Ultrasonic Long Range

E4A-3K

Long Sensing Distance of 0.3 to 3 m

Background suppression for accurate
sensing

Fast alignment troubleshooting with
stable operation check function

Mutual interference protection built in

Self-contained, no external power
supply required

Ordering Information

Supply voltage

Sensing type

Sensing distance

Part number

12 to 24 VDC

Reflective

0.3 to 3 m

E4A-3K DC12/24

120/240 VAC

Reflective

0.3 to 3 m

E4A-3K AC120/240

Specifications

RATINGS/CHARACTERISTICS

Part number

E4A-3K DC12/24

E4A-3K AC120/240

Sensing method

Reflective

Supply voltage

12-24 VDC, ¦10% ripple (p-p)
¦

10%

120/240 VAC, 50/60 Hz, ¦10%

Power consumption

150 mA max.

Approx. 2.5 VA

Sensing distance

Adjustable between 0.3 and 3 m (selectable ranges of 0.3 to 2 m and 1.3 to 3 m)

Standard sensing object

100 mm dia., 1.5 m long metal or plastic round pipe

Minimum sensing object

50 x 50 mm flat plate

Directional angle

25°

Ultrasonic oscillation frequency

Approx. 40 kHz

Response time

Operate

0.25 s

Response time

Release

0.5 s

Control output

Contact output : SPDT 3 A at 220 VAC/24 VDC (resistive load)

Indicators

Operation, red LED

Ambient operating temperature

--20°C to 55°C (--4°F to 131°F) with no icing

Relative humidity

45% to 85%

(This table continues on the next page.)

E4A-3K

Specifications Table

-- continued from previous page

Part number

E4A-3K DC12/24

E4A-3K AC120/240

Insulation resistance

20 M minimum at 500 VDC

Dielectric strength

1500 VAC, 50/60 Hz for 1 minute

Vibration resistance

10 to 25 Hz, 1.5-mm double amplitude for 2 hours each in X, Y and Z axes

Shock resistance

500 m/s

(approx. 50 g) 6 times each in X, Y and Z axes

Life expectance (output relay)

Mechanical 20,000,000 operations minimum

Life expectance (output relay)

Electrical

100,000 operations minimum

Enclosure rating

IP60

Approvals

UL, cUL

Recognized, File No. E41515

Weight

Approx. 600 g with mounting bracket

Approx. 500 g without mounting bracket

OPERATING RANGE AND SENSING ZONE

1. Distance Selector Set to a Range Between

0.3 and 2 m

2. Distance Selector Set to a Range Between

1.3 and 3 m

Sensor

Reference level

A: Sensing distance

The sensing distance (A) is adjust-

able with the distance selector to a

range between 0.3 and 2 m.

If the sensing distance (A) is set to 2 m,

the sensing zone (B) is 1.5 to 2 m.
If the sensing distance (A) is set to 0.3 m,

the sensing zone (B) is 0 to 0.3 m.

The distance from the reference level to the operating range (sensing zone).

Sensor

Reference level

A: Sensing distance

The sensing distance (A) is adjust-

able with the distance selector to a

range between 1.3 and 3 m.

Blind zone

If the sensing distance (A) is set to 3 m,

the sensing zone (B) is 1.5 to 3 m.

If the sensing distance (A) is set to 1.3 m,

the sensing zone (B) is 0 to 1.3 m.

Sensing zone (B) 1.5 m

The distance from the reference level to the operating range (sensing zone).

B: Sensing zone

Sensing zone (B) 0.5m

An object may be detected due to multiple reflection if the object is in the blind zone, in which case the detection of the object will not be

stable. Therefore, do not attempt to use the E4A-3K to detect an object in the dead range by making use of multiple reflection.

Note: Multiple reflection is a phenomenon caused by an ultrasonic beam reflected several times repeatedly between the sensing object

and the Sensor or nearby objects such as the ceiling.

E4A-3K

Engineering Data

OPERATING ZONE (TYPICAL EXAMPLES)

The operating zone is the sensing range of the E4A-3K at the sensing distance with the sensing object moved vertically towards the ultra-

sonic beam. The operating zone varies with the sensing distance and sensing object.

Distance (cm)

Operating

zone (cm)

Ultrasonic

sensor

Operating

zone (cm)

Operating

zone (cm)

Ultrasonic

sensor

Operating

zone (cm)

Distance (cm)

Sensing object :

25 dia. x 100 (mm)

Operating

zone (cm)

Ultrasonic

sensor

Operating

zone (cm)

Sensing object:

200 x 200 (mm)

flat plate

Sensing object :

100 dia. x 1,000 (mm)

If more than one Unit is used within a maximum distance of

8m, be sure to wire the sensor for synchronous operation.
Refer to External Connections for details.

8 m max.

If there is a door between two Units located for different oper-

ating zones as shown in the following illustration, be sure to
wire the Units for synchronous operation, or interference may

occur when the door opens.

Sensor

Door

E4A-3K

Installation

EXTERNAL CONNECTIONS

Example of Connections of the

E4A-3K in Asynchronous Operation

Example of Connections of the E4A-3K in Synchronous Operation

Note: 1. If the synchronous operation of the

E4A-3K is not required, set the ref-
erence pulse selector to ON. Keep

terminals 7 and 8 open.

2. Use a cable with an external diam-

eter of 10 mm max. for wiring.

Note: 1. If the synchronous operation of the E4A-3K is required, set the reference

pulse selector of only one Unit to ON. Then connect terminal 7 of all the
Units together and do the same for terminal 8.

2. A maximum of 50 sensors can be connected in synchronous operation.
3. Do not wire the lines for synchronous operation use (i.e., wires connect-

ing to terminals 7 and 8) alongside power lines in the same conduit.

