Hydrostatic Level Measurement

Hydrostatic Level Measurement

Endress+Hauser’s hydrostatic level portfolio measures liquid level by converting hydrostatic head into an electronic signal using rugged pressure transmitters mounted on the vessel or submerged as probes. The range is built around two families: Deltapilot transmitters with the condensate‑proof Contite measuring cell for process tanks and Waterpilot submersible probes using an oil‑free ceramic cell for water and environmental duties. Devices deliver continuous level in open or closed vessels, wells, and basins, with 4–20 mA/HART and fieldbus options for straightforward integration.

Within Deltapilot, FMB50 is a compact transmitter for liquids and pastes, unaffected by foam. FMB51 is a rod version with a fixed process connection; FMB52 is a cable version with a fixed connection; and FMB53 is a cable version suspended from a clamp. All employ the hermetically sealed Contite cell for condensation resistance, cover typical ranges of 0.1…10 bar (≈ 100 m H₂O), and offer HART/PA/FF plus approvals such as SIL and WHG. Process connections span threads, flanges, and hygienic fittings, easing deployment across utilities and process areas.

For elevated performance, Deltapilot FMB70 adds a two‑chamber housing and the integrated HistoROM/M‑DAT data module for fast device replacement and parameter management. It increases reference accuracy to 0.1 % (optionally 0.075 %) while retaining the Contite cell’s immunity to condensation and foam. Designed for demanding processes and hygienic applications, FMB70 supports safety instrumented systems up to SIL 3 alongside WHG and marine approvals.

Waterpilot submersible probes target water and environmental applications. FMX11 is the simple, drinking‑water‑approved choice for clean water in wells, towers, lakes, and rivers, with measuring distances to 20 m H₂O and compact installation. FMX21 adds HART with freely adjustable ranges, integrated temperature, density‑compensated level calculation, and versions for wastewater/sludge or seawater, reaching 200 m H₂O. Its oil‑free ceramic membrane combines chemical compatibility with mechanical robustness for long service life in harsh media.

Why hydrostatic? It remains reliable where vessel geometry, foam, agitation, or internals challenge non‑contact methods. The Contite cell protects the measuring element between two isolating diaphragms, delivering reproducibility and long‑term stability, even after temperature shocks and in the presence of aggressive gases and condensation. The ceramic cell offers high chemical resistance and mechanical stability, with options such as membrane‑break detection. Typical uses span storage and day tanks, CIP/mix vessels, open basins and sumps, lift stations, groundwater monitoring, and deep wells across water/wastewater, chemical, power, marine, and other industries.

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