Reliable Bulk Monitoring with Rotating Vane Switch
The proven rotating vane level switches model NIR-9 from KOBOLD are also available with an ATEX- compliant version with immediate effect. This means that the devices can also be used in dust hazardous areas (zone 21/22) for level monitoring of bulk goods e.g. in chemical, forage and food industry or plastics processing.
A synchronous motor drives a shaft at which a rotating vane is fastened at the lower end. When this rotating vane is decelerated or stopped by bulk solid, the engine moves over the pivoted gear from one end position to the other and thereby switches two micro switches, one shutting down the engine and the other providing an alert signal for display of limit level.
When the level decreases, rotating vanes are released again and the motor is pulled into its primary position by the force of a spring. Thereby the motor is switched on again and working contact is switched back.
The mechanical connection is via flange or screw connection without any problem.