Reference Manual
00809-0100-4004, Rev BA
August 2010
3-11
Rosemount 8800D
Base Conditions
T
b
= absolute temperature at standard (base) conditions degrees Rankine or
Kelvin. (The transmitter will convert from degrees Fahrenheit or degrees Celsius
to degrees Rankine or Kelvin respectively.)
P
b
= absolute pressure at standard (base) conditions psia or KPa absolute.
(The transmitter will convert from psi, bar, kg/sqcm, kpa, or mpa to psi or kpa for
calculation. Note that pressure values must be absolute.)
Z
b
= compressibility at standard (base) conditions (dimensionless)
Example
Configure the Rosemount 8800D to display flow in standard cubic feet per
minute (SCFM). (Fluid is hydrogen flowing at conditions of 170 °F and 100
psia.) Assume base conditions of 59 °F and 14.696 psia.)
Fixed Process Density
Process Density is required only if you have designated mass units for your
flow rate units. You will first be prompted for density units. It is required for the
conversion from volumetric units to mass units. For example, if you have set
flow units to kg/sec rather than gal/sec, a density is required to convert the
measured volumetric flow into the desired mass flow. The Fixed Process
Density must be entered even in temperature compensated Saturated Steam
applications as this value is used to determine flow sensor limits in Mass Flow
Units.
NOTE
If mass 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 is
calculated using this user-entered density, and any error in this number will
cause error in the mass flow measurement. If fluid density is changing over
time, it is recommended that volumetric flow units be used.
Reference K-Factor The reference K-factor is a factory calibration number relating the flow
through the meter to the shedding frequency measured by the electronics.
Every 8800 meter manufactured by Emerson is run through a water
calibration to determine this value.
Field Comm. 1, 3, 2, 4, 1, 2, 2
Field Comm. 1, 3, 2, 4, 2
DensityRatio
518.57 °Rx100 psiax1.0006
629.67 °Rx14.7 psiax1.0036
----------------------------------------------------------------------------- 5.586==
Field Comm. 1, 3, 3
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