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A study of methods of constructing fixtures for testing low leak rate using the mass spectrometer leak detector
Classified Abstracts 145--159 order of 10 -a torr with a time lag of less than 100 ms. The gauge cannot be baked and is thus unsuitable for low pressure. (France) w. J. S. R. Dei-Cas and F. P. G. Valckx, Le Vide, 18 (I06), July/Aug. 1963, 408-411. 22 : 33 145. The elimination of resistive films in hot cathode ionization gauges. (Great Britain) L. de Csernatony, .J. Sci. Instrum., 40 (10), Oct. 1963, 504-505. 22 146. Vacuum pressure measurement. (Germany) W. Wuest, Arch. Tech. Messen, (322), Sept. 1963, 213-214. 22 : 33 147. A versatile 6 in. radius mass spectrometer for isotopic analysis of solids, liquids or gases. (U.S.A.) H. O. Finley et al., Nuclear Sci. Abstr., 17 (12), June 1963, 2657. 22 : 33 148. Small cheap mass spectrometer. Anon., R andD, (27), Nov. 1963, 31.
(Great Britain)
22 149. New universal gauges for low pressure ranges featuring magnetic linkage. (U.S.A.) Anon., Mech. Engng. N. Y., 85 (10), Oct. 1963, 159. 22 150. Mass spectrometric determination of ionization pressure gauge sensitivities. (U.S.A.) A new method for the calibration of ionization gauges is described for pressure measurements in gases other than nitrogen. Assuming the sensitivity of the gauges for this gas is unity, the following sensitivity factors for the gases named were obtained : A, 1.89 ; CO, 0.09 ; 02, 0.90 ; NO, 1.16. (U.S.A.) w. J. s. A. V. Anderson, Rev. Sci. Instrum., 34 (6), June 1963, 703-704.
23.
Plumbing
23 : 17 151. High vacuum insulated electrical feedthrough for use in cryostats. (U.S.A.) N. G. Einspruch and W. R. Wisseman, Rev. Sci. Instrum., 34 (8), Aug. 1963, 929-930. 23 152. An easily exchangeable lead-in electrmle used in high vacuum technique. (Great Britain) H. G. Franke and O. Krafft, J. Sci. Instrum., 40 (10), Oct. 1963. 502-503. 23 153. A cold high-vacuum seal without gaskets. (U.S.A.) L. Mancers, Proc. Inst. Elect. Electron. Engrs., 51 (9), Sept. 1963, 1250-1251.
81
24.
Valves
24 154. A thin vacuum gate valve of large aperture. (Japan) A sliding plate valve, approx. 2 in. thick and allowing a free aperture of approx. 4 in. is described together with its operating mechanism. (Japan) w. J. s. G. Horikoshi and J. Tanaka, Japan J. Appl. Phys., 2 (2), Feb. 1963, 135-136.
26.
Automatic Protective and Control Equipment
26 155. System for automatically regulating the supply of nitrogen traps. (U.S.S.R.) An electric heater in a Dewar flask containing liquid nitrogen builds up a pressure which forces liquid nitrogen out of the flask and through a pipe to a vapour trap. Nitrogen evaporating from the trap passes along an outlet pipe (which for part of its length surrounds the inlet pipe) and then escapes to atmosphere. In the path of the outflowing gas are two thermistors. One of these, if insufficiently cooled, actuates a relay which switches on the heater in the Dewar flask. If the nitrogen outflow ceases, due to exhaustion of the Dewar flask or to a blockage in the nitrogen line, the second thermistor operates a relay to disconnect the heater and actuate an alarm signal. The nitrogen outlet pipe is horizontal over the last few inches of its length. Mounted in a holder under the open end of the pipe is a third thermistor which is cooled only if liquid rather than gaseous nitrogen flows through the outlet pipe. This may occur if an excess pressure builds up in the Dewar flask; in this event, the thermistor actuates an electromagnetic pressure-reducing valve which otherwise seals off the neck of the Dewar flask. (U.S.S.R.) A.H.x. B. A. Ivanov, Instrum. & Exper. Tech., l,(Oct. 1963, 182-183). (Transl. from Pribory i Tekh. Eksp., 1, Jan.-Feb., 1963.) 27.
