Cylindrical Proximity Sensor
E2K-X
General-purpose Threaded Sensor
That Detects Metals and Non-metals
Alike
■ Detects both metallic and nonmetallic objects (water, oil,
glass, plastic, etc.).
■ Three choices of threaded cylinder sizes for easy
installation: M12, M18, and M30.
■ Fixed sensing distance requires no sensitivity adjustment.
Be sure to read Safety Precautions on
page 5.
Ordering Information
Sensors
Model
Appearance
Sensing distance
Output configuration
Operation mode
NO
M12
4 mm
Unshielded
M18
8 mm
M30
15 mm
NC
DC 3-wire, NPN
E2K-X4ME1
E2K-X4ME2
AC 2-wire
E2K-X4MY1
E2K-X4MY2
DC 3-wire, NPN
E2K-X8ME1
E2K-X8ME2
AC 2-wire
E2K-X8MY1
E2K-X8MY2
DC 3-wire, NPN
E2K-X15ME1
E2K-X15ME2
AC 2-wire
E2K-X15MY1
E2K-X15MY2
Accessories (Order Separately)
Mounting Brackets
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1
E2K-X
Ratings and Specifications
Item
E2K-X4ME@,
E2K-X4MY@
Model
E2K-X8ME@,
E2K-X8MY@
E2K-X15ME@,
E2K-X15MY@
Sensing distance
4mm 10%
8 mm 10%
15 mm 10%
Set distance *1
0 to 2.8 mm
0 to 5.6 mm
0 to 10 mm
Differential travel
4% to 20% of sensing distance
Detectable object
Conductors and dielectrics
Standard sensing object
Grounded metal plate: 50 50 1 mm
Response frequency
E Models: 100 Hz, Y Models: 10 Hz
Power supply voltage*2
(operating voltage range)
E Models: 12 to 24 VDC (10 to 30 VDC)
Y Models: 100 to 220 VAC (90 to 250 VAC)
Current consumption
E Models: 15 mA max.
Leakage current
Control
output
Y Models: 2.2 mA max. (Refer to page 4.)
Load current
E Models: 200 mA max.*2, Y Models: 10 to 200 mA
Residual voltage E Models: 1 V max. (Load current: 200 mA, Cable length: 2 m), Y Models: Refer to Engineering Data on page 4.
Indicators
E Models: Detection indicator (red), Y Models: Operation indicator (red)
Operation mode
(with sensing object
approaching)
E1/Y1 Models: NO
E2/Y2 Models: NC
Protection circuits
E Models: Reverse polarity protection, Surge suppressor, Y Models: Surge suppressor
Ambient temperature
range
Operating/Storage: 25 to 70C (with no icing or condensation)
Ambient humidity range
Operating/Storage: 35% to 95% (with no condensation)
Temperature influence
20% max. of sensing distance at 23C in the operating temperature range
Voltage influence
E Models: 2% max. of sensing distance at rated voltage at rated voltage 20%
Y Models: 2% max. of sensing distance at rated voltage at rated voltage 10%
Insulation resistance
50 M: min. (at 500 VDC) between current-carrying parts and case
Dielectric strength
E Models: 1,000 VAC, 50/60 Hz for 1 min between current-carrying parts and case
Y Models: 2,000 VAC, 50/60 Hz for 1 min between current-carrying parts and case
Vibration resistance
Destruction: 10 to 55 Hz, 1.5-mm double amplitude for 2 hours each in X, Y, and Z directions
Shock resistance
Destruction: 500 m/s2 3 times each in X, Y, and Z directions
Degree of protection
IP66 (IEC), in-house standards: oil-resistant
Connection method
Pre-wired Models (Standard cable length: 2 m)
Weight (packed state)
Approx. 65 g
Case
Materials
Sensing surface
Clamping nuts
Accessories
Refer to the timing charts under I/O Circuit Diagrams on page 4 for details.
Approx. 145 g
Operating/Storage: 10 to 55C
(with no icing or condensation)
Approx. 205 g
Heat-resistant ABS
Polyacetal
Tightening tool, Instruction Manual
Instruction manual
*1. The above values are sensing distances for the standard sensing object. Refer to Engineering Data on page 3 for other materials.
*2. E Models (DC switching models): A full-wave rectification power supply of 24 VDC 20% (average value) can be used.
