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SILICON_DIODE_SENSOR

2014-11-29 11:10  
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SILICON_DIODE_SENSOR
Ordinary silicon diode having temperature coefficient of about -2 mV/℃over wide temperature range serves for sensing temperature differentials up to ±10°F with resolution of about 0.3°F. Two diodes connected in resistor bridge provide voltage proportional to temperature difference at terminals A and B.Pot suppliesvariable offset current corresponding to presettable temperature offset range. Low output voltage of bridge is amplified by opamp such as Motorola MC1741 which gives output swing of 30 V for input change of 0.3 mV. Buffer transistor is added for handling Ioad such as motor control relay.- Industrial Control Engineering Bulletin, Motorola, Phoenix, AZ, 1973, EB-4.