Appendix C
A-77
5.1.1 PRELIMINARY STEPS FOR ZERO SET CALIBRATIONS
Before performing a 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. (Completing the Quick Setup procedure
[Section 3.5] should accomplish this. The instrument must have successfully completed
its internal configuration process as indicated on the display by the presence of a flow
reading.)
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 in Menu 34 to zero.)
5.1.2 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 preliminary steps outlined in Section 5.1.1.
2. Ensure that there is no flow in the pipe.
3. Access Menu 51.
The following is displayed:
Set Zero
!
!!
!
No Flow
!
!!
!
Manual
4. Select
NO FLOW
.
The following is momentarily displayed, indicating that the flowmeter is now
calibrated with the zero flow set method:
Zero Cal Ok
Flow = 0.00 GPM
5.1.3 MANUAL ZERO SET
The zero point can be manually entered with the manual zero set method. This method
should be used infrequently. Manual zero set applies a constant offset entered by the user
to all readings.
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