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Reference Manual
00809-0100-4832, Rev AA
October 2004
Rosemount 3095FC
3-28
Gas Quality Tab
See Figure 3-21 on page 3-28
Gas Quality defines the mole percentage of twenty gas components, the
Heating Value Basis, the Heating Value, and the Specific Gravity.
NOTE
Entering Hexane+ (C
6
+) and the mole percent of hexane+ will automatically
distribute among hexane, heptane, octane, nonane, and decane as specified
by the heavy gas distribution parameters under the Advanced tab (“Advanced
Meter Setup Tab” on page 3-29.
1. Select Meter > Setup > Gas Quality tab.
2. Enter the mole percent of each Gas Component, or use the default
values of 96% methane, 3% ethane, and 1% nitrogen. The Total Mole
% should equal 100%. If changes are applied to the device when the
Total Mole % does not equal 100%, the composition will be adjusted
based on the Normalization Type selected.
3. Select Log Methane Adjust Enabled if the percentages are
automatically adjusted to total 100.
4. Select the Heating Value Basis. If Dry or Wet is selected, select
Calculate for the Heating Value parameter (the heating value is
always calculated on a dry basis). If As Delivered is selected, select
Enter for the Heating Value parameter and provide the value.
5. Select either Calculate or Enter for the capacity Heating Value of a
specified quantity of gas. If Calculate is chosen, the Heating Value is
calculated from the gas composition data. If Enter is chosen, the
value entered will be used in the heating value calculation. Use the
units button to toggle between volume or mass measurement U.S
units are BTU/Cf or BTU/Lb and the metric unit are MJ/m3 or MJ/Kg.
6. Select either Calculate or Enter for the Specific Gravity to specify the
ratio of the molar mass of the gas to the molar mass of air. If
Calculate is selected, the specific gravity is calculated from the gas
composition data at standard conditions of 14.73 PSIA and 60 °F. If
Enter is selected, the value entered for standard conditions is used.
Figure 3-21. Meter Setup Gas
Quality Tab Screen