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2
E2K-X
Engineering Data (Typical)
Sensing Area (Grounded Metal Plate)
Distance X (mm)
E2K-X4M
18
16
14
E2K-X15M
Y
X
12
10
8
Standard sensing
object Grounded
metal plate
50 × 50 × 1 mm
E2K-X8M
6
4
E2K-X4M
2
0
−5 −20 −15 −10 −5
0
5
10
15
E2K-X4M Sensing
20 25
Distance
Y (mm)
E2K-X8M Sensing Head
E2K-X15M Sensing Head
Influence of Sensing Object Size and Material
d×
d
t = 3 mm
X
Grounded metal
4
3
10
d×
d
E2K-X15M
t = 3 mm
X
Grounded metal
8
Distance X (mm)
5
E2K-X8M
Distance X (mm)
Distance X (mm)
E2K-X4M
6
25
d×
d
t = 3 mm
X
20
Grounded metal
15
Non-grounded metal
Non-grounded metal
Non-grounded metal
2
4
10
Glass
Glass
1
2
Glass
0
Acryl
Acryl
Phenol
20
30
40
50
60
70
Side length of sensing object: d (mm)
10
Phenol
5
Phenol
0
10
20
30
40
50
60
70
0
10
20
Side length of sensing object: d (mm)
30
40
50
60
70
Side length of sensing object: d (mm)
Sensing Object Thickness and Material vs. Sensing Distance
4
Grounded metal
50 ×
50
3
X
t
E2K-X15M
10
8
Grounded metal
50 ×
50
X
t
6
Distance X (mm)
E2K-X8M
5
Distance X (mm)
Distance X (mm)
E2K-X4M
25
20
50 ×
50
X
t
Grounded metal
15
Non-grounded metal
Non-grounded metal
Non-grounded metal
Glass
4
2
10
Acryl
2
1
5
Phenol
0
5
10
15
20
Glass
Phenol
Phenol
Glass
Acryl
25
Thickness of sensing object: t (mm)
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0
5
10
15
20
25
Thickness of sensing object: t (mm)
0
5
10
15
20
25
Thickness of sensing object: t (mm)
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3
E2K-X
E2K-X@MY@
1.5
Protective resistance
mA
V
at 100 VAC
120
E2K-X@MY@
Load voltage VL (V)
2.0
Load voltage VL (V)
Residual Output Voltage
E2K-X@MY
Leakage current (mA)
Leakage Current
Residual output voltage
100
ON
80
240
Residual output voltage
200
ON
160
V
AC
power,
50/60Hz
V
60
120
VL
VL
(OFF)
1.0
40
100 VAC
A
100
40
0
3
200
300
Power supply voltage (V)
Residual
Load Voltage
5
10
OFF
20
30
200 VAC
80
20
0
at 200 VAC
0
3
50
100 200
Load current (mA)
A
Residual
Load
Voltage
5
10
20
30
50
100
OFF
200
Load current (mA)
I/O Circuit Diagrams
DC 3-Wire Models
Operation
mode
Model
Timing chart
Output circuit
Present
Sensing object
Not present
NO
E2K-X4ME1
E2K-X8ME1
E2K-X15ME1
Load (between brown
and black leads)
Operate
Brown
Reset
High
Output voltage (between
black and blue leads)
+V
100 Ω
Low
ON
Detection indicator (red)
OFF
Load
Proximity
Sensor
main
circuit
4.7 kΩ
Black*1
2.2 Ω
Output*2
Tr
Present
Sensing object
Blue
Not present
NC
E2K-X4ME2
E2K-X8ME2
E2K-X15ME2
Load (between brown
and black leads)
0V
Operate
Reset
High
Output voltage (between
black and blue leads)
*1. Load current: 200 mA max.
*2. When a transistor is connected.
Low
ON
Detection indicator (red)
OFF
AC 2-Wire Models
Operation
mode
Model
Timing chart
Sensing object
NO
E2K-X4MY1
E2K-X8MY1
E2K-X15MY1
Output circuit
Present
Not present
Load
Operate
Brown
Reset
Operation indicator (red)
Load
ON
OFF
Proximity
Sensor
main
circuit
Blue
Sensing object
NC
E2K-X4MY2
E2K-X8MY2
E2K-X15MY2
Present
Not present
Load
Operate
Reset
Operation indicator (red)
ON
OFF
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4
E2K-X
Safety Precautions
Refer to Warranty and Limitations of Liability.
WARNING
Sensing Objects
This product is not designed or rated for ensuring
safety of persons either directly or indirectly.
Do not use it for such purposes.
Precautions for Correct Use
Do not use this product under ambient conditions that exceed the
ratings.
● Design
Ambient Environment
The Sensor may malfunction if subjected to water, oil, chemicals, or
condensation by falsely detecting these as sensing objects.
The E2K-X15M is highly sensitive to inductive objects and can thus
be affected even by small quantities of water drops.
