Filter
Top Products
Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
™
Fieldbus
4-12
This value must be entered if using Standard or Normal units (SCFM,
SCFH, NCMM, NCMH, NCMD). These units are configured in the AI
block. The density ratio can also be calculated by entering the process
and base conditions as described below (The Model 8800C electronics
will then calculate the density ratio for you.)
Process Conditions Used to calculate the density ratio. Refer to the equation listed under
Density Ratio.
Process Temperature
Process Temperature is the absolute temperature T
f
at actual
(flowing) conditions in degrees Rankine or Kelvin. The Model 8800C
electronics will convert from degrees Fahrenheit or degrees Celsius to
degrees Rankine or Kelvin respectively.
Process Pressure
Process Pressure is the absolute pressure P
f
at actual (flowing)
conditions in psia or KPa absolute. The Model 8800C will convert from
the pressures in absolute for the calculation.
Process Compressibility
Process Compressibility is the compressibility Z
f
at actual (flowing)
conditions (dimensionless).
Base Conditions Base Conditions is used to calculate the density ratio. Refer to the
equation listed under Density Ratio.
Base Temperature
Base Temperature is the absolute temperature T
b
at standard (base)
conditions in degrees Rankine or Kelvin. The Model 8800C electronics
will convert from degrees Fahrenheit or degrees Celsius to degrees
Rankine or Kelvin respectively.
Base Pressure
Base Pressure is the absolute pressure P
b
at standard (base)
conditions in psia or KPa absolute. The Model 8800C will convert from
the pressures in absolute for the calculation.
Base Compressibility
Base Compressibility is the compressibility Z
b
at standard (base)
conditions (dimensionless).
Sensor
Pipe I.D. The Pipe I.D. (inside diameter) of the pipe adjacent to the flowmeter
(mating pipe) can cause entrance effects that may alter flowmeter
readings. Specify the exact inside diameter of the pipe to correct for
these effects. Enter the appropriate value for this variable.
Conversion factor
density at actual (flowing) conditions
density at s dard (base)tan conditions
------------------------------------------------------------------------------------------------------------=
Conversion factor
T
b
P
f
× Z
b
×
T
f
P
b
× Z
f
×
-------------------------------=