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4–20 mA Signal & Scale Calculator

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4–20 mA Signal & Scale Calculator

Linear 4–20 mA span: mA = 4 + 16·(x−xmin)/(xmax−xmin). Inverse: x = xmin + (mA−4)/16·(xmax−xmin).

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What is 4–20 mA Signal & Scale Calculator?

Converts between 4–20 mA process signals and engineering values for pressure, temperature, flow, and similar ranges.

4–20 mA Signal & Scale Calculator Formula / Method

Value=Min+((I−4)/16)×(Max−Min)Value = Min + ((I−4)/16) × (Max−Min)
I=4+((Value−Min)/(Max−Min))×16I = 4 + ((Value−Min)/(Max−Min)) × 16
SpanSpan % = ((I−4)/16) × 100

4–20 mA Signal & Scale Calculator Worked Example

Range0–500PSI,I=12mARange 0–500 PSI, I=12mA
Value=0+(8/16)×500=250PSIValue = 0 + (8/16)×500 = 250 PSI
For375PSI:For 375 PSI:
I=4+(375/500)×16=16mAI = 4 + (375/500)×16 = 16 mA

Where 4–20 mA Signal & Scale Calculator Is Applied

  • PLC/DCS scaling
  • Transmitter calibration
  • Instrumentation commissioning
  • SCADA mapping

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