An apparatus (10) for measuring the location of a release line (17, 17a) of a paper web (14) from a rotating device (13) of a papermaking machine includes a distance measuring device (12a, 12b, 12c) repeatedly measuring the distance between the device (12a, 12b, 12c) and the paper web (14) as it passes a fixed point downstream of the rotating device (13). The measuring device (12A, 12B, 12C) communicates the measured distances to a data acquisition system (24) which calculates and monitors changes in the measured distances. The measuring device measures the transit time for a signal to travel from the measuring device to the paper sheet and back to the measuring device and calculates a measured distance from the measured transit time.
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