Measurement procedures for the safe determination of the distance of a conductive reaction rail from a functional surface moving relative to the reaction rail and suitable sensor for this purpose

摘要

The measuring system provides the distance between a conductive reaction rail and a relatively displaced function surface via a sensor supported by the function surface in which an AC field is generated dependent on the relative spacing. The sensor incorporates a pair of signal generators each providing distance information from the detected AC field parameter, processed via independent measuring channels and compared to provide a validity check.