WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

Overview of WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

Assembled thermocouple WRF-131 is used as a sensor for measuring temperature, and is usually used in conjunction with display instruments, recording instruments, electronic computers, etc. Solid surface temperature. In addition, it has the advantages of simple assembly, convenient replacement, compression spring type temperature sensing element, good anti-vibration performance, large measuring range, high mechanical strength and good pressure resistance performance.

Working principle of WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

The thermoelectromotive force of the thermocouple will increase as the temperature of the measuring end increases. The size of the thermoelectromotive force is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and has nothing to do with the length and diameter of the thermode. The assembled thermocouple is mainly composed of a junction box, a protection tube, an insulating sleeve, a terminal, and a hot electrode, and is equipped with various installation and fixing devices.

The working principle of the prefabricated thermocouple WRF-131 (Tiankang instrument) is: the two ends of the conductor with different components are welded to form a loop, the direct temperature measurement end is called the measurement end, and the terminal end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the loop. When the display instrument is connected, the instrument will indicate the thermocouple and the corresponding temperature value of the generated thermal electromotive force.

Features of WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

Assembly Thermocouple Thermal Response Time
When there is a step change in temperature, the output of the thermocouple changes to 50% of the change, and the time required is called the thermal response time, which is represented by T0.5.

Thermocouple nominal pressure
Generally, it refers to the static external pressure that the protection tube can withstand without breaking at room temperature. In fact, the allowable working pressure is not strictly related to the protective tube material, diameter and wall thickness, but also to its structural form, installation method, insertion depth, and the flow rate and type of the measured medium. It should not be less than 8 to 10 times the outer diameter of the assembled thermocouple protection tube (except for special products).

Thermocouple insulation resistance (room temperature)
The test voltage of insulation resistance at room temperature is DC 500V±50V, and the atmospheric conditions for measuring insulation resistance at room temperature are temperature 15~35℃, relative humidity 45%, and atmospheric pressure 86~106kPa.
a. For a thermocouple with a length of more than 1 meter, the product of the insulation resistance value at room temperature and its length should not be less than 100.
That is, Rr.L≥100 MΩ. M L＞1m
In the formula: Rr-Thermal temperature insulation resistance value of thermocouple MΩ
b. For a thermocouple with a length equal to or less than 1 meter, its normal temperature insulation resistance value should not be less than 100 MΩ

Main tech data of WRF-130 WRF2-130 WRF-131 WRF2-131 Assembly thermocouple

Material for temperature-sensing element: Iron-copper nickel

Number of thermal wire couple: Non, single support, 2 double support

Installation and fixation mode: Non-fixing device

Junction box forma: water-proof type

Diameter of protective tube: 0~~16mm, 1~~20mm