One CP-protected Coupon

These instructions detail how to wire a single CP-protected coupon (with either one or two wires) to measure AC and/or DC pipe-to-soil, AC and/or DC current density, and instant off. Refer to the following figures for reference.

RM4210/RM4250 Wiring Harness

Wiring Diagram - Single CP-Protected Coupon

If the coupon has one wire connecting it to the test station, connect both the red Test Cpn 1 wire and the blue Test Cpn 2 from the RM4210/RM4250 wiring harness to the test station where the coupon wire is connected.

If the coupon has two wires connecting it to the test station, complete the following steps:

1. Connect one of the coupon wires to one side of the switch on the test station. Connect the red Test Cpn1 wire from the RM4210/RM4250 wiring harness to the other side of the switch.

2. Connect the blue Test Cpn 2 wire from the RM4210/RM4250 wiring harness to the point on the test station where the second coupon wire is connected.

3. Cap off the orange AC Coupon wire from the RM4210/RM4250 wiring harness. It is not used for this set up.

To set up for this type of measurement on Bullhorn Web, complete the following:

1. Make note of the size of the CP-protected coupon (Protected Cpn 1 in the wiring diagram). This data will be entered in Bullhorn Web using the following steps:

   1. Go to the Unit Setup page for the unit.

   2. Under Settings, enter the CP-protected coupon size in the Test Coupon Size field.



Unit Setup for Test Coupon Settings