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2.4.6 THE NUMBER INDEX MENU CELL
Selecting the Spacing Offset allows the flow computer to calculate the Number Index. The Number Index establishes the spacing between a pair of transducers. You cannot override this recommenda- tion. To complete the transducer installation, you must accept the Number Index by mounting the transducer at that point on your spacer bar or mounting track. Initially, the flow computer bases its Number Index selection on the pipe diameter and estimated liquid sonic velocity (Vs) you entered in the Application Data menu. When you invoke the [Install Completed?] routine, the flow computer actually measures the liquid sonic velocity (Vs). In some cases, it may prompt you to
2.4.7 THE Ltn MENU CELL
This view only menu cell shows the distance in inches or millimeters between the front faces of the transducers along the axis of the pipe. If you are mounting the transducers without a track or spacer bar, you have to space them according to this value (see Section 3 for details). Note that Ltn may be a negative number for direct mount on very small pipes where the transducer spacing overlaps.
2.4.8 HOW TO USE [INSTALL COMPLETED?]
Use the [Install Completed?] menu cell to inform the flow computer that you have mounted the trans- ducers according to the selected mode and spacing requirements and are ready to start operation.
To start the [Install Completed?] routine for an original installation:
Select any
Press <Down Arrow> and scroll to the [Pick/Install Xdcr] menu cell. Press <Right Arrow>.
Install transducers as required (refer to Section 3 for procedures).
NOTES
zMount the transducers using the selected mode (direct or reflect). Please refer to the trans- ducer mounting procedures detailed in Section 3.
zWhen using a mounting track or a spacer bar in reflect mode, locate the first trans- ducer at the Reference Index and the second transducer at the recommended Number Index.
zIf you are mounting the transducers independently, you must use the recommended distance; Ltn to space the transducers.
zYou must use the proper sonic coupling compound. See “Recommended Sonic Coupling Compounds” in Section 5 for appropriate type and part number.
zThe pipe must be completely filled with a liquid, which can be either flowing or at zero flow.
