Emerson Rosemount 8800D Series - Calculating Output Variables with Known Input Frequency

Electronics Verification
March 2016
Reference Manual
00809-0100-4772, Rev FA
155
Electronics Verification
C.2.6 Calculating output variables with known input frequency
Use the following equations with a known input frequency for verification of a flow rate.
Select the proper equation depending on whether you are verifying a flow rate or a mass
flow rate.
To verify a volume flow rate
Perform the following calculation to verify a volume flow rate for a given frequency and
K-factor (compensated).
Conditions
 Q = flow rate
 F = frequency, measured in Hz
 K = K-factor (compensated)
 C
x
= the unit conversion (see Table C-1 on page 156)
Equation
To verify a standard or normal flow rate
Perform the following calculation to verify a standard or normal flow rate for a given
frequency and K-factor (compensated).
Conditions
 Q = flow rate
 F = frequency, measured in Hz
 K = K-factor (compensated)
 C
x
= the unit conversion (see Table C-1 on page 156)
Equation
To verify a mass flow rate
Perform the following calculation to verify a mass flow rate for a given frequency and
K-factor (compensated).
Conditions
 M = flow rate
 F = frequency, measured in Hz
 K = K-factor (compensated)
 ρ = density at operating conditions
 C = the unit conversion
Q
F
KC
x
×
--------------=
QF
Density Ratio
KC
x
×
--------------------------
×=
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