PT100 temperature sensor circuit diagram
Platinum and copper are the most widely used thermal resistor materials at present: Platinum resistor has high accuracy, is suitable for neutral and oxidizing media, has good stability, has a certain non-linearity, the higher the temperature, the smaller the resistance change rate; copper resistor has a linear relationship with temperature in the range of temperature measurement, and the number of temperature lines is large, so it is suitable for non-corrosive media. More than 150 are easily oxidized.
The most commonly used are R0 = 102, R0 = 1009 and R0 = 10002. Their indexing numbers are Pt10, Pt100. Pt1000 respectively. Copper resistors are R0 = 502 and R0 = 10092, and their indexing numbers are CU50 and CU100. Pt100 and CU50 are the most widely used.
Pt100, that is to say, its resistance value is 100 ohms at 0 degrees. PT100 temperature sensor is a resistance temperature sensor made of platinum (Pt), which belongs to positive resistance coefficient. The relationship between resistance and temperature change is as follows: R = Ro (1 + aT) Pt100 temperature sensor's main technical parameters are as follows:
Measurement range: -200C~+850"C; allowable deviation = C:A grade soil (0.15+0.002Itl). B grade soil (0.30+0.0051tl); thermal response time current s5mA. In addition, Pt100 temperature sensor also has the advantages of anti-vibration, good stability, high accuracy and high voltage resistance.