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62 Micro Motion 3098 Gas Specific Gravity Meter
Principles of Operation
Since conditions of constant volume and quantity exist for the reference gas, its density and molecular
weight are constant and from equation 5.
If now the two gases can be maintained at the same temperature, from equations 4 and 6:
Finally, by using the sample gas (or a gas having a similar supercompressibility factor) as the
reference gas:
Thus the density of the sample gas, under the stated conditions, is directly related to its molecular
weight and therefore directly related to its specific gravity by equation 1.
(6)
ρ
2
M
2
-------
P
2
Z
2
RT
2
------------------ K==
(7)
ρ
1
P
2
M
1
Z
1
RT
2
------------------ KM
1
Z
2
Z
1
------
==
(8)
since Z
1
= Z
2
ρ
1
KM
1
=