The working principle and installation requirements of thermal resistance sensor

Abstract: The information on the working principle and installation requirements of thermal resistance sensors is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The thermistor in the thermal resistance sensor is a new type of semiconductor temperature measuring element. It is the carrier that participates in conduction in the semiconductor. Since the number of carriers in the semiconductor is much less than the number of free electrons in the metal, its resistivity is large. with temperature. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the working principle and installation requirements of the thermal resistance sensor. The thermistor in the thermal resistance sensor is a new type of semiconductor temperature measuring element. It is the carrier that participates in conduction in the semiconductor. Since the number of carriers in the semiconductor is much less than the number of free electrons in the metal, its resistivity is large. As the temperature increases, more valence electrons in the semiconductor are thermally excited to transition to higher energy levels to generate new electrons—The number of hole pairs, and thus the number of carriers participating in electricity, increases, and the resistivity of the semiconductor decreases (conductivity increases). Because the number of carriers increases exponentially with temperature, the resistivity of semiconductors decreases exponentially with temperature. A thermistor is a temperature-sensitive element made of semiconductors that change the number of carriers with temperature. When the temperature changes by 1°C, the resistance value of some semiconductor thermistors will change by (3 to 6)%. Under certain conditions, the temperature change pressure sensor is obtained according to the change of the measured thermistor value. The installation of thermal resistance sensor requires attention to the installation of thermal resistance, which is conducive to accurate temperature measurement, safe and convenient maintenance, and does not affect equipment operation and production operations. To meet the above requirements, pay attention to the following points when choosing the installation position and insertion depth of the thermal resistance: 1. In order to ensure sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measuring point should be selected reasonably , try to avoid installing thermal resistance near valves, elbows and dead ends of pipes and equipment. 2. The thermal resistance with a protective sleeve has heat transfer and heat dissipation losses. In order to reduce the measurement error, the thermocouple and the thermal resistance should have sufficient insertion depth: (1) For the thermal resistance measuring the fluid temperature in the center of the pipeline, generally it should be Insert its measuring end into the center of the pipe (vertical or inclined). If the pipe diameter of the fluid to be measured is 200 mm, the insertion depth of the thermal resistance should be 100 mm; (2) For the temperature measurement of high temperature, high pressure and high-speed fluids (such as the main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and To prevent the protective sleeve from breaking under the action of the fluid, the protective tube can be shallowly inserted or the thermal sleeve type thermal resistance can be used. The depth of the shallow-inserted thermal resistance protection sleeve shall not be less than 75mm into the main steam pipe; the standard insertion depth of the thermal resistance of the thermal sleeve is 100mm; (3) If it is necessary to measure the temperature of the flue gas in the flue, although the smoke The diameter of the channel is 4m, and the insertion depth of the thermal resistance is 1m; (4) When the insertion depth of the measuring element exceeds 1m, it should be installed as vertically as possible, or a support frame and a protective sleeve load cell should be installed. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Thermal resistance sensor working principle and installation requirements'

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