Siemens FUS1010 User Manual download pdf (Page 89)

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1010NFM-3J

Section 2

Press to move to the [Indicated Rate] field, then to enable numeric entry.

Use the numeric keys to type a flow rate for point #1, then . The highlight moves

to the [% Correction] field for point #1. Press to enable numeric entry.

Use the numeric keys to type the required % correction for point #1.

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

To enable numeric entry press then 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 . The cursor moves to the [% Correction] field.

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

This selects the MultiPoint calibration screen, which shows:

ENT

Point # (point 1 selected)

Indicated Rate (shows current rate for point # 1)

% Correction (amount of correction applied either (-) or (+) percentage)

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Siemens FUS1010 User Manual Page 89