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• AC & DC interrupter circuits are electrically isolated from rectifier power. 

• Housed in a polycarbonate waterproof enclosure for outdoor use.

• Continuous synchronization with GPS. 

• High accuracy internal real-time clock maintains interruption in the event of loss of satellite signal. 

• Multiple fixed program setup ensures foolproof operation and minimal setup time. 

• Interrupt D.C. up to 50 Amps at 100 Volts. 

• Interrupt A.C. up to 15 Amps at 240 Volts.

The Corrosion Service Portable Transformer Rectifier Unit (TRU) is one of the most essential tools in the cathodic protection technician’s tool box. The TRU allows a variety of surveys to be performed where they would not otherwise be possible by supplementing, mimicking, or replacing permanent cathodic protection installations. Common applications include coating holiday (DC voltage gradient) and current requirement surveys. The TRU provides high output voltage, allowing the generation of significant test currents even under high resistivity soil conditions. The unit is air-cooled with a continuously variable variac control and is conveniently fitted with an interrupter interface. Standard units are supplied with LED displays in a painted carbon steel cabinet, which is rugged enough to withstand demanding field conditions.

The amount of current that is discharged off the validation coupon is typically very small and measurement tools require micro amp resolution. Conventional ammeters are inadequate for reading small currents since the loading effect of the meter adds an error value to the reading. The ZRA overcomes this loading effect and provides an extremely precise and accurate indication of protective current.