4-27
1010GCNFM-3C
Section 4
Measured Vs m/s
1470
3. To exit Force Transmit, press the <Left Arrow> and a Detection Fault prompt will appear (see above).
Press the <Left Arrow> again and the flowmeter will return to the Pick/Install Xdcr menu and highlight
the [Zero Flow Adjust] menu cell.
4. To force a frequency, repeat steps 1 and 2 above, but press <Ctrl> and <MENU> simultaneously.
The following typical display line will appear:
Using numeric keys enter the frequency and press <ENT>.
5. If the Force Transmit diagnostic procedure is not used, the normal [Install Completed?] function
occurs as follows:
To complete the Install process after mounting the transducers press <ENT>.
Immediately after you press <ENT>, the flowmeter starts an internal process called an Initial Makeup.
The current Initial Makeup activity, for example:
Drive 14 m 10 [—] appears at the top of Display Screen.
During the Initial Makeup, the flowmeter verifies your site data, records the sonic characteristics of the
pipe and gas and then adjusts internal parameters to optimize flow measurement. Please remain pa-
tient. 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 conditions) simply takes a little longer. Upon sucessful
completion of the initial makeup, the FUG1010GCN will show you a pop-up window with the measured
Vs as shown below.
This means that the flowmeter was able to complete the Initial Makeup and is now actively measuring
flow. This pop-up window allows you to “fine-tune” the Measured Vs by pressing the <Right Arrow> to
activate numeric entry. You can then use the numeric keys to type a different value. However, only edit
the Measured Vs when you are certain of 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 de-
pends on certain parameters that the flowmeter cannot sense directly (e.g., pipe dimensions or trans-
ducer placement). In other words, entering incorrect pipe parameters or not using the recommended
spacing could result in an erroneous Vs measurement.
The flowmeter is now ready to report flow. Press the <MENU> key to display flow.
In cases where the actual Vs differs noticeably from the estimated Vs, the flowmeter 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 com-
mand by simply keying the [Down Arrow]. However, after the flowmeter completes operating, you must
confirm that the sonic velocity (Vs) of the liquid falls between the [Vs max] and [Vs min] items in [Diag-
nostic Data / Site Setup Data].
Therefore, only consider editing the measured Vs after you remove all the primary causes for an inaccu-
racy. Check your pipe dimensions and pipe material entries. Re-check the transducer spacing and part
numbers. Large Vs discrepancies are almost always due to erroneous pipe data or incorrect transducer
placement.
Drive
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