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Product description

The microsonic bks+6/FIU is an ultrasonic sensor for web edge guiding with 40 mm range. Ideal for controlling the web edge of transparent materials such as thin films. Equipped with 4-20 mA and 0-10 Vdc output, digital output for breakage detection and IO-Link V1.1 interface.

The bks+6/FIU ultrasonic web edge sensor from microsonic is a fork sensor that detects the edge of sound-absorbing materials such as foils or paper. This makes the bks+ sensors ideal for the web guiding of very transparent foils, light-sensitive materials and materials with fluctuating transparency and paper with a lot of paper dust formation.

The working principle

The sensor contains an ultrasonic transmitter that sends out short cyclic sound pulses. These pulses are detected by the ultrasonic receiver located in the same fork housing, facing the transmitter. A material located between the transmitter and receiver in the fork opening of the sensor ensures that part or all of the sound pulse is attenuated. This attenuation is processed in the sensor. Depending on which part of the sound pulse is attenuated by the material, an analog signal (0-10 Vdc or 4-20 mA), data packet via IO-Link or a PNP or NPN switching output. The operating range for the bks+3/FIU is 12 mm, for the bks+6/FIU it is 40 mm.

Switching between a voltage- or current-based analog output is possible with a button or through LinkControlThe bks+ is pre-configured and ready to use. Optionally, it can also be configured extensively with the LinkControl LCA-2 adapter. As a standard, version 1.1 of the IO-Link is installed.

Product specifications

Additional information


5-pin M12 connector



Sealing class


IO link version 1.1



Measuring range

40 mm

Response time

6 ms




Ultrasonic sensor


0 - 10 V, 4 - 20 mA, PushPull


Edge guiding sensors

Power supply

20 - 30 Vdc

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