When a device is suspected of having a problem, don’t grab the work order and go out into the plant to “see what might be wrong.” There is a more productive approach! This “user guide” outlines an alternative proactive maintenance method, using the smarts in your current installed intelligent devices with FDT® Technology doing the troubleshooting work for you! Focusing on brownfield applications using legacy 4-20mA systems, we will identify a path for you to jump start your maintenance strategy for your installed assets starting with just a single device (or point to point) connection. This paper will motivate maintenance team members and encourage them to use a PC and a FDT enabled configuration application (free), to configure and diagnose a single device enabling lower maintenance costs and increased plant reliability.