4. Use a shielded cable with an external diameter of 10 mm max. for wiring.
5. Make sure that all the Units in synchronous operation are turned on,

otherwise none of the Units will operate.

Contact output

100/120 VAC
200/240 VAC

Contact output

Tc Ta Tb

12~24 VDC

OFF

12~24 VDC

100/120 VAC
200/240 VAC

OFF

Adjustments

REFERENCE PULSE SELECTOR

POSITION

If more than one Unit is used at one location, the Units will need
to be in synchronous operation to prevent mutual interference. In

that case, set the reference pulse selector of only one Unit to ON.

Set the reference pulse selector of each Unit to ON if the Units

are in asynchronous operation. Refer to External Connections for

details.

Operation indicator

Sensing distance adjuster

Distance selector

Reference pulse selector

SENSING DISTANCE ADJUSTMENTS

Before adjusting the sensing distance, remove the rubber cap
from the top of the E4A-3K. Be sure to put on the rubber cap

after the sensing distance is adjusted.
1. Apply a flat-blade screwdriver to the groove of the distance

selector to set the distance selector to either a range be-

tween 0.3 and 2 m or a range between 1.3 and 3 m accord-

ing to the desired sensing distance and operating range.

2. To set the sensing distance, first locate a flat plate as a sens-

ing object that is approximately 20-by-20 cm at the desired

sensing distance. Then gradually turn the sensing distance

adjuster clockwise (i.e., in the direction increasing the sens-

ing distance) until the relay operates. The operation indicator

will be lit when the relay operates.

E4A-3K

STANDARD SENSING DISTANCE

SETTINGS

If the sensing object is moving across the ultrasonic beam
(i.e., the E4A-3K is in normal sensing operation), set the

sensing distance so that the sensing side of the object
passes through the center of the operating range as shown in

the following illustration.

Sensing distance

Operating range

Sensing side

If there is an object, such as a floor, wall, or conveyor, located
behind the sensing object, make sure that the distance between

the set sensing distance (d) and the background object is 0.1d

min. Also, make sure that the set sensing distance (d) is at least

0.1d closer to the Sensor from the maximum limit of the operating

range as shown in the following illustration.

Operating range

Sensing side

0.1 d min.

Sensing distance

From the above, the minimum height (h) of the sensing object is

expressed by 0.2d. If the sensing object is comparatively low in

height or if the E4A-3K is used for the delicate height

discrimination of objects, it will be necessary to set the sensing
distance to a small value.

If the sensing object is moving parallel to the ultrasonic beam

for level or height detection, the sensing distance will be the
distance required for the sensing object to move.

Sensing distance

Operating range

OPERATION CHECK

After adjusting the sensing distance, check that the E4A-3K

operates properly by locating the sensing object within the

operating range. Then remove the sensing object and check that

the operation indicator is not lit. The operation indicator may be
still be lit or flashing after the sensing object is removed. In that

case, the E4A-3K may be malfunctioning due to beam reflection

from objects outside the operating range or affected by ambient

wind or temperature, in which case, eliminate the cause or

change the mounting position or direction of the Sensor.

If the mounting position or direction of the Sensor is changed, be

sure to check the sensing distance and the operation of the

E4A-3K.

Operation indicator flashing

Operation indicator not lit

E4A-3K

Precautions

SENSOR MOUNTING ANGLE

If the E4A-3K is in level control or distance control of sensing
objects, the stability of signal detection will depend on the

sensing surface condition of the objects. Considering the repose

angle of the objects, mount the E4A-3K so that the ultrasonic

beam and the sensing surface of each object meet at right angles

to each other.

SURROUNDING OBJECTS

Make sure that the Sensor is free from surrounding objects that
reflect the ultrasonic beam diffusion, otherwise the Sensor may

malfunction. In particular, pay the utmost attention so that no

peripheral area of the ultrasonic beam will be reflected by such

objects.

MOUNTING

Securely mount the E4A-3K by using the nuts provided with the

E4A-3K or the mounting holes of the E4A-3K. Refer to
Dimensions for details.

Do not subject the Sensor to heavy impact, shock, or vibration

(see Specifications) or the E4A-3K will no longer be
water-resistant.

If the E4A-3K is not mounted securely, it may be damaged by

vibration or may not detect sensing objects accurately due to a

possible change in the mounting position.

ENVIRONMENTAL CONDITIONS

Do not use the E4A-3K at a temperature exceeding the rated
range or outdoors, otherwise the reliability and life of the E4A-3K

will decrease.

The Ultrasonic Sensor utilizes the air as a beam transmission

media. Do not use the E4A-3K in places with strong air currents
or extreme temperature changes. For example, if there is an air

curtain that causes turbulence within the sensing area, the

E4A-3K may malfunction.

Turbulence

Air curtain

E4A-3K

The jetting sound of air nozzles includes noise of a wide

frequency range, which will affect the operation of the E4A-3K.

Do not use an air nozzle near the E4A-3K.

The sensing distance of the E4A-3K will decrease if there is any

water drops on the surface of the emitter or receiver.

The reflective model may not detect any objects if there is any
object absorbing sound, such as powder and cotton, on the

surface of the emitter or receiver.

Cat. No.

CEDSAX4

11/01

Specifications subject to change without notice. Printed in U.S.A.

OMRON ELECTRONICS LLC

One East Commerce Drive

Schaumburg, IL 60173

NOTE: DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters to inches divide by 25.4.

1-800-55-OMRON

OMRON CANADA, INC.

885 Milner Avenue

Scarborough, Ontario M1B 5V8

416-286-6465

OMRON ON--LINE

Global -- http://www.omron.com
USA -- http://www.omron.com/oei
Canada -- http://www.omron.com/oci

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