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Reference Manual
00809-0100-4860, Rev BC
Appendix C: Electronics verification
January 2013
Electronics verification
Figure C-2. Test Frequency Output and Chassis Ground Points.
C.2.5 Calculating output variables with known
input frequency
Use the following equations with a known input frequency for verification of a flow rate or 4–20 mA
output within a given calibrated range. Select the proper equation depending on if you are verifying
a flow rate, mass flow rate, 4–20 mA output, or special units. Example calculations starting on
page 125 may clarify how these equations are used.
To verify a flow rate
For a given frequency F (Hz), and K-factor (compensated), find the
flow rate Q:
where C
x
is the unit conversion (Table C-1 on page C-125).
To verify a standard or normal flow rate
To verify a mass flow rate
For a given mass frequency F (Hz), and K-factor (compensated), find the mass flow rate M:
where C is the unit conversion and
is density at operating conditions:
where C
x
is the unit conversion using density () (Table C-1 on page C-125).
Ground
Test Frequency In
Test Point 1
QFHzKC
x
=
QFHz DensityRatio KC
x
=
M
F
K C
-------------------------=
MFHzKC
x
=