Understanding the 4-20mA Current Loop: Understanding the 3-15 psi Pressure Signal Why use 4-20 mA and 3-15 psi rather than 0-20 mA & 0-15 psi? Advantages of 4-20 mA vs 0-20 mA Fault Detection and Diagnostics: Zero Offset Adjustment: Cost Efficiency with 2-Wire Systems: Integration of Power Supply and Signal Circuit: Advantages of 3-15 psi … Continue reading Why not use 0-20mA & 0-15psi instead of 4-20mA & 3-15psi?