4–20 mA Signal Scaling Calculator
Convert loop current to an engineering value or calculate loop current from user-configured signal and engineering range endpoints.
Enter instrument values
Signal conversion
About this calculator
Convert loop current to an engineering value or calculate loop current from user-configured signal and engineering range endpoints.
The tool assumes a linear transmitter configuration and does not diagnose wiring faults, process conditions, instrument accuracy, or alarm behavior.
Method and assumptions
Linear scaling maps live-zero current to the lower engineering endpoint and live-span current to the upper endpoint. Values outside either configured range are extrapolated and flagged as outside span.
Calculated results reflect only the ratios, spans, burdens, and readings entered. Verify instruments, wiring, polarity, configuration, and manufacturer limits independently.
FAQs
Can I open or disconnect a current transformer secondary while energized?
No. Never open an energized CT secondary. Follow approved electrical safety procedures and manufacturer instructions.
Does a calculated value verify billing or instrument configuration?
No. Confirm whether the meter or register already applies CT/PT scaling and verify the configured ratios with the metering documentation.
Sources
Use instrument nameplates, meter configuration records, transmitter setup data, and manufacturer compliance-voltage specifications for the installed equipment.