Working principle of the thermocouple, heat resistance and characteristics

Abstract: the two kinds of different metal conductor welded together, constitute a closed loop, as in the welding end ( The measuring end) Heating temperature, is in the loop

can produce thermoelectric emf, this phenomenon is called the seebeck effect ( 塞贝克, 效果) 。 If the other side, The reference side) Keep a

set temperature ( General to 0 ℃) , the circuit of the thermoelectric emfs into a single value function of measuring end temperature. In the measurement of thermoelectric emf method to measure temperature

element, the two pairs of metal conductor, referred to as a thermocouple.

company: thermocouple, heat resistance, compensation conductor, temperature gauges, temperature sensors such as western medicine contact me

13505123780 thermocouple, heat resistance, working principle and characteristics of 1, the working principle of the thermocouple will be two different metal conductor welded together, constitute a closed loop, as in the welding end ( The measuring end) Heating temperature, can produce thermoelectric emf in the loop, this phenomenon is called the seebeck effect, 塞贝克, 效果) 。 If the other side, The reference side) Maintain temperature ( General to 0 ℃) , the circuit of the thermoelectric emfs into a single value function of measuring end temperature. This measurement method to measure the temperature of thermoelectric emfs components, namely the two pairs of metal conductor, referred to as a thermocouple. Thermocouple thermoelectric emfs, its size is only related to thermal electrode materials and temperature difference on both ends, has nothing to do with the hot electrode length and diameter. 2, the working principle of the thermal resistance of thermal resistance is also USES the resistance of the material when the temperature changes with the change of characteristics to measure temperature. 3, thermocouple, heat resistance characteristics of the thermocouple thermal resistance thermocouple compared with other kinds of thermometer has the following characteristics: (1) advantages, thermocouple temperature quantity can be converted into electricity, for temperature measurement, control, and the temperature signal amplification, transformation and so on are very convenient; Simple structure, easy to manufacturing; , low price; • inert small; High accuracy; • the measuring temperature range is extensive; Able to meet the requirements of all kinds of measuring object ( Certain parts or narrow place) , such as point and surface temperature measurement; • suitable for remote measurement and control. (2) faults, measurement accuracy is difficult to more than 0. 2℃； • must have a reference, and to maintain a constant temperature; , in the high temperature or use for a long time, due to impact or measured medium atmosphere corrosion action ( Such as oxidation, reduction) Wait and degradation. Thermal resistance compared with other kinds of thermometer has the following characteristics: (1) advantages, high accuracy. Of (among) all the commonly used thermometer, the highest accuracy, up to 1 mk; • output signal, high sensitivity. Such as Pt100 platinum thermal resistance measurement is used in the 0 ℃, 1 ℃ when temperature changes, changes its resistance value about 0. 4 Ω, if through the current of 1 ma, is the voltage output quantity into 400 mu V. Under the same conditions, even if a higher sensitivity K type thermocouple, the electromotive force change only about 40 mu V. Thus, high heat resistance, the sensitivity of the thermocouple one order of magnitude; Wide measuring range, stability is good. In the small vibration and the suitable environment, can maintain zero for a long time. The stability of 1 ℃ below; • no reference point. Temperature can be calculated directly by the measured resistance value. (2) faults, using fine wire thermal resistance element mechanical shock and vibration resistance is poor; , element structure complicated, difficult to manufacture; , not suitable for measuring small volume and temperature transient area.

download attachment: ( Have downloaded 0)