Emerson Rosemount 8600 Series - Page 120

Reference Manual
00809-0100-4860, Rev BF
Electronics Verification
May 2019
112
Rosemount 8600 Vortex Flow Meter
For a given input frequency, you may also determine the current output. Use the Example 2
on page 111 with an input frequency of 300 Hz:
URV= 40000 lb/hr LRV= 0 lb/hr F
in
(Hz) = 300.00
= 9.83 mA
Therefore, an input frequency of 300.00 Hz represents a current
output of 9.83 mA.
Example 3 (English units)
Therefore, an input frequency of 700.00 Hz represents a flow rate of 5569.4 SCFM in this
application.
For a given input frequency, you may also determine the current output. Use the above
example with an input frequency of 200 Hz.
Fluid = Natural gas URV = 5833 SCFM
Line size = 3 in. LRV = 0 SCFM
Line pressure = 140 psig C
20
= C
x
/sp. units factor
(from Table C-1 on
page110)
Operating
Temperature
= 50 °F Density () = 0.549 lb/cu-ft
(oper)
Viscosity = 0.01 cp Input
Frequency
= 700 Hz
K-factor
(compensated)
= 10.678 (via Field
Communicator or AMS)
Q = F(Hz) /(K x C
20
) where: C
20
= C
12
/10.71 (Density Ratio)
= 700/{10.797 x (0.124675/10.71)}
= 5569.4 SCFM
I
F Hz  K C
17
  LRV–
URV LRV–
------------------------------------------------------
16 
 
 
4+=
I
300 10.678 0.0019276  0– 
40000 0–
--------------------------------------------------------------------------------------
16 
 
 
 
4+=