Cut Sheet

Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com V8-T3-5
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3.0
Inductive Proximity Sensors
Introduction
Extended Range Sensors
Extended range proximity sensors by Eaton’s Electrical Sector offer sensing distances almost three
times greater than conventional devices. They are available in semi-shielded designs: mounted
similar to an embeddable sensor—and non-embeddable designs requiring more metal free zone
area than conventional unshielded sensors. All are available in a variety of circuits and terminations.
Target Material
When manufacturers of
inductive proximity sensors
state the sensing range of
their devices, they are usually
based upon a ferrous target
made of carbon-rolled steel
(IE FE 360)
defined by
ISO630. For example, in
this product guide the
E57P-18SPN5-C2 has a
sensing range of 5 mm based
upon a target of mild steel.
Sensing ranges to targets
made of non-ferrous metals
have to have a correction
factor applied as listed in the
table below. To use this
table, multiply the sensing
distance of the device by
the factor given.
Example: The E57P-18SPN5-C2
has a sensing range of
5 mm. When used to sense
a brass target, the sensing
range becomes 2.25 mm
(5 mm x 0.45).
Table of Correction Factors
Multiply sensing range of device by factor given below.
Correction Factors
Target Size
Often overlooked when
applying sensors is the fact
that the manufacturer’s
stated sensing ranges are
also dependent upon target
size. The table below reflects
the standard target sizes
which were used to
determine sensing ranges.
If targets are the same size
or greater than standard, no
reduction in sensing distance
will occur. However, a
smaller target size will result
in a decrease in sensing
range.
A general rule of thumb is
that the target size shall be
three times the range or the
size of the sensor face,
whichever is larger.
Standard Target Size
1
Note
1
Targets are 1 mm thick.
Sensor Size
Target 4–8 mm 12 mm 18 mm 30 mm Limit Switch
Stainless steel 400 0.90 0.90 1.0 1.0 1.0
Stainless steel 300 0.65 0.70 0.70 0.75 0.85
Brass 0.35 0.45 0.45 0.45 0.5
Aluminum 0.35 0.40 0.45 0.40 0.47
Copper 0.30 0.25 0.35 0.30 0.40
Standard Sensing Range Extended Sensing Range
Target Shielded Devices Unshielded Devices Semi-Shield Devices Non-Embeddable Devices
4 mm 4 mm square 4 mm square — —
5 mm 5 mm square 5 mm square — —
6.5 mm 6.5 mm square 6.5 mm square — —
8 mm 8 mm square 8 mm square — —
12 mm 12 mm square 12 mm square 18 mm square 30 mm square
18 mm 18 mm square 24 mm square 36 mm square 60 mm square
30 mm 30 mm square 45 mm square 66 mm square —
Limit switch 45 mm square 72 mm square — —