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Industry Information
Armored thermocouple thermal response time lapse is firm and practical
2012-2-25 8:52:52

的工作原理是:两种不同成份的导体两端经焊接,形成回路,直接测温端称测量端,接线端称参比端。 The working principle of armored thermocouples is: two ends of conductors of two different components are welded to form a loop. The direct temperature measurement terminal is called the measurement terminal, and the terminal is called the reference terminal. When there is a temperature difference between the measuring end and the reference end, thermoelectric potential will be generated in the loop. Connect the display instrument, and the instrument will indicate the corresponding temperature value of the thermoelectromotive force generated by the thermocouple. The thermoelectromotive force of the armored thermocouple WRNK will increase as the temperature of the measurement terminal increases. The size of the thermoelectromotive force is only related to the material of the armored thermocouple conductor and the temperature difference between the two ends, and has nothing to do with the length and diameter of the thermoelectrode. The structure of the armored thermocouple is made of couple wire, insulated magnesium oxide and stainless steel protective tube after multiple draws. Armored thermocouple products are mainly composed of junction boxes, terminal blocks and armored thermocouples, and are equipped with various mounting fixtures.

There are two types of armored thermocouples: insulated and shell-type.

WRNK具有能弯曲、耐高压、热响应时间快和坚固耐用等许多优点,它和工业用装配式热电偶一样,作为测量温度的传感器,通常和显示仪表、记录仪表和电子调节器配套使用,同时,亦可以作为装配式热电偶的感温元件,它可以直接测量各种生产过程中从0℃~1100℃范围内的液体,蒸汽和气体介质以及固体表面的温度。 Armored thermocouple WRNK has many advantages such as flexibility, high voltage resistance, fast thermal response time, and ruggedness. It is the same as industrial assembled thermocouples. As a temperature sensor, it is usually used as a display instrument, recording instrument and electronic regulator. It can also be used as a temperature sensing element for assembled thermocouples. It can directly measure the temperature of liquid, steam and gas mediums and solid surfaces in the range of 0 ℃ ~ 1100 ℃ in various production processes. The working principle of the armored thermocouple is that two ends of two different composition conductors are welded to form a loop. The direct temperature measurement terminal is called the measurement terminal, and the terminal is called the reference terminal. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the loop. Connect the display instrument, and the instrument will indicate the corresponding temperature value of the thermoelectromotive force generated by the thermocouple. The thermoelectromotive force of the armored thermocouple will increase as the temperature of the measuring end rises. The size of the thermoelectromotive force is only related to the material of the armored thermocouple conductor and the temperature difference between the two ends, and has nothing to do with the length and diameter of the thermal electrode. The structure of the armored thermocouple is made of conductor, insulated magnesium oxide and stainless steel protective tube. Armored thermocouple products are mainly composed of junction boxes, terminals and armored thermocouples, and are equipped with various fixing devices.

Temperature measurement principle

A thermocouple is welded together with two conductors of different compositions. When the temperature at both ends is different, a thermoelectric potential is generated in the circuit. Therefore, a potential couple is a temperature-sensitive element that measures the temperature by measuring the electric potential. It is A converter that converts a temperature signal into an electrical signal and displays it on a display meter. The basic principle of thermocouple temperature measurement is ') thermoelectric effect'). Two metal conductors with different components are connected end to end to form a closed loop. If the temperature of the two contacts is not the same, thermoelectromotive force will be generated in the loop, forming heat. Current, this is the thermoelectric effect. A thermocouple is made by welding one end of two different metal materials. The welded end is called the measurement end and the unwelded end is called the reference end. The reference end is usually constant at a certain temperature (such as 00C) when it is heated. At time, thermoelectric potentials are generated at the contacts. If the temperature of the reference terminal is constant, the magnitude and direction of its thermoelectric potential are only related to the characteristics of the two metal materials and the temperature of the measuring terminal, and have nothing to do with the precision and length of the potential couple. When the temperature at the measuring end changes, the potential changes accordingly, and there is a fixed ') function') relationship between temperature and thermoelectric potential. Using this relationship, the temperature can be measured.

Measuring range

:能测量500℃以上的高温,火电厂种主蒸汽的温度,过热起管壁温度,高温烟气温度。 Armored thermocouple : It can measure the high temperature above 500 ℃, the temperature of the main steam in the thermal power plant, the temperature of the overheated pipe wall, and the high temperature flue gas temperature. Features: high temperature measurement, stable performance, accurate and reliable, simple structure, easy maintenance, convenient remote transmission of signals and multi-point switching measurement. Main model: Indexing number: S or LB-3 upper limit 1300 ℃ (short time 1600 ℃). B or LL-2 upper limit 1600 ° C (short-term 1800 ° C) K or EU-2 upper limit 1200 ° C (short-term 1300 ° C) T or CK upper limit -200 to 350 ° C (short-term 400 ° C) E or EA-2 upper limit- 200 ~ 900 ℃ thermal resistance: high measurement accuracy, stable performance, high sensitivity, wide application range, long-distance questioning, automatic temperature control and recording. ') Platinum thermal resistance'), the highest temperature measurement is 650 ℃, Pt50, Pt100, copper resistance: 50-150 ℃ Cu50, Cu100. Note: The error caused by the self-heating effect, the Pt working d current is less than 6mA, the effect of hysteresis, the large heat capacity, and sufficient heat exchange for accurate measurement. Installation: During installation, form a countercurrent with the measured medium, at least 90 °. Index: S or LB-3 upper limit 1300 ° C (short-term 1600 ° C). B or LL-2 upper limit 1600 ° C (short-term 1800 ° C) K or EU-2 upper limit 1200 ° C (short-term 1300 ° C) T or CK upper limit -200 to 350 ° C (short-term 400 ° C) E or EA-2 upper limit- 200 ~ 900 ℃: high measurement accuracy, stable performance, high sensitivity, wide application range, long-distance questioning, automatic temperature control and recording. Platinum, maximum temperature 650 ℃, Pt50, Pt100, copper resistance:

Technical index

Thermocouple model, index number and recommended temperature electrode material for different materials and diameters

When the thermal response time of the armored thermocouple changes stepwise, the time required for the output value of the thermocouple to change to a specified percentage of the step change is called the thermal response time, which is expressed by τ (take 50 (% Is represented by τ0.5). Thermal response time of armored thermocouple τ0.5 (seconds)

Note: The insulation resistance is expressed by MΩ · m, which is the product of the insulation resistance at room temperature and the length of the armored couple.

For example: 1000MΩ · m means: the insulation resistance of a 1m sample is

1000MΩ, the insulation resistance of the 10m sample is 100MΩ.

For armored couples with a length less than 1m, it is calculated as 1m.

Socket-type junction boxes and armored thermocouples with compensation leads are not included in this example.

Measurement range and accuracy