Patent ID: 6029501
Filing Date: 2000-02-29
Classification: G01N

Abstract:
A vibration gas density meter comprising:a cylindrical resonator;a cylinder block concentrically incorporating said cylindrical resonator so that one end of said cylindrical resonator is fixed to a bottom block of said cylinder block in a cantilever-like manner and another end of said cylindrical resonator is open ended;vibratory means for exciting said cylindrical resonator;an inside flow way provided for said cylindrical resonator having a cross section which is ring shaped and is provided at said bottom block of said cylinder block for supplying a sample gas to an inner cylindrical surface of said cylindrical resonator;one or more outside flow ways provided for said cylindrical resonator through said bottom block of said cylindrical block and arranged on an outside circumference of said inside flow way and avoiding said vibratory means for supplying sample gas to an outer cylindrical surface of said cylindrical resonator;a case concentrically incorporating said cylinder block including both ends thereof;first and second elastic elements disposed between both ends of said cylinder block and said case, respectively, so that said cylinder block is supported by said case in a cylindrical axis direction and that gaps between said cylinder block and said case are sealed by said first and second elastic elements; andthird and fourth elastic elements disposed between outer cylindrical surfaces on both end face sides of said cylindrical block and said case, respectively, so that said cylinder block is supported by said case in a radial direction and that gaps between said outer cylindrical surfaces of said cylinder block and said case are sealed,whereby said cylindrical resonator and said cylindrical block are held in a free-standing ambient vibration free and noise free position within said case; andwhereby sample gas is introduced at one end of said inside flow way and split to flow into said one or more outside flow ways so as to eliminate contamination of sample gas and to enable a more accurate measurement of the sample gas without said sample gas being diverted in direction.