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Installation and Configuration Manual 5
Introduction
Installation Procedure Accuracy ConsiderationsElectrical ConnectionsIntroduction
Figure 1-3 Typical 3098 specific gravity measuring system
1.4 Definition of terms
1.4.1 Specific gravity
Specific gravity (G) is the ratio of the molecular weight of a gas (or gas mixture) to that of the
molecular weight of dry air; the molecular weight of dry air is normally assumed to be 28.96469 (see
Table 1-1).
SAFE AREA
HAZARDOUS AREA
Pressure
regulator
Isolation
valve
Valve A
Valve B
Gas for
calibration
Valve F
Safety
barrier
Vent to
atmosphere
Signal
converter
Valve C
Electrical cable
In
Out
for example
where M
G
= molecular weight of gas (or gas mixture)
and M
A
= molecular weight of dry air
G
M
G
M
A
--------=