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Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
TM
Fieldbus
9-4
Calculating Output
Variables with Known Input
Frequency
Use the following equations with a known input frequency for
verification of a flow rate within a given calibrated range. Select the
proper equation depending on whether you are verifying a flow rate or a
mass flow rate. Example calculations starting on page 9-7 may clarify
how these equations are used.
To Verify a Flow Rate
Perform the following calculation to verify a 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 9-1 on page 9-6)
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 9-1 on page 9-6)
Equation:
Q
F
KC
x
×
--------------=
QF
Density Ratio
KC
x
×
--------------------------
×=