There are usually two needle-like devices on the stove of a domestic gas stove. We call it a thermocouple and a spark pin. The quality of the thermocouple is related to the ignition reaction time and ignition success rate of the gas stove. Below we have the material from the thermocouple. , the working principle and other layers for everyone to do a detailed introduction:
What is a thermocouple? This is to start from the thermocouple temperature measurement principle. The thermocouple is a temperature sensing element . It is a primary instrument that directly measures the temperature and converts the temperature signal into a thermoelectric potential signal , which is converted into an electrical instrument (secondary meter). The temperature of the measured medium.
The basic principle of thermocouple conductors are two different components of the material composition of a closed loop, when both ends of the temperature gradient exists, there will be a current through the circuit, there Seebeck electromotive force between both ends of the case - thermoelectromotive force, This is the so-called Seebeck effect. The homogeneous conductor of two different compositions is a hot electrode, the higher temperature end is the working end, the lower temperature end is the free end, and the free end is usually at a constant temperature. According to the relationship between the thermoelectromotive force and the temperature , the thermocouple index table is prepared ; the index table is obtained under the condition that the free end temperature is 0 ° C , and different thermocouples have different index tables.
When a third metal material is connected to the thermocouple loop , as long as the temperature of the two contacts of the material is the same , the thermoelectric potential generated by the thermocouple will remain unchanged, that is, not affected by the third metal access loop. Therefore , when the thermocouple is measuring temperature , the measuring instrument can be connected , and after measuring the thermoelectromotive force , the temperature of the measured medium can be known.
Thermocouple working principle:
Two different conductors (called thermocouple wire or hot electrode) are joined at both ends into a loop. When the temperature of the joint is different, an electromotive force is generated in the loop. This phenomenon is called thermoelectric effect. The electromotive force is called the thermoelectric potential. Thermocouples use this principle for temperature measurement. The one that is directly used to measure the temperature of the medium is called the working end (also called the measuring end), the other end is called the cold end (also called the compensating end); the cold end and the display The instrument or the supporting instrument is connected, and the display meter indicates the thermoelectric potential generated by the thermocouple.
A thermocouple is actually an energy converter that converts thermal energy into electrical energy and measures the temperature with the generated thermoelectric potential. For the thermoelectric potential of a thermocouple, the following problems should be noted:
1 : The thermoelectric potential of a thermocouple is the difference in temperature function across the thermocouple, not a function of the temperature difference across the thermocouple;
2 : The magnitude of the thermoelectric potential generated by the thermocouple, when the material of the thermocouple is uniform, regardless of the length and diameter of the thermocouple,
Only related to the composition of the thermocouple material and the temperature difference between the two ends;
Only related to the composition of the thermocouple material and the temperature difference between the two ends;
3 : When the composition of the two thermocouple wires of the thermocouple is determined, the thermocouple potential of the thermocouple is only different from the temperature of the thermocouple.
Off; if the temperature of the cold junction of the thermocouple is kept constant, the thermoelectric potential of the thermocouple is only a single-valued function of the temperature at the working end.
Off; if the temperature of the cold junction of the thermocouple is kept constant, the thermoelectric potential of the thermocouple is only a single-valued function of the temperature at the working end.
Commonly used thermocouple materials are available ;
Thermocouple indexing number hot electrode material
Positive Negative
S platinum rhodium 10 pure platinum
R platinum rhodium 13 pure platinum
B Platinum é“‘30 Platinum é“‘ 6
K nickel chrome nickel silicon
T pure copper copper nickel
J iron copper nickel
N nickel chromium silicon nickel silicon
E nickel chromium copper nickel
Thermocouple indexing number hot electrode material
Positive Negative
S platinum rhodium 10 pure platinum
R platinum rhodium 13 pure platinum
B Platinum é“‘30 Platinum é“‘ 6
K nickel chrome nickel silicon
T pure copper copper nickel
J iron copper nickel
N nickel chromium silicon nickel silicon
E nickel chromium copper nickel
Zhejiang Yinzhou Oushile Electric Co., Ltd.
National free investment hotline
Address: No. 68, Weiyi Road, Chengdong Economic Development Zone, Quzhou City, Zhejiang Province
National free investment hotline
Address: No. 68, Weiyi Road, Chengdong Economic Development Zone, Quzhou City, Zhejiang Province
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