Influence of Surrounding Objects
If the Sensor is embedded in metal, maintain at least the following
distances between the Sensor and the metal. The Sensor is also
affected by other materials, such as resins. Separate the Sensor from
other materials by the same distance as for metal.
l
Metal object
* Be sure to ground the metal object, otherwise Sensor operation will not be
stable.
Influence of Surrounding Metal
Dimension
l
20
(Unit: mm)
d
m
n
50
8
12
25
60
10
If a mounting bracket is used, be sure that at least the following
distances are maintained.
Influence of Surrounding Metal
Dimension
E2K-X4M
E2K-X8M
E2K-X15M
G
20
Mounting
Do not tighten the nut with excessive force. Always use washers when
tightening the nuts and do not exceed the torque in the following table.
E2K-X4M
E2K-X8M
E2K-X15M
Torque
0.78 N·m
2 N·m
Note: A special tightening tool is provided with the E2K-X4M@@. Always use
this tool to tighten the nuts.
● Miscellaneous
Organic Solvents
The Sensor has a case made of heat-resistant ABS resin. Be sure
that the case is free from organic solvents or solutions containing
organic solvents.
G
(Unit: mm)
Model
The E2K-X may malfunction if there is an ultrasonic washer, highfrequency generator, transceiver, or inverter nearby.
For major measures, refer to Noise of Warranty and Limitations of
Liability for Photoelectric Sensors.
Model
*
Be sure to ground.
E2K-X4M
E2K-X8M
E2K-X15M
Effects of a High-frequency Electromagnetic Field
m
n
d dia.
Model
The maximum sensing distance will decrease if the sensing object is
a non-grounded metal object or dielectric object.
x Sensing Object Material
The E2K-X can detect almost any type of object. The sensing
distance of the E2K-X, however, will vary with the electrical
characteristics of the object, such as the conductance and
inductance of the object, and the water content and capacity of the
object. The maximum sensing distance of the E2K-X will be
obtained if the object is made of grounded metal.
x There are objects that cannot be detected indirectly. Therefore, be
sure to test the E2K-X in a trial operation with the objects before
using the E2K-X in actual applications.
H
H
30
10
Mutual Interference
When installing Sensors face-to-face or side-by-side, ensure that the
minimum distances given in the following table are maintained.
B
A
Mutual Interference
Model
Dimension
E2K-X4M
E2K-X8M
E2K-X15M
(Unit: mm)
A
B
80
150
300
70
110
200
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5
E2K-X
Dimensions
(Unit: mm)
E2K-X8ME@
E2K-X8MY@
E2K-X4ME@
E2K-X4MY@
80
21 dia.
80
29 dia.
60
60
17
20
4
24
Indicator *2
4
20
Indicator *2
4 4
10.7 dia.
16.6 dia.
*1
*1
M12 × 1
Two clamping nuts
Two washers
M18 × 1
*1. E Models: 4-dia. vinyl-insulated round cable with 3 conductors
(Conductor cross section: 0.2 mm2, Insulator diameter: 1.2 mm),
Standard length: 2 m
Y Models: 4-dia. vinyl-insulated round cable with 2 conductors
(Conductor cross section: 0.3 mm2, Insulator diameter: 1.3 mm),
Standard length: 2 m
*2. E Models: Detection indicator (red)
Y Models: Operation indicator (red)
Two clamping nuts
Two washers
*1. E Models: 6-dia. vinyl-insulated round cable with 3 conductors
(Conductor cross section: 0.5 mm2, Insulator diameter: 1.9 mm),
Standard length: 2 m
Y Models: 6-dia. vinyl-insulated round cable with 2 conductors
(Conductor cross section: 0.5 mm2, Insulator diameter: 1.9 mm),
Standard length: 2 m
*2. E Models: Detection indicator (red)
Y Models: Operation indicator (red)
Mounting Hole Dimensions
E2K-X15ME@
E2K-X15MY@
F
80
Model
E2K-X4ME@
E2K-X4MY@
E2K-X8ME@
E2K-X8MY@
E2K-X15ME@
E2K-X15MY@
F (mm)
+0.5
12.5 0
+0.5
18.5 0
+0.5
30.5 0
dia.
dia.
dia.
60
42 dia.
36
10
5
5
Indicator *2
28.1 dia.
*1
M30 × 1.5
Two clamping nuts
Two washers
*1. E Models: 6-dia. vinyl-insulated round cable with 3 conductors
(Conductor cross section: 0.5 mm2, Insulator diameter: 1.9 mm),
Standard length: 2 m
Y Models: 6-dia. vinyl-insulated round cable with 2 conductors
(Conductor cross section: 0.5 mm2, Insulator diameter: 1.9 mm),
Standard length: 2 m
*2. E Models: Detection indicator (red)
Y Models: Operation indicator (red)
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6
Proximity Sensors Technical Guide
General Precautions
For precautions on individual products, refer to the Safety Precautions in individual product information.
