Technical Article

How Do I Know Which Dairyland Product To Use?

Wondering which of our products you need for your application?  You aren’t alone!  Our lineup of products offers a wide range of product features and ratings to cover a diverse set of applications, and it can be confusing to identify what products you should consider.

Do You Need a Decoupler or an Overvoltage Protector?

Decouplers are commonly used to isolate cathodically protected structures from other equipment grounding systems, enhancing the cathodic protection system’s performance. They also perform a function of safely grounding induced AC, fault current and lightning. Over-voltage protectors provide the same DC isolation and protection from fault current and lightning, but are not designed to address induced AC current.

Therefore, the first question to ask when selecting a Dairyland product family is whether or not there is now (or could be in the future) any induced AC voltage present. Induced AC commonly occurs on structures in close proximity to overhead powerlines. If the answer is yes, or if you are unsure, you should select a decoupler to address any present  or future issues with induced AC.

What Hazardous Location Classification Do You Have?

Commonly used products like the SSD, PCR and PCRX are designated as Division 2 or Zone 2 products.  This is a common hazardous location designation, where explosive gases and vapors are not typically present. Occasionally, sites are designated as Division 1 or Zone 1 and are rated for hazardous environments where explosive gasses and vapors are commonly present.

You’ll need to have some knowledge of how your site is classified, but this information should help you narrow your product selection down to a specific product family. You can learn more about hazardous locations here.

Using the chart below, you can easily identify product families appropriate for the conditions of your site.

product matrix


Choosing a Decoupler

Selection of the proper over-voltage protector family is based on the hazardous classification of your site. Users can then proceed with model number selection using guidelines provided on the Dairyland website. Choosing a decoupler however, can require some additional analysis. Dairyland’s full lineup of decouplers offers a range of fault current ratings, steady-state current ratings, and additional features. Using the chart below, you can evaluate the available options for each decoupler.

Notably, the PCRX line is the only product line to feature our sophisticated camouflage technology designed to address interference issues that can occur during interrupted surveys. You can learn more about identifying sites that may require the PCRX here: When do I need a PCRX?

What Decoupler Do I Need

Choosing Decoupler Ratings

Several criteria are required to select the proper decoupler ratings. Dairyland technical support teams are always willing to assist you with selecting the proper model numbers for your application.  Additionally, we have numerous articles available to assist you.

Measuring induced AC
Determining AC Fault Current
Determining maximum DC Voltage
Understanding Voltage Threshold Ratings

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