General Functional Description - HYDAC ELECTRONIC HLT 2500-F1 Bedienungsanleitung

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6 General functional description

The measuring method is based on a runtime measurement (in the ultrasonic range).
The ultrasound propagation runtime is proportional to the distance and is processed in
an evaluation unit. A ferro-magnetic conductor is tensioned and supplied with a current
pulse (magnetostrictive measuring element – wave guide) inside a tubular cable
protection. From the current pulse, a radial magnetic field arises around the conductor.
The Position Transmitter (permanent magnet) is a non-contact and wear-free magnetic
measurement system, which produces an axial magnetic field with regard to the wire.
When the two magnetic fields meet at the measuring point moving radially from the
wire and axially from the magnet, then a torsion pulse will be generated.
The resulting torsion pulse spreads out from the sensor with constant ultrasonic speed,
moving along the waveguide in both directions. The ultrasonic sound signal is recorded
via a sensing element inside of the sensor head and converted into an electrical output
signal.
The measured delay between sending out the current pulse until the torsion pulse
arrives is converted into a proportional output signal which is made available via the
IO-Link interface.
Edition: 2022-03-08 HYDAC ELECTRONIC GMBH
HLT 2500-F1 IO-Link
Part no.: 670083