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EGE ARK Ultrasonic Distances Sensor

EGE ultrasonic sensors for contactless measuring of distances are robust in design and waterproof (IP 67.) They are available for switching points from 10 to 3500 mm and are programmable as well.

EGE ultrasonic sensors for contactless measuring of distances are robust in design and waterproof (IP 67.) They are available for switching points from 10 to 3500 mm and are programmable as well.

Ultrasonic sensors are transmitting and receiving ultrasonic signals. These signals have a frequency range from 65 kHz up to 300 kHz. Ultrasonic sensors can be used for several different applications, for example:
diameter detection

  • loop tension
  • height detection
  • level measuring
  • counting

Cycle period

A short ultrasonic pulse is transmitted at the time 0, reflected by an object. The sensor receives this signal and converts it to an electric signal. The next pulse can be transmitted when the echo is faded away. This time period is called the cycle period. (Fig. 1)

Sensors with

  • long sensing ranges have long cycle periods and slow reaction time.
  • short sensing ranges have short cycle periods and fast reaction times.
EGE Ultrasonic Sensor Fig.1
EGE Ultrasonic Sensor Fig.1

Angle of beam
The energy of the ultrasonic pulse is transmitted in form of a cone along the transducer axis. The highest intensity is on the axis and decreases with rising angles. The angle of beam is defined by the angle through which the energy of the ultrasonic pulse is reduced of 33% of its maximum value.

The best detection is given by an object that stands vertically to the transducer axis. To give a save detection, the object should not have a greater angle than half of the angle of the beam (α/2). (Fig. 2) If the object is canted at a greater angle, there is no reflection of the ultrasonic pulses. An object with a flat surface and canted at an angle of 45° to the transducer axis refracts the ultrasonic pulse at an angle of 90°. An ultrasonic pulse can be compared to a light beam.

EGE Ultrasonic Sensor Fig.2
EGE Ultrasonic Sensor Fig.2

Voltage amplitude
During the transmission, the voltage amplitude of the ultrasonic pulse is approximate 80 V PP. The pulse period of the ultrasonic pulse depends on the duration of the transmission pulse and on the ringing time of the transducer. The voltage amplitude of the received echo is in the range of μV. (Fig. 3)

EGE Ultrasonic Sensor Fig.3
EGE Ultrasonic Sensor Fig.3

Blind zone
It is not possible to receive an echo during the transmission of the ultrasonic pulse. This time period defines the range of the blind zone. In this blind zone, it is not possible to measure a distance. (Fig. 4)

EGE Ultrasonic Sensor Fig.4
EGE Ultrasonic Sensor Fig.4

Features

The Feature of the ARK Ultrasonic Sensor:

  • With switching point
  • Plastic miniature housing
  • DC 18…30 V
  • PNP output
    Teach-in programming

Applications

Non-contact detection of:

  • distances
  • presence
  • level
  • diameter
  • position

Independent of:

  • material
  • color
  • light
  • smoke
  • dust

Specifications

Design DC PNP   • rectangular housing 26x40x12
Sensing range 25…250 mm
Output EGE Output 1
ID-No. P72026
Type ARKS 250 GPP
Supply voltage 18…30 VDC
Current consumption 35 mA
Switching current 100 mA
Switching frequency 50 Hz
Ambient temperature -20…+70 °C
Protection [EN 60529] IP 67
Housing material PBTP
Connection M8 connector
Accessories M8 plug type connection, 2 m PVC-cable is part of delivery

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EGE ARK Ultrasonic Distances Sensor

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