Electromechanical Level Measurement

Electromechanical Level Measurement

Endress+Hauser’s electromechanical level instruments (Silopilot FMM series) perform cyclical, contact-based measurement by lowering a sensing weight on a tape; pulses generated as the tape moves translate directly to distance and level. The measuring principle is independent of bulk density and remains dependable where radar or ultrasonic may struggle, e.g., heavy dust loads, foam, or complex silo geometry. The portfolio centers on two devices: Silopilot FMM20 (Lean) and Silopilot FMM50 (Extended). Both provide a 4‑line local display, 0/4–20 mA output, and an electronic minimum fail‑safe that prevents the weight from running into outlets; Ex documentation is available.

Silopilot FMM20 is the compact, value-optimized choice for light bulk solids and compatible liquids. It offers level measurements up to 42 m, accuracy to ±2.5 cm (±1 pulse), and process temperatures to +150 °C. The device is designed for conditions where acoustic or radar methods can be unreliable, and it can operate in aggressive atmospheres; interface (separation layer) detection is possible with suitable weights. Typical duties include cereals, plastic granulate, and powders in silos or bunkers; power can be 90–253 VAC or 24 VDC depending on the version. Outputs include 0/4–20 mA and freely programmable signaling (e.g., counter pulses) for simple integration into PLCs.

Silopilot FMM50 extends the envelope for tall or demanding storage: up to 90 m measuring range, process temperatures to +230 °C, and up to 3 bar abs. A broad set of sensing weights (e.g., normal, umbrella, bag, cage, bell) adapts the system to very light, free‑flowing, or coarse materials while also enabling separation‑layer detection in liquids. The device maintains accuracy to ±5 cm (±1 pulse), provides linearization to convert level to volume/mass for inventory, and uses the same display, 0/4–20 mA output, and electronic fail‑safe concept as FMM20. Applications span bunkers and silos with powdered, fine, or coarse bulk solids, as well as tanks with liquids, especially where dust, temperature, or vessel geometry would compromise non-contact methods.

Vector, your Authorized Endress+Hauser Representative