Boot & Membrane Level Switches

No. Filsa's datasheet describes it as a general membrane level switch for minimum or maximum level of dense or abrasive bulk solids in silos, bins and hoppers, not a bucket-elevator-specific device. It's commonly fitted in elevator boots, but that's one of several uses. Tell us the vessel and material and we'll confirm the fit.

The AD version has a reinforced stainless steel 1.4301 membrane for dense or abrasive materials and covers -20 to +200 °C. The CD version has an NBR membrane, covers -25 to +80 °C, and suits general powders and granules. Both switch 15 A at 250 VAC and are rated to +0.5 bar.

A membrane switch has no moving parts inside the vessel: material pressure alone moves the membrane and trips the contact. A vibrating fork has a tuning-fork probe that a control circuit drives and monitors, which detects material by damping rather than direct pressure. Both give a single switch point, but the membrane type suits abrasive solids that would wear a fork.

+0.5 bar, for both the AD and CD versions. That covers the pressure typically found in silos, bins, hoppers and elevator boots at atmospheric ambient pressure. If your vessel runs higher, tell us and we'll check an alternative switch.

Yes. It's designed for dusty, powdery, granulated and grainy bulk goods. Choose the AD version, with its reinforced stainless steel membrane, when the material is dense or abrasive enough to wear a standard membrane, and the CD version for lighter general-purpose duty.

A 1 NO + 1 NC contact rated 15 A at 250 VAC for resistive loads, on both the AD and CD versions. That's enough to drive most relays, alarms and PLC inputs directly, without an interposing relay.