E4A-3K-DC12/24 - Omron - Product.Network

E4A-3K Ultrasonic Reflective Sensor

Sensor with an Adjustable Sensing

Distance of 0.3 to 3 m Under Stable

Operation without Background

Interference

■Ensures a stable operating range with minimal

side-lobe areas.

■Built-in unstable operation check function allows

easy adjustment to a proper mounting direction.

■Mono-block construction with a sensor, power

supply, and terminals ensures easy wiring.

■Incorporates synchronous selector and reference

pulse I/O terminals ideal for parallel-operation use

without mutual interference.

Ordering Information

Application Examples

Detection of cellophane, glass, and

photosensitive paper

Detection of objects on conveyors or

discrimination of object heights

Sensing method Reflective

Model E4A-3K

E4A-3KE4A-3K

Specifications

■Ratings/Characteristics

Note: Models operating at 12 to 24 VDC are available. Specify the supply voltage when ordering.

■Operating and Dead Ranges

An object may be detected due to multiple reflection if the object is in the dead range, in which case however, 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.

Supply voltage 100, 110, 200, and 220 VAC ± 10% at 50/60 Hz (see note)

Power consumption Approx. 2.5 VA

Sensing distance Adjustable between 0.3 and 3 m (selectable ranges of 0.3 and 2 m or 1.3 and 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

Ultrasonic oscillation frequency Approx. 40 kHz

Directional angle Half-value angle: 25°

Response time Operate time: 0.25 s; release time: 0.5 s

Control output Contact output: SPDT

3 A at 220 VAC, cos dia.=1 or 3 A at 24 VDC, cos dia.=1

Ambient temperature Operating: –20°C to 55°C (with no icing)

Ambient humidity Operating: 45% to 85%

Insulation resistance 20 MΩ min. (at 500 VDC)

Dielectric strength 1,500 VAC, 50/60 Hz for 1 min

Vibration resistance Destruction: 10 to 25 Hz, 1.5-mm double amplitude for 2 hrs each in X, Y, and Z directions

Shock resistance Destruction: 500 m/s2 (approx. 50G) 3 times each in ±X, ±Y, and ±Z directions

Life expectancy

(output relay)

Mechanical 20,000,000 operations min.

Electrical 100,000 operations min.

Enclosure rating IEC IP60

Weight Approx. 500 g without Mounting Bracket

Approx. 600 g with Mounting Bracket

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

B: Sensing zone

Dead range

Operating range: 0.5 m

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

Sensor

Reference level

A: Sensing distance Dead range

Operating range: 1.5 m

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

B: Sensing zone

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 sensing distance (A) is adjusta-

ble with the distance selector to a

range between 1.3 and 3 m.

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.

E4A-3KE4A-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.

Reference

• Each of the following illustrations indicates the operating zone

with the E4A-3K mounted to the ceiling for the purpose of detect-

ing the human body. In either case, make sure that the lower limit

of the sensing range is approximately 0.5 m above the floor so

that the floor will not be detected.

Typical Example

• If more than one Unit is used within a maximum distance of 8 m,

be sure to wire the Units so that the Units will be in synchronous

operation. Refer to External Connections for details.

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

ing zones as shown in the following illustration, be sure to wire

the Units so that the Units will be in synchronous operation.

Distance (cm) Distance (cm)

Distance (cm)

Sensing object :

100 dia. x 1,000 (mm)

Sensing object:

200 x 200 (mm)

flat plate

Sensing object :

25 dia. x 100 (mm)

Operating

zone

(

)

Ultrasonic

Sensor

Operating

zone

(

)

Operating

zone

(

)

Ultrasonic

Sensor

Operating

zone

(

)

Operating

zone

(

)

Ultrasonic

Sensor

Operating

zone

(

)

Sensing distance

2 m

450 mm

550 mm

600 mm

750 mm

3 m

Approx. 0.5 m

Distance selector set to a range

between 1.3 and 3 m.

Sensing distance

(operating zone)

= Approx. 1.5 m

Sensing distance

(operating zone)

= Approx. 1.5 m

8 m max.

Sensor

Door

E4A-3KE4A-3K

Dimensions

Note: All units are in millimeters unless otherwise indicated.

Installation

■External Connections

E4A-3K

Rubber cap

Indicator

Mounting Dimensions

Two, 6.5 dia.

6.6 dia.

24 dia.

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

Contact output

100/110 VAC

200/220 VAC

Contact output

100/110 VAC

200/220 VAC

Contact output

100/110 VAC

200/220 VAC

Example of Connections of the E4A-3K

in Asynchronous Operation

Note: 1. If the synchronous operation of the

E4A-3K is not required, set the

reference pulse selector to ON.

Keep terminals 7 and 8 open.

2. Use a cable with an external

diameter 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 Units can be connected in synchronous operation.

3. Do not wire the lines for synchronous operation use (i.e., wires connecting 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.

E4A-3KE4A-3K

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.

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

between 0.3 and 2 m or a range between 1.3 and 3 m

according to the desired sensing distance and operating

range.

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

sensing 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 sensing distance) until the relay operates. The opera-

tion indicator will be lit when the relay operates.

Standard Sensing Distance Settings

• If the sensing object is moving vertically towards 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 follow-

ing illustration.

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. Furthermore, 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.

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 discrimina-

tion 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 dis-

tance required for the sensing object to move.

Operation Check

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

ates properly by locating the sensing object within the operating

range. Then remove the sensing object and check that the opera-

tion indicator is not lit. The operating 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

Sensing distance adjuster

Distance selector

Reference pulse selector

Sensing distance

Operating range

Sensing side

Sensing distance

Operating

range

Sensing side

0.1 d min.

Sensing distance

Operating range

Operation indicator flashing Operation indicator not li

E4A-3KE4A-3K

Precautions

■Correct Use

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 side

lobe 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 Dimen-

sions for details.

Do not strike the Sensor with any hammer or other object, other-

wise the E4A-3K will no longer be water-resistant.

If the E4A-3K is not mounted securely, the E4A-3K may be dam-

aged 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 Reflective Sensor utilizes the air as a beam trans-

mission media. Do not use the E4A-3K in places with radical con-

vection or extreme local temperature changes. For example, if

there is a hot air curtain that causes turbulence within the sensing

area, the E4A-3K may malfunction.

The jetting sound of air nozzles includes noise of a wide fre-

quency 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 sur-

face of the emitter or receiver.

Turbulence Air curtain

E4A-3K

E4A-3KE4A-3K

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

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

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

OMRON Corporation

Industrial Automation Company

Sensing Devices Division H.Q.

Application Sensors Division

Shiokoji Horikawa, Shimogyo-ku,

Kyoto, 600-8530 Japan

Tel: (81)75-344-7068/Fax: (81)75-344-7107

2008.4

OMRON Corporation

Industrial Automation Company

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

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It is our practice to change model numbers when published ratings or features are changed, or when signiﬁ cant construction changes are made.

However, some speciﬁ cations of the product may be changed without any notice. When in doubt, special model numbers may be assigned to ﬁ x

or establish key speciﬁ cations for your application on your request. Please consult with your OMRON representative at any time to conﬁ rm actu a l

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Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.

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