Siemens SITRANS FUS1020, Manual, Page: 167 / 251

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1020NFM-1D
Section 6
Press <Down Arrow> to move to the [Indicated Rate] field, then press the <Right Arrow>to
enable numeric entry.
Use PC numeric keys or KeyPad to enter a flow rate for point #1, then press <ENTER>. The
highlight moves to the [% Correction] field for point #1.
Press the <Right Arrow> to enable numeric entry.
Use PC numeric keys or KeyPad to enter the required % correction for point #1.
Press the <ENTER>. The highlight returns to the [Point #] field.
To enable numeric entry press <Right Arrow> and then enter [2] (for the second calibration
point).The cursor moves to the point #2, which is the [Indicated Rate] field.
Use PC numeric keys or KeyPad to enter a flow rate for point #2. The value entered here must
be of a greater magnitude than the value entered for point #1.
Press <ENTER>. The cursor moves to the [% Correction] field.
Like the Kc slope correction described previously, you locate critical flow rate points by comparing flow
total data taken simultaneously from the 1020 and a reference meter whose accuracy meets the
required standard. Again, it is important to note that you must allow both meters to accumulate flow
total data for long enough to average out any differences due to flow fluctuation between the meter
locations.
Compare the two flow total readings to identify up to ten separate points (termed raw flow rates) where
there are significant deviations between 1020 and the reference meter. Calculate correction factors
(either negative or positive percentages) for up to ten points along the flow range. For example, enter-
ing [-0.1] for point 1 produces a negative 0.1% change in the meter output whenever the system
measures the raw flow rate specified for point 1, etc. The valid range for each percent correction is
from -50% to +50%. If you enter a value outside of this range, the flow computer will set the calibration
factor to the nearest limit.
Use these to match 1020’s output with the reference meter’s response curve. Selected calibration
points must increase in magnitude from point 1 to point 10 (or the last point that you wish to calibrate).
NOTE: You must enter the raw flow rates in ascending order.
To perform a MultiPoint Calibration:
To access the [Calibrate Flowrate] option list press the <Right Arrow>.
Move the cursor up to [MultiPoint], then press <ENTER>.
This selects the MultiPoint calibration screen, which shows:
Point # (point 1 selected)
Indicated Rate (shows current rate for point # 1)
% Correction (amount of correction applied either (-) or (+) percentage)