4-20mA to 5V Converter for Arduino Industrial Sensor Interface Board

Product Description The 4-20mA to 0-5V Converter Module is an essential interface for connecting industrial-grade sensors to microcontrollers like Arduino, ESP32, and Raspberry Pi. In industrial automation, the 4-20mA current loop is the standard for long-distance signal transmission because it is highly resistant to electrical noise. This module accurately converts that current signal into a linear voltage range (typically 0-5V or 0-3.3V), which can be easily read by an Analog-to-Digital Converter (ADC). Featuring high-precision on-board multi-turn potentiometers, it allows for fine-tuning of the Zero (offset) and Span (gain) points, ensuring perfect calibration between your industrial transmitter and your digital controller.

Key Features

• Industrial Standard Interface: Bridges the gap between 4-20mA industrial sensors (pressure, flow, level) and 5V/3.3V microcontrollers.

• Wide Supply Voltage: Operates on a broad input range from 7V to 35V, making it compatible with standard 12V and 24V industrial power supplies.

• Zero & Span Calibration: Equipped with high-precision trimmers to calibrate the 4mA point to 0V and the 20mA point to your desired maximum voltage.

• High Precision: Low temperature drift and high linearity ensure that the integrity of the sensor data is maintained throughout the conversion process.

• Reverse Polarity Protection: Integrated safety circuitry protects the module from damage caused by incorrect power wiring.

Technical Details

• Operating Principle: Translates the current flowing through a precision shunt into a buffered voltage signal via an operational amplifier.

• Output Range Flexibility: By adjusting the Span potentiometer, the output can be scaled to 2.5V, 3.3V, 5V, or 10V (if supply voltage allows).

• Current Loop Compatibility: Supports both 2-wire and 3-wire current transmitters.

• Noise Suppression: Built-in hardware filtering reduces high-frequency EMI often found in industrial environments.

• Zero Adjustment (ZERO): Allows the user to set the output voltage when the input current is at its minimum (4mA).

• Range Adjustment (SPAN): Allows the user to set the maximum output voltage when the input current is at its maximum (20mA).

• Isolation Note: This is a non-isolated module; ensure the ground of the current loop and the microcontroller are commoned or referenced correctly.

• Thermal Stability: Components are selected for minimal value shifting across varying ambient temperatures.

• PCB Construction: Industrial-grade FR-4 PCB with high-quality screw terminals for secure field wiring.

• Current Consumption: The module itself draws very low quiescent current (typically <5mA).

• Signal Linearity: Maintains a deviation of less than 0.2% across the entire 4-20mA spectrum.

• Input Impedance: Designed to present a standard load to the current loop, ensuring it doesn't interfere with other instruments in the series.

• Compact Form Factor: Small enough to be mounted inside industrial junction boxes or on DIN rail carriers.

• LED Status: Includes a power indicator LED for visual confirmation of the supply rail.

• Protection: Output is current-limited to prevent damage to the microcontroller's ADC pin in case of sensor over-range.