Tank level measuring system.

摘要

A system for measuring the amount of liquid product in a storage tank and including a first pair of pressure transducers disposed at a bottom of the storage tank and spaced relatively closely one to the other. There is also provided a second pair of pressure transducers disposed a predetermined distance above the bottom of the storage tank and spaced a distance from the first pair of pressure transducers that is greater than the spacing between the transducers of either pair. Sensing means are provided for measuring pressure differentials between the transducers of the first pair and also for measuring pressure differentials between the transducers of the second pair. Furthermore, sensing means are provided for providing a density measurement by measuring the pressure differential between one of the transducers of each pair. Water level detection at the bottom of the tank is carried out by measuring the pressure differential between the lowermost pair of transducers. In one embodiment the pressure transduction is from liquid pressure to pneumatic pressure employing remotely disposed pressure-to-electrical transducers. In an alternate embodiment the transducers within the tank are pressure-to-electrical transducers providing direct pressure readings in the tank.