HW-685 Current to Voltage Module 0/4-20mA to 0-3.3V/5V/10V

HW-685 Current to Voltage Transmitter Signal Converter Module

Convert 0/4–20mA current loop signals into precise 0–3.3V, 0–5V, or 0–10V voltage outputs with the HW-685 Current to Voltage Signal Module. Ideal for industrial automation, PLC interfacing, sensor integration, and any application that requires accurate signal conversion between current and voltage domains. Compact, reliable, and easy to configure — this module is a must-have for engineers and electronics enthusiasts alike.

Made in Mainland China.

Key Features

• Wide Input Range: Accepts both 0–20mA and 4–20mA current loop signals
• Flexible Voltage Output: Selectable output of 0–3.3V, 0–5V, or 0–10V to match your system requirements
• Wide Supply Voltage: Operates from 7–36V DC (supply must exceed 12V for 10V output)
• Adjustable Zero & Span: On-board ZERO and SPAN potentiometers for precise calibration of minimum and maximum output voltages
• Reverse Polarity Protection: Built-in protection prevents damage from accidental reverse wiring
• Power Indicator LED: D2 status LED confirms power-on operation at a glance
• Compact Form Factor: Measures just 42mm × 25mm × 10mm — easy to integrate into tight enclosures
• Lightweight: Only 11g package weight

Specifications

How to Use

1. Wire the module according to the terminal definitions printed on the board.
2. Apply a power supply voltage between 7–36V DC. The D2 LED should illuminate — if it doesn't, check your wiring connections.
3. With the current input at its minimum value (0mA or 4mA), adjust the ZERO potentiometer until VOUT reads the desired minimum (e.g. 0.0V).
4. With the current input at its maximum value (20mA), adjust the SPAN potentiometer until VOUT reads the desired maximum (3.3V, 5V, or 10V).

Package Contents

• 1 × HW-685 Current to Voltage Converter Module

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For safety standards related to electrical and electronic equipment, refer to guidance from the National Institute of Standards and Technology (NIST).

Learn more: Analog-to-digital converter

Frequently Asked Questions

Q: What power supply voltage is required for the HW-685 current to voltage converter module?

A: The HW-685 module operates on a supply voltage of 7–36V DC. However, if you need the output to reach 10V, you must ensure the supply voltage is greater than 12V. A standard 12V or 24V industrial power supply works well for most applications.

Q: Can the HW-685 module handle both 0–20mA and 4–20mA current loop inputs?

A: Yes. The HW-685 current to voltage signal converter supports both 0–20mA and 4–20mA input ranges. You can calibrate the minimum output using the ZERO potentiometer and the maximum output using the SPAN potentiometer to match your specific sensor or PLC signal range.

Q: Is the HW-685 module protected against reverse polarity wiring?

A: Absolutely. The HW-685 features built-in reverse polarity protection, meaning accidental reverse connection of the power supply will not damage the board — giving you peace of mind during installation and testing.

Q: What voltage outputs can I select on this current to voltage module?

A: The module supports three selectable output voltage ranges: 0–3.3V (ideal for microcontrollers like Arduino or STM32), 0–5V (for standard analog inputs), and 0–10V (for industrial PLCs and control systems). Output is adjustable via the onboard ZERO and SPAN potentiometers.