WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

Overview of WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

Precious metal thermocouples are a type of thermocouple. Precious metal thermocouples are suitable for high temperature occasions in various production processes, and are widely used in temperature measurement of glass and ceramics and industrial salt bath furnaces. Precious metal is usually used to refer to gold, silver and platinum, which are expensive, beautiful in appearance, stable in chemical properties, and have a strong ability to preserve value. The status of gold is particularly important. Before the collapse of the Bretton Woods system, the currencies of Western countries were all pegged to the US dollar, and the US dollar was pegged to gold. Many countries announced the gold content of their currencies, and the status of gold was very important. After the 1970s, with the reorganization of the world's financial structure and the easing of inflation, the status of precious metals such as gold has declined, but they are still regarded as a universal medium of exchange and a store of value in the world. Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. When two ends of conductors with different compositions are connected into a loop, when the temperature of the two junction thermocouples is different, a thermal current will be generated in the loop. If there is a temperature difference between the working end of the thermocouple and the reference end, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. The thermoelectric heat of the thermocouple will increase as the temperature of the measuring end increases, and its size is only related to the temperature of the thermocouple material and both ends, and has nothing to do with the length and diameter of the hot electrode. The shape of various thermocouples is often very different due to needs, but their basic structure is roughly the same, usually composed of main parts such as thermode, insulating sleeve protection tube and junction box, usually with display instruments, recording instruments and electronic adjustment. used in conjunction with the device.

Working priciple of WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

The working principle of a thermocouple is that two conductors of different compositions form a closed loop. When there is a temperature gradient at both ends, a current will flow through the loop, and there will be an electromotive force between the two ends—thermoelectromotive force, which is called the Seebeck effect.

The thermocouple has only two wires, one positive and one negative. But there are also two-core thermocouples with four leads. Therefore, if there are three wires and two of them have the same color, it must be a thermal resistance, and the one with two leads marked with positive and negative electrodes is a thermocouple. Resistance and thermocouple, you can use a multimeter to judge at this time.

Calculation method of thermocouple cold junction compensation: From millivolt to temperature: measure the cold junction temperature, convert it to the corresponding millivolt value, add it to the millivolt value of the thermocouple, and convert the temperature; from temperature to millivolt: measure the actual temperature The temperature of the cold end is converted into millivolts respectively, and the millivolts are obtained after subtraction, that is, the temperature.

Features of WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

(1) Within the temperature measurement range, the thermoelectric properties are stable, do not change with time, have sufficient physical and chemical stability, and are not easy to oxidize or corrode;

(2) The temperature coefficient of resistance is small, the conductivity is high, and the specific heat is small;

(3) The thermoelectric potential generated in the temperature measurement should be large, and the relationship between the thermoelectric potential and the temperature is linear or close to linear single-valued function;

(4) The material has good reproducibility, high mechanical strength, simple manufacturing process and low price

Main tech data of WRR-130 WRR2-130 WRR-131 WRR2-131 Noble metal thermocouple

1. Graduation number <150s

2. Temperature sensing original: (platinum rhodium 30-platinum)

3. Junction box form: explosion-proof

4. Installation form: no fixed form

5. Casing material: corundum

6. The length range is: 300×150, 350×200, 400×250, 450×300, 550×400, 650×500, 900×750, 1150×1000, 1650×1500, 2150×2000

7. Casing diameter: Φ16

8. Temperature range: 0~1600

9. Response time: <150s

10. Accuracy class: class II

11. Protection class: IP65

12. Nominal pressure: normal pressure