Polatrak CP-Gun User manual

CORROSION TESTING PROBE
Deepwater Corrosion Services Inc.
polatrak.com | [phone] |Email: [e-mail]
©2023 Deepwater Corrosion Services Inc. Specications subject to change without notice
CP-GUN™
DIVER-HELD CP PROBE
OPERATION MANUAL
Twin reference
electrodes verify
calibration during use
Ultra-bright LED
displays for limited
visibility conditions
On-off switch
for season-long
battery life

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13813 FM 529 Rd, Houston, TX 77041 | US [phone] | Email: [e-mail]
©2023 Deepwater Corrosion Services Inc.
2SMB-008 CP-Gun Manual Rev. 2
CP-GUN™ MANUAL
Table of contents
1 Overview 5
2. Scope 5
3. Health and safety 5
4. Risk assessments 5
4.1. General hazards 5
4.2. Specic hazards 6
4.3. Environmental hazards 6
5. Reference documents 6
5.1. Drawings 6
5.2. Photos 6
5.3. MSDS documents 6
6. Components 7
6.1. Main body 7
6.2. Reference electrodes 7
6.3. Voltmeter 8
6.4. Bulkhead connector 8
6.5. Lens 8
6.6. Contact tips 8
6.7. On/off power switch 9
6.8. Spare parts and accessories 9
7. Calibration 9
7.1. Bucket calibration check 9
7.2. Underwater online calibration 11
7.3. Measuring potentials 11
7.4. Data interpretation 13
8. Maintenance 14
8.1. Overview 14
8.2. Tip replacement 14
8.3. Electrode element replacement 14
8.4. Battery replacement 16

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CP-GUN™ MANUAL
9. Troubleshooting 17
9.1. Electrode element replacement 17
9.2. Battery replacement 19
10. Appendix 19
List of tables
Table 1 - Normal cathodic protection ranges for bare
carbon steel in seawater 13
Table 2 - Troubleshooting quick guide 18
Table 3 - CP Gun™ spare parts list 19
List of figures
Figure 1 - Kit components 4
Figure 2 - Probe components 4
Figure 3 - Calibration coupon attachment 10
Figure 4 - Bucket calibration readings 11
Figure 5 – Seacon RMG-3FS wiring diagram 15
Figure 6 – Calibration schematic 20

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4SMB-008 CP-Gun Manual Rev. 2
CP-GUN™ MANUAL
CP-Gun™
Figure 1
Kit components
Calibration
coupon
Lens cover
Spare
reference
electrode
Tips
Replacement O-rings
Batteries
Screws
Float
Lanyard
Transit
case
CP Gun
O-ring
lubricant
Insulating
compound
3/16”
Allen
key Spare parts
storage
Figure 2
Probe components
Pressure
housing
Reference
electrodes
O-rings
LED
readout
unit
Readout
lens
Readout
lens
retaining
screws
Contact
tip
Nose cone
assembly
Electrode
harness
Element
housing
On/off
switch
Handle

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5SMB-008 CP-Gun Manual Rev. 2
CP-GUN™ MANUAL
1. Overview
The CP Gun™ is designed for situations where a few contact CP read-
ings are required. This diver-held probe can be stored easily on a tool
belt when not needed by the diver. The CP Gun™ outperforms all other
bathycorrometer-type devices on the market in accuracy and con-
venience. Longer battery life, interchangeable freshwater / seawater
electrodes and ultra-bright LED displays (for limited visibility situa-
tions) make the CP Gun™ the most user-friendly diver-held CP probe
available. The dual electrodes and readouts allow verication of the
reference electrodes even as the diver works.
2. Scope
The purpose of this document is to instruct the user how to use and
maintain the CP Gun™, including taking potential readings and replac-
ing the elements and batteries.
3. Health and safety
3.1 General
It is the intention of Deepwater Corrosion that all test and inspec-
tion procedures are to be carried out in a safe manner in accord-
ance 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 on-site
work.
3.2 MSDS
Where applicable, substances hazardous to health shall be listed
and itemized in the form of a register. Health and safety data sheets
for all hazardous substances shall be kept in a le for reference.
Site personnel shall be issued copies of health and safety data
sheets relevant to their work activities.
4. Risk assessments
4.1 General hazards
4.1.1 Site safety - There are various risks associated with work-
ing on any site. Regulations required by the site owner/operator
should be observed.
4.1.2 Personal Protective Equipment (PPE) - Eye protection

