The NIR-9 level monitor is suitable for wide applications for bulks and solids in silos and hoppers. Regardless of humidity and conductivity of the product, the maximum or minimum level is controlled reliably. Available are different vanes and process connections according to each products and tank size.
A synchronous motor drives a rotating vane that is extended into the tank by means of a shaft. As soon as the bulk reaches the rotating vane, its rotation is blocked. The restoring force moves the pivoted motor away from its original position. Hereby, a micro switch is actuated, which gives out an alarm signal. A second microswitch turns off the motor. If the filling level decreases, the rotating vane is released again and the force of a spring pulls the motor back to its original position. The motor gets turned on again and the working contact is switched back.
The switching sensitivity can be adjusted in three steps by changing the spring position.