Omron E2A3 DATASHEET

Long Distance Cylindrical Proximity Sensor

E2A3

Extra long distance for
increased protection and
sensing performance

• triple distance proximity sensors for flush mounting re­quirements.

• designed and tested for extra long life.

Ordering Information

DC 3-wire Models

Size Typ e

M8 Shielded 3.0mm

M12 Shielded 6.0mm

M18 Shielded 11.0mm

M30 Shielded 20.0mm

Note:Material specifications for stainless steel housing case: 1.4305 (W.-No.), SUS303 (AISI), 2346 (SS).

Sensing
distance

Connection

Pre-wired

M12
connector

M8
connector
(3-pin)

Pre-wired

M12
connector

Pre-wired

M12
connector

Pre-wired

M12
connector

Body

material

Stainless steel
(See note.)

Brass

Brass

Brass

Thread

length

27 (40) mm

27 (44) mm

27 (40) mm

34 (50) mm

34 (49) mm

39 (60) mm

39 (54) mm

44 (65) mm

44 (59) mm

Output Operation mode: NO Operation mode: NC

PNP E2A3-S08KS03-WP-B1 2M E2A3-S08KS03-WP-B2 2M
NPN E2A3-S08KS03-WP-C1 2M E2A3-S08KS03-WP-C2 2M
PNP E2A3-S08KS03-M1-B1 E2A3-S08KS03-M1-B2
NPN E2A3-S08KS03-M1-C1 E2A3-S08KS03-M1-C2
PNP E2A3-S08KS03-M5-B1 E2A3-S08KS03-M5-B2

NPN E2A3-S08KS03-M5-C1 E2A3-S08KS03-M5-C2

PNP E2A3-M12KS06-WP-B1 2M E2A3-M12KS06-WP-B2 2M
NPN E2A3-M12KS06-WP-C1 2M E2A3-M12KS06-WP-C2 2M
PNP E2A3-M12KS06-M1-B1 E2A3-M12KS06-M1-B2
NPN E2A3-M12KS06-M1-C1 E2A3-M12KS06-M1-C2
PNP E2A3-M18KS11-WP-B1 2M E2A3-M18KS11-WP-B2 2M
NPN E2A3-M18KS11-WP-C1 2M E2A3-M18KS11-WP-C2 2M
PNP E2A3-M18KS11-M1-B1 E2A3-M18KS11-M1-B2
NPN E2A3-M18KS11-M1-C1 E2A3-M18KS11-M1-C2
PNP E2A3-M30KS20-WP-B1 2M E2A3-M30KS20-WP-B2 2M
NPN E2A3-M30KS20-WP-C1 2M E2A3-M30KS20-WP-C2 2M
PNP E2A3-M30KS20-M1-B1 E2A3-M30KS20-M1-B2
NPN E2A3-M30KS20-M1-C1 E2A3-M30KS20-M1-C2

.

E2A3

D-35E2A3

Connectivity

E2A3 Sensors are available with the following connectors and cable materials:

Pre-wired Models

Connector Models

Standard cable lengths are 2 m and 5 m.

Standard connectors: M12, M8 (3-pin) -M1, -M5

For other cable lengths, please contact your OMRON
representative.

Standard cable material: PVC (4-mm dia.) -WP

Model Number Legend

E2A@-@@@@@-@-@@-@@

2 3 4 5 6 7 8 9 10 111 12

Example: E2A3-M12KS06-M1-B1 Triple distance, M12, standard barrel, shielded, Sn = 6 mm, M12 connector, PNP-NO

1. Basic name

2. Sensing technology

3. Housing shape and material

4. Housing size

5. Barrel length

6. Shield

7. Sensing distance

E2A3-S08KS03-WP-B1 2M Triple distance, M8 stainless steel, standard barrel, shielded, Sn = 3 mm, pre-wired PVC cable,

E2A

Blank: Standard double distance

3: Triple distance

M: Cylindrical, metric threaded, brass

S: Cylindrical, metric threaded, stainless steel

08: 8 mm

12: 12 mm

18: 18 mm

30: 30 mm

K: Standard length

L: Long body

S: Shielded

N: Non-shielded

Numeral: Sensing distance: e.g., 03 = 3 mm, 11 = 11 mm

PNP-NO, cable length = 2 m

8. Kind of connection

WP: Pre-wired, PVC, 4-mm dia.