WARNING
These products cannot be used in safety devices for
presses or other safety devices used to protect human
life.
These products are designed for use in applications for
sensing workpieces and workers that do not affect safety.
Precautions for Safe Use
To ensure safety, always observe the following precautions.
●Wiring Considerations
Item
Power Supply Voltage
Do not use a voltage that exceeds the operating voltage range. Applying a voltage that is
higher than the operating voltage range, or using an AC power supply (100 VAC or higher)
for a Sensor that requires a DC power supply
may cause explosion or burning.
Load short-circuiting
Typical examples
DC 3-Wire NPN Output Sensors
DC 2-Wire Sensors
Load
Brown
Sensor
Load
Brown
Sensor
Black
Blue
Blue
• DC 2-Wire Sensors
• Even with the load short-circuit protection
function, protection will not be provided when
a load short circuit occurs if the power supply
polarity is not correct.
DC 3-Wire NPN Output Sensors
• Do not short-circuit the load. Explosion or
burning may result.
• The load short-circuit protection function operates when the power supply is connected
with the correct polarity and the power is
within the rated voltage range.
Load
Load
Brown
Sensor
Black
(Load short +
circuit)
−
Brown
Be sure that the power supply polarity and other wiring is correct. Incorrect wiring may cause
explosion or burning.
Blue
DC 3-Wire NPN Output Sensors
Load
Brown
Sensor
−
Black
+
If the power supply is connected directly without a load, the internal elements may explode
or burn. Be sure to insert a load when connecting the power supply.
Brown
Sensor
Load
Blue
+
−
Black
Blue
Connection without a Load
−
+
Sensor
Blue
Incorrect Wiring
(Load short circuit)
• DC 2-Wire Sensors
• Even with the load short-circuit protection
function, protection will not be provided if
both the power supply polarity is incorrect
and no load is connected.
AC 2-Wire Sensors
Brown
Sensor
Brown
−
+
Sensor
Blue
Blue
●Operating Environment
Do not use the Sensor in an environment where there are explosive or combustible gases.
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C-1
Proximity Sensors Technical Guide
Precautions for Correct Use
The following conditions must be considered to understand the conditions of the application and location as well as the relation to control
equipment.
●Model Selection
Item
Points of consideration
Specific condiDirection of obtions of object
ject movement
Check the relation between the sensing object
and the Proximity Sensor.
Sensing
object and
operating
condition of
Proximity
Sensor
Material, size,
shape, existence
of plating, etc.
Sensing object
Material, distance Fluctuation in tranto Sensor, orien- sit point, allowable
error, etc.
tation, etc.
Sensing (set) distance, shape of Sensor (rectangular, cylindrical, throughbeam, grooved), influence of peripheral metal (Shielded Sensors, Nonshielded Sensors), response speed (response frequency), influence of
temperature, influence of voltage, etc.
Surrounding
metals
Output
Load
Power
supply
Switching element
Proximity
Sensor
Verify the electrical conditions of the control system
Power
to be used and the electrical performance of the
supply
Proximity Sensor.
Load
DC (voltage fluctuation, current capacity value)
AC (voltage fluctuation, frequency, etc.)
Need for S3D2 Controller
Selecting the power
supply type
DC
DC + S3D2 Controller
AC
Resistive load - Non-contact control system
Inductive load - Relay, solenoid, etc.
• Steady-state current, inrush current
• Operating, reset voltage (current)
Lamp load
• Steady-state current, inrush current
Open/close frequency
Selecting the power
supply type
DC
DC + S3D2 Controller
AC
Control output
Maximum current
(voltage)
Leakage current
Residual load voltage
{
{
• Water Resistance
Do not use the Sensor in water, rain, or outdoors.
The environmental tolerance of the Proximity Sensor
is better than that of other types of Sensors. However,
investigate carefully before using a Proximity Sensor
under harsh temperatures or in special atmospheres.
Environmental
conditions
Sensing distance
Sensing
distance
Proximity Sensor
Electrical
conditions
Transit interval,
speed, existence
of vibration, etc.
Peripheral metal
• Ambient Conditions
To maintain reliability of operation, do not use the
Temperature Highest or lowest Temperature influence, Sensor outside the specified temperature range or
and humidity values, existence high-temperature use, outdoors. Even though the Proximity Sensor has a
of direct sunlight, low temperature use, water-resistant structure, it must be covered to preetc.
need for shade, etc.
vent direct contact with water or water-soluble cutting
oil. Do not use the Sensor in atmospheres with chemNeed for water resis- ical vapors, in particular, strong alkalis or acids (nitric
Atmosphere Water, oil, iron
tance or oil resistance, acid, chromic acid, or hot concentrated sulfuric acid).
powder, or other
special chemicals need for explosionproof structure
• Explosive Atmospheres
Do not use the Sensor in atmospheres where
Vibration and Size, duration
Need for strength,
there is a danger of explosion. Use an Explosionshock
mounting method
proof Sensor.
