Hydrostatic Level

Hydrostatic Level

Hydrostatic level measurement derives level from the pressure created by a liquid column at a defined sensing point. A pressure transmitter or submersible probe measures hydrostatic head and converts it to level or volume once reference elevation and density are established. Endress+Hauser references Deltapilot and Waterpilot pressure transmitters for hydrostatic service in tanks or wells, with devices that can be submersible or installed outside a vessel.

Measurement performance is strongly influenced by the sensing cell and its protection against moisture, condensate, and aggressive atmospheres. The Contite measuring cell is described as being developed specifically for hydrostatic service, with the measuring element hermetically sealed between the process membrane and measuring membrane. In the Contite principle, the cell is protected between a process isolating diaphragm and rear isolating membrane and is presented as insensitive to condensation and aggressive gases.

Ceramic, oil‑free capacitive cells provide an alternative for broad chemical compatibility. The ceramic sensor is a “dry” sensor: process pressure acts directly on a robust ceramic isolating diaphragm, and a pressure‑dependent change in capacitance is measured at electrodes on the ceramic substrate and diaphragm. This approach supports stable measurement where media compatibility and long-term mechanical integrity are key.

Benefits called out for hydrostatic devices include condensate‑proof Contite construction for maximum plant safety, strong reproducibility and long‑term stability even after temperature shocks, and ceramic-cell chemical compatibility and mechanical stability based on ultra‑pure 99.9% ceramic. Robust ceramic membranes can incorporate integrated breakage detection and can be suitable for vacuum applications.

Typical applications include water and wastewater assets (wet wells, lift stations, reservoirs), environmental monitoring, and process or sanitary tanks. Submersible probes suit deep wells and open vessels, while externally mounted transmitters support closed tanks and locations where easy access is preferred. Engineering focus areas include density compensation when concentration varies, selecting the correct reference pressure (vented gauge, sealed gauge, or absolute), and installation details such as mounting elevation, vent protection, and diaphragm seal selection.

Instrumentation and Controls., an exclusive authorized representative of sales and service for Endress+Hauser.