Specifications

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2013 Deepwater Corrosion Services Inc. Specications subject to change without notice
ROV-II operation manual
10 Document 354-MN01-ENG Rev. C
9. Maintenance and repair
This section covers general operational maintenance. Do not attempt any task not described in this
section, as it may damage the system.
9.1 Tip replacement
From time to time it will be necessary to replace tips. Remove the old tip with a 7/16 in. wrench (ats
are best). Avoid using an adjustable wrench if possible. Ensure that the new tip is tight.
CAUTION: The contact tip has been machined to a very sharp point to enable easier read-
ings through coatings. This point can also easily cut or poke through human skin. Please
handle with care.
9.2 Reference electrode element replacement
Spare plug-in electrode elements are available for the ROV-II probe. These elements will also work in
the Polatrak CP Gun. If one element or more needs to be changed, follow this procedure:
9.2.1 Remove the probe from the ROV and un-mate the connector. Install the provided
dummy plug onto the exposed ying lead connector.
9.2.2 Perform a zinc coupon bucket calibration as described in section 5.3.4. The faulty elec-
trode will be the one that gives the more positive reading.
9.2.3 Ensure that the probe is drained of seawater.
9.2.4 Take the probe unit to a clean area.
9.2.5 DO NOT handle the small electrode pellet with bare hands.
9.2.6 Remove the two screws securing the tail unit and gently pull out the tail unit to expose
the electrode elements. Try to avoid un-mating the tip connector.
9.2.7 Visually inspect to ensure that the wire is not damaged and the connector is properly
mated.
9.2.8 Remove the bad electrode and discard according to appropriate local environmental
procedures.
9.2.9 Take the new electrode and carefully place a small amount of insulating compound on
the sealing section of the electrode connector. Please refer to the MSDS in appendix before
handling sealant. All appropriate Personal Protective Equipment (PPE) shall be worn, including
safety glasses, as a minimum.
9.2.10 Plug in the new electrode.
9.2.11 Check that all connectors are fully mated, then carefully put the electrodes back into the
housing and re-attach the tail unit and nose cone.
9.2.12 Repeat calibration as described above. (Note that a new dry element may take up to 30
minutes to reach equilibrium)
Caution: NEVER immerse an electrode element in water with the connector pin ex-
posed.