Reference Manual
00809-0100-493, Rev CA
August 2004
Rosemount 8742C
www.rosemount.com
Appendix E
Field-Removable Electrodes
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-1
Remove the Electrode Assembly . . . . . . . . . . . . . . . . . . . page E-1
Replace the Electrode Assembly . . . . . . . . . . . . . . . . . . . page E-2
SAFETY MESSAGES
Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations.
The field-removable electrode option allows the user to remove the electrode
assembly with the flowtube still mounted in the line. Frequently, this option will
be used for cleaning the electrode head when coating is of concern.
The flowtube should be drained of any process fluid prior to disassembly of
the electrodes. To avoid personal injury, care should be taken when handling
electrodes that have been in contact with corrosive process fluids. Take care
to avoid rotating the electrode when removing it to avoid damage to the o-ring.
Some resistance may be experienced due to the tight o-ring fit.
REMOVE THE
ELECTRODE ASSEMBLY
Use the following procedure to remove the electrode assembly
from the flowtube.
1.
Drain the flowtube of any process fluid prior to disassembly
of the electrodes.
2.
Remove the screws that secure the electrode cover.
3.
Remove the electrode cover and o-ring. It is generally recommended
that new o-rings be installed on the electrode and the electrode cover
during reassembly.
4.
Remove the electrode lead screw that secures the signal wire to the
electrode.
5.
Remove the electrode retaining nut.
6.
Take the electrode from the electrode housing by pulling it straight
out, with firm pressure, along the axis of the electrode.
Failure to follow these installation guidelines could result in death or serious
injury:
Installation and servicing instructions are for use by qualified personnel only. Performing
any servicing other than that contained in this manual may
result in death or serious injury. Do not perform any servicing other than
that contained in the operating instructions.
Summary of Contents for 8700 Series
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