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Battery thermocouple protection circuit

2015-02-01 23:44  
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Battery thermocouple protection circuit
K-type thermocouple is placed in insulation terminal block and the ambient temperature of the thermocouple is continuously controlled by 1N914 diode. Diode voltage can modify Thermal EMF on the junction force through feedback of small voltage regulator. Thermal EMF would be sent through to amplifier by 1.5MΩ and 475Ω. During the calibration, the thermocouple junction should be placed in the freezing cold water. Adjust 500Ω to ensure the output pressure of zero. Then insert thermocouple into the 250 ℃ furnace and adjust range for the output of 2.50V. In the range of 0 ~ 250 ℃, the accuracy for the K-type thermocouple is ± 3 ℃.