Hemi 100, 100 cm2 Steel Spherical Coupon by Farwest Corrosion

Spherical Shape Coupon for Cathodic Protection Testing

Cathodic protection coupons are a simple, size-specific piece of metal with one or more wires attached and are used for evaluating corrosion control or cathodic protection systems protecting a structure, typically a steel pipeline. These measurements include:

  • Native or unprotected structure-to-soil potentials
  • Structure-to-soil potentials with the CP system energized
  • Structure-to-soil potentials with the CP system interrupted
  • To emulate an “OFF” structure-to-soil potential without interrupting CP current, typically referred to as a “Coupon Interrupt” reading
  • For magnitude measurements of AC current density on a structure with known induced AC issues

Hemi-100 Coupon Details

The "Hemi-100" steel C.P. coupon is a 100 cm2 spherical coupon design to improve contact with earth.  The larger, sperical shape helps with soil contact upon burial.  

The coupon is mounted on a durable PVC housing and the Hemi-100 is provided with a dual length of #12 AWG stranded copper cable with RHH/RHW direct burial insulation, typically green in color.



Hemi-100 Coupon Ordering Information

  • Specify the Hemi-100 steel coupon
  • Choose a cable length of 25, 50, 75 or 100 feet (Note that a dual cable is standard on the coupon)
  • Select a cable insulation color (green is the Farwest standard) such as white, blue, orange, etc.

(Size: 0.17 MB)