Reference K-Factor - Emerson Rosemount 8800D Series Reference Manual

Reference Manual
00809-0400-4004
Set process fluid
Select the fluid type—either Liquid, Gas/Steam, Tcomp Sat Steam, or Tcomp Liquids.
Tcomp Sat Steam and Tcomp Liquids require the MTA Option and provide dynamic
density compensation based on the process temperature reading.
Fixed process temperature
Needed for the electronics to compensate for thermal expansion of the flow meter as the
process temperature differs from the reference temperature. Process temperature is the
temperature of the liquid or gas in the line during flow meter operation.
May also be used as a back-up temperature value in the event of a temperature sensor
failure if the MTA option is installed.
Fixed process density
A Fixed Process Density must be accurately configured if mass flow or corrected volume
flow measurements are used. In mass flow it is used to convert volume flow to mass flow.
In corrected volume flow it is used with the base process density to derive a density ratio
which in turn is used to convert volume flow to corrected volume flow. In temperature
compensated fluids the fixed process density is still required as it is used to convert
volume flow sensor limits to sensor limits for temperature compensated fluids.
Note
If mass or corrected volume units are chosen, you must enter the density of your process
fluid into the software. Be careful to enter the correct density. The mass flow rate and
density ratio are calculated using this user-entered density, and unless the transmitter is in
TComp Sat Steam or TComp Liquids mode where changes in density are automatically
being compensated for, any error in this number will cause error in the measurement.
Base process density
The density of the fluid at base conditions. This density is used in corrected volume flow
measurement. It is not required for volume flow, mass flow, or velocity flow. The Base
Process Density is used with the Process Density to calculate the Density Ratio. In
temperature compensated fluids, the Process Density is calculated by the transmitter. In
non-temperature compensated fluids the Fixed Process Density is used to calculate a fixed
Density Ratio. Density Ratio is used to convert actual volumetric flow to standard
volumetric flow rates based on the following equation:
Density ratio = density at actual (flowing) conditions/density at standard (base) conditions
5.5

Reference K-factor

ProLink III
A factory calibration number relating the flow through the meter to the shedding
frequency measured by the electronics. Every vortex meter manufactured by Emerson is
run through a water calibration to determine this value.
Reference Manual
Device Tools → Configuration → Device Setup
Basic configuration
October 2021
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