Instrumentation Engineering

Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable Calculator

Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable engineering calculator.

Quick Answer

Calculate Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable

Calculator

Maximum allowable loop resistance (Ω)
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Result Interpretation

Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable Calculator computes Maximum allowable loop resistance in Ω using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Power supply voltage = 24
  • Maximum loop current = 0.02
  • Minimum operating voltage of field device = 10.5

Expected Result:

  • Maximum allowable loop resistance = 675

Engineering Interpretation:

Under the given input conditions, the calculated result is: Maximum allowable loop resistance = 675 Ω.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

maximum allowable loop resistance = (power supply voltage - minimum operating voltage of field device) / maximum loop current

Formula family: formula_instrumentation_instrument_loop_signal_cable_sizing_voltage_drop_checker

Variables

SymbolLabelRoleDescription
psu_voltage Power supply voltage INPUT Power supply voltage
min_operating_voltage Minimum operating voltage of field device INPUT Minimum operating voltage of field device
max_loop_current Maximum loop current INPUT Maximum loop current
maximum_loop_resistance Maximum allowable loop resistance OUTPUT Maximum allowable loop resistance

Calculation Steps

  1. Enter the power supply voltage in V.
  2. Enter the minimum operating voltage of field device in V.
  3. Enter the maximum loop current in A.
  4. Step 1: Compute maximum allowable loop resistance.
  5. Read the maximum allowable loop resistance (Ω) from the results.

Engineering Summary

Calculate Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable

Frequently Asked Questions

What does this calculator calculate?

The Instrument Loop Maximum Loop Resistance Calculator for 4–20 mA DC Twisted-Pair Copper Cable Calculator estimates Maximum allowable loop resistance based on the input parameters you provide

Why is power supply voltage important in this calculation?

power supply voltage is directly proportional to maximum allowable loop resistance. When you enter power supply voltage in V, the calculator uses it in the engineering formula to compute the output

How should I interpret the result maximum allowable loop resistance?

The calculator outputs maximum allowable loop resistance in Ω. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Power supply voltage (V), Minimum operating voltage of field device (V), Maximum loop current (A). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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