Measuring device e.g. for control and/or automisation of complex process, uses identical line pairs for signal current representating measured value and operating current for measuring device

摘要

The measuring device (61) is coupled to a first line pair (1) exhibiting a signal current representing the measured value and a second identical line pair (3), for providing an operating current for the measuring device, having a value which lies between the minimum and maximum signal current. An independent claim for a measuring system with at least one measuring device is also included.