Si Units; C.3.2 Si Units - Emerson Rosemount 8800D Series Reference Manual

Electronics Verification
March 2016
C.3.2

SI units

Example 1
In this application, an input frequency of 80 Hz represents a flow rate of 1,686.8 lpm.
Given
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
Other conditions
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
Equation
Calculations
Example 2
In this application, an input frequency of 650 Hz represents a flow rate of 3,446.4 kg/hr.
Given
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Q = flow rate
F = frequency: 80 Hz
K = K-factor (compensated): 10.772 (via fieldbus configuration tool)
C = C
x 8
C = 4.40287E-03 (from
–
8
Fluid = water
Line size = 80 mm
Line pressure = 700 kPag
Operating temperature = 60 °C
Q =
------------------------- -
=
Q
10.772
-------------------------------------------
Q =
×
10.772
=
Q
M = mass flow rate
F = frequency: 650.00 Hz
K = K-factor (compensated): 10.715 (via fieldbus configuration tool)
C = C
x 16
C = C /ρ (from
–
16 11
ρ = density: 4.169 lb/m
3
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Table C-1 on page
F
-------------- -
×
K C x
80
×
C 8
80
0.00440287
1,686.8 lpm
Table C-1 on page 156)
(operating)
Industry Automation
Reference Manual
00809-0100-4772, Rev FA
156)
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159