42 [ Development of industrial sensors, in particular optical, electronic, optoelectronic, photoelectric apparatus and systems, in particular for analysis and process measuring technology; Development of transmissiometers, namely, opacity monitors and dust monitors, scattered light meters, spectrometers, photometers, gas analyzers; Development of emission measuring, process analysis, process control, identification and data transmission apparatus with an electronic and/oroptoelectronic base, namely, dust monitors based on transmission light, scatter light, or combinations of transmission light and scatter light; Planning of technical systems based on industrial sensors, in particular optical, electronic, optoelectronic, photoelectric apparatus and systems, in particular for analysis and process measuring technology; Planning of technical systems based on transmissiometers, namely, opacity monitors and dust monitors, scattered light meters, spectrometers, photometers, gas analyzers; Planning of technical systems based on emission measuring, process analysis, process control, identification and data transmission apparatus with an electronic and/or optoelectronic base, namely, dust monitors based on transmission light, scatter light, or combinations of transmission light and scatter light; Calibration and function testing of technical systems with a base of industrial sensors, in particular optical, electronic, optoelectronic, photoelectric apparatus and systems, in particular for analysis and process measuring technology, within the framework of final inspection before commissioning; Calibration and function testing of transmissiometers, namely, opacity monitors and dust monitors, scattered light meters, spectrometers, photometers, gas analyzers, within the framework of final inspection before commissioning; Calibration and function testing of emission measuring, process analysis, process control, identification and data transmission apparatus with an electronic and/or optoelectronic base, namely, dust monitors based on transmission light, scatter light, or combinations of transmission light and scatter light, within the framework of final inspection before commissioning; all the aforesaid services for others, for a fee ]