Reference Manual
00809-0100-4793, Rev CA
August 2004
6-5
Rosemount 8742C
Figure 6-1.
Flowtube Circuit Diagram
STEP 6: UNINSTALLED
FLOWTUBE TESTS
An uninstalled flowtube can also be used for flowtube troubleshooting. To
interpret the results, the hazardous location certification for the flowtube must
be known. Applicable codes for the Rosemount 8705 are N0, N5, and KD.
Applicable codes for the Rosemount 8707 are N0 and N5. Applicable codes
for the Rosemount 8711 are N0, N5, E5, and CD.
A flowtube circuit diagram is provided in Figure 6-1. Take measurements from
the terminal block and on the electrode head inside the flowtube. The
measurement electrodes, 18 and 19, are on opposite sides in the inside
diameter. If applicable, the third grounding electrode is in between the other
two electrodes. On 8711 flowtubes, electrode 18 is near the flowtube junction
box and electrode 19 is near the bottom of the flowtube (Figure 6-2). The
different flowtube models will have slightly different resistance readings.
Flanged flowtube resistance readings are in Table 6-2 while wafer flowtube
resistance readings are in Table 6-3.
8712-0007E04A
68.1k
(not applicable for
flowtubes with N0 hazardous
certification approval option
code)
Flowtube Housing
68.1k
See “Safety Information” on page 4-1 for complete warning information.
Summary of Contents for 8700 Series
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