M1: M12 connector (4-pin) *

M5: M8 connector (3-pin)

9. Power source and output

B: DC, 3-wire, PNP open collector

C: DC, 3-wire, NPN open collector

10.Operation mode

1: Normally open (NO)

2: Normally closed (NC)

11.Specials (e.g., cable material, oscillating frequency)

12.Cable length

Blank: Connector Model

Numeral: Cable length

D-36 Inductive Sensors

Specifications

DC 3-wire Models

Size M8 M12 M18 M30

Typ e Shielded Shielded Shielded Shielded

E2A3-S08KS03-@@-B@

Item

Sensing distance 3 mm ± 10% 6 mm ± 10% 11 mm ± 10% 20 mm ± 10%

Ambient temp. of

Setting
distance

Differential travel 20% max. of sensing distance
Target Ferrous metal (The sensing distance decreases with non-ferrous metal.)
Standard sensing object 9 × 9 × 1 mm 18 × 18 × 1 mm 33 × 33 × 1 mm 60 × 60 × 1 mm
Response frequency (See note 1.) 700 Hz 350 Hz 250 Hz 80 Hz
Power supply voltage

(operating voltage range)
Current consumption 10 mA max.

Output type

Control output

Indicator Operation indicator (Yellow LED)

Operation mode

Protection circuits

Ambient air temperature Operating: −25°C to 70°C, Storage: −25°C to 70°C

Temperature influence

Ambient humidity Operating: 35% to 95%, Storage: 35% to 95%
Voltage influence ±1% max. of sensing distance in rated voltage range ±15%
Insulation resistance 50 MΩ min. (at 500 VDC) between current-carrying parts and case
Dielectric strength 1,000 VAC at 50/60 Hz for 1 min between current-carrying parts and case
Vibration resistance 10 to 55 Hz, 1.5-mm double amplitude for 2 hours each in X, Y, and Z directions

Shock resistance

Standards and listings
(See note 2.)

Connection method

Weight
(packed state)

Material

Note 1. The response frequency is an average value. Measurement conditions are as follows: standard sensing object, a distance of twice the

standard sensing object length between sensing objects, and a set distance of half the sensing distance.

2. For USA and Canada: use class 2 circuit only.

−25 to 70°C
Ambient temp. of

−10 to 60°C

Load current 200 mA max. (32 VDC max.)
Residual voltage 2 V max. (under load current of 200 mA with cable length of 2 m)

Pre-wired Models Approx. 65 g Approx. 85 g Approx. 160 g Approx. 280 g

Connector Models

Case Stainless steel Brass-nickel plated
Sensing surface PBT
Cable PVC
Clamping nut Stainless steel Brass-nickel plated

E2A3-S08KS03-@@-C@

0 to 2.1 mm 0 to 4.2 mm 0 to 7.7 mm 0 to 14 mm

0 to 2.4 mm 0 to 4.8 mm 0 to 8.8 mm 0 to 16 mm

12 to 24 VDC. Ripple (p-p): 10% max.
(10 to 32 VDC)

-B models: PNP open collector

-C models: NPN open collector

-B1/-C1 models: NO

-B2/-C2 models: NC
For details, refer to the timing charts.

Power source circuit re­verse polarity protection,
Surge suppressor, Short­circuit protection

±20% max. of sensing distance at 23°C within temperature range of −25°C to 70°C

−10% to +20% of sensing distance at 23°C within temperature range of −10°

2

500 m/s
in X, Y, and Z directions

IP67 after IEC 60529
IP69K after DIN 40050
EMC after EN60947-5-2

-WP models: Pre-wired Models (4-mm dia. PVC cable with length of 2 m)

-M1 models: M12 4-pin Connector Models

-M5 models: M8 3-pin Connector Models

M12 Connector Models:
Approx. 20 g

, 10 times each

E2A3-M12KS06-@@-B@
E2A3-M12KS06-@@-C@

Output reverse polarity protection, Power source circuit reverse polarity protec­tion, Surge suppressor, Short-circuit protection

