HAWK Measurement Systems has launched a new level, positioning and flow measurement device for level sensing of low density and potentially-explosive powders.
The rotation switch unit uses a rotating vane as a sensor to detect the level of a dust or powdered material.
The vane is turned slowly by a brushless synchronous motor.
As long as the level of the powder remains below the vane, the vane is free to turn.
If the powder rises to the level of the vane, this stops the rotation.
A switch turns off the synchronous motor and produces an output for an external control system.
The vane sensing system means the rotation switch can be used for powdered materials with low densities (greater than 100 g/l or 6 lb/ft3).
Approximately 80% of all industrial dust materials are potentially explosive, and can be ignited by sparks, high temperatures, static electricity, or electro-magnetic waves.
The switch unit has ATEX and FM approvals for operation in these potentially dangerous environments.
The drive system for the vane includes a friction clutch. This protects the drive gear against any mechanical blows to the vane.
The vane shaft is supported by a high-grade slide bearing with a teflon coating.
The aluminium-coated enclosure is designed to stand up in tough applications (IP66/NEMA4 rating).
Hawk Measurement Systems