Process for monitoring a drainage element

A machine for manufacturing a fibrous web from a fibrous suspension, said machine having a running direction and a sheet forming area, said machine comprising:

• at least one suction box, each said Suction box including a main box having at least one connection associated therewith configured for connection with at least one vacuum source, each said connection including a line;
• at least one porous fabric motivating the fibrous web through the sheet forming area in close proximity to at least one said suction box, said porous fabric having two edge zones, each said edge zone being parallel to said running direction and located on an outer edge of said porous fabric;
• at least one suction box covering connected to each said suction box, each said suction box covering including at least two drainage elements disposed laterally to said running direction, said at least two drainage elements border a suction slit, each said drainage element including a drainage element main body, at least one drainage element ceramic and at least one drainage element adhesive point joining said drainage element main body and said at least one drainage element ceramic;
• a format slide located in each said edge zone of each said suction slit including a format slide main body, at least one format slide ceramic and at least one format slide adhesive point joining said format main body to said at least one format slide ceramic,
• at least one removable edge piece connected to at least one of said format slide and said at least one drainage element;
• and
• at least one temperature sensor connected to said at least one edge piece.