Principles of Operation
A hydrostatic level sensor is a submersible or externally mounted pressure sensor that determines level by measuring pressure above it, which increases with depth. From this measurement, together with knowledge of the liquid’s density / specific gravity, it is possible calculate the liquid level above the sensor in the vessel. Temperature compensation will take into account changes in specific gravity due to variations in temperature.
Advantages of Hydrostatic Level Sensors
- Easy to install and relatively low cost
- Good overall accuracy and long-term stability
- Applicable to a wide variety of fluids
Limitations of Hydrostatic Level Sensors
- Not suitable for solids or liquids with suspended solids
- Can only read level above the transmitter
- Need to know the density / specific gravity of the liquid being measured
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