What is it

• The Deltapilot FMB50 is a hydrostatic (pressure-based) level transmitter sensor, part of the Deltapilot M line.
• It is used to measure level (or pressure) of liquids or paste‐like media by detecting the hydrostatic pressure at a point (usually near the bottom of a tank).

Key Features

Applications

• Used in both open and closed containers / tanks.
• Works with liquid and paste-like media. So even slurries or viscous fluids, as long as pressure transmission is possible.
• Not significantly affected by foam formation (which can cause issues for some other level sensors).
• Process and hygienic applications (e.g. food, pharma) where cleaning, material compatibility, and possibly certifications are important.
• It is compatible with safety-instrumented systems (SIL2).

Communication / Integration

• The device can output 4-20 mA with HART protocol.
• Also available with PROFIBUS PA and FOUNDATION Fieldbus interfaces, depending on configuration.
• Local display and menu-guided commissioning (for setting up zero, span, offsets etc.).

Advantages / What Makes It Good

• The sealed Contite cell means it handles condensate well; in cold or humid conditions, or where condensation inside sensor housings is an issue, this helps prevent measurement errors.
• Good accuracy, stability and minimal temperature effects.
• Versatile mounting options (threads, flush hygienic, flanges etc.) so it can be used in many tank types.
• Overpressure safety helps with process upsets. SIL2 capability helps in safety-critical environments.

Limitations / Considerations

• Because it measures hydrostatic pressure, fluid density matters: for a given pressure reading, the height (level) depends on density. If the density changes, you may need correction or use of dual sensors / differential setups.
• Installation must ensure that the sensor's zero point is well defined; avoid mounting in locations that cause turbulence, pressure shocks, or where foaming or sludge may accumulate on the membrane.
• For very high temperature, or extreme chemical compatibility, check material options and coatings.