Honeywell SmartLine Multivariable SMV800 Series User Manual page 39

You can use these formulas to manually calculate the percent of flow for comparison purposes.
Example: If you have an application with a differential pressure range of
0 to 100 inches of water with an input of 49 inches of water, substituting into the above formulas
yields:
Square Root Dropout
To avoid unstable output at PV1 readings near zero, the SMV800 transmitter automatically drops
square root conformity and changes to linear conformity for low differential pressure readings. As
shown in
Figure 11, the square root dropout point is between 0.4 and 0.5 % of differential pressure input.
Revision 6.0
• 100 = %P
Where, ÄP = Differential pressure input in engineering units
Span = Transmitter's measurement span (URV – LRV)
%P = Pressure input in percent of span
Therefore,
And, you can use this formula to determine the corresponding current
output in milliamperes direct current.
(% Flow • 16) + 4 = mA dc Output
SMV800 Series HART/DE Option User's Manual
• 100 = % Flow
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