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Differential temperature measurement Circuit Diagram

2014-11-23 11:11  
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Differential temperature measurement Circuit Diagram
The temperature difference between two points is often measured in many situations. For example, in water pump fan design and other designs, the impeller shape is always detemined by the temperature difference between the entrance and exit. if the difference is small, it requires high precision phase resolution. Figure 8 shows a high sensitivity temperature measurement circuit with 100mV / ℃ sensitivity. The precision op amp LM308 ouput 10 times of the differential temperature voltage the two temperature sensors measured. The Op amp output will be 0 by adjust the Rw when the two sensors are in the same temperature.