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The McLeod compression manometer

The principle of this manometer, which gives a reliable reading only for permanent gases, is the compression of a certain volume of the gas, measured at the pressure to be determined, to a small volume in a capillary tube. The gas sample is in this way brought to a higher pressure that can readily be measured. The pressure p of the original gas can then be calculated with sufficient accuracy by means of the formula [Pg.459]

Ah = the pressure at which the compressed gas is finally measured (the difference in mercury level in mm), [Pg.459]

Fj = the volume of sphere G and capillary tube K (measured from the junction at R), Fj = the volume of the compressed gas in capillary tube K. [Pg.459]

Volume of sphere and required amount of mercury in commercial McLeod gauges [Pg.460]

The numerous modifications of the McLeod manometer are dealt with in Ebert s book [51]. A pneumatically controlled model with automatic setting which is independent of the atmospheric pressure is described in detail by Peche [52]. A number of recommendations are made which are intended to ensure reproducible measurements. [Pg.460]


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