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Title: Specific Gravity Instruments - Care And Operation
Author: L. W. Dunn
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: This gravitometer is a direct weighing type instrument and is constructed to measure the difference in the weight of a column of gas and an equal column of dry air. This difference is transmitted to a chart on which is recorded the specific gravity of the gas passing thru the instrument. This instrument consists of an air bell and gas bell, both identical and suspended at equal distances from the fulcrum of the balance beam. The purpose of the air bell is to compensate for the weight of the gas bell and the surface tension of the sealing liquid in which the two bells are suspended. The interior space of the air bell is open to the atmosphere thru an air inlet and outlet which contain a drying agent. The interior space of the gas bell is open to the atmosphere thru its outlet and the gas supply is admitted thru its inlet. Two vertical tubes of adequate height to obtain the required working force on the bells are connected at their bases to the inside space of the bells. The movement of the bells is transmitted thru the balance beam of the recording mechanism.

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