B73-1B2D-BKQ Datasheet, PDF (1/12 Pages) Magnetrol International, Inc. – B73 & Series 75 Sealed External Cage Liquid Level Switches

B73 & Series 75
Sealed External Cage
Liquid Level Switches
DESCRIPTION
Sealed external cage type level switches are completely
self-contained units designed for side mounting to a tank
or vessel with threaded or flanged pipe connections.
These units are an industry standard in petroleum
refineries and chemical plants. Thousands of these
switches are in daily service throughout the world.
FEATURES
• Carbon steel or stainless steel welded float chamber
• Service pressures up to 2240 psig (154 bar)
• Process temperatures up to +1000° F (+538° C)
• Specific gravity ratings as low as 0.32
• Available switch styles including dry contact,
hermetically sealed and pneumatic
• Single or multiple switch mechanisms available
• Available switch enclosures include:
NEMA 1 carbon steel for pneumatics
TYPE 4X/7/9 Class I, Div. 1 Groups C & D or
Groups B, C & D polymer coated aluminum
• 1", 1¹â„2", or 2" tank connections available in either
NPT, socket weld, flanged side/side or flanged
side/bottom construction
• Optional high temperature insulation available.
See bulletin 41-106.
TECHNOLOGY
A permanent magnet _Πis attached to a pivoted switch
actuator and adjustment screw _. As the float _Ž 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, an inconel spring retracts
the magnet, deactivating the switch.
APPLICATIONS
• Accumulators
• Flash tanks
• Receivers
• Knockout drums
• Flare pots
• Storage tanks
• Scrubbers
• Separators
• Oil refineries
• Chemical processing plants
• Steam and electric generating stations
2
5
Pivot
6
Return
4
Spring
1
3
Process Liquid
Rising Level
Process Liquid
Falling Level