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SenseCalc

HART Loop Capacitance Check

FSK impedance with 150nF verdict.

Inputs

Loop capacitance

One-way run.

From cable datasheet.

Transmitters plus indicators.

Result

Total C (nF)
60.0
Z at 1200Hz (ohm)
2,210
Calculation details
Z at 2200Hz (ohm)
1,206
PASS (1=yes)
1

Verify

Check before relying.

Capacitance loads the FSK signal.

  • Cable pF/m from the datasheet
  • Device count includes indicators
  • Total under 150 nF for reliable HART
This calculator is a first-pass screening tool. Verify nameplate data, wiring, module configuration, and calibrator readings before acting.

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