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Reference Manual
00809-0100-4860, Rev BC
Appendix C: Electronics verification
January 2013
Electronics verification
Example 3 (SI units)
Therefore, an input frequency of 700.00 Hz represents a flow rate of 9259.2 NCMH in this
application.
For a given input frequency, you may also determine the current output. Use the prior example
with an input frequency of 375 Hz.
URV= 10000 NCMH LRV= 0 NCMH F
in
(Hz) = 375.00
= 11.94 mA
Therefore, an input frequency of 375.00 Hz represents a current output
of 11.94 mA.
Fluid = Natural gas URV = 10,000 NCMH
Line size = 80 mm LRV = 0 NCMH
Line pressure = 1000 KPas C
20
= C
x
/sp. units factor
(from Table C-1 on
page C-125
)
Operating
Temperature
= 10 °F Density () = 9.07754 kg/cu-mtr
(operating)
Viscosity = 0.01 cp
Input
Frequency
= 700 Hz
K-factor
(compensated)
= 10.797 (via Field
Communicator or AMS)
Q = F(Hz) /(K x C
20
) where: C
20
= C
11
/10.48 (Density Ratio)
= 700/{10.797 x (.0733811/10.48)}
= 9259.2 NCMH
I
FHzKC
20
LRV–
URV LRV–
----------------------------------------------------------------
16
4+=
I
375 10.797 0.00700200–
10000 0–
--------------------------------------------------------------------------------------
16
4+=