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Portable "Senson-V-4000" are designed to ensure personal safety of employees of enterprises, production processes of which are associated with the possibility of emission of combustible, toxic and other dangerous gases into the atmosphere, as well as the lack or excess of oxygen. Gas analysers can be used for monitoring of atmospheric air, air of working zones, industrial zones of enterprises, workplaces and other premises. Depending on the sensor type, the analyser can monitor the concentration of one to five gases. The measured concentration is displayed on a colour digital display. When the concentration value exceeds the set thresholds, the device produces sound, light and vibration signals.