Hemi 100, 100 cm2 Steel Spherical Coupon by Farwest Corrosion

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.