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2-32
1010PVNFM-3A
Section 2
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The meter begins to measure the positive flow rate. “Positive” flow refers to flow moving
from upstream transducer location to the downstream transducer location. Note top prompt
line shows:
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Upon completion, the meter beeps and the display screen shows:
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Now remove then remount the upstream and downstream transducers in their reversed
positions. Mount the Up transducer (without removing its cable) in the Down transducer/
cable location. Mount Down transducer with its cable in the Up transducer/cable location.
When remounting the transducers, couple them to the pipe properly. Press <ENT> (after
re-installing the transducers).
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The flow computer measures the negative flow rate briefly, then beeps and repeats the
prompt:
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Now remount the transducers for normal operation (in their original orientation). When
remounting transducers, couple them to the pipe properly. Press <ENT> (after re-install-
ing the transducers).
This completes the ReversaMatic
TM
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-
registration) 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 proce-
dure is executed successfully. For pipes that combine large diameters with very high flow veloci-
ties, 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 perfor-
mance and may not even need zeroing.
Reverse Xdcrs / Press ENT
Reverse Xdcrs / Press ENT
Reversamatic Action
ZeroMatic
TM
(optional function)
REYNOLDS TABLE
NOTE: ZeroMatic
TM
is used in the Reflect Mode only. Invoking ZeroMatic
TM
clears any
existing fixed zero offset.
Use this menu cell to select the ZeroMatic
TM
option. If conditions permit the use of the Auto
Zero function then the ZeroMatic
TM
option can be used as well.
To select and enable the ZeroMatic option:
In the Pick/Install Xdcr menu, press to scroll to the [Zero Flow Adjust] menu cell.
To access the [Zero Flow Adjust] option list press
NOTE: If ZeroMatic
TM
is not running, the [Actual Zero] menu item will be displayed
next to the [Zero Flow Adjust] menu cell.
Содержание 1010PVDN
Страница 185: ...APPENDIX A Couplant Installation Instructions...