Way Ahead In Corrosion Control

DR-2 Dual Reference Cell

Zn and Ag / AgCl reference electrode for monitoring CP

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The DR-2 uses both zinc and silver chloride reference electrodes for accuracy and longevity.

The DR-2 is a rugged, dual-element reference electrode designed for permanent subsea attachment to provide cathodic protection potentials. A standard DR-2 is designed to last 20 years. Both electrodes are housed in a machined Delrin body, giving the assembled DR-2 excellent impact resistance.

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Zinc Element

Material: Zinc (high purity 99.95%)
Weight: 12 lb. (5.45 kg)
Dimensions: 6" x 5" x 1.5" (15.2 cm x 12.7 cm x 3.8 cm)
Anti-passivation: Embedded carbon steel rods
Accuracy: +/- 0.02 volts

Silver Chloride Element

Material: Sintered Ag/AgCl w silver wire core
Weight: 0.09 oz (2.5 gm)
Dimensions: 0.47" Dia. x 0.20" (1.2 cm Dia. x 0.5 cm)
Accuracy: +/- 0.005 volts

Key design points

Fewer inspections: Structures with permanent cathodic protection monitoring systems can be inspected subsea much less frequently, since interval surveys can be performed with a simple voltmeter.

Rugged design: The rugged design allows the DR-2 to be welded reliably to the structure and wired to the surface at minimal cost prior to deployment.

Conduits not needed: The double steel-wire armored cable can be free-routed on offshore structures with simple bands or cable clamps, saving the cost of conduit or duct systems.

High accuracy: The dual elements combine the high accuracy +/- 0.005 V of the silver / silver chloride electrode with the proven longevity of a zinc electrode.


DR-2 Gallery

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