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The diﬀerential sensor used in the example application is GE NovaSensor’s NPC-1210 series. The NPC-1210 has a typical Full Scale Output (FSO) of 50 mV for 10 inches of water. That is, 10 inches of water in the container corresponds to a typical sensor’s diﬀerential output voltage of 50 mV. This linear relationship is useful information for calculating the liquid’s height and determining the appropriate ADC and ampliﬁer for the system. This particular sensor was selected due to its low sensitivity characteristic, which means its output will be in the millivolts range. Since the example application has a small amount of liquid volume (approximately 540 inches3), a sensitive pressure sensor is adequate. It is important to select the pressure sensor appropriate for a given application.
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