Cathodic Protection Monitoring
DR-2 CD™ polarization monitor (CP potential / current density sensor)

Basic Description

A rugged dual element (Ag/AgCl sw / Zinc) reference electrode designed for weld-on, bolt-on or clamp-on attachment to an offshore structure (or pipeline). The dual element configuration provides the high-accuracy and calibration capability of Silver Chloride with the long term reliability of Zinc. 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 sq. meter current density monitoring array, such that polarization data may be logged directly from the instrument.

Zinc Electrode 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 Electrode 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

Electrode Housing

Material: Black declaring Dimensions: 18" x 5" x 4" (45.7 cm x 12.7 cm x 10.2 cm)
Cable Encapsulation: Cold Mold Soft Polyurethane made inside embedded PVC condulet within electrode housing.

Electrode Frame

Material: ASTM A36 Carbon Steel
Coating: 0.015" Marine Epoxy
Conduit Interface: 2" Pipe Coupling or 2" 150# Blind Flange

Current Density Fins

Material: ASTM A36 carbon steel 0.125" Plate (3 mm)
Finish: Sandblast
Insulator: Natural Delrin isolation plate and spacers
Shunt: 1 mV = 10mA/sq. M

Cable

4 x #12 AWG PVC Insulated, PU Bedded, DGSWA, HMWPE. Sheathed (available upon request).