INSTRUMENTS TELEDYNE HASTINGS APPLICATION NOTES http://www.teledyne-hi.com Goal: Portable Gas Blending System The customer required a gas blending system that combined two gases in a ratio of true mass flow units (lbs/hr, SCFM, SLPM) for flow rates up to 1000 SCFH. The system was required to be portable and self- contained in a rugged wheeled case, with displays of the flow rates of each gas in engineering units. The selected mass flowcontrollers

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