When deciding the mounting method, take into consideration not
only restrictions due to mechanical devices, but also ease of maintenance and inspection, and interference between Sensors.
Mounting
conditions
Wiring method,
existence of inductance surges
Connection
Wires
Wire type, length, oil-resistant
cable, shielded cable, robot
cable, etc.
Mounting procedure
Installation location
Conduits, ducts, pre-wired,
terminal wiring, ease of maintenance and inspection
Existence of mounting
brackets, direct mounting,
secured with bolts or screws
Ease of maintenance and
inspection, mounting space
Influence of
external
electromagnetic fields
• The influence within a DC magnetic field is 20 mT* max. Do not use the Sensor at a level higher than 20 mT.
• Sudden changes in the DC magnetic field may cause malfunction. Do not use the Sensor for applications that involve turning a
DC electromagnet ON and OFF.
• Do not place a transceiver near the Sensor or its wiring. Doing so may cause malfunction.
Other considerations
Cost feasibility: Price/delivery time
Life: Power-ON time/frequency of use
* mT (millitesla) is a unit for expressing magnetic flux density. One tesla is the equivalent of 10,000 gauss.
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C-2
Proximity Sensors Technical Guide
●Design
Sensing Object Material
Sensing distance X (mm)
8
Stainless steel
6
Brass
4
Aluminum
2
0
Copper
5 10 15 20 25 30 35 40 45 50 55
Side length (one side) of sensing object: d (mm)
Size of Sensing Object
• Influence of Plating If the
sensing object is plated, the
sensing distance will change
(see the table below).
Side length (one side)
of sensing object: d (mm)
Sensing Standard Stability
distance sensing
becomes object
short
Sensing object shape: Square
d=30mm
Reset
Operate
10
Steel
8
6
4
2
Aluminum
0 0.01
0.1
1
10
Thickness of sensing object: t (mm)
Effect of Plating (Typical)
(Reference values: Percent of non-plated sensing distance)
Thickness and base material of
plating
No plating
Sensing distance X (mm)
In general, if the object is smaller
than the standard sensing
object, the sensing distance
decreases.
• Design the setup for an object
size that is the same or greater
than the standard sensing
object size from the graphs
showing the sensing object
size and sensing distance.
• When the size of the standard
sensing object is the same or
less than the size of the
standard sensing object,
select a sensing distance with
sufficient leeway.
• The thickness of ferrous metals
(iron, nickel, etc.) must be 1 mm
or greater.
• When the coating thickness is
0.01 mm or less, a sensing
distance equivalent to a
magnetic body can be obtained.
When the coating is extremely
thin and is not conductive, such
as a vacuum deposited film,
detection is not possible.
Sensing distance X (mm)
Thickness of Sensing Object
The sensing distance varies greatly depending on the material of the
sensing object. Study the engineering data for the influence of
sensing object material and size and select a distance with sufficient
leeway.
• In general, if the
Example: E2-X10D@
sensing object is a non14
t=1mm
X
magnetic metal (for
12
d
example, aluminum),
the sensing distance
Steel
10
decreases.
(SPCC)
Steel
Brass
100
100
Zn 5 to 15 μm
90 to 120
95 to 105
Cd 5 to 15 μm
100 to 110
95 to 105
Ag 5 to 15 μm
60 to 90
85 to 100
Cu 10 to 20 μm
70 to 95
95 to 105
Cu 5 to 15 μm
-
95 to 105
Cu (5 to 10 μm) + Ni (10 to 20 μm)
70 to 95
-
Cu (5 to 10 μm) + Ni (10 μm)
+ Cr (0.3 μm)
75 to 95
-
Mutual Interference
• Mutual interference refers to a state where a Sensor is affected by
magnetism (or static capacitance) from an adjacent Sensor and the
output is unstable.
• One means of avoiding interference when mounting Proximity
Sensors close together is to alternate Sensors with different
frequencies. The model tables indicate whether different
frequencies are available. Please refer to the tables.
• When Proximity Sensors with the same frequency are mounted
together in a line or face-to-face, they must be separated by a
minimum distance. For details, refer to Mutual Interference in the
Safety Precautions for individual Sensors.
Power Reset Time
A Sensor is ready for detection within 100 ms after turning ON the
power. If the load and Sensor are connected to separate power
supplies, design the system so that the Sensor power turns ON first.
