Explosion-proof thermocouple principle and application points1

Instrumentation explosion-proof thermocouple measuring instrument is a kind of explosion-proof function, at the scene of the chemical production is often accompanied by various kinds of flammable, explosive chemical gases, such as steam, if use common thermocouple is very unsafe to environment caused by gas explosion, explosion-proof thermocouple is at this time. Engineering today is to introduce the working principle of the explosion-proof thermocouple and use points, hope you can help to you.

explosion-proof thermocouple principle

if by two kinds of different ingredients of homogeneous conductor ( Hot electrode) Form closed loops, when the temperature gradient is at both ends, the current through the loop, so both existed between thermoelectric potential explosion proof using the clearance flame-proof principle, design has enough strength of the junction box, and other components, all can produce spark, arc and dangerous temperature zero parts are sealed in the junction box, when an explosion cavity, can extinguish fire by joint clearance and cooling, the explosion flame and the temperature is not reached outside the cavity.

explosion-proof thermocouple use points

according to the latest rules of explosion-proof GB3838 accord with IEC international scale plan; Take two cavity flame-proof structure, changing temperature components of portable, insurance firm flame-proof marker d Ⅱ CT6, practical in Ⅱ C below level, ignition temperature above T6, places of explosive gas temperature measurement.

will all happen spark, arc and damage parts are sealed in the junction box cavity temperature, when the explosion cavity, can through the process of joint gap with cooling by accident, that after the explosion flame temperature less than outside the cavity.

overview of explosion-proof thermocouple industrial explosive thermal resistor as temperature measurement and control instruments, sensors and performance in the process of the produce with direct measurement to control the temperature of the gas, liquid and steam.

if the two kinds of different ingredients of homogeneous conductor ( Hot electrode) Constitute a closed loop, when the two ends of the explosion-proof thermocouple temperature gradient exists, the loop has electric fluid, and then two existed between thermoelectric potential explosion-proof flame-proof original application gap.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor