Buckleys BATHYCORROMETER User manual

BUCKLEYS
BATHYCORROMETER®
INSTRUCTION
MANUAL
READ THIS MANUALBEFORE USING THE EQUIPMENT.
Buckleys (UVRAL) Ltd.
Beta Works, Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
E-Mail:- sale[email protected]o.uk web site:- www.buckleys.co.uk

Page 1
Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
CONTENTS
Section Title Page No
1.0 Unpacking 2
2.0 General Description 2
2.1 Probe Tips 2
2.2 Blanking Plug 2
2.3 Battery 3
3.0 Technical Data 3
3.1 BCMUnit 3
3.2 Charger 3
4.0 Operation 4
4.1 Charger 4
4.2 BCMUnit 4
5.0 Maintenance 5
6.0 Reference Electrode 5
Replacement
7.0 Safety 6
7.1 Electromagnetic Compatibility 6
8.0 Calibration 7
8.1 Electronics Calibration Check 7
8.2 Test Procedure using 7
CalomelReferenceElectrode
9.0 Test using Zinc Test Block 8
10.0 Long Term Storage 9
10.1 LayingUp 9
10.2 Re-commissioning 9
TestCertificate 10
Declaration of Conformity 11

Page 2
Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
1.0 Unpacking
1. Check that the following are in the case:-
-Bathycorrometer unit, White with Red nose cone.
-Charger, oblong box with a lead coming out of each end.
-6 Stainless Steel pointed Probe Tips.
-A spanner to fit the Probe Tips.
-A 5 pinned rubber Plug with White Locking Ring.
-A small tube of Silicone Grease.
-This Instruction Manual
If any of these are missing, contact your supplier immediately.
2. Keep the packaging in case the unit needs to be sent back for repair in the future,
or needs to be stored.
2.0 General Description
The Bathycorrometer® (BCM) is an underwater corrosion volt meter, powered by a
rechargeable battery. This current model has been developed from the original model
and on the very successful Bathycorrometer® MkV. The unit is fitted with a 3½ digit
high impedance (10 megohms) LCD Volt Meter which is backlit for operation in murky
conditions. The unit can read voltages as low as 0.001V up to 1.999V D.C.. The
corrosion potential is detected by a Silver/Silver Chloride (Ag/AgCl) reference
electrode of extremely robust and proven construction, mounted in the protective nose
cone and sited only 5cm from the probe tip.
2.1 Probe Tips
Six standard probe tips are supplied with the instrument. They are provided with a
standard point, suitable for use on steel work with coatings of either paint or tape etc., as
used on steel piles, under sea pipelines and through thicker coatings, marine growth and
the like.
The probe tip is fitted to the front of the instrument by screwing it onto the stainless
steel stud and tightened with the spanner provided. A definite bottoming should be felt
when the probe has been screwed fully home. Silicone grease smeared on the outside of
the probe will assist fitting through the “O” ring seal.
2.2 Blanking Plug
The unit is switched ON by using the 5 pinned Blanking Plug provided. This should be
disconnected when the instrument is out of the water in order to conserve battery life.
Silicone grease smeared on the plug will greatly facilitate its insertion. The plug is NOT
underwater pluggable and must be inserted before the instrument is immersed,
otherwise spurious readings and damage to the socket will occur.

Page 3
Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
2.3 Battery
The unit is powered by a re-chargeable Nickel Metal Hydride battery. Under normal
usage, a fully charged battery will provide over 50 hours of operation. Low battery
voltage is indicated by a battery symbol appearing at the top left hand side of the LCD
display. Because the battery is Nickel Metal Hydride it has the advantage of no memory
effect and can be topped up charged unlike the older Nickel Cadmium type.
The BCM should only be charged using the charger supplied. Use of the incorrect
charger could lead to damage to the electronics which would not be covered by the
warranty.
3.0 Technical Data
3.1 BCM UNIT
Operating depth to Up to 300m (Pressure tested to 600psi 42bar)
Display 3½ digit LCD backlit 0.001 to 1.999V DC
Accuracy 0.05% typical (±1 count)
Input impedance >10MW
Operating temperature range 0 to 30°C
Temperature stability ±100 ppm/°C
Storage temperature range 0 to 50°C
Operating time on full charge50hr +
Reference electrode Silver/Silver Chloride (Ag/AgCl)
Accuracy Ag/AgCl +5mV (±5mV)
Temperature coefficient 0.2mV °C
Effective Life 1 to 2 years if looked after
Contact with structure Hardened, Stainless Steel probe
Output input socket for Charging, reference test, remote readout and on off
switching
Weight in air 2.5Kg
Weight in water 0.85Kg negative buoyancy
Instrument size 100mm diameter x 275mm long
Carrying case size 450mm x 340mm x 220mm
3.2 BCM Charger
Supply Voltage:- 110V to 240V A.C. 45-55 Hz
Input Power :- 3.5 VA maximum
Output voltage :- 10.5V D.C. open circuit.
Output Current :- 30mA ± 2mA
Charging indicator :- Green LED

