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186 SMV 3000 Transmitter User’s Manual 1/99
C.3 Dynamic Compensation Flow Equation, Continued
Table C-4 Air Configuration Example, continued
Step Action
6
Select Standard Volume as the type of gas flow from the list box on
the Gas Flow page, then click Next to proceed to the Fluid page.
7
Select AIR as the type of fluid from the list box on the Fluid page, then
click Next to proceed to the Pipe Properties page.
8
Enter the relevant information from the Orifice Sizing Data Sheet in
each entry field of the Pipe Properties page:
Pipe Schedule = 40s
Nominal diameter = 3 inches
Material = Carbon Steel
• The actual diameter and thermal expansion coefficient for the
pipe are automatically calculated based on the entered data.
Click Next to proceed to the Discharge Coefficient page.
9
Enter the following lower and upper Reynolds number limits in each
entry field of the Discharge Coefficient page. These values are used
to clamp the discharge coefficient equation at these Reynolds
numbers:
Lower Limit = 10,000
Upper Limit = 100,000
• Graph coordinates (Reynolds Number vs. Discharge Coefficient)
will appear when the mouse is clicked on the graph.
Click Next to proceed to the Viscosity Compensation page.
10
Enter the following equation order (order 4 is recommended) and
temperature limits for the viscosity compensation in each entry field of
the Viscosity Compensation page. The viscosity values will be
clamped at the temperature limits.
Order = 4
Low Temp = 50
High Temp = 150
Click Yes to refit the curve with the new limits.
• Graph coordinates will appear when the mouse is clicked on the
graph.
Click Next to proceed to the Density Variables page.
Continued on Next page