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C-3
Proximity Sensors Technical Guide
Turning OFF the Power
An output pulse may be generated when the power is turned OFF, so
design the system so that the load or load line power turns OFF first.
Influence of Surrounding Metal
Countermeasures for Leakage Current (Examples)
AC 2-Wire Sensors
Connect a bleeder resistor to bypass the leakage current flowing in
the load so that the current flowing through the load is less than the
load reset current.
The existence of a metal object other than the sensing object near the
sensing surface of the Proximity Sensor will affect detection performance, increase the apparent operating distance, degrade temperature characteristics, and cause reset failures. For details, refer to the
influence of surrounding metal table in Safety Precautions for individual Sensors.
The values in the table are for the nuts provided with the Sensors.
Changing the nut material will change the influence of the surrounding
metal.
Power Transformers
Be sure to use an insulated transformer for a DC power supply. Do
not use an auto-transformer (single-coil transformer).
Precautions for AC 2-Wire/DC 2-Wire Sensors
Surge Protection
Although the Proximity Sensor has a surge absorption circuit, if there
is a device (motor, welder, etc.) that causes large surges near the
Proximity Sensor, insert a surge absorber near the source of the
surges.
Influence of Leakage Current
Even when the Proximity Sensor is OFF, a small amount of current
runs through the circuit as leakage current.
For this reason, a small current may remain in the load (residual
voltage in the load) and cause load reset failures. Verify that this
voltage is lower than the load reset voltage (the leakage current is
less than the load reset current) before using the Sensor.
Using an Electronic Device as the Load for an AC 2-Wire
Sensor
When using an electronic device, such as a Timer, some types of
devices use AC half-wave rectification. When a Proximity Sensor is
connected to a device using AC half-wave rectification, only AC halfwave power will be supplied to the Sensor. This will cause the Sensor
operation to be unstable. Also, do not use a Proximity Sensor to turn
the power supply ON and OFF for electronic devices that use DC halfwave rectification. In such a case, use a relay to turn the power supply
ON and OFF, and check the system for operating stability after
connecting it.
Examples of Timers that Use AC Half-wave Rectification
Timers: H3Y, H3YN, H3RN, H3CA-8, RD2P, and H3CR (-A, -A8, -AP,
-F, -G)
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When using an AC 2-Wire Sensor, connect a bleeder
resistor so that the Proximity Sensor current is at least 10
mA, and the residual load voltage when the Proximity
Sensor is OFF is less than the load reset voltage.
Load
AC power supply
voltage Vs
Bleeder resistor R
Calculate the bleeder resistance and allowable power using the
following equation.
Vs
R≤
10 - I
P
I
(kΩ)
P>
Vs2
(mW)
R
: Watts of bleeder resistance (the actual number of watts
used should be several times this number)
: Load current (mA)
It is recommend that leeway be included in the actual values used.
For 100 VAC, use 10 kΩ or less and 3 W (5 W) or higher, and for 200
VAC, use 20 kΩ or less and 10 W (20 W) or higher. If the effects of
heat generation are a problem, use the number of watts in
parentheses ( ) or higher.
DC 2-Wire Sensors
Connect a bleeder resistor to bypass the leakage current flowing in
the load, and design the load current so that (leakage current) × (load
input impedance) < reset voltage.
Load
Bleeder resistor R
Vs
Calculate the bleeder resistance and allowable power using the
following equation.
Vs
R≤
iR - iOFFR
(kΩ)
P>
Vs2
R
(mW)
P
: Watts of bleeder resistance (the actual number of watts
used should be several times this number)
iR : Leakage current of Proximity Sensor (mA)
iOFF : Load reset current (mA)
It is recommend that leeway be included in the actual values used.
For 12 VDC, use 15 kΩ or less and 450 mW or higher, and for 24
VDC, use 30 kΩ or less and 0.1 W or higher.
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C-4
Proximity Sensors Technical Guide
Loads with Large Inrush Current
Loads, such as lamps or motors, that cause a large inrush current* will
weaken or damage the switching element. In this situation, use a
relay.
• While pressing the Amplifier Unit in the direction of (3), lift the fiber
plug in the direction of (4) for easy removal without a screwdriver.
* E2K, TL-N@Y: 1 A or higher
●Mounting
Mounting the Sensor
(4)
When mounting a Sensor, do not tap it with a hammer or otherwise
subject it to excessive shock. This will weaken water resistance and
may damage the Sensor. If the Sensor is being secured with bolts,
observe the allowable tightening torque. Some models require the
use of toothed washers.
For details, refer to the mounting precautions in Precautions for
Correct Use in individual product information.
