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The Omnitrol Liquid Level Control Model 250 is a
chamber mounted unit designed for a variety of
uses in boiler water level control applications. It
utilizes a unique patented constantly engaged
magnetic field concept which assures a positive
switch in both the rise and fall of liquid levels without
the introduction of springs or other mechanical
devices. Unlike other Omnitrol units, the Model
250 utilizes a stainless steel internal float assembly
rather than a displacer, housed within a cast iron
chamber. It is supplied as standard with a SPDT
mercury switch housed within any of three electrical
enclosures.
As with all Omnitrol liquid level controls, the Model
250 offers patented “snap action” operation based
on the unique and proven principle of a constantly
engaged magnetic field. A typical unit would
have a ceramic magnet assembly which influences the position
of the outer actuator/magnet.
As the float position changes with liquid level the
inner magnet moves up or down within the
magnetic field created by its association with the
outer magnet. When a predetermined level
change is achieved, the inner magnet either pulls
down, or forces the actuator/magnet up causing
a switch opening or closure, depending on
increasing or decreasing liquid level.
All internal switch components are separated from
the process liquid by a non-magnetic corrosion
resistant stainless steel isolation tube.
Common Applications include low-water fuel
cutoff, high water alarm and pump or auxiliary
switch control
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