electricalandelectronicslab2003[1] - Section B Gage...

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Section B: Gage pressure transducer for liquid level measurement Theoretical background An electronic gage pressure transducer will convert a measured pressure into an analog electrical signal. Thus the value of a specific physical property is converting into an electrical signal. When the pressure is applied to the pressure gage transducer, the strain gages are deformed and they are attached to it. Hence the induce deformation will increase the resistance value, a whetstone bridge will be used to determine the value of the resistance. The electrical resistance change will be proportional to the pressure. In this laboratory the pressure is caused by the water is rising in the tank. When the water is rising in the tank, the air present above the water is compressed and this pressure is the absolute pressure. The gage pressure will indicate the pressure difference between the compressed air and the surrounding. These values recorded follow the basic equation: P abs =P gage +P atm , hence P gage =P abs -P atm . In this electronic gage pressure , a piezoelectric transducer can be found and is placed between the two plates electrodes. The pressure applied will cause a deformation which is the origin of the induce voltage. Results and Discussion
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Plot of the experimental calibration curves for the gage pressure : Height of liquid ( cm ) Gage pressure mean (psig) 10,8 0 12,8 0,01 14,8 0,02 16,8 0,03 18,8 0,04 20,8 0,06 22,8 0,07 24,8 0,08 26,8 0,09 28,8 0,11 30,8 0,11 Gage pressure versus Height of liquid y = 0,0059x - 0,0656
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electricalandelectronicslab2003[1] - Section B Gage...

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