The composition of thermal resistance temperature measurement system

Thermal resistance temperature measurement system composed of thermal resistance temperature measurement spare ordinary by thermal resistance, connecting wires and display instrument, etc. Must pay attention to the following two points:

1. Thermal resistance and display instrument index number must be the same

2. In order to eliminate the influence of the connecting wire resistance change, it is necessary to adopt three wire connection

thermal resistance means, its resistance value is changing with the temperature, for example, using linear match good resistance of platinum wire, copper wire. Industrial heat resistance of ordinary adopts Pt100, Pt10 Pt1000, Cu50 Cu100, platinum thermal resistance of the temperature field of average for 200 - below zero 800 degrees Celsius, the thermal resistance of copper of 40 to 140 degrees Celsius below zero.

if made of platinum thermal resistance, the dividing Pt100. Means that its value at 0 degrees to 100 ohms, minus 200 degrees to 18. 52 ohm, 200 degrees for 175. 86 ohms, 800 degrees for 375. 70 ohms.

for example made of copper wire, thermal resistor Cu50 number index. It at 0 degrees, is 50 ohm resistance value, 100 degrees is 71. 400 ohms.

thermal resistance formula are Rt = Ro ( 1+A*t+B*t*t) ; Rt = Ro [ 1+A*t+B*t*t+C( t- 100). * t * t * t] , t said Celsius, Ro is the resistance value at zero degrees Celsius, A, B, C is the coefficient of rules, regarding Pt100, Ro is equal to 100.

dividing definition: on behalf of the temperature field, and on behalf of each index, the thermocouple or heat resistance of http://www. wuxiyibiao。 Com/detail how many temperature input how many volts may millivolt voltage.