Gas measuring device with automatic configuration detection and configuration process

An arrangement comprising:

• a gas measuring device, the gas measuring device comprising:
• a base part;
• a gas sensor configured to measure a respective value of at least one detection variable which correlates with a concentration of at least one target gas;
• a signal-processing evaluation unit configured to evaluate the measured value for the detection variable and to determine a target gas concentration or a summed concentration of target gases based on the evaluation of the measured value;
• and
• at least one reader;
• and
• at least one expansion module configured to be detachably connected to the base part, the expansion module comprising an expansion module data memory in which an identifier of the expansion module is stored,
• wherein the reader is configured to contactlessly read out the expansion module data memory in a state with the expansion module connected to the base part,
• wherein the gas measuring device is configured to determine, depending on a signal from the reader, whether or not the expansion module is connected to the base part and, upon determining the expansion module is connected to the base part, to determine the stored identifier and, depending on a presence of the stored identifier and/or a type of the stored identifier, to trigger a procedure.