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.
Specifications
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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