LABORATORY ANALYSER OF GAS DENSITY Russian patent published in 2014 - IPC G01N9/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to facilities of analytical laboratory equipment, namely, to gas density analysers. A laboratory gas density analyser comprises a miniature turbulent narrowing device, the inlet of which is connected via a tee with a chamber for compression of analysed gas, made in the form of a spiral from a thin-walled metal tube, and the outlet of a measurement chamber of a pressure indicator, one of walls of which is made in the form of an elastic membrane, and its inlet is connected via a valve with a line of analysed gas. Also the analyser comprises a pneumatic tumbler connected to the outlet of the turbulent narrowing device, a syringe, the inlet channel of which is connected with the outlet channel of the chamber for compression of analysed gas, and the body is equipped with a nozzle, location of which is provided by the possibility to create a through chamber from the syringe as the piston is advanced to the maximum, a metre of time intervals with connecting and disconnecting inlets. At the same time the analyser additionally comprises a piezoresistive converter of force into an electric signal arising on an elastic membrane, electronic comparators of maximum and minimum signals of the piezoresistive converter and a reservoir with cooling liquid, where the chamber is located for compression of analysed gas. Besides, the outlet of the piezoresistive converter is connected with inlets of comparators, the outlet of the comparator of the maximum signal of the piezoresistive converter is connected to the connecting inlet of the metre of time intervals, and the outlet of the comparator of the minimum signal of the piezoresistive converter is connected to the disconnecting inlet of this metre.

EFFECT: increased accuracy of measurement of gas density.

1 dwg