Cut Sheet

V8-T3-50 Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com
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3.6
Inductive Proximity Sensors
AccuProx Analog Sensors
Application Guide
Presenting AccuProx—
Unmatched Analog Range
in a Proven Package
Historically, analog sensors
have been limited by very
short sensing ranges—as
little as one or two
millimeters. By utilizing
technology first perfected in
the iProx family of digital
inductive sensors, AccuProx
can sense objects as far as
25 millimeters. This extended
range can be achieved
without making compromises
often found in competitive
products, such as reduced
output accuracy.
AccuProx utilizes many of
the proven materials found
in other
tubular sensor
families. The threaded barrel
and included mounting nuts
are made of stainless steel,
which exhibits superior
corrosion and abrasion
resistance versus nickel-
plated brass. AccuProx also
features a proprietary internal
potting compound that
absorbs impacts and vibration
while sealing out moisture.
The materials used in the
construction of AccuProx are
time-tested and proven to
work.
High Output Accuracy
Analog inductive sensors are
often used in applications
that require a higher level of
precision than a standard
digital sensor. For example,
applications such as part
inspection require a sensor
that can detect very small
variances. AccuProx has been
designed with these
applications in mind.
Output accuracy is
determined by the repeat
accuracy, linearity, resolution
and response time of the
sensor.
Repeat accuracy refers to the
variations in sensing distance
between successive sensor
operations due to component
tolerances, where all
operating conditions are kept
the same. The repeat
accuracy of an 18 millimeter,
unshielded AccuProx sensor
is less than 20 micrometers.
See the chart below for a
repeat accuracy comparison
of AccuProx versus the
competition.
Linearity refers to the shape of
the output curve. Many
competitive analog sensors
exhibit a wavy or “S-shaped”
output curve. This means that
a change in target distance
may not always translate into
an equivalent change in
output, particularly at the
innermost and outermost
ranges of
a non-linear analog
sensor. AccuProx
features a
linear output. See the
diagram below for an
example of AccuProx
versus a non-linear
competitive offering.
Resolution refers to the
number of
“steps” in the
sensor output. A higher
resolution is ideal because it
will allow the sensor to
detect smaller changes in
target position.
An 18 millimeter, unshielded
AccuProx
features more than
350 output steps, ensuring
consistent performance.
Typical Analog Applications
Material Imperfection or
Blemish Detection
Eccentricity or Absolute
Angle Detection
Saw Blade Deflection
AccuProx
Competitor A
Competitor B
Competitor C
Competitor D
Repeat Accuracy (Less is Better)
AccuProx
Non-linear Sensors
Output
Distance