Rosemount 8732C, Manual

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2-23
Installation
Installation Check
and Guide Use this guide to check new installations of Rosemount Magnetic
Flowmeter Systems that appear to malfunction. For detailed
troubleshooting instructions, see Section 5: Troubleshooting.
Before You Begin
Be sure that power to your system is off before beginning these checks.
Transmitter
1. Check for correct flowtube calibration number entered in
the software. (The calibration number is listed on the
flowtube nameplate.)
2. Check for correct flowtube line size entered in the software.
(The line size value is listed on the flowtube nameplate.)
3. Check that the analog range of the transmitter matches the
analog range in the control system.
4. Check that the forced analog output of the transmitter produces
the correct output at the control system.
Flowtube
1. For horizontal flow installations, ensure that the electrodes are in
a plane such that they remain covered by process fluid.
2. For vertical or inclined installations, ensure that process fluid is
flowing up into the flowtube to keep the electrodes covered by
process fluid.
3. Ensure that the grounding straps on the flowtube are connected
to grounding rings, lining protectors, or the adjacent pipe flanges.
Improper grounding will cause erratic operation of the system.
Process Fluid
1. Process fluid conductivity should be 5
µ
mhos per
centimeter, minimum.
2. Process fluid must be free of air and gasses.
3. Flowtube should be full of process fluid.
PROCESS LEAK
PROTECTION
(MODEL 8705 ONLY)
The Model 8705 Flowtube housing is fabricated from carbon steel
to perform two separate functions in the flowtube design. First, it
provides shielding for the flowtube magnetics so that external
disturbances cannot interfere with the magnetic field and thus affect
the flow measurement.
Second, it provides the physical protection to the coils and other
internal components from contamination and physical damage that
might occur in the industrial environment. The housing is completely
welded, and the joints contain no gaskets; the totally leak-free
enclosure protects the internal components, even in the most
demanding installations.