The flow-captor 4120 is a unique, precise, metering flow switch with adjustable setpoint for industrial application. For the first time in flow technology it is possible to set an exact flow set-point and to simultaneously measure flow speed in applications where the use of conventional devices is restricted, due to lack of space, or where the price of such devices is not feasible. The simplicity and convenience in operating or adjusting the new flow-captor sets it apart from similar devices.
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.