Main technical parameters and working principle of thermal resistance WZP-130

Thermal resistance WZP-130 is usually used in conjunction with display instruments, recording instruments, and electronic computers. It can directly measure the surface temperature of liquid, steam and gas medium and solid surface in the range of -200～500℃ in the production process. Our factory produces Pt100 platinum thermal resistance in accordance with IEC international standard indexing number and Cu50 copper thermal resistance in accordance with professional standard indexing number, two types of assembled and uniformly designed thermal resistances. In addition, it has simple assembly, convenient replacement, compression spring type temperature sensing element, good vibration resistance, large measurement range, high mechanical strength, and good pressure resistance. Working principle Thermal resistance uses the characteristic that the resistance of a substance changes as the temperature changes to measure temperature. The heated part (temperature sensing element) of the thermal resistance is evenly wound on a frame made of insulating material with thin metal wires. When there is a temperature gradient in the measured medium, the measured temperature is the range of the temperature sensing element. The average temperature in the inner dielectric layer. The assembled thermal resistance is mainly composed of a junction box, a protection tube, a terminal block, an insulating sleeve and a temperature sensing element, and is equipped with a variety of installation and fixing devices. The main technical parameters of the product implementation standard IEC751JB/T8622-1997JB/T8623-1997 normal temperature insulation resistance thermal resistance in the ambient temperature of 15 ~ 35 ℃, relative humidity not more than 80%, the test voltage is 10 ~ 100V (DC) electrode and outer tube Insulation resistance between ≥100MΩ. Temperature measurement range and accuracy Thermal resistance category measurement range ℃ division number allowable deviation △t　℃ WZP platinum resistance -200～420Pt100B grade tolerance ±(0.3 or +0.005︱t︱) A grade tolerance ±(0.15 or + 0.002︱t︱) Note: 't' in the formula is the absolute value of the measured temperature of the temperature sensing element. Resistance value The ratio of the resistance value (R100) of the thermal resistance temperature sensing element at 100°C to its resistance value R0 at 0°C: (R100/R0) Pt100: Grade A R0u003d100±0.06Ω Grade B R0u003d 100±0.12Ω thermal response time When there is a step change in temperature, the time required for the output of the thermal resistance to change to 50% of the step change is called thermal response time and represented by T0.5. The nominal pressure of the thermal resistance generally refers to the external pressure (static pressure) that the protective tube can withstand at the working temperature and does not break. The allowable nominal pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also related to its structure, installation method, placement depth, and the flow rate and type of the measured medium. The thermal resistance is very small, the insertion depth ︱minu003d︱元+15D︱min-the small available insertion depth ︱yuan-the length of the temperature sensing element D- the outer diameter of the protection tube will naturally affect the measurement of the current through the thermal resistance when the current is 5mA