Arrangement in a Perforated Roll of a Fiber Web Machine and Prefabricated Sensor Sheet for a Perforated Roll of a Fiber Web Machine

A prefabricated sensor sheet for mounting to a perforated roll of a fiber web machine, the prefabricated sensor sheet comprising:

• a background adapted to support the sensing system for its installation to the perforated roll;
• at least two parallel flat leads arranged on the background and adapted to form at least one pair of leads;
• at least one sensor connected to the pair of leads;
• and
• a sensing system of a specific dimension is adapted to be cut from the prefabricated sensor sheet, which sensing system can be fastened to an installation surface formed on the roll shell of the perforated roll.

A perforated roll for a fiber web machine, comprising:

• a cylindrical roll shell having an outer surface, wherein portions of the roll shell define a plurality of first holes of a first diameter which extend through the outer surface and the roll shell;
• a first flat lead extending over the outer surface of the roll shell such that at least one of the plurality of first holes extends through the first flat lead;
• a second flat lead alongside and spaced from the first flat lead and extending over the outer surface of the roll shell such that at least one of the plurality of first holes extends through the second flat lead;
• and
• one or more sensors which are connected to the roll shell and connected between the first flat lead and the second flat lead.