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Work out the maximum load resistance a current loop can drive before it can no longer reach 20mA: R_max = (supply voltage - transmitter minimum) ÷ 0.020 A. Enter a planned total burden and it returns the voltage drop at 20mA, the remaining headroom, and whether you are in compliance, which is the check before adding a HART resistor or a panel indicator.

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4-20mA Loop Burden Calculator

LOOP 4–20mA loop burden

Max load resistance the loop can drive, and whether a planned total burden stays in compliance at 20mA.

Max load @ 20mA600 Ω
Drop @ 20mA5.00 V
Headroom7.00 V
Statusin compliance

Max load = (supply − transmitter min) ÷ 0.020 A.

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