1,000 m/s

Approx. 35 g Approx. 70 g Approx. 200 g

2

, 10 times each in X, Y and Z directions

E2A3-M18KS11-@@-B@
E2A3-M18KS11-@@-C@

C to 60°C

E2A3-M30KS20-@@-B@
E2A3-M30KS20-@@-C@

E2A3

D-37E2A3

Engineering Data

Operating Range (Typical)

22

20

18

16

14

12

10

8

Sensing distance X (mm)

6

4

2

0

−30 −20 −10 0 10 20 30

Influence of Sensing Object Size and Materials

Y

X

E2A3-M30KS20

E2A3-M18KS11

E2A3-M12KS06

E2A3-S08KS03

Distance Y (mm)

E2A3-S08KS03

3.5

@d

3.0

2.5

2.0

1.5

X

Sensing distance X (mm)

1.0

0.5

0.0
0 5 10 15 20 25

t = 1 mm

Iron

Stainless steel (SUS303)

Brass

Aluminum

Copper

Side length of sensing object d (mm)

E2A3-M30KS20

25

@d

t = 1 mm

X

20

15

10

Sensing distance X (mm)

5

Iron

Stainless steel (SUS303)

Brass

Aluminum

Copper

E2A3-M12KS06

7

@d

t = 1 mm

X

6

5

4

3

Sensing distance X (mm)

2

1

0

0 5 10 15 20 25 30

Iron

Stainless steel (SUS303)

Brass

Aluminum

Copper

Side length of sensing object d (mm)

E2A3-M18KS11

12

@d

t = 1 mm

10

Sensing distance X (mm)

X

8

6

4

2

0

0 10 20 30 40 50

Iron

Stainless steel (SUS303)

Brass

Aluminum
Copper

Side length of sensing object d (mm)

0

0 10 20 30 40 50 60

Side length of sensing object d (mm)

D-38 Inductive Sensors

Operation

DC 3-wire Models

PNP Output

Operation mode Model Timing chart Output circuit

NO E2A3-@-@-B1

Sensing
object

(%)

Sensing areaNon-sensing area

100 0

Rated

sensing

distance

Proximity
Sensor

ON

Yellow indicator

OFF

ON

Control output

OFF

Proximity
Sensor
main
circuits

Note 1: With M8 Size Models, there is no output reverse

polarity protection diode.

M12 Connector

Pin Arrangement

(See note 2.)

(See note 1.)

M8 Connector

Pin Arrangement

(3-pin)

Brown

Black

Blue

+V

Load

0 V

NC E2A3-@-@-B2

Sensing
object

(%)

Sensing areaNon-sensing area

100 0

Rated

sensing

distance

Proximity
Sensor

ON

Yellow indicator

OFF

ON

Control output

OFF

1

2

4

3

Note 2: Terminal 2 of the M12 connector is not used.

Proximity
Sensor
main
circuits

Note 1: With M8 Size Models, there is no output reverse

polarity protection diode.

M12 Connector

Pin Arrangement

(See note 2.)

1

2

4

3

Note 2: Terminal 4 of the M12 connector is not used.

4

3

1

Brown

Black

(M8 connector: )

(See note 1.)

Blue

M8 Connector

(3-pin)

Pin Arrangement

4

3

1

+V

Load

0 V

E2A3

D-39E2A3

DC 3-wire Models

NPN Output

Operation mode Model Timing chart Output circuit

Sensing
object

(%)

Sensing areaNon-sensing area

100 0

Rated

sensing

distance

Proximity
Sensor

Proximity
Sensor
main
circuits

(See note 1.)

Brown

Black

+V

Load

NO E2A3-@-@-C1

NC E2A3-@-@-C2

Sensing
object

(%)

Sensing areaNon-sensing area

100 0

Rated

sensing

distance

ON

Yellow indicator

OFF

ON

Control output

OFF

Proximity
Sensor

ON

Yellow indicator

OFF

ON

Control output

OFF

Blue

Note 1: With M8 Size Models, there is no output reverse

polarity protection diode.

Pin Arrangement

4

Pin Arrangement

4

M8 Connector

(3-pin)

4

3

1

(See note 1.)

M8 Connector

(3-pin)

4

3

1

Brown

Load

Black

(M8 connector: )

Blue

M12 Connector

Pin Arrangement

(See note 2.)

