Conductivity is a measure of the ability of a given
substance to conduct electric current, equal to the
reciprocal of the resistance of a substance. This
medium is the most widespread and popular way of
measuring the level of liquid in a tank. Our liquid level
controls can sense a multitude of different liquids (R.O.
water, beer, acids, wine, milk, cheeses, cream,
pharmaceutical products, salt water, etc.).
Lumenite® Conductivity level controls come in
various mounting methods, sizes and relay
configurations and they can be used for sanitary and
industrial applications both indoors and outdoors.
Lumenite® level controls are listed UL-353 (intrinsically
safe) as primary safety devices which also makes
them perfect for the boiler industry and explosive,
Conductivity Level Controls . . .
Lumenite® Capacitance level transmitters can
continuously sense any type of liquid from conductive
acids to non-conductive oils. It can also sense moist
granular solids and provide a full 4-20mA output and
continuous percentage of tank full.
The Capacitance principal of level measurement
says the output signal in milliamps is dependent on
the formula : Dielectric Constant * Area of Parallel
Plates ÷ Distance Between Parallel Plates or C=KA/D.
In a level measurement application, the dielectric
constant “K” is a value greater than 1. The value “A”
is dependent on the diameter and length the level
probe. The value “D” is the distance from the probe
to the tank wall, ground reference probe or concentric
tube. Consequently, capacitance (C) and the
resultant mA output increases as the dielectric
constant increases, the probe diameter and length
increases, and the distance from the probe to tank
wall (ground probe or tube), decreases.
Capacitance Level Controls . . .
Lumenite® Control Technology, Inc.
Engineers • Designers • Manufacturers
Lumenite® Control Technology, Inc
2331 N 17th Ave.
Franklin Park, IL 60131 U.S.A.
Phone : 847-455-1450
E-Mail : firstname.lastname@example.org
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