Zeromatic (Optional Function) - Siemens SITRANS F Operating Instructions Manual

Section 2
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:
Upon completion, the meter beeps and the display screen shows
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 trans-
ducers, couple them to the pipe properly. Press <ENT> (after re-installing the transducers).
The flow computer measures the negative flow rate briefly, then beeps and repeats the prompt:
Now remount the transducers for normal operation (in their original orientation). When remounting
transducers, couple them to the pipe properly. Press <ENT> (after re-installing the transducers).
This completes the ReversaMatic procedure. The system's zero accuracy will be very close to that ob-
tainable 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)

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
To access the [Zero Flow Adjust] option list press
NOTE: If ZeroMatic is not running, the [Actual Zero] menu item will be displayed next to the
[Zero Flow Adjust] menu cell.
Reversamatic Action
Reverse Xdcrs / Press ENT
REYNOLDS TABLE
to scroll to the [Zero Flow Adjust] menu cell.
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1010PFM-3G
Reverse Xdcrs / Press ENT