Patent ID: 8362905

Claim:
A retractable assembly, comprising: a sensor; an assembly housing; a tubular holder for said sensor guided in said assembly housing via a stroke movement linearly between a first position and a second position; and on-site electronics, a control/evaluation unit, wherein: said sensor ascertains a physical and/or chemical process variable in a process; said on-site electronics ascertains, as an actual value, or values, information concerning at least one other state variable of the retractable assembly, the process and/or said sensor; associated with said on-site electronics is a memory unit, in which the ascertained actual value, or values, is/are stored and/or predetermined, desired values are stored; on the retractable assembly at least one detector, which detects a stroke movement of said tubular holder in the retractable assembly; and said control/evaluation unit provides a number of accomplished stroke movements as actual values and/or generates a warning report, when the number of stroke movements reaches a number of stroke movements predetermined as a desired value.