Standex
Electronics has developed a fluid
level sensor based on conductive
technology that eliminates issues
caused by a second conductive
path that can exist between the
two sensor probes or along the
walls of the container. When a
fluid level drops below the probe
tips a conductive path can still
exist between the two probes,
either along the plastic surfaces
of the sensor itself, or along
the container walls. This becomes
more pronounced over the life
of the sensor as a buildup of
materials occurs on the surfaces
of the sensor and the fluid container
in a humid environment. This can
dramatically affect the sensitivity
of the device, at some point causing
the system to fail. This Standex
sensor introduces a bias ring
charged with an opposing electrical
polarity, which cuts these secondary
conductive paths
and eliminates this sensitivity
change issue.
Applicable
in dirty fluids with substantial
particulate matter.
Capable
of substantial miniaturization.
Relatively
inexpensive.
Available
in two wire and three
wire versions depending
on the application.
Suitable for Washer fluid,
Coolant and other conductive
fluids.
May
be operated in a "pulsing
mode" reducing power
consumption, electrolysis,
and in some applications
eliminating a third wire.
May be operated in an
AC mode eliminating electrolysis
Options:
Mounting
Screw,
Seal Grommet, and custom mounting
arrangements available
Supervision
Can
be equipped with parallel
resistor for circuit supervision
Pulsing
Mode
Available
with internal components
to allow operation in pulsing
mode
