injury to operators.

4. Design and Layout: Selectable: Allows selection of beam height and density according to specific application requirements; Easy Installation: Typically designed with a modular structure for easy installation and maintenance.

5. Technological Advancements: With the development of technology, safety light curtain protection devices are continuously improving in resolution, fast response, and anti-interference capabilities to adapt to the needs of more complex and high-speed industrial environments.

In summary, the EEP Safety Light Curtain protection device plays a crucial safety protection role in industrial production through its efficient beam detection technology, effectively preventing accidental injuries and improving workplace safety and production efficiency. www.espetech.com

12/05/2026

Solutions to Unstable Safety Light Curtain Beam Projection

Solving the problem of unstable safety light curtain beam projection requires meticulous troubleshooting and patient resolution. Here are some methods to address this issue:

1. Determine the maximum protection distance of the safety light curtain. This is fundamental to stable operation. Only with this foundation can we better conduct subsequent troubleshooting and adjustments.

2. Check if the light curtain transmitter and receiver are on the same horizontal line. If they are not, light refraction and scattering will occur, affecting the beam projection stability. In this case, we need to adjust the installation position of the light curtain to ensure the transmitter and receiver are on the same horizontal line.

3. Maintaining the cleanliness of the light curtain surface and surrounding environment is also crucial. Dust and other contaminants on the light curtain surface or in the surrounding environment will affect the normal propagation of light, thus impacting the beam projection stability. Therefore, we need to regularly clean the light curtain surface and surrounding environment to ensure cleanliness.

4. For machinery and equipment that experiences significant vibration, consider installing anti-vibration supports to reduce the impact of vibration on the beam projection stability. This effectively avoids instability in the light curtain beam due to vibration.

5. Choosing the right light curtain product is also crucial. Different usage environments and lighting conditions require different light curtain products. Using an inappropriate light curtain product can lead to instability in the light curtain beam. Therefore, when selecting a light curtain product, we need to fully consider factors such as the usage environment and lighting conditions.

6. Consider contacting the manufacturer or professional technicians for consultation or repair. They have extensive experience and professional skills and can help us solve various problems. www.espetech.com

07/05/2026

The Role and Importance of Safety Door Switch

In industrial production operations, safety door Switch play a crucial role, ensuring the safety of workers and equipment while complying with safety regulations. This article will discuss the function of Yipu safety door lock switches.

Yipu safety door lock switches are devices used to monitor and control the closed status of equipment safety doors. Their main functions are as follows:

1. Accident Prevention: Safety door locks ensure that safety doors in the work area remain closed while equipment is running. If a safety door is opened, the lock switch quickly cuts off the power, stopping the equipment and preventing accidents caused by worker misoperation or accidental entry into hazardous areas.

2. Providing Safety Assurance: Safety door locks ensure that safety doors cannot be easily opened when equipment is operating in hazardous conditions, effectively preventing workers from accessing hazardous areas while the equipment is running and ensuring personnel safety.

3. Compliance with Regulatory Requirements: Safety regulations in many countries and regions require necessary safety measures for equipment. The installation and use of safety door lock switches meet this requirement and contribute to compliant business operations. www.espetech.com

30/04/2026

Shenzhen ESPE Receives China’s First UL 61496 Certification for Type 4 Safety Light Curtain

From April 15 to 16, 2026, the 4th UL Solutions “Quality Chain Future” New Energy Industry Chain Conference was grandly held at the Kempinski Hotel Jinji Lake, Suzhou. The conference focused on the whole industry chain safety technologies, international standard certification, material innovation, and overseas compliance for new energy and AI data centers. It addressed core challenges including technical barriers for product export, system safety and reliability, insufficient supply chain resilience, and cross-border operational compliance, helping enterprises better serve the international market.

As a leading enterprise in China’s industrial safety sector, Shenzhen ESPE Technology Co., Ltd. was invited to this landmark industry event. At the conference, UL Solutions and Shenzhen ESPE held the Certificate Award Ceremony for China’s First UL 61496 Certification for Industrial Safety Light Curtains. The EFA Series blind‑spot‑free safety light curtains independently developed by Shenzhen ESPE Technology Co., Ltd. were officially granted UL certification. With outstanding technical strength, it has become China’s first Type 4 safety light curtain certified by UL.

UL certification is a statutory market access credential for North America and one of the most authoritative certification systems in global industrial safety. It imposes systematic and stringent requirements on electrical safety, functional safety, and full‑process quality management in production.Notably, the EFA Series has already passed multiple top international safety standards, including ISO 13849‑1 (Cat.4 / PL e), IEC 61508 (SIL 3), and IEC 61496‑1/-2 (Type 4), fully demonstrating Shenzhen ESPE’s profound technical accumulation and R&D capabilities in industrial safety.

As a highlighted star product at the conference, the EFA Series features a compact, sleek blind‑spot‑free design. It integrates core safety functions including EDM (External Device Monitoring), interlock reset, and intelligent blanking. It supports flexible parameter configuration via host computer and multiple installation methods, combining high adaptability, ease of use, and operational reliability. Providing globally compliant industrial safety products that meet international standards for manufacturing equipment worldwide, it has earned high praise and wide recognition from UL experts, domestic and international attendees, and professional customers.

The official grant of UL certification not only marks that Shenzhen ESPE’s R&D capabilities in industrial safety are fully aligned with international standards, but also represents its formal access to high‑end markets in North America and globally. It sets a new benchmark for Chinese industrial safety products to participate in global competition.

From technological breakthroughs to keeping pace with international standards, with one UL certificate,Shenzhen ESPE Technology Co., Ltd.demonstrates the confidence and strength of Chinese industrial safety products in global competition. With capabilities aligned with top international standards, ESPE lets the world recognize the depth and weight of China’s industrial safety technology. www.espetech.com

Shenzhen Espe Technology Co., Ltd

04/06/2026

02/06/2026

29/05/2026

27/05/2026

21/05/2026

19/05/2026

14/05/2026

12/05/2026

07/05/2026

30/04/2026

Address

Telephone

Website

Alerts

Contact The Business

Shortcuts

Share

Category