DIN Track (3)
Set Distance
The sensing distance may vary due to fluctuations in temperature and
voltage. When mounting the Sensor, it is recommend that installation
be based on the set distance.
Mounting/Removing Using DIN Track
(Example for E2CY)
(1)Insert the front of the Sensor into the special Mounting Bracket
(included) or DIN Track.
(2)Press the rear of the Sensor into the special Mounting Bracket or
DIN Track.
Rear
Front
(1)
(2)
Mounting track (yellow)
DIN Track (or Mounting Bracket)
• When mounting the side of the Sensor using the special Mounting
Bracket, first secure the Amplifier Unit to the special Mounting
Bracket, and then mount the special Mounting Bracket with M3
screws and flat washers with a diameter of 6 mm maximum.
Flat washers (6 dia. max.)
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(c)Copyright OMRON Corporation 2007 All Rights Reserved.
C-5
Proximity Sensors Technical Guide
●Wiring Considerations
AND/OR Connections for Proximity Sensors
Model
Type of
connection
Connection
Description
Load
Keep the number of connected Sensors (N) within the range of the following
equation.
VS - N × VR ≥ Operating load voltage
+
-
AND (series
connection)
Vs
+
It is possible, however, that the indicators may not light correctly and error
pulses (of approximately 1 ms) may be generated because the rated power
supply voltage and current are not supplied to individual Proximity Sensors.
Verify that this is not a problem before operation.
-
DC 2-Wire
Load
+
Vs
OR (parallel
connection)
N : Number of Sensors that can be connected
VR: Residual output voltage of Proximity Sensor
VS: Power voltage
Keep the number of connected Sensors (N) within the range of the following
equation.
N × i ≤ Load reset current
N: Number of Sensors that can be connected
i: Leakage current of Proximity Sensor
+
Example: When an MY (24-VDC) Relay is used as the load, the maximum number
of Sensors that can be connected is 4.
The above Proximity Sensors cannot be used in a sereis connection. If needed, connect through relays.
Load
VS
X2
X1
AND (series
connection)
Load
X1
VS
X2
Load
For the above Proximity Sensors, the voltage VL that can be applied to the
load when ON is VL = VS - (Output residual voltage × Number of Sensors), for
both 100 VAC and 200 VAC.
The load will not operate unless VL is higher than the load operating voltage.
This must be verified before use.
When using two or more Sensors in series with an AND circuit, the limit is three
Sensors. (Be careful of the VS value in the diagram at left.)
VL
VS
VS ≥ 100V
AC 2-wire
In general it is not possible to use two or more Proximity Sensors in parallel
with an OR circuit.
(B)
OR (parallel
connection)
A parallel connection can be used if A and B will not be operated simultaneously and there is no need to hold the load. The leakage current, however,
will be n times the value for each Sensor and reset failures will frequently occur.
("n" is the number of Proximity Sensors.)
Load
X1
X2
(A)
Load
(B)
X1 X2
AC power supply
voltage Vs
(A)
If A and B will be operated simultaneously and the load is held, a parallel connection is not possible.
If A and B operate simultaneously and the load is held, the voltages of both A
and B will fall to about 10 V when A turns ON, and the load current will flow
through A causing random operation. When the sensing object approaches B,
the voltage of both terminals of B is too low at 10 V and the switching element
of B will not operate. When A turns OFF again, the voltages of both A and B
rise to the power supply voltage and B is finally able to turn ON.
During this period, there are times when A and B both turn OFF (approximately
10 ms) and the loads are momentarily restored. In cases where the load is to
be held in this way, use a relay as shown in the diagram at left.
Note: When AND/OR connections are used with Proximity Sensors, the effects of erroneous pulses or leakage current may prevent use. Verify that there are no
problems before use.
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(c)Copyright OMRON Corporation 2007 All Rights Reserved.
C-6
Proximity Sensors Technical Guide
Model
Type of
connection
Connection
(A)
AND (series
connection)
(B)
+
+
Description
Keep the number of connected Sensors (N) within the range of the following
equation.
iL + (N - 1) × i ≤ Upper limit of Proximity Sensor control output
VS - N × VR ≥ Operating load voltage
i
OUT
iL
Load
i
Vs
OUT
Example: A maximum of two
Sensors can be used when an
MY (24-VDC) Relay is used for
the load.
Note: When an AND circuit is connected, the operation of Proximity Sensor B
causes power to be supplied to Proximity Sensor A, and thus erroneous
pulses (approximately 1 ms) may be generated in A when the power is
turned ON. For this reason, take care when the load has a high
response speed because malfunction may result.
