Calculating Output Variables With Known Input Frequency - Emerson Rosemount 8600 Series Reference Manual

Electronics Verification
May 2019
Figure C-2. Test Frequency Output and Chassis Ground Points.
Ground
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
To verify a flow rate
For a given frequency F (Hz), and K-factor (compensated), find the
flow rate Q:
where C
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
where C
108
page 110
Q =
is the unit conversion (Table C-1 on page
x
Q =
M =
M =
is the unit conversion using density (
x
may clarify how these equations are used.
F Hz     K C  x 
110).

F Hz DensityRatio
   
F
-------------------------
K   C
  
is density at operating conditions:

F Hz     KC x 
) (Table C-1 on page

Reference Manual
00809-0100-4860, Rev BF
Test Frequency In
Test Point 1

K C
    x 
110).
Rosemount 8600 Vortex Flow Meter