Instrumentation Calculators

# Frequency(Hz) to 4 to 20 mA Signal Conversion Calculator

Welcome to our Frequency to Analog 4 to 20 mA Signal Conversion Calculator. This tool is designed to help you easily convert frequency signals into a standard 4 to 20 mA current loop signal, widely used in industrial applications for transmitting sensor data over long distances.

In many industrial processes, sensors generate signals in the form of frequency, representing various physical parameters such as flow rate, speed control, or rotational velocity. These frequency signals need to be converted into a standard 4 to 20 mA analog signal for compatibility with most industrial control systems, including Programmable Logic Controllers (PLCs), Distributed Control Systems (DCS), and data acquisition systems.

This below instrumentation calculator is designed to help you easily convert frequency signals into a standard 4 to 20 mA current loop signal.

Our Frequency to Analog 4 to 20 mA Signal Conversion Calculator is user-friendly. Follow these simple steps to perform the conversion:

1. Input the Frequency Range:
• Minimum Frequency (Hz): Enter the minimum frequency value corresponding to the 4 mA output.
• Maximum Frequency (Hz): Enter the maximum frequency value corresponding to the 20 mA output.
2. Input the Current Frequency:
• Current Frequency (Hz): Enter the frequency value you wish to convert to a 4 to 20 mA signal and the outputfield will display the  mA .

The conversion from frequency to a 4 to 20 mA signal is typically linear and can be calculated using the following formula:

Where:

• ImA​ is the output current in milliamps (mA).
• Current Frequency is the input frequency in Hertz (Hz).
• Minimum Frequency is the frequency corresponding to 4 mA.
• Maximum Frequency is the frequency corresponding to 20 mA.

Let’s say you have a sensor with a frequency output range of 0 to 1000 Hz. You want to convert a current frequency of 500 Hz to a 4 to 20 mA signal. Here’s how you would use the calculator:

• Minimum Frequency (Hz): 0
• Maximum Frequency (Hz): 1000
• Current Frequency (Hz): 500

After that the tool will provide the corresponding mA output, which in this example would be 12 mA

• Reliability: 4 to 20 mA current loops are less susceptible to electrical noise and signal degradation over long distances compared to voltage signals.
• Diagnostic Capability: A 4 mA signal can indicate a system or sensor fault, while a 20 mA signal typically represents the full-scale reading. Signals outside this range can be used to diagnose issues.
• Simplicity: Current loops are straightforward to implement and maintain, making them a preferred choice in industrial environments.