Polatrak DEEP C METER 300 User manual

CORROSION TESTING PROBE
Deepwater Corrosion Services Inc.
polatrak.com | [phone] |Email: [email protected]
©2016 Deepwater Corrosion Services Inc. Specications subject to change without notice
DEEP C METER 300™
ROV-MOUNTED CP PROBE
OPERATION MANUAL
ROV-interfaced
cathodic protection
monitoring system
Rated for
depths up to
300 meters
Lightweight,
for inspection
class ROVs

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13813 FM 529 Rd, Houston, TX 77041 | US [phone] | Email: [email protected]
©2016 Deepwater Corrosion Services Inc.
2SMB-005 Deep C Meter 300 Manual Rev. 1
DEEP-C METER™ MANUAL
Table of contents
1 Overview 3
2 Documentation 4
3 Health and safety 4
4 Voltage readout unit components 4
4.1. Pressure housing 4
4.2. Adjustable mount 5
5 Probe unit components 6
5.1. Main body 6
5.2. Nose cone 6
5.3. Main body section 6
5.4. Tail unit 7
5.5. Reference electrode element 7
5.6. ROV II probe T-handle mount 7
5.7. Flying lead 7
6 Spare parts and accessories 8
7 Calibration 8
7.1. Bucket calibration procedure 8
7.2. Underwater online calibration 9
8 Operation 9
9 Mounting on ROV 9
10 Taking CP potential readings 10
11 Data interpretation 11
12 Maintenance and repair 12
12.1. Overview 12
11.2. Tip replacement 12
11.3. Electrode element replacement 12
11.4. Battery replacement 13
12.0 Troubleshooting 15
12.1. General 15

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List of gures
Figure 1 - Voltmeter module 5
Figure 2 - Meter mount 6
Figure 3 - Exploded view of ROV II probe 7
Figure 4 - ROV-II probe 7
Figure 5 - Seacon RMG-3FS wiring diagram 12
List of tables
Table 1 - Normal cathodic protection ranges
for bare carbon steel in seawater 10
Table 2 - Troubleshooting quick guide 14
Table 3 - List of spare parts 15
1. Overview
The Deep-C-Meter 300 is a complete ROV-interfaced cathodic
protection monitoring system. The system has three basic parts:
The readout unit, which is twin voltmeters housed in a (black) Delrin®
pressure housing; The probe, a twin element, tip-contact CP probe
(Polatrak® model ROV-II™) and the ying lead, a three-meter-long
umbilical that connects the probe to the readout.
Flying lead Voltage
readout
unit
ROV-II
contact
probe
Meter
mount
ROV-II probe
T-handle mount
Figure 1:
Deep C Meter 300
kit components
Storage
case

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2. Documentation
2.1. The following documents are contained in the appendix:
2.1.1. ROV II operations manual
2.1.2. Parker Seals - Parker O Lube MSDS – O-Ring Lubricant
2.1.3. Dow Corning – 4 electrical insulating compound MSDS
connector sealant
PLEASE CONTACT YOUR DEEPWATER REPRESENTATIVE FOR
ANY QUESTIONS OR ISSUES REGARDING THIS MANUAL.
3Health and safety
It is the intention of Deepwater Corrosion that all test and inspection
procedures are carried out in a safe manner in accordance with the
Health and Safety At Work Act and any other relevant legislation. If
required by the client, Deepwater personnel will attend any site safety
induction courses before carrying out work on site.
4Voltage readout unit components
The readout unit has two major
sub-assemblies: The pressure housing
and the mount. The voltmeter module
slides into a “dovetail” joint on the mount.
4.1 Pressure housing
4.1.1. Housing body - The
pressure housing is
made from a solid piece
of Delrin®and is rated for
300 meters (1,000 feet) depth.
4.1.2. Lens - One end of the housing contains an acrylic
lens that seals with o-rings into the pressure housing. Four
stainless-steel screws keep the lens seated in the pressure
housing. Access to the inside of the pressure housing is
gained by pulling the lens. See maintenance and repair
section for details on lens removal/replacement.
Figure 2:
Deep C
Meter 300
readout
unit

