420I-AAXX-8 IMO Signal Conditioner – Isolator 4-20mA I/P 4-20mA O/P

Why Choose the IMO 420I-AAXX-8 Loop Powered Isolator?

The IMO 420I-AAXX-8 is a compact loop powered signal isolator designed for industrial automation and process control applications using standard 4–20 mA instrumentation signals. It generates a second galvanically isolated current loop from an existing process loop, allowing instrumentation signals to be transferred between control devices while providing electrical isolation.

Power for the 420I-AAXX-8 is derived directly from the 4–20 mA input loop, so no separate external power supply is required. This simplifies control-panel wiring and makes the isolator particularly useful for retrofits and installations where additional auxiliary power is unavailable. Its low voltage drop also helps minimise its effect on the existing instrumentation loop.

With a 4–20 mA input and isolated 4–20 mA output, high noise immunity and 1000 V galvanic isolation, the 420I-AAXX-8 can be used to isolate signals from non-isolated transmitters or reduce interference between instrumentation devices. It is also useful where equipment such as a PLC and local recorder need to monitor the same process measurement without creating unwanted electrical interaction.

Key Advantages

• Compact loop powered 4–20 mA signal isolator for industrial instrumentation.
• No external power supply required, simplifying control-panel installation.
• 1000 V galvanic isolation between process signals.
• Low voltage drop minimises loading of the existing current loop.
• High noise immunity helps improve signal integrity in industrial environments.
• Allows isolated transmission of process measurements to control and monitoring equipment.
• Suitable for isolating non-isolated transmitters and reducing ground-loop interference.

Key Features

• IMO 420I-AAXX-8 loop powered isolator.
• 4–20 mA current input.
• 4–20 mA galvanically isolated current output.
• Single output channel.
• Power derived directly from the input signal loop.
• 1000 V isolation.
• Maximum voltage drop of approximately 3.5 V at 20 mA.
• High noise immunity for industrial signal transmission.
• Designed for automation and process control applications.
• RoHS compliant.

Reliable 4–20 mA Signal Isolation for Process Control

A loop powered isolator provides galvanic separation between instrumentation circuits without requiring a separate auxiliary power source. In the IMO 420I-AAXX-8, energy is taken from the existing 4–20 mA loop and used to reproduce the process signal on an electrically isolated output, helping prevent ground loops and unwanted interaction between connected control equipment.

This makes the 420I-AAXX-8 particularly useful when a process transmitter signal must be connected to equipment with non-isolated inputs. Typical examples include PLC analogue input modules, local indicators and chart recorders. The isolation barrier and high noise immunity also help maintain dependable signal transmission in electrically noisy industrial environments.

Typical Applications

• 4–20 mA process signal isolation.
• PLC analogue input isolation.
• Industrial process control systems.
• Transmitter signal isolation.
• Ground-loop and electrical noise reduction.
• Process instrumentation and monitoring systems.
• Control panels and industrial automation equipment.