1、 The function and working principle of thermocouple isolation safety barrier:

1. Thermocouple safety barrier is a safety device used to protect thermocouple measurement systems. Its main function is to prevent equipment damage or personnel injury caused by electrical faults, overloads, or short circuits during thermocouple measurement. By installing thermocouple safety barriers, thermocouples can be effectively isolated from potential hazards, ensuring the stability and reliability of the measurement system.

The working principle of thermocouple safety barriers is based on electrical isolation and current limiting protection. It amplifies and converts the weak electrical signals generated by the thermocouple by introducing an isolation circuit between the thermocouple and the measurement system, while limiting the magnitude of the current to prevent electrical faults from causing damage to the measurement system. The thermocouple safety barrier also has overload protection and short circuit protection functions, which can timely cut off the circuit in abnormal situations and protect the equipment from damage.

3. Thermocouple isolation safety barriers also have the following characteristics and advantages:

• Electrical isolation: It adopts a circuit structure that electrically isolates the input, output, and power supply from each other. This isolation method does not require a system grounding line, which brings great convenience to design and on-site construction. ‌
• Signal stability: As the signal lines do not require a common ground, the stability and anti-interference ability of the detection and control circuit signals are greatly enhanced, thereby improving the reliability of the entire system. ‌
• Extensive signal processing capabilities: With stronger input signal processing capabilities, it can accept and process signals such as thermocouples, thermistors, frequencies, etc., which cannot be achieved by Zener safety barriers. ‌
• Output isolation signal: It can output two mutually isolated signals to provide to two devices using the same signal source, ensuring that the signals of the two devices do not interfere with each other and improving the electrical safety insulation performance between the connected devices

2、 Application of LYA-R thermocouple isolation safety barrier:

The LYA-R thermocouple isolation safety barrier is mainly used to limit the entry of hazardous energy into hazardous areas, prevent electrical interference by isolating electrical signals, ensure equipment and personnel safety, and enhance equipment reliability. The isolation safety barrier outputs single or independent dual current/voltage signals from the danger zone to the safety zone through an isolation transformer, and can also be connected to the safety zone through a configured communication interface for serial communication networking. It is an intelligent safety barrier product, and users can set the input signal type and output range of the product through a dedicated programmer or computer. This type of equipment is widely used in industries such as chemical, petroleum, natural gas, and electricity, and is also used in many flammable and explosive work sites.

3、 Technical parameters of thermocouple isolation safety barrier:

1. Input signal: thermocouple signal

2. Output load: ≤ 5500 when 4-20mA, voltage type ≥ 250K Ω

3. Basic error: ± 0.2% FS

4. Explosion proof mark: [Exia] IIC

5. Power supply: 24VDC ± 5%

6. Temperature drift: ≤ 0.01% FS/℃

7. Insulation resistance: ≥ 100M Ω/500VDC between power supply input output

8. Insulation strength: 1000VAC/min

9. Power consumption: One in one out<1.4W, one in two out<2W

10. Working environment: ambient temperature of 0-50 ℃; Relative humidity ≤ 85% RH (avoid strong corrosive gases)

11. Installation method: Rear mounted card (DIN35 rail)

4、 Quality Assurance:

Thank you for your attention and use of Lingyu Technology's products. Our company promises to provide a 24 month warranty service for this product. If any quality problems occur during the warranty period, the product will be repaired or replaced free of charge.