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Principles of OperationA 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.
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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
