Yokogawa 415 Steam and Gas - Manual (Page 38)

Example
A flowmeter has been tested and the following relationship between
the input and the flowrate has been determined at the nominal
temperature & pressure as follows:
Input Flowrate Normalised Inputs for
table
Inches
wg
D.P. Output
mA
lbs/hr Input (A) Output (A
C
)
52.2007 20.000 7075.89 1.0000 1.0000
39.3894 5306.92 0.7546 0.7500
33.3231 4422.43 0.6384 0.6250
26.7444 3537.94 0.5123 0.5000
20.1656 2653.45 0.3863 0.3750
12.9913 1768.97 0.2489 0.2500
5.5400 884.48 0.1061 0.1250
1.0388 269.06 0.0199 0.0380
0.0000 4.0000 0 0.0000 0.0000
where A =
Inches wg
Inches wg at 20mA
=
Inches wg
52.2007
A
C
=
flowrate
flowrate at 20mA
=
flowrate
7075.85
The values of A and A
C
are input into the table during Calibration
and the span would be programmed as 7075.89 such that
Q = 7075.89 x A
C
36 Operation