NDB SonoTEVi-Air sensor

The SonoTEVi-Air™ sensor has built-in TEV (transient earth voltages) and airborne ultrasonic sensors for partial discharge detection on metal clad cabinets. It design is suited for installation inside the metal-clad cabinet.



The PD Annunciator™ unique design consists of a three channels acquisition module paired with sensors of your choice, most commonly TEV and Acoustic or HFCT. With many advancements and innovations, the PD Annunciator™ handles partial discharge monitoring on metallic cabinets using our proven and advanced technologies.


• TEV, Acoustic & HFCT sensor technologies
• Easy to install
• Intuitive software
• Modbus connectivity
• Local USB connectivity
• Single or multi-module installation

Additional information