Float Switch Level Measurement

Float Switch Level Measurement

Endress+Hauser’s float switch level offering provides rugged, electromechanical point level detection for water‑based and many process liquids. The measuring principle is straightforward: a buoyant switch rides the surface; as the level rises or falls, an internal sensor changes state to deliver a discrete “on/off” signal. The portfolio centers on the Liquifloat FTS20 for use in tanks, vessels, and open basins. Typical functions include overfill/underfill alarms and pump protection in applications such as sewage treatment plants. Output choices are a NAMUR signal for hazardous areas or a universal change‑over contact.

Why choose a float switch? FTS20 delivers cost‑effective, dependable switching with minimal installed complexity. Different sensor and cable materials: PP, PVC, PUR and CSM, broaden compatibility to oily or chemically aggressive liquids and support hazardous‑area use. The device works from −2…+70 °C at pressures up to +3 bar and carries international Ex certificates. A compact form factor with a small diameter allows installation via a tapped G 1 A connection. Wiring can be either NAMUR to an isolator/barrier or a discrete AC/DC change‑over contact for direct PLC/relay input. As a FLEX “Fundamental” selection, it emphasizes simplicity and fast commissioning.

Where does it fit? Float switches excel in straightforward level tasks across utilities and process areas: open basins, lift stations, sumps, and standard storage/buffer tanks, providing pump start/stop (dry‑run protection), high/low alarms, and standalone interlocks. They are especially effective in water & wastewater service and in general industrial duties where ruggedness, clear state indication, and low lifecycle cost are valued, including media that are oily or chemically aggressive when matched to the appropriate probe/cable materials.

Vector, your Authorized Endress+Hauser Representative