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6-28
1020NFM-1D
Section 6
This completes the ReversaMatic procedure. The system’s zero accuracy will be very close to that
obtainable using the Actual Zero method, providing flow remained constant during this procedure.
Important Note: A caution on the use of upper and lower flow limits (used to prevent flow mis-registra-
tion) prior to using the Reversal Zero technique (ReversaMatic): If the negative flow rate that the meter
reads in the step during which the transducers are reversed is more negative than the lower flow limit,
the meter will re-register positive and the Reversal Zero cycle will thus be corrupted.
Therefore, postpone the installation of upper and lower flow limits until the reversal zero procedure is
executed successfully. For pipes that combine large diameters with very high flow velocities, it may be
necessary to move the upper and lower flow limits out of the way until the reversal zero is completed.
Moreover, pipes of this size frequently have excellent intrinsic zero performance and may not even
need zeroing.
ZeroMatic (optional function)
REYNOLDS TABLE
NOTE: ZeroMatic is used in the Reflect Mode only. Invoking ZeroMatic clears any existing
fixed zero offset.
Use this menu cell to select the ZeroMatic option. If conditions permit the use of the Auto Zero function
then the ZeroMatic option can be used as well.
To select and enable the ZeroMatic option:
In the Pick/Install Xdcr menu, press the <Down Arrow> to scroll to the [Zero Flow Adjust] menu
cell.
To access the [Zero Flow Adjust] option list press <ENTER>.
NOTE: If ZeroMatic is not running, the [Actual Zero] menu item will be displayed next to the
[Zero Flow Adjust] menu cell.
Siemens Dual Path
SITE1
Transducer Model
1011 Universal
Transducer Size
B3
Xdcr Mount Mode
Reflect
Spacing Offset
Minimum
Flow
Number Index
7
Spacing Method
Track 1012TP
Ltn Value (in)
ReversaMatic
Install Complete?
ZeroMatic
Empty Pipe Set
Auto Zero
Zero Flow Adjust
Actual Zero
ZeroClr
Conformans Indicated flow to Actual Zero
Pick/Install Xdcr
Select the [ZeroMatic] menu cell by pressing the <Up/Down Arrows> then press <ENTER>.
Содержание SITRANS FUS1020
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Страница 221: ...21614 C ...
Страница 222: ...21614 C ...
Страница 223: ...990TNHM 8 OUTLINE DIMENSIONS TRANSDUCERS TRACKS DEDICATED HYBRID MODE 21614 C ...
Страница 224: ...1011FTP 8 21614 C ...
Страница 225: ...1011FTNF 8 21614 C ...
Страница 226: ...21614 C PFA DFT FLOWTUBE INSTALLATION OUTLINE 992DFTP T 8 ...
Страница 227: ...INSTALLATION OUTLINE 992 SERIES EXTENDED FLOWTUBE 21614 C 992DFTN 8 ...
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