Vol. Units - Flow Rate; Constants Tab - ABB Totalflow uFLO 6213 Application Manual

3.1.6 Vol. Units – Flow Rate
Vol. Units – Flow Rate unit selections effect values that are displayed under the
Current Values tab within the Flow Measurement application and on the FCU display.
The available units are selectable from the field's drop-down menu.

3.2 Constants Tab

The Constants tab (see Figure 3) enables the user to establish the constants for the
Flow Measurement application.
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Linear average is calculated as the mathmatical mean of one-
second samples over the log and day periods. Square root
average is the sum of square root of one-second samples,
squared, it is then divided by the number of samples.
•
Linear Average Sp = ( Sp1 + Sp2 + Sp3 + ... + Spn ) / n;
where each Spn is a sample or reading of static
pressure, and n is the number of samples or readings
over the period.
•
Linear Average Dp = ( Dp1 + Dp2 + Dp3 + ... + Dpn ) / n;
where each Dpn is a sample or reading of differential
pressure, and n is the number of samples or readings
over the period.
•
Square root Average Sp = ((SqrSp1 + SqrSp2 + SqrSp3
+ ... + SqrSpn )/n) **2; where SqrSpn is the square root
of a sample or one reading of static pressure, n is the
number of samples or readings and **2 indicates raised
nd
to the 2 power or squared.
•
Square root Average Dp = (( SqrDp1 + SqrDp2 + SqrDp3
+ ... + SqrDpn)/n) **2; where SqrDpn is the square root
of a sample or one reading of differential pressure, n is
the number of samples or readings and **2 indicates
nd
raised to the 2
As displayed in the Current Values tab, today's volume,
yesterday's volume and last calculated volume is scaled to units
selected in the Vol. Unit half of the selection. Flow rate is scaled
to the units shown on the Flow Rate side of the selection. For
example, Mgal – gal/hr scales today's volume, yesterday's
volume and last calculated volume to Mgal or thousands of US
gallons, the flow rate to gal/hr or US gallons per hour. Unit string
shown beside each value matches the selection string.
Display selections are described under the heading, Display.
power or squared.
2103956 Rev. AA