Rpm detector for servicing IC engine, etc.

摘要

The device includes an ultrasound sensor (12) which is connected to an evaluation unit, and is joined by a clamping arrangement (20) to a fuel inlet pipe (L1-L4) of the engine (B) in such a way that it is acoustically coupled with the fuel pipe. The clamping arrangement is formed of a tube (60). An elongated pull element (64) with good sound conductivity is arranged in the interior of the tube. The pull element is movable, along with a pull arrangement (66) in the longitudinal direction of the tube. The ultrasound sensor is mounted at the outer wall of the tube, so that it is acoustically coupled with the pull element.