SOR Vertical Displacer Top Mounted Series Level Switch - Manual (Page 4)

4/16 Form 425 (08.12) ©2012 SOR Inc.
Float-Operated Level Switches - Horizontal
Switching Element
Actuated
Magnetic Field
Engaged
Attraction Sleeve Up
Counterweight
Enclosing Tube
Bias Spring
NO Normally Open
NC Normally Closed
C Common
Switching
Element Deactuated
Magnetic Field
Disengaged
Attraction
Sleeve Down
Bias Spring
NO Normally Open
NC Normally Closed
C Common
Level
Differential
Enclosing Tube
Operation
The float rides on the process liquid surface, precisely tracking liquid surface motion.
Rising liquid level lifts the float via a pivot mechanism, sliding the attraction sleeve down
inside the enclosing tube and out of the magnetic field to deactuate the electrical or
pneumatic switch (signaling liquid presence).
Falling Level
The float is connected to a mechanical
linkage which positions the attraction sleeve
up in the enclosing tube when the float is
not supported by liquid.
Positioned at the top of the enclosing tube,
the attraction sleeve is 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.
While the external magnet is held against
the enclosing tube, the switching element is
actuated.
Subsequently, falling liquid level lowers the
float, drawing the attraction sleeve into the
magnetic field to activate the electrical or
pneumatic switch (signaling liquid absence).
Float-Operated Level Switches - Horizontal
Falling
Rising
Rising Level
When the float is supported
by liquid, the float and the
mechanical linkage position the
attraction sleeve down in the
enclosing tube.
Positioned at the bottom of the
enclosing tube, the attraction
sleeve is outside of the magnetic
field generated by the external
magnet.
When the attraction sleeve is
removed from the magnetic field,
the magnetic field is disengaged.
The bias spring snaps the external
magnet away from the attraction
sleeve. The switching element is
deactuated.