Method for calibration, and measurement and analysis method

A method for a multistep calibration of a portable gas measuring device having a detector unit for gas chromatography for selective detection of a plurality of chemical compounds that is connected to a control unit and an analysis unit, the method comprising:

• performing a two-part calibration comprising:
• in a first part of the two-part calibration that is performed in a factory, performing a factory setting of at least one of the portable gas measuring device and a device associated with the portable gas measuring device and generating a database that comprises values for a plurality of target materials and/or values for a plurality of measuring programs for the portable gas measuring device, and
• in a second part of the two-part calibration that is performed by at least one user in the field, connecting at least one container having a known gas standard to the portable gas measuring device by the at least one user and performing a reference measurement on the known gas standard, wherein a multidimensional reference measurement is recorded,
• selecting, by the at least one user in the field, a measuring program for one or more target materials from a list of measuring programs that were installed on the device by a producer or prepared by the at least one user, the measuring program being a controlled sequence of measuring,
• performing a measurement by the portable gas measuring device on a sample, wherein the control unit executes the measuring program in dependence on the selected measuring program, wherein a multidimensional measured variable is recorded,
• automatically performing an analysis by the analysis unit to identify at least one of the one or more target materials that is present in the sample and the respective concentrations thereof, wherein the analysis is based on:
• the factory calibration for the portable gas measuring device and the values for the plurality of target materials and/or the values for the plurality of measuring programs from the first part of the two-part calibration,
• the multidimensional reference measurement for the gas standard from the second part of the two-part calibration, and
• the multidimensional measured variable from the measurement on the sample, and
• repeating the second part of the two-part calibration by the at least one user in the field prior to performing at least one subsequent sample measurement by connecting the at least one container having the known gas standard to the portable gas measuring device by the at least one user and repeating the reference measurement on the known gas standard.