Registered Quality System to ISO 9001:2008
5/60
Form 912
sorinc.com
913-888-2630
Actuated Deactuated
Principles
Displacer controls offer alternative features to
the float-operated control. The sensor is a
weight (displacer), heavier than the liquid, that
is suspended by a spring. When liquid contacts
the displacer, a buoyancy force is produced,
which causes the effective weight of the
displacer to change. This causes the spring to
retract slightly to a new equilibrium position.
When the spring retracts, the attraction sleeve
also moves upward into the field of the external
magnet, thus overcoming the force of the bias
spring and actuating the switching element.
This principle provides for narrow or wide
switching differential, and allows switching point
alteration by moving the displacer(s) up or down
the suspension cables.
Displacers may be arranged in combinations
of narrow and wide differential to operate up
to three switching stages. Displacer controls
operate under higher pressure conditions than
float-operated switches.
Displacer-Operated Level Switches
Model Series 700, 730, 740, 750 and 800
Common
Normally Open
Pivot
Magnet
Attraction Sleeve
Enclosing Tube
Displacer
Bias Spring
Normally Closed
Suspension Rod / Cable
Extension Spring
Level
Differential
Mechanical
Level Switches
Switching Element
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