varun Posted November 19, 2015 Report Share Posted November 19, 2015 Hi, Please explain the working of BP 20 sensor inside..How it is measuring pressure when we are giving excitation voltage of 12 V..What is the sensor output voltage range.. Link to comment Share on other sites More sharing options...
pcorcoran Posted November 19, 2015 Report Share Posted November 19, 2015 The RNRG BP20 Barometric Pressure sensor uses absolute pressure transducer that creates a 0-5V DC signal. The output voltage is directly proportional to the barometric pressure. For example: The transfer function of the sensor is kPa = (Voltage x 21.79) + 10.55 typical (each unit comes with a unique calibration sheet). A 1v DC output from the sensor would be kPa = (1 x 21.79) + 10.55 = 32.34 kPa ~ 323.4 mb. A 4.8v DC output from the sensor would be kPa = (4.8 x 21.79) + 10.55 = 115.142 kPa ~ 1151.42 mb. That being said, the lowest recorded barometric pressure on earth was 870 mb and the highest was 1083.3 mb. This means that the voltage output will realistically range between 3.5V - 4.5V DC. Link to comment Share on other sites More sharing options...
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