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The Omnitrol Model 610 single stage control and
the Model 710 two stage control are top mounted level
switches of the adjustable differential type and
utilize graphite as standard displacer material.
Graphite, which is an extruded material having no
binders to fail, is virtually indestructible making it
ideal for corrosive application controlling chemical
and petroleum products in wide temperature and
pressure ranges. Because they are of the solid
displacer type they are unaffected by pressures,
leakage, collapsing, or surface agitation, making
them well suited for difficult applications such as
surging or agitated liquids.
With a simple field adjustment, the displacer can
be positioned to any desired elevation below the
mounting connection to open and/or close an
electric or pneumatic switch. The distance
between the on/off or open/close is adjustable from
a minimum of 2-1/2” (in a specific gravity of 1.0)
to the maximum length of the cable, which is
10 feet (standard). Controls may be supplied with
cables up to 75 feet for 600 series controls and 40
feet for 700 series.
The pressure, temperature and specific gravity in
which these controls may be applied is a function
of the selected mounting connection and displacer
assembly. A Model 610 or 710 may be used for
pressures up to 1500 PSIG with standard
construction and with standard displacer options
may be used in specific gravities as low as 0.35
(600 series only). Use table 1 to
find the minimum switching differential for the
desired specific gravity.
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