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  • Central gas system alarms designed to activate audible (i.e., sound) and/or visual alarms when the pressure (including partial vacuum level) of a central gas system line is outside (e.g., 20%) predetermined normal system pressure values. These devices typically consist of an independent electronic unit, pressure sensors, amplifiers, pressure level controls, and visual displays and/or audible warnings that may be located at the site and/or in a central station. Pressure alarms are used to warn users of abnormal conditions in the delivered gas pressures; alarms are also available for use at the central gas station to determine its status.
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