Reference Manual
00809-0100-4793, Rev CA
August 2004
Rosemount 8742C
3-4
FLOWTUBE MOUNTING
Physical mounting of a flowtube is similar to installing a typical section of pipe.
Conventional tools, equipment, and accessories (bolts, gaskets, and
grounding hardware) are required.
Upstream/Downstream
Piping
To ensure specification accuracy over widely varying process conditions,
install the flowtube a minimum of five straight pipe diameters upstream and
two pipe diameters downstream from the electrode plane (see Figure 3-2).
Figure 3-2. Upstream and
Downstream
Straight Pipe Diameters
Flowtube Orientation
The flowtube should be installed in a position that ensures the flowtube
remains full during operation. Figures 3-3, 3-4, and 3-5 show the proper
flowtube orientation for the most common installations. The following
orientations ensure that the electrodes are in the optimum plane to minimize
the effects of entrapped gas.
Vertical installation allows upward process fluid flow and is generally
preferred. Upward flow keeps the cross-sectional area full, regardless
of flow rate. Orientation of the electrode plane is unimportant in vertical
installations. As illustrated in Figures 3-3 and 3-4, avoid
downward
flows
where back pressure does not ensure that the flowtube remains full at all
times.
Figure 3-3. Vertical Flowtube
Orientation
FLOW
5 Pipe Diameters
2 Pipe Diameters
8732-0281G
02A
FLOW
FLOW
A
B
8735-0005A01AB, 0005A01BB
Summary of Contents for 8700 Series
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