Principle of pressure resistant thermocouple

Explosion proof thermocouples are widely used in chemical automation systems, and they are temperature sensors. Voltage resistant thermocouples can convert the temperature parameters of the controlled object into electrical signals through temperature sensors, and send them to the display recording regulator for detection, adjustment, and control of the system. Chemical plants and production sites are accompanied by flammable and explosive chemical gases and vapors, and the use of ordinary thermocouples is very unsafe, which can easily cause environmental gas explosions. Therefore, these places must use pressure resistant thermocouples as temperature sensors. Our company's pressure resistant thermocouple products are suitable for places with explosive gas hazards within the d Ⅱ CT6 temperature group. Working principle: When a closed circuit is composed of two homogeneous conductors (thermoelectric electrodes) with different compositions, and 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). Voltage resistance principle: Using the gap voltage resistance principle, design terminal boxes and other components with sufficient strength. Use sparks, arcs, and seal all components that cause dangerous temperatures inside the terminal box. By extinguishing and cooling the gap between the joint surfaces when an explosion occurs in the cavity, the flame and temperature after the explosion cannot reach the outdoor level. Features: Adopting a double chamber pressure and explosion-proof structure designed in accordance with the latest international IEC standard GB3836, the temperature measuring element is easy to replace, and the safe and reliable pressure and explosion-proof mark dIICT6 is used, which is suitable for Temperature measurement below level II-C, flash temperature above T6, and containing explosive gases. Attention: The main technical parameters for power-off operation during maintenance are thermocouples, and the ambient temperature should be 20&plus Mn 15° The test voltage is 500 ± when the relative humidity is below 80%; The insulation resistance between the electrode (50V DC) and the outer sleeve is greater than; 1000Ω . m