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Appendix A
A.4 Flowrate Calibration and Calibration Tables
FUH1010 IP65 NEMA 4X Precision Volume
188
Operating Instructions, 01/2013, A5E32122003-AA
To enter the Kc Factor
1. To enable numeric entry press <Right Arrow>.
2. Use the numeric keys to type the required Kc (as calculated above). Note that the Kc
value can be negative or positive. Enter the - or + sign first, then type in the calibrated
value.
3. To store the data press <ENTER>. Note that Kc now appears in the right-hand column of
the [Calibrate Flow Rate] menu cell with its new value. Also note that this Kc value can be
viewed on the site printout.
Calibration Tables 1 through 3
SITRANS F 1010 instruments offer a unique methodology by which a particular flow
response of an instrument may be linearized or optimized by tabulating the results of a
series of calibration exercises or collected batch data points. Basically, the flow meter allows
the user to select any of a wide variety of system variables (flow rate, pressure, viscosity,
etc.) as a pointer into a table of calibration factors (up to 32). As the system variable is
updated, the value of the table’s output factors (or positive and negative flow) is re-evaluated
and used as a modifier for the current rate register. Note that the flow register is still zeroed
and Reynolds number compensated normally and these slope corrections are in addition to
these fundamentals.
Note
Kc is still active when this method is being used.
To install a Calibration table:
1. The user selects a system variable that appears to correlate strongly with calibration
shifts observed.
2. A table of values is formed comprised of the values that this index could assume over the
range of system operation. Remember, the tables created do not extrapolate beyond their
end points, they "clip."
3. A calibration factor, a number usually close to 1.00, is entered as a positive and a
negative flow rate correction factor (termed PosFlow Corr and NegFlow Corr) for each of
the desired index points.