Cathodic protection CP coupons is used to simulate an exposed section of buried pipe or structure for the purpose of conducting IR drop free potential measurements.
IR drop errors are a significant source of inaccuracy in potential measurements on underground structures. There are a number of sources of them including the structure's own cathodic protection current and stray currents from other sources.
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In theory, IR drop free potential measurements can be made by interrupting all current sources simultaneously and making an "instant off" potential measurement. In practice, this is very difficult so CP coupons are used instead.
CP coupons simulate an uncoated part of the structure to which they are electrically bonded. Measurements are made by momentarily disconnecting the coupon and recording the "instant disconnect" potential. This reading approximates an IR-drop free potential on the structure at the location of the coupon.
They are particularly useful in areas subject to stray currents and on all cathodic protection systems where the synchronised interruption of current supplies is complex or impractical. Download Bornagodaz General catalouge.
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Platinized Anode. Lead Silver Anode. High Silicon Cast Iron Anode. MMO Anode. Reference Electrodes and Accessories. Metal Structures. Zinc Earthing Cell. Reference Electrodes. Farwest Hemi Dual Steel Coupon. The dual coupon assembly is provided with three or four cable leads as needed.
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Farwest Cyclone Steel Coupon. This is a common design for steel coupons utilized for cathodic protection testing and measurement. Detailed drawings are available for each of the listed coupon models. Please contact your local Farwest representative for this information, pricing or other needed information.
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