DR-2™ Dual Reference Cell

Polatrak^® Cathodic Protection Monitoring
in conjunction with Deepwater Corrosion Inc.

A rugged dual element reference electrode to provide CP status for 20 years.

Product Overview

The Deepwater Polatrak DR-2 is a rugged dual-element reference electrode designed to provide CP status for 20 years. Hundreds of these electrodes are in reliable service all over the world.

The current DR-2 has an improved machined black Delrin body, which enhances the impact resistance of the assembled instrument.

A sintered Ag/AgCl reference electrode provides very accurate potential data to monitor polarization of the structure. A heavy-duty zinc electrode element serves as a long-term, ultra-reliable, low-resolution electrode.

The dual-element (Ag/AgCl sw / Zinc) reference electrode is designed for weld-on, bolt-on or clamp-on attachment to an offshore structure.

Designed for permanent monitoring of cathodic protection systems, the electrode has a 20-year design life. Added to the back of the instrument is a 10 square foot current density monitoring array, such that polarization data may be logged directly from the instrument.

Available remote control monitoring systems are standard on new structures. Polatrak systems give you the option to tie into communication lines, providing remote cathodic protection monitoring over existing infrastructure.

Applications

Offshore platform jackets & drill rigs.
Seawater ballast tanks on SPAR, TLP, and FSU / FPSO structures.
SPAR center well area.
Inshore structures, piers, jetties, wharves.
Subsea equipment wired to SunStation™ permanent readout.
As impressed current CP controller.

The DR-2 dual reference cell is equipped with one Ag/AgCl and one Zn reference electrode for unparalleled accuracy.

DR-2 Dual Reference Cell in fabrication.

DR-2 Mark 1 in situ. The casing has been replaced by black Delrin on the current version, Mark 2.

Main Benefits

Structures with permanent CP monitoring systems can be inspected subsea much less frequently.
The rugged design allows the system to be preinstalled or retrofitted.
The double steel wire armored cable can be free routed on offshore structures thus saving cost of conduit or duct systems.
The dual elements combine high accuracy ±0.005V with proven longevity.
Available with integrated current density monitor (product ID: DR-2–CD).

Specifications

Zinc Electrode	Material Dimensions Weight Anti-passivation Accuracy	Zinc (high purity 99.95%) 6 x 5 x 11.5" 12 lbs (5.45 kg) Embedded carbon steel rods ±0.02 V
Ag/AgCl Electrode	Material Dimensions Weight Accuracy	Sintered Ag/AgCl w/ silver wire core 0.47" dia. x 0.20" (12 mm dia. x 5 mm) 0.09 oz (2.5 g) ±0.005 V
Electrode Housing	Material Dimensions	Black Delrin 18" x 5" x 4" (45.7 x 12.7 x 10.2 cm)
Cable Encapsulation	Type	Cold-mold soft polyurethane made inside embedded PVC condulet within electrode housing.
Electrode Frame	Material Coating Conduduit interface	ASTM A36 carbon steel Marine epoxy 2" pipe coupling or 2" 150# blind flange
Cable	Type OD Bend radius Weight/foot in air	2 x #12 AWG PVC insulated, PU bedded, DGSWA, HMWPE sheathed 0.560" (1.4 cm) 9" (23 cm) 0.366 lb (0.167 kg) 0.260 lb (0.120 kg)