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1/99 SMV 3000 Transmitter User’s Manual 177
C.2 Standard Flow Equation, Continued
Example: Air Through
a Venturi
An engineer has specified a SMV 3000 Smart Multivariable Transmitter
to compensate for air density changes and to calculate the standard
volumetric flowrate of air through a Venturi meter. The engineer has sized
the Venturi meter to produce a differential pressure of 49 inches H
2
O at
630 CFM at standard conditions. The flowing pressure is 129.7 psia,
flowing temperature is 100 degrees F, and the standard (base) density is
0.0764 lbs/ft
3
.
The steps in Table C-1 show how to configure the SMV to calculate the
PV4 flow variable for this application.
Table C-1 Air Through a Venturi Meter Configuration Example
Step Action
1
Select a template for the SMV 3000 model you have for your flow
application.
Select standard volume 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 Standard from the Equation Model list box on the Equation
Model page of the Flow Compensation Wizard to launch the Kuser
Model, then click Next to proceed to the Fluid Type page.
4
Select Gas as the fluid type from the list box on the Fluid Type page,
then Next to proceed to the Gas Flow Type page.
5
Select Standard Volume as the gas flow type from the list box on the
Gas Flow Type page, then click Next to proceed to the Process Data
page.
Continued on next page