1

2

3

Note 2: Terminal 2 of the M12 connector is not used.

Proximity
Sensor
main
circuits

Note 1: With M8 Size Models, there is no output reverse

polarity protection diode.

M12 Connector

Pin Arrangement

(See note 2.)

1

2

3

0 V

+V

0 V

Note 2: Terminal 4 of the M12 connector is not used.

D-40 Inductive Sensors

Dimensions

ping

)

ping

ping

ping

Note:All units are in millimeters unless otherwise indicated.

Pre-wired Models

E2A3-S08KS03-WP-@@

40

26.8

M8×1

45

Two, clamping nuts

(See note 1.)

Indicator (See note 2.)

2

; Insulator diameter: 1.3 mm),

13

Note 1. 4-dia. vinyl-insulated round cable with 3 conductors (Conduc-

tor cross section: 0.3 mm
Standard length: 2 m

2. Operation indicator (yellow)

E2A3-M12KS06-WP-@@

50.4

34

5.5

17

M12×1

Note 1. 4-dia. vinyl-insulated round cable with 3 conductors (Conduc-

tor cross section: 0.3 mm

12

(See note 1.)

Indicator (See note 2.)

Two, clam

nuts

2

; Insulator diameter: 1.3 mm),

Standard length: 2 m

2. Operation indicator (yellow)

M12 Connector Models

E2A3-M18KS11-WP-@@

59.6

39

24

Note 1. 4-dia. vinyl-insulated round cable with 3 conductors (Conduc-

tor cross section: 0.3 mm

615

M18×1

(See note 1.)

Indicator (See note 2.)

Two, clamping nuts

2

; Insulator diameter: 1.3 mm),

Standard length: 2 m

2. Operation indicator (yellow)

E2A3-M30KS20-WP-@@

64.6

36

M30×1.5

Note 1. 4-dia. vinyl-insulated round cable with 3 conductors (Conduc-

tor cross section: 0.3 mm
Standard length: 2 m

2. Operation indicator (yellow)

44

715

Indicator (See note 2.

Two, clamping nuts

2

; Insulator diameter: 1.3 mm),

(See note 1.)

E2A3

E2A3-S08KS03-M1-@@

43.9

26.8

M8×1

45

Two, clam

M12×1

Indicator (See note.)

nuts

13

Note:Operation indicator (yellow LED, 4×90°)

E2A3-M12KS06-M1-@@

49.2

34

5.5

17

M12×1

Note:Operation indicator (yellow LED, 4×90°)

12

Indicator (See note.)

Two, clamping nuts

M12×1

E2A3-M18KS11-M1-@@

54.2

39

24

615

M18×1

Two, clam

M12×1

Indicator (See note.)

nuts

Note:Operation indicator (yellow LED, 4×90°)

E2A3-M30KS20-M1-@@

59.2

36

M30×1.5

Note:Operation indicator (yellow LED, 4×90°)

44

715

M12×1

Indicator (See note.)

Two, clam

nuts

D-41E2A3

M8 Connector Models

E2A3-S08KS03-M5-@@

39.8

26.8

13

45

M8×1

M8×1

Indicator (See note.)

Two, clamping nuts

Note:Operation indicator (yellow LED, 4×90°)

Mounting Hole Cutout Dimensions

External diameter

of Proximity Sensor

M8

F

M12

M18

M30

Dimension F (mm)

+0.5

8.5 dia.

0

+0.5

12.5 dia.

0

+0.5

18.5 dia.

30.5 dia.

0

+0.5

0

D-42 Inductive Sensors

Safety Precautions

3

Precautions for Safe Use

WARNING

This product is not designed or rated for ensuring safety
of persons.
Do not it for such purposes.

Power Supply

Do not impose an excessive voltage on the E2A3, otherwise it may
be damaged. Do not impose AC current (100 to 240 VAC) on any DC
Model, otherwise it may be damaged.

Load Short-circuit

Do not short-circuit the load, or the E2A3 may be damaged.

The E2A3’s short-circuit protection function will be valid if the polarity
of the supply voltage is correct and within the rated voltage range.

Precautions for Correct Use

Designing

Power Reset Time

The Proximity Sensor is ready to operate within 100 ms after power
is supplied. If separate power supplies are connected to the Proxim­ity Sensor and load, be sure to supply power to the Proximity Sensor
before supplying power to the load.

