Product introduction
Thermocouple is a temperature sensor, is a meter. It directly measures the temperature, and the temperature signal into thermoelectromotive force signal, through the electrical instrument (secondary instrument) into the measured medium temperature. Thermocouple temperature is the basic principle of two different components of the material composition of the closed loop, when there is a temperature gradient at both ends, the circuit will have a current through, there is between the two ends of the electromotive force - Is the so called Sebeck effect. The homogeneous conductor of two different components is a hot electrode, the higher end is the working end, the lower end of the temperature 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 indexing table is made. The indexing table is obtained when the free end temperature is at 0 ℃, and different thermocouples have different indexing tables.
When the third metal material is connected to the thermocouple circuit, the thermoelectric power generated by the thermocouple will remain unchanged as long as the temperature of the two contacts of the material is the same, that is, not affected by the third metal access circuit. Therefore, the thermocouple temperature measurement, access to measuring instruments, measured thermoelectromotive force, you can know the temperature of the measured medium.
working principle
Two different components of the conductor (known as the thermocouple wire or hot electrode) at both ends of the circuit into the circuit, when the junction temperature is different, the circuit will produce electromotive force, this phenomenon is called thermoelectric effect, and this The electromotive force is called thermoelectric potential. Thermocouple is the use of this principle for temperature measurement, which is used directly as the measurement medium temperature is called the end of the work (also known as the measurement side), the other end is called the cold end (also known as the compensation side); cold end and display Instrument or supporting instrument connection, the display instrument will point out the thermocouple generated by the thermoelectric power.
Thermocouple is actually an energy converter, it will be converted into electrical energy, with the generated thermoelectric potential measurement of temperature, thermocouple for the thermoelectric power, should pay attention to the following questions:
1, the thermoelectric power of the thermocouple is the function of the temperature difference between the two ends of the thermocouple working end, rather than the cold junction of the thermocouple and the working end,
2, the size of the thermoelectric power generated by the thermocouple, when the thermocouple material is uniform, and the thermocouple length and diameter has nothing to do with the thermocouple material only and the temperature difference between the two ends;
3, when the thermocouple two thermocouple wire material composition is determined, the thermoelectric thermoelectric power of the size, only with the thermocouple temperature difference; if the thermocouple cold end of the temperature to maintain a certain thermocouple thermocouple only The single - valued function of the working - end temperature. The two different materials of the conductor or semiconductor A and B welded together to form a closed loop, as shown. When there is a temperature difference between the two dedicated points 1 and 2 of conductors A and B, an electromotive force is generated between the two, and thus a current of magnitude is formed in the circuit, which is called a thermoelectric effect. Thermocouple is the use of this effect to work.
Features
1, the assembly is simple, easy to replace;
2, compression spring-type temperature sensor, seismic performance is good;
3, high precision measurement;
4, measuring range (-200 ℃ ~ 1300 ℃, special circumstances -270 ℃ ~ 2800 ℃);
5, fast response time;
6, high mechanical strength, good pressure resistance;
7, high temperature up to 2800 degrees;
8, long service life
Structural requirements
Thermocouple structure In order to ensure reliable thermocouple,
Steady work, its structural requirements are as follows:
1, the composition of the two thermocouple thermocouple welding must be strong;
2, two hot electrodes should be well insulated from each other to prevent short circuit;
3, compensation wire and thermocouple free end of the connection to be convenient and reliable;
4, protective casing should be able to ensure that the thermal electrode and harmful media fully isolated.
STC-10
Screw thermocouple,0-600℃,M6,2 meters
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STC13
Pressure spring thermocouple,0-600℃,interface thread M12*1.5,probe tube φ5*30mm,6mm screw M6,type K,cable length 2M
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WRNT-03
Probe type thermocouple(not waterproof), 7*2000*2000(mm),0-600℃,deviation 0.5℃,type K,cable length 2M
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WZCT-03
Probe type thermal resistance Pt100, 7*2000*2000(mm),-100~100℃,cable length 2M
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WRNT-13
Probe type thermocouple(not waterproof), metal wire,7*2000*2000(mm),0-600℃,deviation 0.5℃,type K,cable length 2M
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STC-1
PT100 temperature sensor,1M,4*30MM
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STC-4
PT100 temperature sensor,1M,5*50MM,accuracy 0.1
