Instrument in huashi to introduce the explosion-proof heat resistance principle and installation requirements of release time: 2019 - 05 - 31 viewed:

Usually the explosion-proof resistance and display meter, recording meter, etc. Directly measuring the production site exist hydrocarbon explosion range of 0 ~ 500 ℃ liquid, steam and gas medium, as well as solid surface temperature. Explosion-proof heat resistance using the clearance flame-proof principle, design has enough strength of the junction box, and other components, will all produce spark, arc and dangerous parts are sealed in the junction box cavity temperature, when the explosion cavity, can remove from heat and cooling by joint clearance, made after the explosion flame temperature and not reach outside the cavity, thereby for temperature measurement. Installation requirements: the thermal resistance of the installation, should be paid attention to for accurate temperature measurement, safety examination and maintenance is convenient, and does not affect the equipment operation and production operations. To meet the above requirements, in the choice of the thermal resistance of the installation site and insertion depth should pay attention to the following: 1, in order to make the measurement end of the thermal resistance and had good heat exchange between the measured medium, should be a reasonable choice of observation, try to avoid the valve, elbow and pipe and equipment near the corner of installing heat resistance. 2, with a protection casing thermal resistance of heat transfer and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have enough insert depth: ( 1) For thermal resistance temperature center fluid, usually should be measuring end is inserted into the pipe center ( Vertical or inclined installation) 。 As the current body of pipe diameter is 200 mm, the thermal resistance should choose insert depth 100 mm; ( 2) For high temperature and high pressure and high velocity of temperature measurement, Such as main steam temperature) , in order to reduce cases of fluid resistance and prevent cases break under the action of a fluid, can take protecting tube shallow inserted way or use hot shell heat resistance. Shallow inserted type thermal resistance to protect casing, and its depth into the steam pipe should be no less than 75 mm; On a hot resistance standard insert depth of 100 mm; ( 3) If is need to measure the temperature of flue gas, although the flue is 4 m in diameter, thermal resistor insertion depth of 1 m. ( 4) When measuring the original insertion depth of more than 1 m, shall be installed vertically, as far as possible or add racks and protect casing.