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Preliminary Steps
Before performing a zero set (zero flow set or manual zero set) calibration, follow these
preliminary steps:
1. Ensure that the transducers are connected to the pipe during the zero set calibration
procedure.
2. Ensure that the instrument is reading flow. The instrument must have successfully
completed its internal configuration process as indicated by the presence of a flow
reading on the Graph screen (Section F.5).
3. Disable the low flow cutoff to allow the zeroing operation to be verified. (To disable
the low flow cutoff, set the low flow cutoff value to zero.)
Zero Flow Set Method
The best method of zeroing the instrument is to stop the flow and perform a zero flow set.
on the pipe. The purpose of the zero flow set is to zero the instrument for the individual
installation. This method is used only when the flow in the pipe can be stopped.
To zero the instrument with the zero flow set method:
1. Follow the procedures outlined in Preliminary Steps, above.
2. Ensure that there is no flow in the pipe.
3. From the
CALIBRATION
options group, click on the
ZERO FLOW
command button
(Figure F.15).
Figure F-15 Zero Flow Button
If the flow rate is higher than recommended for performing a zero flow set calibration,
an error message is displayed. For example (Figure F-16):
Figure F-16 Zero Flow Set Error Message (example)
4. If the error message is displayed, the following is recommended:
!
Cancel the zero flow calibration by clicking on the
NO
button.
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