When you send the command, the flowmeter analyzes the current flow rate for up to sixty
seconds, integrating (averaging) the data for the best zero correlation. During this time, the
menu prompt at
the top of the display screen shows a timer that counts from zero to sixty. You
can allow zero averaging for the entire period, or cancel the process at any time by pressing
the <ENT> key. This controls the amount of data the flowmeter averages to obtain a zero level.
Using Reversamatic
If site conditions do not permit stopping the flow rate at the mounting location, and you do not
know the current flow rate, then you can use the ReversaMatic routine to establish the zero
flow level. You should perform the ReversaMatic procedure as quickly as possible to ensure
that the flow rate remains constant throughout the procedure.
To invoke ReversaMatic:
1. To access the [Zero Flow Adjust] option list press <Right Arrow>.
2. Move the cursor to [ReversaMatic]. Press <ENT> to invoke the routine.
3. The flowmeter 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: Reversamatic Action
4. Upon completion, the flowmeter beeps and the display screen shows: Reverse Xdcrs /
Press <ENT>
5. 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).
6. The flowmeter measures the negative flow rate briefly, then beeps and repeats the prompt:
7. 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 obtainable using the Actual Zero method, providing flow remained constant during this
procedure.
CAUTION
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
flowmeter 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.
Connecting
5.3 Zero Flow Adjust Menu
FUP1010 IP67 Portable Flowmeter
62
Operating Instructions, 02/2010, A5E02951522A Revision 01
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