Volume 8—Sensing Solutions CA08100010E—November 2013 www.eaton.com V8-T5-85
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5.8
Photoelectric Sensors
E58 Harsh Duty Series Sensors
Product Overview
E58 Harsh Duty Series Sensors
Physical Attributes
Rugged physical
construction
The E58 Harsh Duty Series
was designed from the
ground up to be the most
rugged sensor family
available. The strong metal
housing, mechanical seals
and surface mount
electronics withstand heavy
shock and vibration. The
tempered glass lens cover
provides protection in
abrasive environments, and
the sturdy cable is physically
clamped to the sensor body.
Exceptional environmental
protection and chemical
resistance
The E58 Harsh Duty Series
was designed to be used
in the automotive, food
processing and forest
products industries. It is also
well suited for applications in
related industries such as
pulp and paper, car wash and
steel. These industries are all
physically demanding on
equipment and that’s why we
designed and tested these
sensors to extreme levels of
shock and vibration.
Many sensor failures,
however, are actually due to
chemical attack so we had to
make them stand up to
constant chemical
exposure—day in and day
out. To ensure resistance to
the widest possible range of
chemicals, we conducted
extensive studies of the
chemical agents commonly
used in these industries.
We then selected only those
materials that could
withstand exposure to these
chemicals without failure in
the design of the E58 Harsh
Duty Series. In addition, we
eliminated adhesives in favor
of more reliable Viton
compression seals. Some of
the more common chemicals
against which this sensor has
been tested are listed in the
resistance chart.
This resistance chart reflects
testing of the 303 stainless
steel body used on the
standard E58 Harsh Duty
Series sensors. Additional
chemical resistance for food
industry applications is
available using sensors with
the optional 316 stainless
steel body and hard-coated
polycarbonate (or acrylic on
reflex models) lens cover.
The E58 Harsh Duty Series
was designed to resist the
chemicals shown in this table
under normal use and
conditions. Extremes of
environmental factors such
as temperature, pressure,
concentration, duration of
exposure, ultraviolet sunlight
and chemical interactions
combined with the presence
of these chemicals could
result in premature material
failure. For these cases,
testing the sensor in the
specific application is
recommended.
E58 Harsh Duty Series
Sensors Chemical
Resistance Chart
Sensing Modes
Perfect Prox
This is a unique type of diffuse
reflective sensor that
combines extremely high
sensing power (called “excess
gain”) with a sharp optical
cutoff to ignore backgrounds.
This allows the sensor to
reliably detect targets
regardless of variations in
color, reflectance, contrast or
surface shape, while ignoring
objects just slightly outside the
target range. With Perfect
Prox, the E58 Harsh Duty
Series can act just like an
inductive prox sensor—but
with up to 20 times the range
for mounting away from a
moving target so you can
avoid damage and downtime.
18 mm and 30 mm sizes, two-,
three- and four-wire circuits,
and cable, micro- and mini-
connector terminations mean
quick and easy replacement of
damaged proximity sensors. A
visible sensing beam lets you
quickly confirm the sensor is
aligned correctly in the
application.
The 18 mm Perfect Prox has
a sensing range of 2 or 4 in
(50 or 100 mm), and the
30 mm version has a range of
6 or 11 in (150 or 280 mm).
This simplified application
example shows the power
of the Perfect Prox.
Application Example
If the hole is present in the
gear, the sensor will shine
through the hole and ignore
the belt—no detection event
will occur.
If the hole in the gear is
missing, the sensor will
detect the surface of the gear
and reject the part.
Thru-Beam
This sensing mode is
available in the 30 mm
models. Rated sensing range
is 800 ft, among the longest
ranges available on the
market. This provides
extremely high excess gain
when the source and
detector are positioned at
closer, optimum ranges to
see through high levels of
contamination. A visible red
sensing beam and wide field-
of-view mean quick and easy
installation and alignment.
Polarized Reflex
Another sensing mode
available in the 30 mm
models is polarized reflex.
In this mode, the sensing
beam is reflected from a
retroreflector back to the
sensor. The maximum range
of 34 ft is also among the
longest available on the
sensor market. The polarizing
filter built into the sensor
ensures only light reflected
off a corner cube
retroreflector is recognized by
the sensor. This allows
reliable detection of shiny
targets that could reflect light
back to the sensor and be
missed by a non-polarized
version. As in all models, a
visible sensing beam is
featured for easy installation
and alignment.
Chemical
Category
Commonly
Found In
Oils, cutting fluids,
aqueous coolants
Automotive,
forest industry
Vegetable and
mineral oil
Automotive,
forest industry
Surfactants Automotive,
food processing
Dilute acids Food processing
Dilute bases Food processing
Sanitizers Food processing
Cutoff
Distance
Detection
Distance
Gear
Cut-away
Perfect Prox Sensor
Detection
Zone