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Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
4.0 Operation
4.1 Charger
1. Connect a suitable main plug to the charger, the plug should be fitted with a fuse
of 1Amp or 3 Amp rating. Connect the Brown wire to the Live (L) terminal and
the Blue wire to the Neutral (N) terminal There is no connection to the Earth (E)
terminal.
2. The BCM as supplied may not be fully charged, it is recommended that the BCM
is charged for 24hours before initial use.
3. Connect the charger to the BCM. Check the orientation of the plug on the charger
as it will only connect one way.
4. Connect the charger to the mains supply, the Green led light in the centre of the
charger should illuminate, if not check the connection to the BCM and that the
mains power is on.
5. The normal time to re-charge the battery from flat is 14 hours, but it can be left on
charge for up to 48 hours without damage to the battery. The battery can be
topped up after use by giving a charge of 12 minutes for each hours use.
6. There is no indication on the charger or the BCM that the battery is charged. If the
charger is turned off it will not discharge the BCM.
7. When charging is complete, disconnect the charger from the mains supply and
then from the BCM.
4.2 BCM Unit
1. Fit a pointed probe tip to the end of the instrument using a smear of Silicone
grease to help stop damage to the “O” ring seal. Use the spanner provided to make
sure that the probe tip is fully home.
2. Smear the Blanking Plug Pins with some Silicone grease and insert the plug into
the socket in the handle of the BCM. This switches the BCM on.
3. Screw the White Blanking Plug retaining ring into the handle to stop the Blanking
Plug from being accidentally removed. NOTE:- The Blanking Plug must NOT be
removed under water.
4. The unit as supplied has been fully tested and calibrated in the factory. However
some drying out of the reference electrode may have occurred and it is
recommended that prior to initial use the unit is soaked in Seawater for 20 to 30
minutes.
5. The BCM is now ready for use. If required the calibration can be checked, see
section on Calibration.

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Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
6. To take a reading under water just push the pointed probe onto the steel structure
making sure that contact is made to the steel. The corrosion potential at that point
can now be seen on the display.
7. After use, wash the BCM in clean Seawater to remove any debris from inside the
red nose cone, and then re-charge the unit using the charger supplied. As a guide
the BCM will require 12 minutes charge for each hour of use. The BCM can be
charged for periods longer than 14 hours. It is possible to charge the BCM for up
to 48 hours without damage to the battery, if using the charger supplied.
5.0 Maintenance
Very little maintenance is required apart from keeping the unit clean and ensuring that
the holes in the red nose cone are kept clear of any obstructions such as dirt or marine
growth etc.
Check the Calibration of the BCM’s electronics and the reference electrode at regular
intervals.
If the unit has been used in a dirty environment the red nose cone should be flushed
with clean sea water to remove any contamination which would shorten the life of the
reference cell.
Clean the socket in the handle of the BCM and apply a smear of Silicone grease to it
and the plug to stop the contacts corroding.
Check the condition of the “O” Ring in the White Delrin Probe Cone and replace if
necessary.
The battery charger must be maintained in accordance with local statutory requirements
for maintenance of portable electronic equipment.
6.0 Replacement of the Screw in Reference Electrode
1. Remove the Stainless Steel Probe Tip if Fitted.
2. Using a pair of grips, remove the White Delrin Probe Cone.
3. Remove the stainless steel slotted nut and washer from the Tie Rod.
4. Gently “rock” and remove the Red Nose Cone, which will expose the grey plastic
Reference Electrode.
5. Carefully unscrew the Reference Electrode.
6. Ensure that there are no foreign bodies in or around the seat of the Reference
Electrode and the “O” Ring around the Tie Rod.
7. Smear the “O” Ring and the thread on the new Reference Electrode with Silicone
Grease.

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Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
8. Screw in the new Reference Electrode until the “O” Ring just seats, then tighten
half a turn and no more. Over tightening the Reference Electrode could snap the
thread.
9. Replace the Red Nose Cone, ensuring that there is no debris or foreign matter
around its seat, and that the cut out is positioned to accommodate the Reference
Electrode.
10. Replace the stainless steel washer and slotted nut and tighten so there is no gap
between the Red Nose Cone and the White Body.
11. Check the “O” rings on the inside and outside of the white Delrin Probe Cone and
replace if necessary, smear the “O” rings with a little Silicone Grease, and replace
the white Delrin Probe Cone onto the Tie Rod.
12. Replace the stainless steel Probe Tip, if fitted.
7.0 Safety
All diving operations which involve the use of the Bathycorrometer must be carried out
in accordance with the current local statutory requirements for conducting Diving
Operations at Work.
7.1 ELECTROMAGNETIC COMPATIBILITY -
EUROPEAN UNION DIRECTIVE 89/336/EEC:
The BCM and its charger do not generate RF energy so will not interfere with other
electronic equipment. The BCM is a sensitive volt meter, which when in use under
water would be screened from electromagnetic interference by the sea, however when
on the surface, being calibrated, interference may cause the BCM to give incorrect
readings. If this is the case, investigate to see if any transmitting equipment is in
operation i.e. radio telephones, radar or if any arc welding is being carried out. Also
electrical storms can have an effect.

