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4-20 mA to Engineering Units

Convert loop current to process value and back.

Inputs

Loop input and range

Live loop current. Below 3.6 mA usually means wire break.

Process value for reverse calculation.

Value at 4 mA.

Value at 20 mA.

Alarm thresholds

Readings below this flag a wire break. NAMUR NE43 uses 3.6 mA.

Readings above this flag saturation. NAMUR NE43 uses 20.5 mA.

Result

Engineering value
50.000
Loop current reverse (mA)
12.000
Calculation details
Percent of span (%)
50.00
Voltage across 250 ohm (V)
3.000
Wire break (1=yes)
0
Over-range flag (1=yes)
0

Verify

Check before relying.

Trust the subtraction, then the meter.

  • LRV/URV match the transmitter nameplate
  • 4.00 mA reads LRV on a series meter
  • DCS faceplate agrees within 0.1% FS
This calculator is a first-pass screening tool. Verify nameplate data, wiring, module configuration, and calibrator readings before acting.

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Workspace

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