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The Omnitrol Model 613 single stage control and
the Model 713 two stage, (Dual Actuator), control
are top mounted level switches of the adjustable
differential type and utilize porcelain as standard
displacer material. Porcelain offers several
advantages such as low cost and high density for
use in applications such as sewage, oils, paints
and foaming and surging liquids. The displacer is
styled, and the surface glazed, to help prevent
adherence of oils and other contaminants
common to applied processes. These controls
have solid displacers which are unaffected by
pressure, leakage, and collapsing. 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 the minimum (tables 1
and 2), to the maximum length of
the cable, which is 10 feet standard. Controls may
be supplied with cables up to 60 feet for 600 series
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. Model 613 or 713 may be used for
pressures up to 1500 PSIG with standard
construction and for specific gravities as low as
0.50, for the 613, and 0.60 for the 713.
Do not use porcelain displacers in closed,
non-vented, boiling water condensate systems
over 200º F (93º C).
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