In the domestic gas stove usually have two needle-like device called a thermocouple and spark our needle bearing on the quality of the thermocouple gas stove ignition ignition reaction time and success rate , let the material from the thermocouple , working principle and other aspects to you a detailed description:

    What is Thermocouple  This principle Speaking from thermocouple , thermocouple is a temperature sensing element, is an instrument , which directly measure the temperature , and the temperature signal is converted into thermal emf signal through the electrical instrument ( secondary instrument ) into measured medium temperature.

    The basic principle of thermocouple are two conductors of different material components of a closed loop , there is a temperature gradient when both ends , there will be a current through the circuit , when there is between the ends Seebeck EMF - thermal EMF , this is called the Seebeck effect . Two different components of the hot electrode conductor is homogeneous , the temperature of the higher end of the working end , the lower end of the temperature of the free end , the free end in a generally constant temperature . According to the thermal electromotive force as a function of temperature , thermocouple made ​​of indexing table ; indexing table is the free end of the temperature at 0 ^oC under the conditions of different thermocouples with different indexing table .

    Access the thermocouple circuit third metal material, two contacts as long as the material at the same temperature , the thermal voltages generated by the thermocouple remain unchanged from the third loop of metallic access . Therefore, the thermocouple , the measuring instrument can be connected , the measured thermal emf , you can know the temperature of the measured medium .

Thermocouple works:

Two different components of the conductor ( wire thermocouple or called hot electrode ) connected across the synthesis loop , when the engagement point temperature is not the same , the electromotive force is generated in the loop , a phenomenon known thermoelectric effect , and this emf called thermoelectric power . This principle is the use of thermocouples for temperature measurement , wherein the temperature of the measuring medium directly used as an end known as the working end ( also called measurement side ) , the other end is called the cold side ( also called compensation side) ; cold side of the display instrument or supporting instrument connection indicator will indicate thermocouple thermoelectric power generated .

    Thermocouple is actually an energy converter that will convert heat into electricity , thermoelectric power generated by the measurement of temperature, for thermocouple thermoelectric power, should pay attention to the following questions :

1 : the thermocouple thermocouple thermoelectric power function of the temperature difference between both ends , rather than a function of the temperature difference across the thermocouple ;

2 : thermoelectric power generated by the thermocouple size , when the thermocouple material is uniform and independent of length and diameter of the thermocouple ,
Only the material composition and the thermocouple temperature difference between both ends ;

3: When the two thermocouple wire thermocouple material composition is determined, the size of the thermocouple thermoelectric power only with the thermocouple temperature difference has
Off ; when the thermocouple cold junction temperature is kept constant, this thermocouple thermoelectric power into the working end is only single-valued function of temperature .