Hydrostatic Level

Hydrostatic Level

Hydrostatic level measurement uses the pressure created by a liquid column to infer level, converting head pressure into a continuous level signal. It is a direct approach for liquid applications using pressure sensors, particularly where density is stable or can be compensated.

Implementation is either with submersible probes lowered into tanks, basins, or wells, or with transmitters mounted externally on a vessel nozzle. Endress+Hauser highlights Deltapilot and Waterpilot devices for tank and well installations, whether the sensor is submerged or installed outside the vessel. For harsh moisture exposure, the Contite sensor is developed for hydrostatic duties and is designed to protect sensor and cell electronics under severe moisture and condensate formation.

Hydrostatic devices are available with hermetically sealed measuring elements between the process membrane and measuring membrane, supporting stable operation over time. Oil‑free ceramic (capacitive) measuring cells are also offered and are typically used in process and environmental services. Integration options commonly include 0/4–20 mA and digital protocols such as HART, PROFIBUS PA, FOUNDATION Fieldbus H1, and IO‑Link.

Benefits include mechanical simplicity and robust performance when surface conditions are unpredictable - foam and vapor space turbulence have limited influence because the measurement is based on hydrostatic head. Response supports inventory tracking and control, and installation can be economical in small vessels or deep wells where non‑contact mounting geometry is constrained. Density changes (temperature, concentration) are addressed through compensation when tighter accuracy is required.

Common applications include water and wastewater wet wells and lift stations, reservoirs, groundwater monitoring, and storage tanks in food and beverage and chemical service. In pressurized vessels, hydrostatic measurement can be combined with a reference pressure measurement or differential arrangement to remove vapor space pressure effects. With correct density assumptions, venting practices, and corrosion‑compatible wetted materials, hydrostatic level measurement delivers reliable continuous level information.

Miller Mechanical Specialties, an exclusive authorized representative of sales and service for Endress+Hauser.