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Reference Manual
00809-0100-4860, Rev BC
Section 3: Configuration
January 2013
Configuration
Operating conditions
T
f
= absolute temperature at actual (flowing) conditions in degrees Rankine or Kelvin. (The
transmitter will convert from degrees Fahrenheit or degrees Celsius to degrees Rankine or Kelvin
respectively.)
P
f
= absolute pressure at actual (flowing) 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
f
= compressibility at actual (flowing) conditions (dimensionless)
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 8600D 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.
Field Comm. 1, 3, 2, 4, 1, 2, 1
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
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