Detailed Introduction to Explosion proof Thermocouples
The ZN series explosion-proof thermocouple for industrial use is a temperature sensor widely used in chemical industry automation systems. Through temperature sensors, explosion-proof thermocouples can convert the temperature parameters of the controlled object into electrical signals and transmit them to display instruments, recorders, and regulators to detect, adjust, and control the system.

In chemical plants, various flammable and explosive chemical gases are often present on the production site. Using ordinary thermocouples is very unsafe and can easily cause environmental gas explosions. Therefore, explosion-proof thermocouples must be used as temperature measuring instruments in these situations. Our company's explosion-proof thermocouple products are suitable for use in places with explosive gas hazards within the EXd Ⅱ CT6 temperature group range.
Working principle of explosion-proof thermocouple:
If an explosion-proof thermocouple is composed of two homogeneous conductors (thermoelectric electrodes) with different compositions in a closed circuit, when there is a temperature gradient at both ends, current flows through the circuit, and there is a thermoelectric potential between the two ends (as shown in the figure below)

Explosion proof principle of explosion-proof thermocouple:
Explosion proof thermocouples utilize the principle of gap explosion-proof to design junction boxes and other components with sufficient strength. All components that can generate sparks, arcs, and dangerous temperatures are sealed inside the junction box. When an explosion occurs inside the chamber, it can be extinguished and cooled through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the chamber.

Characteristics of explosion-proof thermocouple:
Design according to the latest explosion-proof regulations GB3836 that comply with international IEC standards;
Adopting a two chamber explosion-proof structure, it is easy to replace temperature measuring elements and safe and reliable to use
Explosion proof mark EXd Ⅱ CT6, suitable for temperature measurement in environments with Class IIC or below, ignition temperature T6 or above, and containing explosive gases.

Selection method for explosion-proof thermocouple:

Thermal resistance K-type thermocouple, bimetallic thermometer, electromagnetic flowmeter, pressure transmitter, flow transmitter, explosion-proof thermocouple, pressure spring thermocouple