Density invariant displacer-type liquid level measurement utilizing differential pressure transmitter

A method for determining a level of a liquid in a liquid-containing vessel fluidically connected to a displacer cage, the method comprising:

• obtaining, with a load measurement device, a weight force of a displacer suspended from the load measurement device and disposed within the displacer cage;
• submerging the displacer into the liquid;
• obtaining, with the load measurement device, a net force acting on the displacer;
• obtaining, with a liquid density measurement sensor disposed within the displacer cage, a liquid density at a first location of the liquid;
• and
• determining, using, at least, the net force and the liquid density at the first location of the liquid, the level of the liquid in the vessel.

A system comprising:

• a liquid level measurement device, comprising:
• a displacer cage configured to be fluidically connected to a liquid-containing vessel through a fluid channel;
• a displacer disposed within the displacer cage;
• a load measurement device from which the displacer is suspended;
• and
• a liquid density measurement sensor configured to measure a liquid density within the displacer cage;
• a plurality of remote beacons;
• and
• a liquid level measurement system in communication with the liquid level measurement device and the plurality of remote beacons, the liquid level measurement system comprising a processor and a memory, the memory storing instructions that, when executed by the processor, cause the processor to:
• receive, from the load measurement device, a weight force of the displacer;
• receive, from the load measurement device, a net force acting on the displacer;
• receive, from the liquid density measurement sensor, the liquid density at a first location of the liquid;
• and
• determine, using, at least, the net force and the liquid density at the first location of the liquid, a level of the liquid in the vessel.