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Measuring principle: Ultrasonic amplitute evaluation

If the transmitter and receiver are arranged opposite each other as an ultrasonic barrier, thin material such as papers, foils, metal sheets can be "sounded through". It is possible with these dual-head sensors to detect double layers of material very easily and reliably.

The functional principle:

The transmitter sends a high-frequency sound pulse. This propagates through the air at the speed of sound.

If the sound pulse hits a material, it is set into vibration and "sounded through". The receiver receives the signal. From the strength of the incoming signal, the ultrasonic sensor detects an additional layer of material.

Measuring principle: ultrasonic amplitute evaluation

Almost all materials that allow sound to pass through are detected - regardless of their colour. Ultrasonic dual-head sensors can even deal with high-transparent materials or thin foils.

microsonic ultrasonic sensors measure both in dusty air and through paint mist. Even thin deposits on the sensor membrane have no negative effects on sensor function. Sensors with a blind zone of only 20 mm and with an extremely slim sound beam open up completely new applications: Detection of weld seams or use in lithium-ion battery production.

Double-sheet control with dbk+4

The double-sheet sensor detects reliable if there are one or two sheets, cardboards, metal plates, or films lying on top of each other. Learn more in our online training session.


Splice detection with esp-4

Web materials are spliced or overlapped with an adhesive strip. The task of a splice sensor is to reliabe detect these splices in a web material that is usually unwound from a coil. Learn more in our online training session.



Label positioning with esf-1

The ultrasonic label sensor reliable detects the label - regardless of the label and carrier material. A labeller sticks these to products at high speed. Learn more in our online training session.


Application for ultrasonic sensors

Double-sheet control

identifies two or more sheets of material on top of each other. The dbk+4 product family is particularly suitable for use on paper-processing machines such as sheet-fed printing presses, printers, copiers or collating machines, but also in battery cell production. For thicker materials, plastic sheets and coarse corrugated cardboard, the dbk+5 ultrasonic double-sheet detection is used.

Label detection

The esf-1 label sensor reliably detects high-transparency, reflective materials as well as metallised labels and labels of any colour. The measurement cycle time automatically self-adjusts to the sound power required. If you are looking for a label sensor with separated housings you can choose the esp label sensor .

Splice detection

The esp-4 splice sensor reliably detects splices and also labels. It is available both in M18 housings, as well as in M12 with external receiving transducer.

Through-beam barrier

Ultrasonic through-beam barriers are highly suited for reliable presence control and counting of objects at high speed. The through-beam barrier consist of a transmitter and a receiver. The transmitter emits acoustic pulses on a cyclical basis which are captured by the receiver. If an object interrupts the pulses between the transmitter and the receiver, the switching output of the receiver is set.

Web edge control

The ultrasonic web edge sensors bks and edge sensor bks+ sense the edge of web-form materials which are decoiled from a spool and guided through a processing machine. The position of the edge is required in order to readjust the web run in such a fashion that the material run always remains “on track”. 

The ultrasonic web edge sensors are structured as a fork sensor and work as a through-beam barrier. A transmitter is located in the lower prong of the fork, which emits continuous ultrasound. A receiver transducer in the upper prong receives the emitted ultrasonic signal and evaluates its intensity. A web material inserted in the fork of the web edge sensor more or less covers the sound path between the transmitter and the receiver. The intensity of the receiver signal varies depending on the degree of coverage. This change is issued as an analogue signal 4-20 mA or 4–20 mA for the purpose of controlling the web run.

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    Technical Support Team