PT100 sensor The method of judging good or bad

PT100 Thermal resistance sensor is characterized by the characteristics of 100Ω at 0 ° C, the temperature low resistance decreases, you can first interrupt the PT100 wiring in the loop, and then use the resistor file of a universal meter (2002 2002 (2002 ) Measuring its high temperature resistance increased. Use a multimeter to judge good or bad.

resistance. However, the measurement results can only determine the good or bad of the PT100 and cannot be used as a basis for verifying its accuracy. At 0 ° C, the resistance value of PT100 is 100Ω. As the temperature increases the resistance value, the specific correspondence can be viewed.

1. The temperature range of the PT100 thermal resistance is t = 0 ~ 100 degrees, and its output is i = 4 ~ 20mA, and the relationship between I and T is: i = 4+(4/25)*T
If T = 0 degrees I = 4mA, I = 100 degrees I = 20mA. T = 25 degrees I = 8ma

2. Remove the PT100 thermal resistance and place it in a water container. Its output point, connect 25 (or 50) MA meter range meters, and then use a thermometer to measure the water temperature. The changes in the indicator value of the current marker, such as the change in the formula (1), this thermal resistance is good. This thermal resistance is bad.