Si Units - Emerson Rosemount 8600D Series Reference Manual

Appendix C: Electronics verification
January 2013
C.3.2

SI units

Example 1 (SI units)
Fluid
Line size
Line pressure
Operating
Temperature
Input
Frequency
K-factor
(compensated)
M
Therefore, an input frequency of 80.00 Hz represents a flow rate of 1694.6 lpm in this
application.
For a given input frequency, you may also determine the current output. Use the above example
with an input frequency of 80.00 Hz:
URV= 2000 lpm
= 17.49 mA
Therefore, an input frequency of 80.00 Hz represents a current output
of 17.49 mA.
128
= Water
= 80 mm.
= 700 kPas
= 60 °F
= 80 Hz
= 10.772 (via Field Communicator or AMS)
= F(Hz) /(K x C )
8
= 80/(10.722 x 0.00440287)
= 1694.6 lpm
LRV= 0 lpm

      
F Hz K C –
I =
8
------------------------------------------------------------ -

URV LRV –

   
80 10.772 0.00440287

I =
------------------------------------------------------------------------------------- -

2000 0
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URV = 2000 lpm
LRV = 0 lpm
C = 4.40287E-03 (from
8
Table C-1 on
page C-125
F (Hz) = 80.00
in


LRV
  
+ 4
16

 0 
–


16
–
Reference Manual
00809-0100-4860, Rev BC
)



+ 4

Electronics verification