The new Uni-Probe LB 490/491 for radiometric level and density measurement now supports field network systems like Profibus PA and Fieldbus Foundation. Furthermore the instrument can be switched to HART communication. The 4-20 mA current output is available all the time and can be used for local display. Several user industrial interfaces are provided for communication and parameter settings (e.g. Simatic PDM, Hartkommunikator, DTM). Additionally the Uni-Probe LB 490/491 is authorized according to ATEX and FISCO.