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1/99 SMV 3000 Transmitter User’s Manual 181
C.3 Dynamic Compensation Flow Equation
Dynamic
Compensation Flow
Equation
The Dynamic Compensation Flow Equation provides algorithms for use in
determining a highly accurate PV4 flow variable for SMV 3000. Use
dynamic compensation to measure liquids, gases, and steam.
Dynamic compensation flow equation compensates for:
• temperature
• pressure
• density
• discharge coefficient (gas, liquid, or steam)
• thermal expansion factor
• gas expansion factor
NOTE: A standard flow equation is also available which uses an empirical method of
calculation for PV4, thereby compensating only for temperature and pressure
changes in gas and steam applications. See Subsection C.2.
Dynamic
Compensation
Configuration
Examples
The following pages contain three examples for configuring the SMV PV4
output using the Flow Compensation wizard in the SCT 3000
configuration program. The configuration examples show how to navigate
through the wizard program and enter values to configure the SMV PV4
flow variable for a given flow application. Examples for the following
applications are presented:
• Liquid Propane
• Air
• Superheated Steam
The Dynamic Compensation Flow model wizard in the SCT 3000
program is launched from the Equation Model page of the Flow
Compensation Wizard.
Example: Liquid
Propane
An engineer has specified a SMV 3000 Smart Multivariable Transmitter
to dynamically compensate and calculate the mass flowrate of liquid
propane through a standard 304 SS orifice meter with flange taps. The
engineer has sized the orifice meter to produce a differential pressure of 64
inches H2O at 555.5 lb/m. The flowing pressure is 314.7 psia and the
flowing temperature is 100 degrees F.
The steps in Table C-3 shows how to configure the SMV to calculate the
PV4 flow variable for this application.
Continued on next page