Polatrak Deep C Meter 300 AD, Operation Manual, Page: 11 / 16

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© 2015 Deepwater Corrosion Services Inc. Specifications subject to change without notice
Deep C Meter 300 AD™ operation manual
11
SMB-001 Deep C Meter 300 AD Manual
11. Maintenance and repair
This section covers general operational maintenance; attempting any tasks not described in this sec-
tion may result in damage to the system.
11.1 Tip replacement
11.1.1 From time to time, it will be necessary to replace the contact tip. Remove the old tip with
a 7/16” or 10mm wrench. Ensure that the new tip is tight, but do not over-tighten. (Max torque 50
in-lbs)
11.2 Electrode element replacement
11.2.1 Remove the probe from the ROV and un-mate the connector. Install the dummy plug pro-
vided onto the exposed flying lead connector.
11.2.2 Fill a clean, non-metallic bucket or container with seawater filled approximately 16 –18
inches deep. Ensure that the bucket has been completely degreased and rinsed.
11.2.3 Put the probe into the bucket and stab or attach the zinc to the contact tip.
11.2.4 The contact probe connector is a SEA CON® RMG-3FS and is wired as shown below.
Figure 6: SEA CON® RMG-3FS female socket connector pin diagram
11.2.5 Using a digital voltmeter set on 2.00 VDC range, stab the large pin socket (pin 1) with the
positive voltmeter lead and stab pin socket 2 (first clockwise of large pin) with the negative lead
(note reading). Then repeat stabbing pin socket 3 with the negative lead and note the reading. The
faulty electrode will be the one that gives the lowest (least negative) reading.
11.2.6 Ensure that the probe is drained of seawater.
11.2.7 Take probe unit to a clean area. Do not handle the small electrode pellets with bare hands.
11.2.8 Remove the two screws that secure the tail unit and gently pull out the tail unit to expose
the electrode elements. Try to avoid un-mating the tip connector.
11.2.9 Visually inspect to ensure that the wire is not damaged and the connector is properly mated.
11.2.10 Remove the bad electrode and discard.
11.2.11 Take the new electrode and carefully place a small amount of silicone grease on the pin
and sealing section of the connector. Plug the new electrode into the connector.
11.2.12 Check that all connectors are fully mated and carefully put the electrodes back into the
housing and re-attach the tail unit and nose cone.
11.2.13 Repeat the calibration check as described above. Allow the probe to soak. (Note: A new
dry element may take up to 30 minutes to reach equilibrium)
CAUTION:
Never immerse the connector pin of an electrode element in water.
Pin socket 1: Contact tip
Pin socket 2: Reference electrode #1 (R1)
Pin socket 3: Reference electrode #2 (R2)