Patent ID: 11898567
Assignee: EDWARDS JAPAN LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 4:
5. The vacuum pump according to claim 4, comprising:
a plurality of deposited material sensors that are arranged, in the flow path, on an upstream side or a downstream side of a predetermined flow path position where a cause of disruption to operation of the vacuum pump is to occur, wherein
each of the plurality of deposited material sensors detects a presence or absence of deposited material at the arrangement position of the deposited material sensor, and
the controller: (a) selects, from the plurality of deposited material sensors, one deposited material sensor arranged at a position where the thickness of the deposited material at the predetermined flow path position assumes a predetermined thickness that corresponds to the maintenance time when the detection state changes from deposited material absent to deposited material present; and (b) detects the maintenance time based on the detection state of the selected deposited material sensor.