Honeywell SmartLine Multivariable SMV800 Series User Manual page 291

B.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
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pressure
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density
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discharge coefficient (gas, liquid, or steam)
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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.
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
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Air
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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 61 show how to configure the SMV to calculate the PV4 flow variable for this
application.
Revision 6.0
SMV800 Transmitter User's Manual
Page 279