Signal Conditioning Circuit For Temperature Sensor. Thermocouples operate on the seebeck effect which occurs when two dissimilar metals are joined at one end and remain open at the other creating a voltage at the open circuit. The 4 to 20 ma range is the most commonly used as it can travel the longest distance without degradation and is relatively immune to external noise signals.
It can be operated over the temperature range 50 c to 150 c making it ideal for use in numerous hvac instrumentation and automotive applications. The signal conditioning eliminates the need for any trimming. Components r2 r3 r4 and r5 are adjusted to change the desired measurement temperature span and output.
Resistive elements can be made sensitive to temperature strain by pressure or by flex and light.
Since the sensor product output is not 0 when the temperature is 0 c the zero. The ad22100 is a monolithic temperature sensor with on chip signal conditioning. Each has a different mode of operation and its own unique signal conditioning requirements. A voltage controlled current.