-
DC 3-wire
N : Number of Sensors that can be connected
VR: Residual output voltage of Sensor
VS: Power supply voltage
i : Current consumption of Sensor
iL: Load current
+
OUT
OR (parallel
connection)
Load
Vs
+
OUT
For Sensors with a current output, a minimum of three OR connections is possible. Whether or not four or more connections is possible depends on the
model.
Note: When AND/OR connections are used with Proximity Sensors, the effects of erroneous pulses or leakage current may prevent use. Verify that there are no
problems before use.
Extending Cable Length
The cable of a Built-in Amplifier Sensor can be extended to a
maximum length of 200 m with each of the standard cables
(excluding some models).
For Separate Amplifier Sensors (E2C-EDA, E2C, E2J, E2CY), refer
to the specific precautions for individual products.
Example of Connection with S3D2 Sensor Controller
DC 2-Wire Sensors
Using the S3D2 Sensor Controller
Operation can be reversed with the signal input
switch on the S3D2.
Bending the Cable
Blue 0 V
If you need to bend the cable, we recommend a bend radius that is at
least 3 times the outer diameter of the cable (with the exception of
coaxial and shielded cables).
7
8
9
10 11 12
Brown OUT
Cable Tensile Strength
In general, do not subject the cable to a tension greater than that
indicated in the following table.
Cable diameter
Tensile strength
Less than 4 mm
30 N max.
4 mm min.
50 N max.
Note: Do not subject a shielded cable or coaxial cable to tension.
S3D2
4
5
6
1
2
3
Connecting to a Relay Load
Brown
X
24 VDC
Blue
Separating High-voltage Lines
Using Metal Conduits
If a power line is to be located near the Proximity Sensor cable, use a
separate metal conduit to prevent malfunction or damage. (Same for
DC models.)
Note: DC 2-Wire Sensors have a residual voltage of 3 V. Check the operating
voltage of the relay before use.
The residual voltage of the E2E-XD-M1J-T is 5 V.
DC 3-Wire Sensors
Operation can be reversed with the signal input
switch on the S3D2.
Blue 0 V
Black OUT
Brown +12 V
S3D2
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7
8
9
10 11 12
4
5
6
1
2
3
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
C-7
Proximity Sensors Technical Guide
●Operating Environment
Water Resistance
Do not use the Sensor in water, rain, or outdoors.
Ambient Conditions
Do not use the Sensor in the following environments.
Doing so may cause malfunction or failure of the Sensor.
1. To maintain operational reliability and service life, use the Sensor
only within the specified temperature range and do not use it
outdoors.
2. The Sensor has a water resistant structure, however, attaching a
cover to prevent direct contact with water will help improve
reliability and prolong product life.
3. Avoid using the Sensor where there are chemical vapors,
especially strong alkalis or acids (nitric acid, chromic acid, or hot
concentrated sulfuric acid).
●Maintenance and inspection
Periodic Inspection
To ensure long-term stable operation of the Proximity Sensor, inspect
for the following on a regular basis. Conduct these inspections also
for control devices.
1. Shifting, loosening, or deformation of the sensing object and
Proximity Sensor mounting
2. Loosening, bad contact, or wire breakage in the wiring and
connections
3. Adherence or accumulation of metal powder
4. Abnormal operating temperature or ambient conditions
5. Abnormal indicator flashing (on setting indicator types)
Disassembly and Repair
Do not under any circumstances attempt to disassemble or repair the
product.
Quick Failure Check
You can conveniently check for failures by connecting the E39-VA
Handy Checker to check the operation of the Sensor.
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(c)Copyright OMRON Corporation 2007 All Rights Reserved.
C-8
Read and Understand This Catalog
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or
comments.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if
specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR
FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE
HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR COMMERCIAL
LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR
STRICT LIABILITY.
In no event shall responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS
OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT
SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's
application or use of the product.
At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the
products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product,
machine, system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible
uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:
• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog.
• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety
equipment, and installations subject to separate industry or government regulations.
• Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE
SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT IS PROPERLY RATED AND
INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons.
It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the product may be changed without any notice. When in doubt, special model numbers may be assigned to fix
or establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual
specifications of purchased product.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
ERRORS AND OMISSIONS
The information in this catalog has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical,
typographical, or proofreading errors, or omissions.
PERFORMANCE DATA
Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent
the result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON
Warranty and Limitations of Liability.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.
COPYRIGHT AND COPY PERMISSION
This catalog shall not be copied for sales or promotions without permission.
This catalog is protected by copyright and is intended solely for use in conjunction with the product. Please notify us before copying or reproducing this
catalog in any manner, for any other purpose. If copying or transmitting this catalog to another, please copy or transmit it in its entirety.
2007. 12
OMRON Corporation
In the interest of product improvement, specifications are subject to change without notice.
Industrial Automation Company
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