Thermal resistance sensor working principle and installation requirements

Abstract: the working principle of the thermal resistance sensor and installation requirements information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Thermal resistance of thermistor sensor is a new type of semiconductor temperature measuring element. Semiconductor in conductive carrier, due to the number of carriers in semiconductor far far less than the number of free electrons in the metal, so it's resistivity. With the temperature. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a thermal resistor sensor working principle and installation requirements article details. Thermal resistance of thermistor sensor is a new type of semiconductor temperature measuring element. Semiconductor in conductive carrier, due to the number of carriers in semiconductor far far less than the number of free electrons in the metal, so it's resistivity. With the temperature rise, more valence electrons in the semiconductor heating stimulates the transition to a higher level and produce new electronic & ndash; Hole pair, and thus to electric power carrier number increases, the resistivity of the semiconductor is reduced ( Increase conductivity) 。 Because the carrier number according to the index law increases with temperature rise, so the resistivity of the semiconductor is along with the temperature rise according to the index law. Thermistor is using the semiconductor carrier number changes over temperature made of the characteristics of a kind of temperature sensitive components. When the temperature change 1 ℃, some semi-conductor thermistor resistance changes will reach ( 3 ~ 6) %。 Under certain conditions, according to the measurement of thermal resistance change of the change in temperature pressure sensor. Thermal resistance sensors installation requirements on 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 weighing sensor. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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