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2015 Deepwater Corrosion Services Inc. Specifications subject to change without notice
Deep C Meter 300 AD™
operation manual
8
SMB-001 Deep C Meter 300 AD Manual
7. Calibration tests
With all the parts connected, the probe(s) should be tested in a non-metallic bucket as described in section
7.2 to verify that all components are within calibration prior to deploying the ROV.
7.1.
Deep C Meter 300 AD™ calibration
7.1.1
Power-on the unit and allow approximately 5-10 seconds for the automatic boot-up calibra-
tion process to complete.
7.1.2
Apply a known potential between 0.100V - 2.400V (battery or portable power supply).
Measure the potential directly with a multimeter.
7.1.3
Measure the potential reading with the Deep C Meter 300 AD™. These two potentials
should be within ± 3 mV. If the difference is greater, send the calibration command through the
RS232 interface. Please see section 12.2 for further details.
7.2. Bucket calibration check
Contact calibration check (see Figure 7)
7.2.1
Fill a clean, non-metallic bucket or container with seawater approximately 16 –18 inches
deep. Ensure that the bucket has been completely degreased and rinsed.
7.2.2
Place the probe in the bucket with the tip at an angle to fill the body with seawater. The
entire probe, including the tip, must be immersed. Ensure there is no trapped air in the unit.
7.2.3
Attach or stab the zinc coupon firmly onto the probe tip. The upper two display lines on the
LED readout should read between (-) 1.030V and (-) 1.070V and be within 0.005V of each other.
NOTE:
If the probe has not been used in the past 24 hours, it may take 15-30 minutes for the
probe to reach equilibrium.
EFG calibration check (only applicable if using the EFG probe)
7.2.4
Ensure both sets of holes on the EFG probe are submerged. Ensure there is no trapped air
in the probe. If the bucket is too short, remove the tail assembly and place the electrode directly in
the water.
7.2.5
The bottom display line should be less than ± 2 mV. If not, one of the electrodes may need
replacing.
7.2.6
Activate the zinc coupon by removing a small section of oxide film with a file or rasp.
7.2.7
Place the zinc coupon directly in front of the probe.
7.2.8
The bottom display line should become more negative.
7.2.9
Remove the zinc coupon. The bottom display line should return to the original value
in step 7.2.5.
7.3. Subsea calibrations
7.3.1
While approximately 30 feet away from surrounding structures / assets, stab the isolated
zinc ROV calibration coupon with the probe’s contact tip.
7.3.2
The upper two display lines on the readout should read between (-) 1.030V & (-) 1.070V and
be within 0.010V of each other. Make note of this difference for future readings.
7.3.3
If the EFG probe is connected, the bottom display line should go more negative as the
probe approaches the coupon and become more positive as the EFG probe moves away. If the
EFG probe is not connected, the bottom display line should be disregarded.
7.3.4
It is recommended that this test be performed at the beginning and end of each dive, every
two hours or at a pre-determined calibration period.