Effects of Surrounding Metal

When mounting the E2A3 within a metal panel, ensure that the
clearances given in the following tables are maintained.

l

Wiring

Be sure to wire the E2A3 and load correctly, otherwise it may be
damaged.

Connection with No Load

Be sure to insert a load when wiring. Make sure to connect a proper
load to the E2A3 during operation, otherwise it may damage internal
elements.

Do not expose the product to flammable or explo­sive gases.

Do not disassemble, repair, or modify the product.

Power OFF

The Proximity Sensor may output a pulse signal when it is turned
OFF. Therefore, it is recommended that the load be turned OFF
before turning OFF the Proximity Sensor.

Power Supply Transformer

When using a DC power supply, make sure that the DC power sup­ply has an insulated transformer. Do not use a DC power supply with
an auto-transformer.

Mutual Interference

When installing two or more Sensors face-to-face or side-by-side,
ensure that the minimum distances given in the following table are
maintained.

d dia.

D

m

n

m

l

(Unit: mm)

Dimension M8 M12

Model

E2A3
Shielded

Material of

surrounding

metal

l 0.5 (*) 2 (*) 2 (*) 1 (*)

m9 18

d24 36

D0.5221

n24 36

Ferrous

metal

Non-

ferrous

metal

Ferrous

metal

Non-

ferrous

metal

(Unit: mm)

Dimension M18 M30

Model

E2A3
Shielded

* Using the nuts provided with the E2A3 allows mounting in the way shown be-

low.

Material of

surrounding

metal

l 4 (*) 2.5 (*) 6 (*) 4 (*)

m33 60

d54 90

D42.564

n54 90

Ferrous

metal

Non-

ferrous

metal

Nut provided with E2A

Ferrous

metal

Non-

ferrous

metal

Typ e

Shielded

A

A

B

(Unit: mm)

Dimension

M8 M12 M18 M30

A 253570110
B 20254570

E2A3

l = 0 mm

D-43E2A3

Wiring

High-tension Lines

Wiring through Metal Conduit:
If there is a power or high-tension line near the cable of the Proximity
Sensor, wire the cable through an independent metal conduit to pre­vent against Proximity Sensor damage or malfunctioning.

Cable Extension

The standard cable length is less than 200 m.

The tractive force is 50 N.

Mounting

The Proximity Sensor must not be subjected to excessive shock with
a hammer when it is installed, otherwise the Proximity Sensor may
be damaged or lose its water-resistance.

Do not tighten the nut with excessive force. A washer must be used
with the nut.

Typ e Tor que

M8 Stainless Steel Model 9 N·m

Brass Model --­M12 20 N·m
M18 60 N·m
M30 150 N·m

Maintenance and Inspection

Periodically perform the following checks to ensure stable operation
of the Proximity Sensor over a long period of time.

1. Check for mounting position, dislocation, looseness, or distortion
of the Proximity Sensor and sensing objects.

2. Check for loose wiring and connections, improper contacts, and
line breakage.

3. Check for attachment or accumulation of metal powder or dust.

4. Check for abnormal temperature conditions and other environ-

mental conditions.

5. Check for proper lighting of indicators (for models with a set indi­cator).

Never attempt to disassemble or repair the Sensor.

Environment

Water Resistivity

The Proximity Sensors are tested intensively on water resistance, but
to ensure maximum performance and life expectancy, avoid immer­sion in water and provide protection from rain or snow.

Operating Environment

Store and operate the Proximity Sensor only within the given specifi­cations.

Inrush Current

A load that has a large inrush current (e.g., a lamp or motor) will
damage the Proximity Sensor. Connect the load to the Proximity
Sensor through a relay.

<SUITABILITY FOR USE>

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of the products in the
customer’s application or use of the products.

Take all necessary steps to determine the suitability of the product for the systems, machines, and equipment with which it will be used.

<CHANGE IN SPECIFICATIONS>

Product specifications and accessories may be changed at any time based on improvements and other reasons. Consult with your OMRON
representative at any time to confirm actual specifications of purchased product.

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Cat. No. D102-E2-01A-X

In the interest of product improvement, specifications are subject to change without notice.

D-44 Inductive Sensors