A method for operating a measuring point, the measuring point and the sensor unit for such a measuring point

The method for operating a measuring point (1, 2, 3) comprising a base unit (11, 12, 13) and a sensor unit (21, 22, 23), the latter being coupled via a connector coupling with the base unit; the base unit for the energy supply of the sensor unit, for exchanging data with the sensor unit and for communicating with a process control system is used, wherein the base unit comprises: a first element of the connector coupling; a first microprocessor sensor data processing for communication to the process monitoring system (30, 31); a first data memory for storing measuring-point-specific data; wherein the sensor unit comprises a primary sensor and a sensor head; the primary sensor comprises a transducer, which outputs a measured size-dependent signal; wherein said sensor head comprises: a circuit for processing the transducer signals with an A / D converter and a second microprocessor for processing the measurement signal, a second data memory for sensor data; a program memory containing a firmware; and an interface with a second element of the connector coupling; wherein transmitted from the base unit to the sensor unit and a software module is stored in the program memory of the sensor unit, which enables additional functions to the primary sensor monitoring.