Exia IIC
Fast fuses, current limiting resistors, or voltage limiting diodes are used in the circuit to limit the input electrical energy and ensure the energy output to the hazardous area.

1. The installation location must have a very reliable grounding system, which is obviously a very demanding requirement and difficult to guarantee in practical engineering applications.

3. Zener safety barriers have a significant impact on the power supply and are also prone to damage due to fluctuations in the power supply.

4. Due to the circuit principle of the Zener safety barrier requiring absorption of energy from the input circuit, it is prone to output instability.

Isolated safety barrier
Adopting a circuit structure that electrically isolates the input, output, and power supply from each other, while complying with the requirements of intrinsic safety energy limitation. Compared with Zener safety, although it is more expensive, its outstanding performance advantages bring greater benefits to user applications:

Due to the use of a three party isolation method, there is no need for a system grounding line, which greatly facilitates design and on-site construction.

2. The requirements for instruments in hazardous areas have been significantly reduced, and there is no need to use isolated instruments on site.

3. 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.

4. Isolated safety barriers have stronger input signal processing capabilities and can accept and process signals such as thermocouples, thermistors, frequencies, etc., which cannot be achieved by Zener safety barriers.

5. The isolated safety barrier can output two signals that are mutually isolated, providing them 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.

Therefore, after comparing the characteristics and performance of Zener and isolated safety barriers, it can be seen that isolated safety barriers have outstanding advantages and a wider range of uses. Although their price is slightly higher than Zener safety barriers, their overall cost may be lower than Zener safety barriers in terms of design, construction, installation, commissioning, and maintenance costs. Isolation safety barriers are almost universally used as the main intrinsic safety explosion-proof instruments in engineering sites with high requirements. Isolation safety barriers have gradually replaced Zener safety barriers and have been increasingly widely used in the field of safety and explosion-proof