FMB53

A hydrostatic level transmitter detects liquid level by measuring the hydrostatic pressure of the liquid. The core principle is based on the formula P = ρ·g·H + P0. When the liquid density remains constant, atmospheric pressure is introduced into the sensor’s negative pressure chamber through a vent tube to compensate for atmospheric pressure (P0). The hydrostatic pressure (P) is then proportional to the liquid level height (H). The process pressure directly acts on the internal sensing element, such as a ceramic process isolation diaphragm. The pressure compensation tube transfers atmospheric pressure variations to the back of the sensing element for compensation. The deformation of the sensing element generates a capacitance change proportional to the pressure. The capacitance variation is converted into a pressure-proportional signal, which has a linear relationship with the medium level. After temperature compensation and linearization, the transmitter outputs a standard 4–20 mA signal.

Economical

The cable version Deltapilot FMB53 with suspension clamp uses a Contite measuring cell and is mainly designed for environmental applications. It can measure the level of liquids or slurries in open or closed vessels, with measurement unaffected by foam. The device is designed according to IEC 61508 standards and meets SIL2 functional safety requirements.