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CGA E-7-2018
Standard for Medical Gas Pressure Regulators, Flowmeters, and Orifice Flow Selectors - 5th Edition
Applies to cylinder gas-pressure regulators; pressure regulators with integrated flowmeter devices; medical gas flowmetering devices (flowmeters); pressure regulator/flowmeter and pressure regulator/flowgauge combinations; and orifice flow selectors used in the administration of medical gases for treatment, management, diagnostic evaluation, and care of patients. A pressure regulator and flowmeter used in combination shall meet the minimum requirements for each device.
Compressed Gas Association, Inc. [cga]