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4.1.3. Bulkhead connector - The back end of the pressure housing is
sealed with a bulkhead connector. This connector threads into
the back of the pressure housing and also seals with an o-ring.
It should not be necessary to remove this connector during
normal maintenance. A blank (dummy) connector is provided
and should be in place whenever the mating
connector is removed.
4.1.4. Voltmeter module -
The voltmeter
module is located
within the pressure
housing. The
voltmeter module
contains two
independent
3 ½ -digit LED
voltmeters. Default
factory range is +/- 1999 mV DC on both readouts. A 9V
alkaline battery powers each of the readouts. On the face of
the module is a photocell that switches each measurement
circuit on when exposed to light from the ROV.
4.2. Adjustable mount
4.2.1. The adjustable
mount is designed
to secure the
readout to the
ROV frame, and
provides angled
adjustment to
optimize camera
viewing of the
displays. The
mount is made
of Delrin®and is
secured with SS bolts.
Figure 3:
Voltmeter module
showing battery placement
Figure 4:
Adjustable meter mount

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5.0 Probe unit components
5.1. Main body
5.1.1. The Deep-C-Meter 300 utilizes the popular Polatrak
ROV-II tip contact probe. This probe can be used
independently of the readout unit as a standard topside-wired
CP probe. For reference, the entire manual for this probe
is included herein or can be found separately under document
number 354-MN01-ENG.
5.1.2. The probe unit includes the nose cone that houses the contact
tip, the main body section, the tail unit (which houses the
reference electrode female plugs and the connection cable
with strain relief, the reference electrode elements, the
tee handle mount for manipulator mounting and the
ying lead connection back to the readout unit.
5.2. Nose cone
5.2.1. The nose cone assembly is screwed into the main body
section. The cone houses the replaceable contact tip and
also has the female connector that attaches to the male pin
on the extension cable from the tail unit. Tips are made from
stainless steel plated with nickel; the nose cone is fabricated
from a rugged thermoplastic.
5.3. Main body section
5.3.1. The body section, made from a rugged thermoplastic,
protects the reference electrode elements and is designed to
t the tee handle mount for
convenient manipulator
mounting.
Figure 5:
ROV-II
corrosion
probe

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holes in the side allow the body to become free-ooding and
were specically engineered to allow for accurate potential
measurements.
CAUTION
Do not cover or modify these or add additional holes in the body.
5.4. Tail unit
5.4.1. The tail unit attaches to the main body section with
two (2) stainless steel cap screws. The connection cable
passes through this unit and is strain-relieved with a spiral
strain-relief tting. The tail unit includes one male connector
for the contact tip and two female connectors for each of the
reference electrodes.
5.5. Reference electrode elements
5.5.1. Two plug-in sintered silver/silver chloride elements are
included; electrode elements are accurate to ± 5 mV. See the
operations and maintenance section for instructions on
electrode replacement.
CAUTION
Never handle electrode elements with bare hands or expose elements
to any liquid other than water; permanent damage may result.
5.6. ROV-II probe T-handle mount
5.6.1. The T-handle mount allows easy interface with most
manipulator systems. The mount is made from 316
stainless steel and Delrin®.
5.7. Flying lead
5.7.1. The standard ying lead is 10 ft (3 m) long. A longer
lead can be provided if it is necessary to use a rear-facing
camera to look at the readout. The lead has a polyethylene
abrasion-resistant sheath and has connectors on either end
that mate with the bulkhead connector on the readout and the
whip cable on the probe unit.

