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Reference Manual
00809-0100-4860, Rev BC
Appendix C: Electronics verification
January 2013
Electronics verification
K-factor (compensated) = 10.79 (via Field Communicator or AMS)
= 75.00/(10.79 ϫ 0.0166667)
= 417.1 gpm
Therefore, an input frequency of 75.00 Hz represents a flow rate of
417.1 gpm in this application.
For a given input frequency, you may also determine the current output. Use the above example
with an input frequency of 75.00 Hz:
URV= 500 gpm LRV= 0 gpm F
in
= 75.00 Hz
= 17.35 mA
Therefore, an input frequency of 75.00 Hz represents a current output of 17.35 mA.
Example 2 (English units)
Therefore, an input frequency of 400 Hz represents a flow rate
of 19433.6 lb/hr in this application.
Fluid = Saturated Steam URV = 40000 lb/hr
Line size = 3 in. LRV = 0 lb/hr
Line pressure = 500 psia C
17
= C
13
/ (Table C-1
on page C-125
)
Operating
Temperature
= 467 °F Density () = 1.078 lb/cu-ft
Viscosity = 0.017 cp Vortex
Frequency
= 400 Hz
K-factor
(compensated)
= 10.678 (via Field
Communicator or AMS)
M = F(Hz) /(K x C
17
)
= 400/ {10.678 x (C
13
/)}
= 400/{10.678 x (0.00207792/1.078)}
= 400/(10.678 x 0.0019276)
= 19433.6 lb/hr
QFHzKC
2
=
I
FHzK
C
2
LRV–
URV LRV–
--------------------------------------------------------------
16
4+=
I
75.00 10.79 0.0166667 0–
500 0–
-----------------------------------------------------------------------------------
16
4+=