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4-20mA Calculator Online

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The 4-20mA Calculator is a valuable tool utilized in industrial instrumentation to convert electrical signals (ranging from 4 to 20 milliamps) into physical measurements. It operates on a fundamental formula:

Formula of 4-20mA Calculator

Measured Value = Offset + (Scale Factor × Current)

Where:

Measured Value: Represents the physical value to be calculated, such as temperature or pressure.

Offset: An adjustable value compensating for any inherent bias in the sensor or measurement system, often a constant.

Scale Factor: A constant correlation between the 4-20 mA current signal and the physical measurement units (e.g., degrees Celsius per mA).

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Current: The input signal in mA, varying within the range of 4 mA to 20 mA.

Practical Application and Significance

The 4-20mA Calculator finds extensive usage in diverse industries like manufacturing, process control, and automation. It enables precise measurement and monitoring of various parameters, aiding in critical decision-making processes.

General Terms Table

For ease of use, below are some terms frequently searched and helpful conversions:

Measured ValueOffsetScale FactorCurrent Range
TemperatureConstantUnits per milliampere4mA – 20mA
PressureFixedConversion ratioMin: 4mA, Max: 20mA
Flow RateSet valueFactors per milliampRange: 4mA-20mA
LevelSteadyCoefficients4 to 20 milliamps

Example of 4-20mA Calculator

Imagine a scenario where a temperature sensor operates with an offset of 10°C and a scale factor of 2°C per mA. If the current is 15 mA, applying the formula:

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Measured Value = 10°C + (2°C/mA × 15 mA) = 40°C

This demonstrates how the 4-20mA Calculator derives the measured temperature as 40°C based on the provided inputs.

Most Common FAQs

Q: What are the significance and advantages of using the 4-20mA current loop?

A: The 4-20mA current loop provides several benefits, such as improved noise immunity, longer transmission distances, and the ability to power sensors over the same pair of wires used for communication.

Q: Are there variations in the 4-20mA standard across different industries?

A: The 4-20mA standard is generally uniform across industries, but specific applications may have variations in terms of the physical parameters measured and the corresponding conversion factors used.

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