S51-PA-5-A00-NK IDEC, S51-PA-5-A00-NK Datasheet - Page 24

Photoelectric Sensor

S51-PA-5-A00-NK

Manufacturer Part Number
S51-PA-5-A00-NK
Description
Photoelectric Sensor
Manufacturer
IDEC
Datasheet

Specifications of S51-PA-5-A00-NK

Output Current
100mA
Sensor Output
NPN
Supply Voltage Range Dc
10V To 30V
Sensor Housing
Cylinder Rotatable
Sensing Range Min
0.1m
Sensor Input
Optical
Sensing Range Max
4m
Switch Terminals
Connector
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Sensors
Slot Sensors
inside of an U-shaped housing. Any target that
passes through the internal slot interrupts the
beam and is detected. Due to their construction,
slot sensors are great for applications with short
operating distances. The most typical slot sensor
applications are hole or teeth detection on gears,
label detection, or edge control and continuity of
sheets or tapes. The emission is generally
infrared light; however visible red or green
emission versions are available and able to detect references such as registra-
tion marks, that present color contrasts on transparent fi lm.
Contrast Sensors
surfaces. This accomplished by
detecting the contrast produced by
the different refl ection degrees. In
this manner a dark reference mark
(low refl ection) can be detected
due to the contrast with a lighter
surface (high refl ection), or vice
versa. In the presence of colored
surfaces, the contrast is highlight-
ed using an LED, typically red or
green. For general purposes a white light is used because the full light spectrum
detects the majority of contrasts. White light emission is obtained through
lamps, or LEDs in most sensors, enabling the detection of very slight contrasts
due to different surface treatments, even of the same material and color.
Contrast sensors are mainly used in automatic packaging machines for registra-
tion mark detection to synchronize folding, cutting and welding.
Mark Color
Red
Orange
Yellow
Green
Blue
Violet
Brown
Black
Gray
White
A slot sensor is a version of a through-beam retro-refl ective sensor,
where the emitter and receiver are
placed opposite each other on the
Contrast sensors (also defi ned as color mark readers) present a
proximity function but, instead of detecting only the presence or
absence of an object, they are able to distinguish between two
Contrast on White Background
Red LED
no
low
low
high
high
medium
low
high
medium
no
Green LED
medium
medium
low
no
medium
high
medium
high
medium
no
White LED
medium
medium
medium
medium
high
high
high
high
medium
yes
USA: 800-262-IDEC
Canada: 888-317-IDEC
Luminescence Sensors
higher wavelength (minor energy) on a
fl uorescent surface, shifting into the
visible light spectrum. Ultraviolet light
emission is obtained using special
lamps, or LEDs in sensors. UV
emission is modulated and the visible
light reception is synchronized.
Maximum immunity against external
interferences, such as refl ections
caused by very shiny surfaces, is
obtained. In addition, fl uorescent targets, invisible to the human eye, can be
detected. Luminescence sensors are used in various industries: detecting labels
on glass or mirrors in pharmaceutical and cosmetic fi elds; selecting tiles marked
with fl uorescent marks in the ceramic industry; determining the presence of
fl uorescent glues on paper for automatic packaging; distinguishing cutting and
sewing guides in textile manufacturing; checking fl uorescent paints or lubricants
in mechanical production.
Color Sensors
the refl ected light’s wave-
length. ‘Saturation’ indicates
the pureness of the color with
respect to white and is
represented as a percentage.
Hue and saturation together
are defi ned as ‘chromaticity’.
Color or chromatic sensors
have a proximity function with
generally three RGB LEDs for
light emission. The color of
an object is identifi ed according to the different refl ection coeffi cients obtained
with red (R), green (G) and blue (B) light emissions. More simply, yellow can be
identifi ed by R=50% G=50% B=0% refl ections; orange by R=75% G=25% B=0%
refl ections; pink by R=50% G=0% B=0% refl ections; but possible combinations
are really infi nite. Color sensors operate only on refl ection ratios and are not in-
fl uenced by light intensity, defi ned as ‘brilliance ‘or ‘luminance’. There is a wide
range of applications, ranging from quality and process controls, to automatic
material handling for identifi cation, orientation and selection of objects accord-
ing to color.
Fiber Optic Sensors
can be thought of as cables that transport light and can be used to place the
sensor’s optics in small spaces, or to detect very small objects.
by Tefl on or Silicon coating. The difference between the core and the coating
refraction indexes allows the light to be diffused inside the fi ber in a guided
manner. The coating is covered by a plastic or metal sheath, which has an exclu-
sively mechanical protection function. Fibers with a glass core and metal sheath
are suitable for very high temperature uses, or for particular mechanical require-
ments. Plastic fi bers, offering great adaptability, are the most diffused in all
An optical fi ber is composed of cylindrical glass (or a plastic core), surrounded
‘Luminescence’ is defi ned as visible light emission from fl uorescent or
phosphorous substances, due to electromagnetic radiation absorption.
Luminescence sensors emit ultraviolet light, which is refl ected at a
The color of an object depends on all the color components of the
incident light which are being refl ected, eliminating those which have
been absorbed. The dominant color is defi ned as ‘hue’ and depends on
Universal functions of through-beam and proximity sensors, as well as
application functions ranging from contrast and luminescence to color
detection, can be obtained using fi ber optic sensors. The optical fi bers
General Information
235

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