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Flanged External Cage Liquid Level Switches

Brand: Magnetrol
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.

Technology - External Cage Switches

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.

Operating 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.
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 construction
  • Options:
    • 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 modifications
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.

Technology - External Cage Switches

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.

Operating 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.
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 construction
  • Options:
    • 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 modifications

Specifications

Approvals

  • ATEX Ex d, Ex ia
  • CCOE Ex d
  • CSA XP
  • FM XP
  • EAC (GOST) Ex d, Ex ia
  • IEC Ex d, Ex ia
  • INMETRO Ex d
  • Korea Ex d
  • NEPSI Ex d
  • SIL 2

Applications

  • Chemical
    • Catalysis Vessels
    • Chemical Reactors
    • Deionization Tanks
    • Heat Recovery Steam Generator (HRSG) - Power/Utilities
    • Neutralization
    • Scrubber Vessels
    • Surge Drums
  • Common Applications
    • Level: Lubrication Oils & Hydraulic Fluids
    • Level: Process & Field Storage Tanks
  • Crude Oil
    • Crude Desalting
    • Process & Field Storage Tanks
    • Production Fluid Storage
    • Wellstream Separation
  • Natural Gas
    • Flare Knock-Out Drum
    • Gas Dehydration
  • Nuclear Power
    • Containment & Drainage Sumps
    • Emergency Coolant Tanks
    • Liquid Waste Storage
    • Scram Discharge Volume Tanks
    • Spent Fuel Pools
  • Petroleum Refining
    • Catalysis Vessels
    • Crude Desalting
  • Power Generation
    • Boiler Blowdown Tanks
    • Condensate Drip Legs
    • Condensate Receiver Tanks
    • Condensate Storage
    • Deionization Tanks
    • Flash Tanks
    • Heat Recovery Steam Generator (HRSG) - Power/Utilities
    • Preflash Drums
  • Pulp & Paper
    • Black, Green & White Liquor
    • Condensate Receiver Tanks