NMF Membrane Level Monitor for Bulk Goods

Membrane level monitors allow economic level monitoring of bulk goods in storage vessels. They may be used to indicate full and empty states and load demand for dusty, powdery, granulated and grainy bulk goods. They are suitable for use with bulk materials (0.3 to 2.5 t/m3) and particle sizes up to 30 mm. The devices will operate faultlessly provided the bulk goods flow easily at not too small an angle. Only such materials exert sufficient operating pressure on the detector fitted in the wall of the silo.

The housing made of cast aluminium or glass-fibre reinforced plastic carries the membrane retained by a screwed-on ring. With its own weight the bulk material presses against the membrane which is prestressed with a spring through to the support. A plunger fixed to the membrane transfers the pressure directly to a microswitch with changeover contact. If the bulk material subsides, the membrane is relieved and the contact is switched back. The sensitivity can be adjusted with a spring. The monitor can thus be optimised for the type of fill and the installation conditions.