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CP-GUN™ MANUAL
and disposable rubber gloves should be worn as a minimum of
personal protective equipment when maintaining the CP Gun™,
in addition to any other equipment required by the site operator
or deemed necessary by the task.
4.2. Specific hazards
4.2.1 Measuring potentials - The contact tip of the probe is very
sharp and can cause serious damage to the user if not handled
with care. It should NEVER be used to remove marine growth or
coatings.
4.2.2 Impressed Current Cathodic Protection (ICCP) is present-
Transformers should be turned off BEFORE any person enters
the water in that area.
4.3 Environmental hazards
The copper (II) sulphate, deionized gel solution contained within
the Cu / CuSO4reference electrodes is potentially hazardous.
Observe all federal, state and local regulations when disposing
of this substance. Please ensure that proper personal protective
equipment (PPE) is worn during disposal. For further information,
please refer to the MSDS.
5. Reference documents
5.1 Drawings
5.1.1 Figure 4: Bucket calibration readings
5.1.2 Figure 5: SEA CON® RMG-3FS connector pin diagram
5.1.3 Figure 6: Bucket calibration check with Zn coupon
5.2 Photos
5.2.1 Figure 1: Kit components
5.2.2 Figure 2: Probe components
5.2.3 Figure 3: Calibration coupon attachment
5.3 MSDS documents
5.3.1 Parker Seals - Parker O Lube MSDS – O-ring lubricant
http://www.parker.com (search for: MSDS Super O-Lube)
5.3.2 Dow Corning – 4 Electrical Insulating Compound MSDS
(Connector sealant)
http://www.dowcorning.com/applications/search/products/De-

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7SMB-008 CP-Gun Manual Rev. 2
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tails.aspx?prod=01903128&type=PROD
5.3.3 McMiller – Leak Stop Gel – Copper (II) sulphate electrolyte
MSDS http://documents.mcmiller.com/msds.html
Please contact your Polatrak representative for any questions and/or
issues regarding this manual.
6. Components
The probe components are shown in Figure 2 along with a parts list in
Table 3. The CP Gun™ with handle weighs 6.3 lb (2.86 kg) in air and 1.5
lb (0.68 kg) in water. The following is a description of the major compo-
nents:
6.1 Main body
The rugged thermoplastic main body of the CP Gun™ comprises two
sections: a water-tight pressure housing which contains the LED
readout unit, batteries and electronic circuitry, and a free-ooding
element housing, which contains the reference electrodes, contact
tip and wiring harness. These two halves are separated by unscrew-
ing counterclockwise. This allows access to the probe contact tip
connection and the reference electrodes. The tip connector attaches
to the electrode harness, and once it’s unplugged, the entire elec-
trode housing can be removed. The electrode elements and contact
tip can be replaced as necessary. Please see Table 3 for part num-
bers and ordering information.
6.2 Reference electrodes
The CP Gun™ uses two replaceable silver/silver chloride (Ag/AgCl)
reference electrodes. Alternatively, copper/copper sulfate (Cu/
CuSO4) elements can be used for potential measurements taken in
fresh water. The electrodes are plugged into the electrode harness
via pressure-resistant connectors. To ensure proper function of the
reference cells, several points should be observed:
6.2.1 Any time the elements are replaced, a thin layer of connector
sealant should be applied to the rubber shoulder of the male end,
ensuring no sealant is applied to the copper pin. Please refer to the
MSDS before handling. All appropriate Personal Protective Equip-
ment (PPE) shall be worn, including safety glasses and disposable
gloves as a minimum.

