Principle resistance thermometer is the use of a conductor or semiconductor resistance varies with temperature this feature. The main advantage of the thermal resistance thermometers are: high accuracy, reproducibility is good; a larger measuring range Main armored thermal resistance, especially in terms of low temperature; Ease of use in automatic measurement, it is also easy to distance measurement. Similarly, the thermal resistance is also flawed, at high temperature (greater than 850 ℃) measurement accuracy is not good; impatience susceptible to oxidation and corrosion. The purity of platinum resistance ratio usually expressed: W (100) = R100 / R0 R100 represents a resistance value of 100 ℃ when; R0 represents the resistance value at 0 ℃ according to the IEC standard, the use of W (100) = 1.3850 initial resistance value R0 = 100Ω (R0 = 10Ω) platinum resistance industry standard platinum resistance, R0 = 10Ω of platinum resistance thermometer resistance wire thicker, mainly used in measuring a temperature of above 600 ℃. Platinum resistance and temperature resistance of the equation for a piecewise equation: Rt = R0 [1 + At + Bt2 + C (t-100 ℃) t3] t represents -200 ~ 0 ℃ Rt = R0 (1 + At + Bt2) t represents 0 ~ 850 ℃ Solutions in this equation can be based on the resistance value of the known temperature value armored thermal resistance price, but the actual work, the thermal resistance can check the indexing table to determine the temperature value based on the resistance value. According to standard wholesale armored thermal resistance, platinum RTD is divided into A and B grades, A-level temperature tolerance ± (0.15 ℃ + 0.002 | t |), B-grade temperature tolerance ± (0.3 ℃ + 0.005 | t |). Armored thermal resistance pictures, Inner Mongolia armored thermal resistance, since the instrument armored force measuring thermal resistance provided by the Shanghai Automation Instrumentation Co. measured. Shanghai Automation Instrumentation Co., force measurement (www.licesh.com) strong, credible, in Shanghai Zhabei District, flow meters and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the force measured since the instrument into the brilliant and you work for a better future!