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1/99 SMV 3000 Transmitter User’s Manual 185
C.3 Dynamic Compensation Flow Equation, Continued
Example: Air
An engineer has specified a SMV 3000 Smart Multivariable Transmitter
to dynamically compensate and calculate the standard volumetric flowrate
of air through a standard 304 SS orifice meter with flange taps. The
engineer has sized the orifice meter to produce a differential pressure of 10
inches H
2
O at 175 standard cubic feet per minute (SCFM). The flowing
pressure is 40 psia, the flowing temperature is 60 degrees F, the flowing
density is 0.2079 lbs/ft
3
, and the standard density if 0.0764 lbs/ft
3
.
The steps in Table C-4 shows how to configure the SMV to calculate the
PV4 flow variable for this application.
Table C-4 Air Configuration Example
Step Action
1
Select a template for the SMV 3000 model you have for your flow
application.
Select Standard Volumetric flow in the Algorithm field of the FlowAlg
tab and then select the Engineering Units (CFM) on the FlowConf tab
card.
2
Click the Wizard . . .
on the SCT/SMV 3000 configuration window to
access the Flow Compensation Wizard Equation Model page.
3
Select Dynamic Corrections from the list box on the Equation Model
page of the Flow Compensation Wizard to invoke the Dynamic Flow
Compensation Model, then click Next to proceed to the Flow Element
Properties page.
4
Enter the relevant information from the Orifice Sizing Data Sheet in
each entry field of the Flow Element Properties page:
Element Type = Flange tap
(D Greater than 2.3 inches)
Bore Diameter = 1. 5698 inches
Material = 304 SS
Flowing Temperature = 60°F
• The expansion coefficient is automatically calculated based on
the entered data.
Click Next to proceed to the Fluid State page.
5
Select the fluid state as Gas from the list box on the Fluid State page,
then click Next to proceed to the Gas Flow page.
Continued on Next page