Nilfisk A/s

John Helgeson

A method of detecting a fill level in a debris basket of a cleaning machine include steps of initiating a wet cleaning mode, measuring a pressure differential between a vacuum compartment and a recovery tank, and determining a fill level of a debris basket in response to the measured pressure differential. The cleaning machine includes a scrubbing element mounted to the cleaning machine and engageable with a cleaning surface, a squeegee disposed to capture the debris removed from the cleaning surface by the scrubbing element, and a recovery tank assembly. The recovery tank assembly includes a recovery tank with a cavity disposed to collect liquid cleaning solution used during the wet cleaning mode, a squeegee hose fluidly connected to the recovery tank and disposed to deliver collected used liquid cleaning solution from the squeegee to the recovery tank, a debris basket disposed in the recovery tank and fluidly connected with the squeegee hose, and a vacuum compartment adjacent the recovery tank.

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Shoreview, MN, United States of America

John Helgeson