L e a k D e t e c t o r s and L e a k D e t e c t i o n 27
156. High vacuum leak detector. (Great Britain) Anon., Engineer, 216, (5618), 27 Sept. 1963, 529. 157.
27 Methods of applying the mass spectrometer leak detector.
(U.S.A.) D. Michel, Proc. Instrum. Soc. Amer., 18 (1), 1963, (No. 16263). 27 158. Leak technology. (U.S.A.) S. S. Robert et al., FluidHandl., (164), Sept. 1963, 315-318. 27 159. A study of methods of constructing fixtures for testing low leak rate using the mass spectrometer leak detector. (U.S.A.) G. C. Smith, Proc. Instrum. Soc. Amer., 18 (1), 1963, (No. 16163). 29.
Miscellaneous
Development and use of vacuum devices.
29 : 39 : 12 See Abstr. No. 112.
(Great Britain)
22 149. New universal gauges for low pressure ranges featuring magnetic linkage. (U.S.A.) Anon., Mech. Engng. N. Y., 85 (10), Oct. 1963, 159. 22 150. Mass spectrometric determination of ionization pressure gauge sensitivities. (U.S.A.) A new method for the calibration of ionization gauges is described for pressure measurements in gases other than nitrogen. Assuming the sensitivity of the gauges for this gas is unity, the following sensitivity factors for the gases named were obtained : A, 1.89 ; CO, 0.09 ; 02, 0.90 ; NO, 1.16. (U.S.A.) w. J. s. A. V. Anderson, Rev. Sci. Instrum., 34 (6), June 1963, 703-704.
23.
Plumbing
23 : 17 151. High vacuum insulated electrical feedthrough for use in cryostats. (U.S.A.) N. G. Einspruch and W. R. Wisseman, Rev. Sci. Instrum., 34 (8), Aug. 1963, 929-930. 23 152. An easily exchangeable lead-in electrmle used in high vacuum technique. (Great Britain) H. G. Franke and O. Krafft, J. Sci. Instrum., 40 (10), Oct. 1963. 502-503. 23 153. A cold high-vacuum seal without gaskets. (U.S.A.) L. Mancers, Proc. Inst. Elect. Electron. Engrs., 51 (9), Sept. 1963, 1250-1251.
81
24.
Valves
24 154. A thin vacuum gate valve of large aperture. (Japan) A sliding plate valve, approx. 2 in. thick and allowing a free aperture of approx. 4 in. is described together with its operating mechanism. (Japan) w. J. s. G. Horikoshi and J. Tanaka, Japan J. Appl. Phys., 2 (2), Feb. 1963, 135-136.
26.
Automatic Protective and Control Equipment
26 155. System for automatically regulating the supply of nitrogen traps. (U.S.S.R.) An electric heater in a Dewar flask containing liquid nitrogen builds up a pressure which forces liquid nitrogen out of the flask and through a pipe to a vapour trap. Nitrogen evaporating from the trap passes along an outlet pipe (which for part of its length surrounds the inlet pipe) and then escapes to atmosphere. In the path of the outflowing gas are two thermistors. One of these, if insufficiently cooled, actuates a relay which switches on the heater in the Dewar flask. If the nitrogen outflow ceases, due to exhaustion of the Dewar flask or to a blockage in the nitrogen line, the second thermistor operates a relay to disconnect the heater and actuate an alarm signal. The nitrogen outlet pipe is horizontal over the last few inches of its length. Mounted in a holder under the open end of the pipe is a third thermistor which is cooled only if liquid rather than gaseous nitrogen flows through the outlet pipe. This may occur if an excess pressure builds up in the Dewar flask; in this event, the thermistor actuates an electromagnetic pressure-reducing valve which otherwise seals off the neck of the Dewar flask. (U.S.S.R.) A.H.x. B. A. Ivanov, Instrum. & Exper. Tech., l,(Oct. 1963, 182-183). (Transl. from Pribory i Tekh. Eksp., 1, Jan.-Feb., 1963.) 27.
L e a k D e t e c t o r s and L e a k D e t e c t i o n 27
156. High vacuum leak detector. (Great Britain) Anon., Engineer, 216, (5618), 27 Sept. 1963, 529. 157.
27 Methods of applying the mass spectrometer leak detector.
(U.S.A.) D. Michel, Proc. Instrum. Soc. Amer., 18 (1), 1963, (No. 16263). 27 158. Leak technology. (U.S.A.) S. S. Robert et al., FluidHandl., (164), Sept. 1963, 315-318. 27 159. A study of methods of constructing fixtures for testing low leak rate using the mass spectrometer leak detector. (U.S.A.) G. C. Smith, Proc. Instrum. Soc. Amer., 18 (1), 1963, (No. 16163). 29.
Miscellaneous
Development and use of vacuum devices.
29 : 39 : 12 See Abstr. No. 112.