BLOCK DIAGRAM: Micro controller
DAC and HART specification:
Current Input: 0 / 4-20 mA input – HART / Non-HART (0-20 mA or 4-20 mA) Supply voltage – 24 VDC (Internal / External) Configurable to – Pressure or Temperature input from external transmitter for special calculation like Petroleum measurement & API Correction option or for dynamic corrections of pressure & temperature effect. Current input shall be capable to detect the fault according to the NAMUR NE 43 compliance (Low & High threshold signal failure definition – 3.8 mA & 20.5 mA). User should be able to configure alarm for particular fault. There should be option to provide isolation
Current Output: Output shall be Configurable – 0 / 4 - 20 mA, (0-20 mA or 4-20 mA) Active / Passive Selectable Active: Super imposed with HART signal for one current output only Passive: Supply voltage- 18-30VDC Resolution for current output: 0.4μA HART 7 standard compatible Current output shall be NAMUR NE 43 compliant