Sensor device and expansion module

A sensor device for process variable determination in an industrial environment, comprising:

• a sensor base and a first expansion module, the sensor base including:
• processing circuitry configured to determine the process variable,
• a first mechanical interface that mechanically receives the first expansion module, and
• a first communication interface that interfaces to the first expansion module and that transmits measurement and/or control data,
• wherein the first expansion module includes:
• a second mechanical interface that interfaces to the sensor base,
• a third mechanical interface that mechanically receives a second expansion module,
• a second communication interface that interfaces to the sensor base and that transmits measurement and/or control data, and
• a third communication interface that interfaces to the second expansion module and that transmits measurement and/or control data.