2-28
1010PVNFM-3A
Section 2
verifies your site data, records the sonic characteristics of the pipe and liquid and then ad-
justs 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 conditions) simply takes a little longer. Upon
successful completion of the initial makeup, the 1010 will show you a pop-up window with the
measured Vs as shown in the example below.
This means that the flow computer 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 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 on certain parameters that the flow computer cannot sense directly (e.g., pipe di-
mensions 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 the <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 keying the <Down Arrow>. However, after
the meter completes begins 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 the numeric keys to type the new Vs value (in meters-per-second).
To store the corrected Vs press
The flow 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
Measured Vs m/s
1470
ENT
ENT
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