Non-fixed assembly thermocouple

Non-fixed assembly thermocouple

Overview of Non-fixed assembly thermocouple

The assembled thermocouple is a commonly used temperature measuring element in temperature measuring instruments. Non fixed assembled thermocouple produced by Jiangsu Xunfei can directly measure the temperature of liquid, gas, steam and solid surfaces in the range of 0 ℃ ~ 1000 ℃ in various industrial production processes, convert the temperature signal into thermoelectric EMF signal, and convert it into the temperature of the measured medium through secondary instruments. In practical applications, thermocouples have many structural ways, but their working principles are the same. Because of their simple structure, convenient manufacturing, wide temperature measurement range, high precision, small inertia and convenient remote transmission of output signals, they are widely used in industrial production.

Main tech data of Non-fixed assembly thermocouple
◆ measurement range: 0-800-1000 ℃
◆ graduation number: K graduation
◆ accuracy level: Level I (± 1.5 ℃ or ± 0.004 t ｜) level II (± 2.5 ℃ or ± 0.0075 t ｜)
◆ thermocouple type: nickel silicon nickel silicon
◆ junction box type: waterproof junction box
◆ installation method: no fixed device
◆ diameter of protective tube: 16mm
◆ protective tube material: stainless steel 304, 321, 316, 2520, etc
◆ insertion depth of protective tube: l=100-2000mm
◆ thermal response time: t0.5<80s (when the temperature changes in steps, the output of the thermocouple changes to 50% of the change, the time required is called thermal response time, which is expressed by t0.5)
◆ nominal pressure of thermocouple: normal pressure (generally refers to the static external pressure that the protective tube can withstand without cracking at room temperature)
◆ nominal flow rate of thermocouple: 0 m / S
◆ insulation resistance of thermocouple: the test voltage of insulation resistance at room temperature is DC 500V ± 50V, the atmospheric conditions are temperature 15~35 ℃, relative humidity 45%, atmospheric pressure 86~106kpa, and its insulation value at room temperature should be ≥ 100m Ω.
◆ executive standard: jb/t9238-1999

Product working principle of Non-fixed assembly thermocouple
When there are two different conductors, and their two ends are welded with each other, the temperature at the two nodes is different. The temperature at one end is the measuring end or working end, and the temperature at the other end is the free end or cold end. When there is a temperature difference between the two ends, thermal current will be generated in the loop. Equipped with a display instrument, the instrument can display the corresponding temperature value of the thermoelectric EMF generated by the thermocouple. The thermoelectric EMF of the thermocouple will increase with the temperature rise at the measuring end or working end. The size of the thermoelectric EMF of the thermocouple is only related to the conductor material and the temperature difference at both ends, and has nothing to do with the length and diameter of the conductor.

Model example of Non-fixed assembly thermocouple:
WRN-130 refers to the assembled thermocouple with k-graduation, no fixed belt, waterproof junction box and protective tube diameter of 16mm, which can be double.
WRE-130 refers to an assembled thermocouple without a fixed belt waterproof junction box and a protective tube with a diameter of 16mm, which can be double.
WRN-120 refers to the assembled thermocouple with k-graduation, no fixed belt, splash proof junction box, and protective tube diameter of 16mm, which can be double.
WRE-120 refers to an assembled thermocouple with e-graduation, no fixed belt, splash proof junction box, and a protective tube diameter of 16mm, which can be double.

Product installation picture