Siemens SITRANS FUH1010PVX, Руководство по эксплуатации, Страница: 95 / 226

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1010BXFM-3
Section 2
Measured Vs m/s
>1470
During the Initial Makeup, the flow computer verifies your site data, records the sonic char-
acteristics of the pipe and then adjusts internal parameters to optimize flow measurement.
Please remain patient. This process can take several seconds or several minutes to complete.
There is no relationship between the length of an Initial Makeup and the meter’s subsequent
performance. An Initial Makeup for larger pipes (and more demanding application condi-
tions) simply takes a little longer. Upon successful completion of the initial makeup, the 1010BX
will show the measured Vs on the prompt line.
This means that the meter was able to complete the Initial Makeup and is now actively mea-
suring flow. This prompt allows you to “fine-tune” the Measured Vs by pressing the <Right
Arrow> to activate numeric entry. You can then use the numeric keys or Magnetic Wand to
type a different value. However, only edit the Measured Vs when you are certain of your
liquids actual sonic velocity. If, however, there is a large discrepancy between the “measured”
Vs and the “actual” Vs, then consider that an accurate Vs measurement depends upon certain
parameters that the flow computer cannot sense directly (e.g., pipe dimensions or transducer
placement). In other words, entering incorrect pipe parameters or not using the recommended
spacing could result in an erroneous Vs measurement.
The meter is now ready to report flow. Press <MENU> key to display flow.
In cases where the actual Vs differs noticeably from the estimated Vs, the computer may issue
a re-space command. This requires that you re-space the Number Index transducer at the new
Number Index, then press <ENT> again. Repeat the initial makeup process. You can override
a re-space command by simply pressing the [Down Arrow]. However, after the meter com-
pletes operating, you must confirm that the sonic velocity (Vs) of the liquid falls between the
[Vs max] and [Vs min] items in [Diagnostic Data/Site Setup Data].
Therefore, only consider editing the measured Vs after you remove all the primary causes for
an inaccuracy. Check your pipe dimensions and pipe material entries. Re-check the trans-
ducer spacing and part numbers. Large Vs discrepancies are almost always due to erroneous
pipe data or incorrect transducer placement.
To accept the Measured Vs:
Pressing or moves the cursor to the [Empty Pipe Set] menu cell.
If you decide to edit the Measured Vs:
To activate numeric entry press
Use PC numeric keys or Magnetic Wand to enter the new Vs value (in m/s).
To store the corrected Vs press
The computer may recommend a new Number Index and prompt you to press
Remount the transducer at the new Number Index.
To repeat the Initial Makeup process press
ENT
ENT
ENT
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