The fieldbus digital level controller provides new levels of performance and information access to help users improve operations. In addition to displacement sensor technology for measuring liquid level or the level of interface between two liquids, the unit uses the digital FOUNDATION fieldbus communication protocol to deliver diagnostics, alerts and other information that helps users improve performance while avoiding unexpected downtime. Digital communication also makes it easy to configure, calibrate, and test the digital level controller using the manufacturer’s software or 475 Field Communicator, and to integrate the instrument with new or existing control systems. Guided setup and calibration leads the user through the instrument setup, process fluid selection, and calibration in an easy-to-use format. The instrument stores up to 30 logs including calibration, instrument setup, and process fluid data that can be saved for future reference or re-use. The unit is designed to directly replace pneumatic, analog, or HART® transmitters/controllers. To provide additional flexibility, it can be mounted on a wide variety of cageless and caged level sensors as well as on other displacer type level sensors through the use of mounting adaptors.