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Introduction 3098 Technical Manual
1-2
1.1 Specific Gravity Measurement
Most major gas flow metering systems require the metered quantity to be presented in Heat or standard volume units. To
achieve this requirement, it is often necessary to make continuous and accurate measurements of specific gravity.
Specific gravity can be evaluated by relating the molecular weight of the gas (or gas mixture) to that of the molecular
weight of air, or by evaluating the relative density of the gas (or gas mixture) and compensating the result for the Boyle’s
Law deviation on both the gas (or gas mixture) and the air.
The 3098 Specific Gravity Meter adopts a combination of these two methods, where, by measuring the density of the gas
under controlled conditions, the value of density obtained is directly related to the molecular weight of the gas, and thus to
its specific gravity.
Figure 1-1: View of the 3098 Specific Gravity Meter
installed in a typical enclosure