Liquid density meter

An apparatus for measuring the density of a liquid or of a suspension of solids in a liquid comprising:

• (a) two pressure sensors adapted to be mounted in the liquid so that the two sensors are vertically at predetermined levels apart;
• (b) a differential pressure transducer;
• and
• (c) a differential pressure zeroing device interconnecting said pressure sensors to said differential pressure transducer, for providing an output proportional to the density of the liquid which is compensated for the differential pressure caused by the differential height of said pressure sensors in the liquid, said differential pressure zeroing device comprising a pair of U-tubes filled with liquid, first gas filled tubings interconnecting one branch of each U-tube to a respective pressure sensor, second fluid filled tubings interconnecting the other branch of each U-tube to said differential pressure transducer, and equalizing means for equalizing the pressure applied to each side of the differential pressure transducer when the apparatus is immersed into a liquid of standard density.