Datasheet
FIBER
SENSORS
LASER
SENSORS
PHOTO-
ELECTRIC
SENSORS
MICRO
PHOTO-
ELECTRIC
SENSORS
AREA
SENSORS
SAFETY
COMPONENTS
PRESSURE
SENSORS
INDUCTIVE
PROXIMITY
SENSORS
PARTICULAR
USE
SENSORS
SENSOR
OPTIONS
WIRE-
SAVING
SYSTEMS
MEASURE-
MENT
SENSORS
STATIC
CONTROL
DEVICES
LASER
MARKERS
PHOTO-
ELECTRIC
SENSORS
Selection
Guide
Amplifier
Built-in
EX-10
CX-400
EX-20
EX-30
EX-40
EQ-30
EQ-500
MQ-W
RX-LS200
RX
CY
PX-2
RT-610
Amplifier-
separated
Power Supply
Built-in
NX5
VF
SU-7 / SH
SS-A5 / SH
Other
Products
EX-20
Amplifi er
Built-in
277
Ultra-compact Photoelectric Sensor EX-20 SERIES
SENSING CHARACTERISTICS (TYPICAL)
Correlation between lightness and sensing range
N2 N4 N8N6
10
0
20
30
40
0.394
0.787
1.181
1.575
Sensing range L (mm in)
Distance to
convergent point
Sensing region
N2N1 N3 N4 N5 N6 N7 N8 N9
Lightness LightDark
The sensing region (typical) is
represented by oblique lines
in the left fi gure. However, the
sensitivity should be set with
enough margin because of
slight variation in products.
Aluminum-evaporated
mirror
A
luminum plate
White non-glossy
paper
Black-painted
non-glossy plate
Gray non-glossy
paper (N5)
Distance to
conver
g
ent
p
oint
20
0
40
60
80
Stainless steel plate
(SUS304)
0.787
1.575
2.362
3.150
Sensing range L (mm in)
EX-26
□
Convergent refl ective type
The bars in the graph indicate
the sensing range (typical)
for the respective material.
However, there is a slight
variation in the sensing range
depending on the product.
Further, if there is a refl ective
object (conveyor, etc.) in the
background of the sensing
object, since it affects the
sensing, separate it by more
than twice the sensing range
shown in the left graph.
Lightness shown on the left
may differ slightly from the
actual object condition.
Correlation between material (50 × 50 mm 1.969 × 1.969 in) and sensing range
Sensing fi elds
EX-24
□
Convergent refl ective type
Horizontal (left and right) direction
•
ℓ
White non-
glossy paper
L
Sensor
0.51 0 0.5 1
0.0200.039 0.020 0.039
0
5
10
15
20
Operating point ℓ (mm in)
CenterLeft Right
Setting distance L (mm in)
0.197
0.394
0.591
0.787
50 × 50 mm
1.969 × 1.969 in
4.1 mm
0.161 in
Vertical (up and down) direction
•
0.51 0 0.5 1
0
5
10
15
20
Sensor
13.5 mm
0.531 in
ℓ
L
50 × 50 mm 1.969 × 1.969 in
White non-glossy paper
0.0200.039 0.020 0.039
Operating point ℓ (mm in)
CenterLeft Right
Setting distance L (mm in)
0.787
0.591
0.394
0.197
Correlation between lightness and sensing range
Correlation between material (50 × 50 mm 1.969 × 1.969 in) and sensing range
Aluminum-evaporated
mirror
A
luminum plate
White non-glossy
paper
Black-painted
non-glossy plate
Gray non-glossy
paper
(N5)
20
0
40
Sensing range L (mm in)
Stainless steel plate
(SUS304)
1.575
0.787
Distance to conver
g
ent
p
oint
The bars in the graph indicate the
sensing range
(typical)
for the
respective material. However, there
is a slight variation in the sensing
range depending on the product.
Further, if there is a refl ective object
(conveyor, etc.) in the background
of the sensing object, since it
affects the sensing, separate it by
more than twice the sensing range
shown in the left graph, or adjust
the sensitivity adjuster.
The graph is drawn for the
maximum sensitivity setting.
EX-28
□
Narrow-view refl ective type
Sensing fi eld
24024
0.0790.157 0.079 0.157
0
50
100
150
200
1.969
3.937
5.906
7.874
ℓ
L
Sensor
4.1 mm
0.161 in
Operating point ℓ (mm in)
CenterLeft Right
Setting distance L (mm in)
White non-
glossy paper
Black non-glossy paper
Lightness: 6
Approach direction of
black non-glossy paper
100 × 100 mm
3.937 × 3.937 in
Non-glossy paper
Correlation between sensing object size and sensing range
500 100 150 200
1.969 3.937 5.906 7.874
L
a × a mm a × a in
White non-glossy
paper
Sensor
White non-glossy paper
side length a (mm in)
50
100
150
200
1.969
3.937
5.906
7.874
Sensing range L (mm in)
As the sensing object size becomes smaller than the
standard size (white non-glossy paper 100 × 100 mm
3.937 × 3.937 in), the sensing range shortens, as
shown in the left graph.
N2 N4 N8N6
5
0
10
15
20
Sensing range L (mm in)
Distance to convergent point
Sensing region
N2N1 N3 N4 N5 N6 N7 N8 N9
Lightness LightDark
0.197
0.394
0.591
0.787
The sensing region (typical) is
represented by oblique lines
in the left fi gure. However, the
sensitivity should be set with
enough margin because of
slight variation in products.
The graph is drawn for the
maximum sensitivity setting.
Lightness shown on the left
may differ slightly from the
actual object condition.