A thick layer gas sensor, fabricated in the Faculty of Microsystem Electronics and Photonics at Wrocław University of Technology has been used in the construction of a heat conductivity flowmeter. It was found, that about 60 % of the energy is dissipated from the heated sensor by heat conductivity of a surrounding gas at the atmospheric pressure. Two methods of the heater supply conditions have been studied: U=constant and T=constant. Measuring range of the designed heat coductivity flow-meter was 10(-2) W +20W.
This paper presents the results of the research on the imroved cryopump constructed on the basic of a two stage Gifford-McMahon refrigerator. The cryopump system without the screen of the second step element reached the pumping speed 4 m3/s for nitrogen and 0.8 m3/s for hydrogen. The effective pumping speed there are 1.5 m3/s and 0.75 m3/s respectively. The system make possible to reach the range of pressure 10-11 mbar during some hours of pumping.
The paper presents methods and results of the optimization of construction of Gifford-McMahon`s refrigerator. The optimized cooling system has the following parameters: final temperature 12 K, 2 nd stage refrigeration power 2.3 W at 20K, cooling speed dT/dt=13.6 K/s.
Gas adsorption and condensation has been investigated in a vacuum system. With a large cold surface. The flux of water emerging from stainless steel surface has been measured. During the investigation of hydrogen adsorption, the sorption capacity and binding energy on the cold surface have been evaluated.
Oil mist emitted by rotary vacuum pump contaminates the enyironment and atmosphere in technological rooms. The oil separator is a one of the effective means of reducing contamination quantity. The efficiency of separator with polypropylene fibber reaches 90 - 99,9%. Used as the 1-st stage of cleaning system, the separator extends the effective life times of charcoal output trap about 100 times.
Cryosorption pump used for generating ultra high, clean vacuum, is described. The pump PK-160M reaches 850 l/s pumping speed for nitrogen and 1000 l/s for hydrogen and makes possible to obtain ultimate pressure below 10(-10) mbar after l hour baking at 100° C.
The results of work on final temperature decrease of two-stage gifford-McMahon cryogenerator are presented. Due to increase of regenerator heat capacity and of the regenerator power, as well as optimization of the thermodynamic cycle the final cryogenerator temperature has fallen below 10 K.
Opisano układ separacji oleju z gazu roboczego sprężanego przez konwencjonalne kompresory tłokowe. Dwustopniowy układ zawiera wykraplacz oleju chłodzony wodą oraz separator kapilarny. Wydzielony w wyniku separacji olej powraca do kompresora. Przetestowano i pokazano wyniki badań dwu rodzajów separatorów kapilarnych. Stosując separator z włókien sztucznych uzyskano skuteczność 99,997%.
EN
The oil removal system for the output gas from piston compressor is described. Two stage system contains the water cooled dropwise condensator and capillary oil separator. Oil secreted from gas comes back to compressor. Investigation of two separator designs has been made. In the system containing artificial fiber the separation efficiency of 99,997% has been obtained.
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