New Phosphorimetric Sampling System And Subsequent Temperature Studies
New Phosphorimetric Sampling System And Subsequent Temperature Studies
Ward, Jimmie Lee
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The outer por- tion of the flask had a series of raised ridges, serving as bellows to prevent the breaking of the feed through tube on contraction of the inner surface. The LN 2 outlet tube was led back into the top of the dewar flask allowing the LN 2 to recirculate. The top of the flask was covered by a cap with a pressure relief valve to minimize frost formation in the dewar flask. The sample cells were of the same quartz tubing as used in conventional LTP but pieces were cut to 3 in. in len...gth and sealed at one end. Temperature measurements were made using an Omega Engineering (Stamford, CT) type WTJ-8 thermocouple with an Omega Engineering model MCJ Electronic Ice Point. Thermo- couple potentials were measured on a Keithley (Cleveland, OH) model 610 BR electrometer. Figure 12. Diagram showing the dewar flask, conduc- tion cooling arrangement. A. dewar flask B. drain to conduction cooling device C. liquid nitrogen D. cotton padding E. frost cap F. return tube from conduction cooling device G.
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