Difference between Displacement Type Level Transmitter and Differential Pressure Type Level Transmitter
(1) Displacement Type Level Transmitter
This is a type of liquid level meter in which a cylinder container with a certain volume of capacity is immersed in the liquid surface and the liquid is output as a buoyancy signal depending on the temperature.
It is used to measure not only the liquid level but also the level interface as the weight of liquid corresponding to the amount of liquid displaced by the amount of displaced volume literally (displaced volume) appears as buoyancy.
When used as a level interface, the buoyancy difference corresponding to the density difference is converted into the volume and expressed as the height signal of the contact liquid level.
(2) Differential Pressure Type Level Transmitter
This is a liquid level sensor that measures by measuring the pressure on the liquid level and the pressure difference on the bottom of the liquid level.
Both Displacement Type and Differential Pressure Type are the same as measured by “force”, but the former is different from buoyancy and the latter is different from static pressure. Both have the same ability to measure the liquid surface and the contact surface.
To be able to measure the contact surface, the former must be fully immersed in the float, the latter should be completely immersed in the top nozzle, and equilibrated to the static pressure. You can measure the exact liquid level or the contact surface height.