Displacer Type Level Switch

Description

Displacer level switch is used where High temperature and High Pressure liquid level control is required. It gives Potential free 5A@250VAC 1C/0 or 2C/0 contacts for direct interface to Solenoid Valves, Relays Contractor and Panel Lamps etc.

It consists of a displacer, process flange, spring, enclosure, actuator & micro switch, flexible wire rope. Displacer is designed to suit the specific gravity of liquid. Displacer is connected to a coupler by flexible wire rope through a compression spring.

The level of liquid inside the vessel or tank is indicated by the movement of the displacer. It works on the Archimedes principle.

Displacer moves up & down with the rising or falling liquid level. As the liquid level rises it applies a buoyant force on the coupler in proportion to displaced liquid. It releases the spring & moves the actuator in the magnetic field to actuate the switch. As the liquid level falls spring gets its normal position & the switch releases. Liquid passes into the single case measuring chamber and displaces two tri-gears. Each rotation of a Tri-gear is proportional to a discrete unit of volume, in turn, the speed at which the gears rotate is directly proportional to flow rate. Reed and Hall effect sensors mounted outside the pressure boundary detect the movement of the Tri-gears, thus allowing local or remote instruments to display flow total, rate of flow or facilitate batching applications. Meter can be fitted with additional sensors to provide in phase or out of phase signals for applications such as bidirectional flow.