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Rapidly rising temperature thermocouple sensors market briefly

The rapid rise in temperature thermocouple sensor market. Thermocouple temperature sensor as an important category of thermocouple sensor, account for more than 40% of the total demand for the thermocouple sensor. Thermocouple temperature sensor is the use of NTC resistance varies with the characteristics of temperature change, will not electrical quantities into electrical signal, thereby to accurate measurement and automatic control of temperature of semiconductor devices. Thermocouple temperature sensor USES is very wide, can be used for temperature measurement and control, temperature compensation, flow velocity and flow rate measurement, level indicator, temperature and wind speed, ultraviolet and infrared measurement, microwave power measurement is widely used in color TV, computer color display, switching power supply, water heater, refrigerator, kitchen equipment, air conditioning, automotive and other fields. In recent years the rapid growth of the automotive electronics, consumer electronics industry led to the rapid growth of the thermocouple temperature sensor needs in China.

temperature thermocouple sensors this influence is particularly acute in rapid measurement. So should be used as thermal electrode is small, small thermocouple protection tube diameter. Temperature measuring environmental permits, even protecting tube can be taken. Due to measurement lag, using thermocouples detect temperature fluctuations of the amplitude of the furnace temperature fluctuation amplitude of the small. Measurement lags behind, the greater the fluctuation amplitude of the thermocouple is smaller, and the actual temperature difference. When using the time constant of thermocouple temperature or temperature control, instrument display temperature fluctuation is small, but the actual furnace temperature fluctuations can be quite large. In order to accurately measure temperature, should choose small thermocouple time constant. With thermocouple time constant is inversely proportional to the heat transfer coefficient, heat the density and specific heat is proportional to the diameter, material, such as to reduce the time constant, in addition to the increased heat transfer coefficient, the most effective way is to try to decrease the size of the hot end. Use, usually USES the material with good thermal conductivity, thin, small diameter of the tube wall to protect casing. In the precision of temperature measurement, using unprotected casing bare wire thermocouple, thermocouple easy damaged, should be timely correction and replacement.

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

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