Type of Document	Master's Thesis
Author	Fletcher, J. Robert
URN	etd-07212010-020128
Title	The development of an instrument to control the oxygen concentration and flow rate of an air-oxygen mixture.
Degree	Master of Science
Department	Mechanical Engineering
Advisory Committee	Advisor Name Title Arp, L. J. Committee Chair Brown, Eugene F. Committee Member Mabie, Hamilton H. Committee Member
Keywords	Gas flow
Date of Defense	1977-10-05
Availability	restricted
Abstract The equipment as designed and constructed is a workable solution to the problem of mixing air and oxygen at selectable oxygen concentrations and flow rates. Control of the flow of the individual gases is adequate with the metering elements as designed. The laminated brass stock and shim stock is easily fabricated and works well. The mechanical linkage is the weakest link in the design. The hysteresis in setting concentration and the inaccuracies in setting concentration are primarily related to poor design in the linkage. Ways to possibly improve the linkage are discussed in the Recommendation section of this thesis. The only problem with the read-out design is at low flow rates, i. e., less than 5000 cm3/min (5 -(min)) the scale sticks at times.
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