Siemens SITRANS FUS1010 NEMA-4X/ IP 65 manual NFM-3J

Section 2 1010NFM-3J

Like the Kc slope correction described in the previous section, you locate critical flow rate points by comparing flow total data taken simultaneously from the 1010N and a reference meter whose accu- racy 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 be- tween 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 System 1010N and the reference meter. Calculate correction factors (either negative or positive percentages) for up to ten points along the flow range. For example, entering [-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 System 1010N’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 Flow Rate] option list press

Move the cursor up to [MultiPoint], then press ENT

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)

Pressto move to the [Indicated Rate] field, thento enable numeric entry. Use the numeric keys to type a flow rate for point #1, then ENT . The highlight moves

to the [% Correction] field for point #1. Pressto enable numeric entry. Use the numeric keys to type the required % correction for point #1.

Press ENT . The highlight returns to the [Point #] field.

To enable numeric entry pressthen type [2] (for the second calibration point). The cursor moves to the point #2 - [Indicated Rate] field.

Use the numeric keys to type a flow rate for point #2. The value entered here must be of a greater magnitude than the value entered for point #1.

Press ENT . The cursor moves to the [% Correction] field.

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