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8SMB-008 CP-Gun Manual Rev. 2
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6.2.2 NEVER immerse the CP Gun™ with any of the connectors
un-mated.
6.2.3 Take care when handling reference electrode elements —
NEVER get oil or grease on them.
6.2.4 NEVER touch elements with your ngers. Do not use solvent
cleaners on the electrode; use only fresh water to clean.
6.2.5 After every use, soak the CP Gun™ in fresh water for at least
1 hour. This will extend the life of the electrodes.
6.3 LED readout unit
Each reference electrode is connected to its own voltmeter LED
readout. Both voltmeters are contained in a pressure housing fac-
ing the rear of the CP Gun™. Power is supplied to these voltmeters
by two standard, replaceable PP3 9-volt alkaline batteries. To ac-
cess, see Section 8, maintenance.
6.4 Bulkhead connector
The probe tip and reference cells are connected to the voltmeters
via a Seacon 3-pin bulkhead connector. Before use, ensure that the
connector is properly tightened. A thin layer of connector sealant
should be applied to the rubber shoulder of the male end, ensuring
no sealant is applied to the copper pin. Please refer to the MSDS
before handling. All appropriate Personal Protective Equipment
(PPE) shall be worn including safety glasses and disposable gloves
as a minimum.
6.5 Lens
The lens is made from a clear, acrylic material. The only reason to
remove the lens is to replace the 9-volt batteries which power the
LED readout unit.
6.6 Contact tips
Tips should be replaced once a stable potential reading can no
longer be obtained.
Tips should not be sharpened with a le or hammered into a point.
To replace, remove the existing tip with a 7/16” (or 10mm) wrench;

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9SMB-008 CP-Gun Manual Rev. 2
CP-GUN™ MANUAL
ats are best. Ensure that the new tip is tight, but do not overtighten
(max torque 50 inch-lbs).
6.7 On/off power switch
The CP Gun™ is powered on with the red rotational magnetic
switch. With the switch in the rear (off) position, rotate the switch to
the on (forward) position. If the meter does not power on, check the
batteries (Section 8, maintenance). When the CP Gun™ is not in use,
switching it off will extend the life of the batteries, enabling use of
the CP Gun™ throughout an entire survey season without the need
to replace the batteries.
CAUTION
The contact tip has been machined to a very sharp point to enable
easier readings through coatings. This point can also easily cut or
poke through human skin. Please handle with care.
6.8 Spare parts and accessories
The CP Gun™ is shipped in a waterproof transit case and includes
the following spares and accessories. Please contact your Deepwa-
ter representative to order additional spares if required.
• Zinc calibration block (1) • Silicone connector lube (1)
• Contact tip (3) • Ag/AgCl electrode element (1)
• Lens retaining screw (4) • Lens back-up ring (2)
• O-Ring lube (1) • Lens O-ring (4)
7. Calibration test
(Please also refer to schematic in Fig. 6)
7.1 Bucket calibration check
7.1.1 Fill a clean, non-metallic bucket or container with enough
seawater or simulated seawater to completely submerge the
probe unit. Ensure the bucket has been completely degreased and
rinsed.
7.1.2 Place the probe in the bucket with the tip pointing up to ll
body with seawater. The entire probe, including the tip, must be
immersed. Make sure there is no trapped air in the unit.

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10SMB-008 CP-Gun Manual Rev. 2
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7.1.3 With a le or sandpaper, remove any layer of oxide from the
zinc coupon before placing it in the bucket.
7.1.4 Wait 30 minutes for the electrode elements to reach equi-
librium.
7.1.5 Unscrew the contact tip using a 7/16” (or 10mm) wrench
(ats are best) from the nose cone and attach the zinc calibration
block’s ring terminal over the contact tip threads. (See Fig. 3.)
Reattach the contact tip as shown. (Alternatively, the zinc block
can be stabbed directly with the contact tip.)
7.1.6 Quickly ip the CP Gun™ over so the nose points down.
Rotate the red switch forward to turn on the LED readouts.
7.1.7 Read the two display lines on the LED readout. The two
voltages should be between (-) 1030 and (-) 1070 mV and should
match each other to within 5 mV. See Fig 4.
7.1.8 If the readings are not within this range, please see the
troubleshooting section.
Figure 3:
Calibration
coupon
attachment