The Universal Process Interface Unit (UPIU) is Honeywell's latest upgrade for installation in existing High Level PIU (HLPIU), Low Level PIU (LLPIU), and Low Energy PIU (LEPIU) boxes on TDC 2000/3000 systems. The new UPIU can replace previously installed HLPIU, LLPIU, and LEPIU electronics or can be used in new installations.
New technology components reduce component quantity and size and also increase component reliability . By using fewer, more reliable components and increasing the internal diagnostics, system reliability and robustness is improved. One new PWA replaces four old technology PWAs therefore fewer spares are required. UPIU components are backward compatible with previous releases of the PIUs.