Understanding the Benefits of 4-20ma Signal Isolators

In industrial settings, signal isolators are crucial devices that enable safe and reliable communication between different components. When dealing with 4-20mA signals, choosing the right isolator is essential to ensure efficient transmission and reception of data. In this article, we will delve into the world of 4-20ma signal isolators and explore their benefits, applications, and how they can be used effectively.

One of the primary advantages of using a 4-20mA signal isolator is its flexibility in terms of location. Since both the input and output signals are 4-20mA, the device's placement is not critical. Typically, it is situated close to the field device, allowing for easy integration into existing systems. Additionally, these isolators can be placed anywhere between the sensing device and the PLC/DCS or monitoring equipment, making them highly versatile.

Another significant benefit of 4-20ma signal isolators is their ability to control current draw from the power supply in the output loop. This ensures that the power consumption remains consistent, even when adding additional devices to the system. Moreover, these modules are ideal for applications requiring an isolator with a power supply in series with the output signal.

One common application of 4-20ma signal isolators is as a current repeater or to drive resistive loads. These devices can be used to extend the range of the signal while maintaining its integrity. Furthermore, they can be used to add monitoring instruments to existing current loops without requiring an additional power source for the added loop or the isolator.

When selecting a 4-20ma signal isolator, it is essential to consider factors beyond just channel count and cost per point. The output of the isolator must be powered by the input loop power and drive passive loads only. Acromag, experts in I/O solutions, offer a range of signal isolators designed specifically for industrial applications.

In conclusion, 4-20ma signal isolators play a vital role in ensuring reliable communication between devices in industrial settings. By understanding their benefits, applications, and how they can be used effectively, engineers can design and implement efficient systems that minimize the risk of errors and downtime. Whether you need to extend the range of your signals or add monitoring instruments to existing loops, 4-20ma signal isolators are an essential component in any industrial automation setup.

Additional Resources

For more information on choosing the right 4-20mA isolator, please refer to our application note 'How to Choose a 4-20mA Isolator'. Additionally, you can access our whitepaper 'Why Do I Need Electrical Isolation?' and our top 3 Ethernet industrial isolation papers for further insights into the world of signal isolation.

4 to 20ma signal isolator