Thermal resistance and thermocouple temperature sensor using the standard

The temperature sensor, now we have already familiar with. According to the materials and electronic components to sensor, temperature sensor are mainly thermocouple and thermal resistance temperature sensor. But when using, to meet the needs of the process control precision measuring signal, the use of thermal resistance and thermocouple temperature sensor has a certain standard.

due to pure metals have the greatest impedance changes, especially the very pure precious metal. Resistance temperature sensor is through resistance to test temperature. The positive temperature coefficient thermistor resistance is proportional to the temperature, and negative temperature coefficient thermistor is just the opposite.

if resistance with linear relation with the temperature, temperature can be calculated by polynomial. Usually, resistance thermometer measurement range is - 250 ℃ to 1000 ℃. This type of sensor including standardized sensor made of platinum, such as: Pt100, at 0 ℃ for 100 Ω. High precision measurement, they can be applied to multi engineering conditions of up to 850 ℃. Thermocouple, though less accurate thermal resistor, has faster response speed.

by two different metals or semiconductors can form a thermocouple temperature sensor. When a temperature difference between the two metals, in joint can produce pressure drop. This phenomenon is also called the seebeck effect. Thermal voltage and temperature of the metal, per kelvin output voltage is a few microvolts.

in fact, the measurement principle is measuring the difference in temperature between the hot end and cold end. If you want to determine the hot side temperature, must know the cold end temperature. And vice versa. In practice, people usually use other temperature sensors measure the cold end temperature. Through the voltage can be pushed to hot side temperature. Thermocouple sensors are usually used to measure the temperature over 1000 ℃. It depends on the junction temperature precision measurement precision.

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