SOR Vertical Displacer Top Mounted Series Level Switch - Manual (Page 2)

2/16 Form 425 (08.12) ©2012 SOR Inc.
Float-Operated Level Switches - Vertical
Operation
 The float rides on the process liquid surface, precisely tracking liquid surface motion.
 Floats are attached to a mechanical linkage. When rising liquid level meets the float,
buoyancy lifts the linkage and positions the attraction sleeve up in the enclosing
tube. Upward movement of the attraction sleeve positions it within the magnetic field
generated by the external magnet.
 Magnetism pulls the external magnet in toward the attraction sleeve, and the external
magnet is tightly engaged against the enclosing tube actuating the switching element.
 When liquid level falls, the attraction sleeve drops out of the magnetic field allowing the
float to pull the magnet away from the enclosing tube, deactuating the switch.
Switching Element
Common
Normally Open
Normally Closed
Pivot
Bias Spring
Magnet
Attraction Sleeve
Enclosing Tube
Float
Level Differential
Actuated
Deactuated
Float-Operated Level Switches - Vertical
NOTE: Float-type level switches are generally able to be used in high-temperature
applications, and sometimes prove useful for close interface detection.
NOTE: Floats are able to operate up to three switching elements. Independent switching
levels can be obtained with tandem fl oats. Consult the factory for special fl oat switching
arrangements.