The sintered Ag/AgCl reference electrode provides very accurate potential data to monitor polarization of the structure. The heavy-duty zinc electrode element provides a long-term, ultra-reliable, low-resolution electrode. The compact current density coupon allows placement in confined spaces. The rugged 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 1 square meter current density monitoring array, such that polarization data may be logged directly from the instrument.

Use of permanent monitoring systems has grown recently, based on increased integrity emphasis and the ease of data telemetry. The DR-2 CD represents the latest innovation in cathodic protection monitoring from the world’s leading supplier of these systems.

Offshore platform jackets & drill rigs.

Seawater ballast tanks on SPAR, TLP, and FSU / FPSO structures

SPAR center well areas.

Inshore structures, piers, jetties, wharves.

Subsea equipment wired to SunStation permanent readout.

As impressed current CP controller.

The DR2 CD combines two instruments: the DR-2 reference cell (yellow and black) and a current density monitor (top array).

DR-2 CD shown in-situ on bare framing

of an offshore jacket.

Offshore installation in progress.

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.

Ideal for seawater ballast tanks or areas where post installation access is difficult.

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 Conduit interface	ASTM A36 carbon steel Marine epoxy 2” pipe coupling or 2” 150# blind flange
Dimensions	W x H x D	27” x 6” x 6” (68.6 x 15.2 x 15.2 cm)
Current Density Fins	Material Insulator Finish Shunt	ASTM A36 carbon steel, 0.125" (3 mm) plate Natural Ddelrin isolation plate and spacers Sandblast 1 mV = 10 mA per square meter
Cable	Type	42 x #12 AWG PVC insulated, PU bedded, DGSWA, HMWPE. Sheathed available upon request.