Model UC Data Sheet

Model UC - Underground CP Coupon

Typical Application

Any underground structure requiring potential readings with negligible IR drop error.

Featuring

Patented split coupon design removes up to 98% of soil IR drop error in current-on measurements
Can be easily fitted to the base of a test station riser
Potential measurements can be made with either portable or permanent reference electrodes.

	Specifications 1 ½ sq. in. (10 sq. cm.) exposed steel surface 2 inch (nom.) PVC pipe construction Size - 2 1/2 inches dia. x 11 inches long (6.4 cm x 28 cm long) Shipping weight - 6 lb (2.8 kg)
	Terminations (twin heads) SW - 10 feet (3 m) of #14 AWG THHN LWnnn - nnn feet #14 AWG THHN CWnnn - nnn feet of custom wire
	Model Designation Specify as EDI Model UC-BDG-yy yy = Termination type
	Measurements Measurements can be made with either a permanent reference electrode contained in the riser pipe or a portable reference electrode contacting the riser fill. In some areas, it may be necessary to moisten the fill to increase its conductivity to an acceptable level. Either Cu/CuSO₄ or Ag/AgCl references may be used.

Design Compatibility
The Model UC-BDG Underground Cathodic Protection Coupon is fitted to the base of a test station riser. It is designed to allow essentially IR-drop free measurements made with CP current on. The amount of IR-Drop error included in a current-on measurement will be very small, typically less than 20 mV, and therefore can be ignored in routine measurements. Since many factors contribute to the magnitude of IR-Drop error at any particular site, it is recommend that each installation be evaluated separately.
U.S. Patent 6,060,877 – Produced under license.