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Compressed air monitors designed to measure and display simultaneously several gas concentrations. These monitors typically include sensors (e.g solid state, electrochemical, infra-red), electronic circuitry, and a display; they may also include alarms, recording capabilities, and/or a transmitter for remote central monitoring. Multigas compressed air monitors are used for continuous measuring the concentration of gases (e.g. oxygen, carbon monoxide, nitrogen oxide, nitrogen dioxide).
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