A submersible pump includes an impeller arranged in a pump housing. On detection of a modification of the routing topology, at the level of a first node connected by a link to at least one second node, a timer value associated with the second node is determined. A plurality of differing photoresist materials are used in the process. The original templates are not replaced but those templates that are automatically stored are replaced at intervals. The controller further determines if there is a leak in the exhaust passage based on the correction value.