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6.0 Spare parts and accessories
6.1.The Deep-C Meter is shipped in a waterproof transit case and
contains the following spares and accessories. Please contact
your Polatrak representative to order additional spares
if required.
6.1.1. Zinc calibration block (1)
6.1.2. Contact tips
6.1.3. Lens retaining screws (4)
6.1.4. O-ring lube (1)
6.1.5. Silicone connector lube (1)
6.1.6. Bulkhead connector dummy plug (1)
6.1.7. Ag/AgCl electrode element
6.1.8. Lens back-up ring (2)
6.1.9. Lens O-ring (4)
7.0 Calibration
7.1. Bucket calibration procedure
7.1.1. Fill a non-metallic bucket or container with enough
seawater or simulated seawater to completely submerge
the probe unit.
7.1.2. Place the probe in the bucket with the tip pointing up so
the body lls with seawater. The entire probe must be
immersed, including the tip.
7.1.3. Clean the zinc coupon with a le or sandpaper to
remove any oxide layer and place it into the bucket.
7.1.4. Wait thirty minutes for the electrode elements to
reach equilibrium.
7.1.5. Stab the zinc coupon rmly onto the probe tip.
(alternatively, the contact tip can be removed and the cable
can be attached directly to the nose cone as indicated below)
7.1.6. The upper displays on the readout unit should read
between (-) 1000 & (-) 1100 mV. Both displays should read
within ± 5 mV (the decimal point is not displayed).

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7.1.7. If the readings are not within this range, please see the
troubleshooting section.
7.1.8. Note: If the probe has not been used in a while, it may
take another 15 – 30 minutes for the electrode elements to
reach equilibrium.
7.2. Underwater online calibration
7.2.1. While free-ying, both voltmeter displays are reading
the potential of the tip contact. This number will vary
depending on ROV speed, time of immersion and whether a
protected structure has been recently stabbed. Normally, the
reading will be in the (-) 200 to (-) 400 mV range, and both
displays should be within ± 5 mV.
7.2.2. If the readings are not within ± 10 mV, the probe unit is
out of calibration. The survey can continue until the ROV can
be brought back to the surface if both readings are recorded.
8.0 Operation
8.1. Mounting on ROV
8.1.1. Find a good location on the vehicle to mount the display
unit and attach the articulated mount. Typically, the display
unit should be in view at the same time as the probe unit to
maximize efciency. The lens on the unit must be camera-
visible and have a light source directed at it to activate the
displays. Ensure that all fasteners are tight and that all
locknuts and washers are in place. Leave the lens cover in
place while the unit is on deck (unless calibrating) since the
displays are light-activated and battery life will be reduced.
8.1.2. Insert the probe unit into the compliant tee-handle
probe mount and position in a manipulator or tool basket that
is manipulator accessible.
8.1.3. We recommend tying a safety lanyard to the probe’s
mounting U-bolts.
8.1.4. Ensure that lock rings for the dove tails are properly
mounted and secured.
8.1.5. Ensure fasteners are tight and lock nuts are in place.

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8.1.6. Route the ying lead in such a way that it will not be
stressed, entangled or pinched during manipulator operation.
8.1.7. Apply a small amount of the provided connector
sealant to the shoulder of the ying lead connector, ensuring
that no sealant is applied to the copper pin. Connect the ying
lead to the probe lead and tighten the connector lock ring.
Please refer to the MSDS in the appendix before handling
the sealant. All appropriate Personal Protective Equipment
(PPE) shall be worn, including safety glasses and gloves as
a minimum.
8.1.8. Perform bucket calibration (see section 7.1)
8.1.9. Using a 7/16” wrench, ensure that the contact tip is tight
on the nose cone.
8.1.10. Ensure that the tip is sharp.
8.1.11. Remove the lens cover from the instrument.
9.0 Taking CP potential readings
9.1. Stab the tip contact probe onto the point on the structure
where the reading is required, when a good contact is made
the reading on the displays will show a steady reading.
CAUTIONS
Avoid stabbing painted or coated surfaces whenever possible. Try to
take readings on bare steel or on spots specially designated for CP
measurement.
• If necessary, anodes can be stabbed. However, if possible, it is best to
stab the anode band which is grounded to the structure.
• Avoid trying to stab through heavy, hard marine growth if possible.
• The probe unit should be kept out of the mud, as this may contaminate
the electrodes.
• If the readings are not steady or don’t match the criteria in the table in the
next section, it’s probably due to a high resistance contact. DO NOT RE-
CORD THESE NUMBERS. Continue to stab until readings are in specica-
tion. See troubleshooting section if problems persist.
• NEVER operate the system with any of the connectors un-mated unless