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Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
8.0 Calibration
There are two parts of a BCM that affect calibration. Firstly the electronics and
secondly the Ag/AgCl reference Electrode.
8.1 Electronics Calibration Check
The Electronics in the BCM can be checked with the aid of a BCM Checker (Not
Supplied), this, when connected to the BCM, produces an precision voltage of 1.990V
DC which can be compared with the BCM’s reading. This is just a check as the
electronics are contained inside the pressure housing and cannot be adjusted without
breaking the seal. Undoing the pressure housing voids the warranty. The unit should be
returned to Buckleys if the reading on the BCM is more than ± 10mV out from the
1.990V test voltage. Check that it is not the BCM Checker that is at fault first.
8.2 Test Procedure using screw on Calomel Reference Electrode
1. Unscrew the white Delrin Probe Cone.
2. Smear the “O” ring on the Calomel Reference Electrode with a little Silicone
Grease.
3. Screw the Calomel Reference Electrode onto the threaded Tie Rod, ensuring a
tight connection and correct seating of the “O” ring.
4. Fit the Blanking Plug and immerse the BCM in Seawater, ensure that the level
covers the Red Nose Cone.
5. Allow the Electrode to reach a stable potential (10 to 15 minutes).
6. The voltage difference between the Calomel Electrode and the internal
Silver/Silver Chloride Electrode can be read directly off the digital display on the
BCM.
Note 1:
The values recorded for the Silver/Silver Chloride Electrode are dependent upon
the Salinity and Temperature of the Seawater at the time of measurement.
Note 2:
The Det Norske Veritas (D.N.V.) specification “Guidelines in Potential
Measurement on steel structures” gives the potential value for the Ag/AgCl
Electrode as -4mV ± 5mV. This is with the Ag/AgCl Electrode connected to the
Negative terminal of the voltmeter, however in the BCM the Ag/AgCl Electrode
is connected to the Positive terminal in accordance with conventional standards.
To comply with the D.N.V. specification the value for the Ag/AgCl Electrode will

Page 8
Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
therefore be +4mV ±5mV (@ 20°C). Since the polarity of the reference electrode
potential will be reversed.
9.0 Test using Zinc Test Blocks
A quick check of the operation of the BCM can be carried out using a Zinc test block.
Potential measurements taken should be logged to check if any significant variation
occurs. Differences in the order of 10mV or so between readings are quite possible and
will mainly be caused by variations in water salinity at different locations or due to
changes in water temperature. As a guide, readings taken in a 3% salt solution at
ambient temperature of 25°C are as follows:-
Zinc (Zn) = 1.00 - 1.05V
Soak the BCM for 2 hours in a Seawater solution. The salt concentration has a great
effect on the readings, so does the state of the test block. A tarnished block will give a
lower reading than clean one. Do not leave the test block in the Seawater, remove after
use.

Page 9
Buckleys (UVRAL) Ltd. Range Road, Hythe, Kent. United Kingdom. CT21 6HG.
Tel:- [phone]/8 Fax:- [phone]
10.0 Long Term Storage
10.1 Laying Up
1. Flush well in clean Seawater to remove any contamination from the Red Nose
Cone and allow to dry. If salt encrustation is seen on the Red Nose Cone, remove
the Ag/AgCl half cell and briefly wash in fresh water but immediately after
thoroughly rinse in Salt water (3% salt solution)
2. Clean the Blanking Plug and the socket in the handle. Apply Silicone grease to the
plug and fit it into the handle to get the Silicone grease into the socket. Re-apply if
necessary. Then remove the Plug, re-grease ready for storage.
3. The BCM can be stored with the battery in any state of charge.
4. Place the BCM, Charger, probes, probe spanner, Silicone grease and this
Instruction Manual into the carrying case.
5. Store the BCM in an ambient temperature not less than 0°C or greater than 40°C.
Storage outside these temperature will destroy the LCD display.
10.2 Re-commissioning
1. Remove the BCM from its case and fit the Blanking Plug. If the display comes on
then charge the BCM for 14 hours. If the BCM is dead, charge for 24 hours.
2. Fit the Blanking Plug and leave the BCM working. If it is still working after 50
hours then the battery has recovered its full capacity. If it is not working then the
battery is faulty and the BCM and Charger should be repaired.
3. Soak the BCM for 2 hours in a Seawater solution.
4. Carry out calibration checks, see calibration.