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C.l.f. Woodcock - One of the best experts on this subject based on the ideXlab platform.
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A device for the automatic regulation of backing pressure in Vacuum Systems
Micron, 2002Co-Authors: G.f. Drake, C.l.f. WoodcockAbstract:Abstract An addition to a conventional two-stage Vacuum system is described which allows operation with the forepump off for extended periods of time, thus providing vibration-free conditions. A thermocouple gauge, ballast tank, and isolation valve are placed between the forepump and the diffusion pump, and circuitry provided to monitor the Vacuum level, and turn the pump on or off as required. Details of the installation for an RCA EMU4 electron microscope are given.
Brad A. Debban - One of the best experts on this subject based on the ideXlab platform.
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Mercury vapor levels in exhaust air from dental Vacuum Systems
Dental Materials, 2006Co-Authors: Mark E. Stone, Mark E. Cohen, Brad A. DebbanAbstract:OBJECTIVE: This study was undertaken to determine mercury (Hg) vapor levels in the air exhausted from dental Vacuum Systems. METHODOLOGY: Hg vapor concentrations from the dental Vacuum system exhaust ports of three dental clinics were measured utilizing the Jerome 431-X mercury vapor analyzer and the United States Occupational Safety and Health Administration's (OSHA) method ID-140 in units of ng Hg/m3. Air velocity measurements and temperatures were determined with a constant temperature thermal anemometer. Hg emissions per unit time were then calculated in ng Hg/min. Ambient Hg concentrations from a location approximately 1000 feet away from the closest clinic sampled in this study were measured with an Ohio Lumex Inc. RA-915+ Hg vapor analyzer. RESULTS: Mean Hg vapor concentrations analyzed with the Jerome 431-X were: 46,526, 72,211, and 36,895 ng/m3 for clinic I (110 chairs), clinic II (30 chairs) and clinic III (2 chairs), respectively. Mean Hg vapor concentrations utilizing OSHA method ID-140 were 45,316, 73,737, and 35,421 ng/m3, respectively. Air flow values were: 11.6, 1.8, and 0.5 standard m3/min, respectively. Hg emission data utilizing air flow measurements were calculated to be 532,684, 131,353, and 18,079 ng/min, respectively, (P
G.f. Drake - One of the best experts on this subject based on the ideXlab platform.
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A device for the automatic regulation of backing pressure in Vacuum Systems
Micron, 2002Co-Authors: G.f. Drake, C.l.f. WoodcockAbstract:Abstract An addition to a conventional two-stage Vacuum system is described which allows operation with the forepump off for extended periods of time, thus providing vibration-free conditions. A thermocouple gauge, ballast tank, and isolation valve are placed between the forepump and the diffusion pump, and circuitry provided to monitor the Vacuum level, and turn the pump on or off as required. Details of the installation for an RCA EMU4 electron microscope are given.
E.a. Cornell - One of the best experts on this subject based on the ideXlab platform.
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Teflon feedthrough for coupling optical fibers into ultrahigh Vacuum Systems.
Applied optics, 1998Co-Authors: E R Abraham, E.a. CornellAbstract:We present an inexpensive, reusable method of introducing optical fibers into ultrahigh Vacuum Systems. A Teflon ferrule with a center-drilled hole slightly larger than the fiber diameter replaces the metal ferrules of a standard Swagelok connector. The Swagelok connector when tightened compresses the Teflon to form a Vacuum seal for pressures of
W. Schmidt - One of the best experts on this subject based on the ideXlab platform.
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Residual Gases in Vacuum Systems
Vacuum Technology Transactions, 2013Co-Authors: A. Klopfer, S. Garbe, W. SchmidtAbstract:Investigations of the gas composition in sealed-off high and ultra-high Vacuum Systems with the aid of the omegatron have shown that the gas evolution of the materials and interactions between the gases and the surfaces determine the kind of gases which are present. Such interactions are: absorption, chemical and exchange reactions. The results obtained on radio tubes, television picture tubes and Systems consisting of glass and metal only are given in this paper. It appears possible to classify the composition of residual gases on the basis of the conditions prevailing in the Systems in question.
