Imagem descritiva do produto Flanged external cage liquid level switches

Flanged external cage liquid level switches

Flanged external cage type level switches are completely self-contained units designed for side mounting to a tank or vessel with threaded, socket weld or flanged pipe connections. In hundreds of industrial applications throughout the petroleum refining, petrochemical production and power generation markets, these switches have demonstrated their worth through reliable and repeatable service.

request quote

The product

External cage switches – Technology

A permanent magnet is attached to a pivoted switch actuator. As the float/displacer rises following the liquid level, it raises the attraction sleeve into the field of the magnet, which then snaps against the non-magnetic enclosing tube, actuating the switch. The enclosing tube provides a static pressure boundary between the switch mechanism and the process. On a falling level, the float/displacer deactivates the switch.

Features

Carbon steel float chambers
Stainless steel float and trim
Service pressures up to 900 psig (62 bar)
Process temperatures to +1000 °F (+540 °C)
Specific gravity ratings as low as 0.34
Chamber internals accessible via flange top
Single or multiple switch mechanisms
1″, 1½”, or 2″ tank connections available in either NPT, socket weld, flanged side/side or flanged side/bottom constructionOptions
Dry contact, hermetically sealed and pneumatic switch mechanisms
Choice of switch enclosure
Interface level
Custom materials of construction available upon request
Customized levels and mounting dimensions
Vent and drain connections
High temperature insulation
Extreme temperature modificationsOperating principle

The buoyancy force of a process liquid on the float causes the float to ride on the liquid surface. The movement of the float with the liquid level moves an attraction sleeve into the field of the switch magnet, pulling the magnet toward the sleeve and actuating the switch.