Tracked Changes. Workplace atmospheres. Electrical apparatus used for the direct detection and direct concentration measurement of toxic gases and vapours. Guide for selection, installation, use and maintenance|Spectrophotometry, Training, Maintenance, Gas detectors, Infrared radiation, Electrochemical devices, Potentiometric methods, Accuracy, Luminescence, Dangerous materials, Inspection, Electrical equipment, Measurement characteristics, Storage, Industrial air pollutants, Transportation, Electrical safety, Gases, Personnel, Gas analyzers, Chemical analysis and testing, Selection, Electrical conductivity, Sampling methods, Colorimetry, Mass spectrometry, Instructions for use, Toxic gases, Testing conditions, Gas analysis, Heat measurement, Photometry (chemical analysis), Gas chromatography, Performance, Occupational safety, Semiconductor devices, Installation, Emission spectrophotometry, Thermal conductivity, Calibration, Environment (working), Vapours, Electro-analytical methods, F