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

Basic description

A rugged dua- 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, so 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).