1. BLOCK DIAGRAM:
Micro controller

2. DAC and HART specification:

3. 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

4. Current Output:
Output shall be Configurable – 0 / 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 VDC
Resolution for current output: 0.4μA
HART 7 standard compatible
Current output shall be NAMUR NE 43 compliant