UG PDI System EXPERT Proximity Detection Interface System as per level 9 EMERST The EX PDI is a flameproof system that is certified by MASC. The EX PDI system is a mechanical design that can interface with any PDS system for level 9 requirements. The EX PDI system was tested on all criteria’s by the university of Pretoria and was awarded a pass – project number P007316-022-2019. The EX PDI system View and Download BrochureRequest an AppointmentLet us know how we can help You. Request an Online Appointment using the Form below. I agree that my submitted data is being collected and stored.