Patent ID: 7338426

Claim:
A centrifugal separator for separating dirt particles from a fluid, said separator comprising a rotatable separator cylinder which is arranged in a separator housing and into which the fluid to be cleaned is introduced, and a rotation detector which indicates rotational movement of the separator cylinder, wherein said detector comprises an at least approximately radially extending guide tube in which a detection element is accommodated such that the detection element can be outwardly displaced within the guide tube under the influence of centrifugal force as the separator cylinder rotates, said detection element being moveable between a normal position which the detection element assumes during normal operation of the centrifugal separator and a contamination position which the detection element assumes when an unacceptably high level of contamination exists in the centrifugal separator; wherein the guide tube forms an angle with a plane perpendicular to the rotational axis of the separator cylinder, and wherein the guide tube slopes downwardly toward the rotational axis of the separator cylinder.