The Deepwater Polatrak DC-II is the first and only twin element portable reference electrode of its kind. The twin elements provide on-board calibration, eliminating the possibility of topside survey inaccuracies.

The DC-II is used to survey more offshore structures worldwide than any other portable drop cell-style cathodic protection probe, and it has been specified by a large number of operators as the only acceptable choice of equipment. The evolution of this instrument over its 15 years has been largely based on the assumption that responsible asset management begins with accurate cathodic protection testing.

Ease of use, and most importantly, accuracy, are of chief importance to the offshore CP technician. The DC II boasts guaranteed accuracy +/- 5 mV. Trips offshore are expensive, and there is no need to repeat a mobilization due to faulty equipment.

The rugged thermoplastic housing with tapered cone prevents snagging. The DC-II is available with extra-long cable and high capacity cable reel with up to 1500 ft. of test cable (standard model shown with 250 ft. (75 m) of cable).

Key Design Features

1. Guaranteed accuracy:  Many common sources for error are eliminated with the twin element configuration. The dual silver / silver chloride (Ag/AgCl) electrodes provide internal redundancy and on-line calibration, allowing the probe to be reliably tested and readings verified in the field.
    
2. Extremely rugged:  The DC II has been used on more offshore corrosion surveys for offshore structures than any other drop cell (dip cell).
    
3. Price competitive:  The DC-II costs about the same as old-fashioned single element electrodes. Readings can be obtained with a simple dc voltmeter.

Applications

• Platform and riser surveys.
• As remote for multiple electrode surveys.
• Drill rigs & FPSO surveys.
• Ballast & water tank surveys.
• Jetty and dock surveys.

The drop cell is interrogated by a simple voltmeter.