Armored Explosion Proof Thermocouples Suitable for Measurements with Explosive Gases

Armored anti-explosion thermocouples are high-temperature precious metal thermocouples. Thermocouples are all temperature measuring instruments manufactured using physics principles. The main characteristic of platinum-rhodium thermocouples is high temperature resistance. Armored anti-explosive thermocouple physical and mechanical properties are generally used to compensate for the insulation and sheathing of the physical properties and aging performance should meet the requirements. Moisture-proof performance The heat-resisting compensating conductor shall withstand an ambient temperature of 40±2°C and a relative humidity of 95±3%. After a 24-hour moisture-proof performance test, the armored anti-explosive thermocouple compensating conductor between the core and the core and the shielding layer The insulation resistance is not less than 25mΩ per meter.

Armored explosion-proof thermocouples shall withstand a 24-hour heat resistance test at 220±5°C. Immediately after bending the specimen on a Cylinder 5 times its diameter, the surface shall be free from cracks, and the cores and wires of the compensation wires shall be cracked. The insulation resistance between the core and the shield is not less than 25mΩ per meter. Armored anti-explosive thermocouples with low temperature winding performance are generally used after the compensation conductors are subjected to a low temperature winding test of -20°C, and visual observations are made to see that the insulation layer of the specimen wound on the test rods should be free of any cracks. Insulation resistance When the ambient air temperature is 15-35°C and the relative humidity is not more than 80%, the insulation resistance between the cores of the compensation wire and between the wire core and the shielding layer is not less than 5mΩ per 10 meters.

First, the use of anti-explosion thermocouple use principle

According to the latest explosion-proof code GB3838 designed in accordance with international IEC standards; armored explosion-proof thermocouple adopts two-chamber flameproof structure, easy replacement of temperature measuring element, safe and reliable explosion-proof mark dIICT6, suitable for below IIC grade, ignition temperature above T6 , temperature measurement with explosive gas.

Armored explosion-proof thermocouples seal all components that can generate sparks, arcs, and dangerous temperatures in the junction box cavity. When an explosion occurs in the cavity, the flame can be quenched and cooled through the gap between the junctions, allowing the flame and temperature to propagate after explosion. Not outside the cavity.

Overview of explosion-proof thermocouples Industrial flameproof RTDs are used as sensors for temperature measurement and control and display instruments, and are equipped with explosion-proof thermocouples to directly measure and control the temperature of gases, liquids, and vapors during production.

If a closed loop is composed of two homogeneous conductors (thermodes), when there is a temperature gradient at both ends of the explosion-proof thermocouple, there will be a current flow through the loop, and if the explosion-proof thermocouple is installed, then there will be thermoelectricity between the two ends. Explosion-proof original use gap explosion proof principle