The present invention relates to a microcontroller including a central processing unit, at least one memory, a bus coupling the storage location to the central processing unit, and a data modification module for modifying data in the at least one memory. The apparatus receives information from a customer concerning a specific function, which the customer wants to perform at the remote equipment. An introducing passage for introducing lubricant oil in the oil separation chamber to the auxiliary oil reservoir chamber is formed in the peripheral wall. A removable elastomeric seal means is provided across each of the first and second ends. A quality of the head can then be determined based on the first and second values.