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Electrochemical H2 Hydrogen Sensor FS02500

  • H2 gas detection sensor module

  • Support UART and MODBUS-RS485

  • Three-electrode electro-chemical sensor

  • Outstanding anti-interference

  • Temperature compensation

  • Reliable service for sustainable cooperation

Electrochemical H2 Hydrogen Sensor FS02500 Introduction

FS02500 is a fuel cell type electrochemical sensor that works by an oxidation or reduction reaction occurring on its working electrode and counter electrode, releasing charged ions and creating a current. The magnitude of the current produced is proportional to the concentration of hydrogen and follows Faraday’s law. By measuring the size of the current, the concentration of hydrogen can be determined. The sensor uses high-stability gas sensors and high-performance microprocessors and supports UART output and Modbus-RS485 output. The module is calibrated and tested using precision automated calibration and detection equipment to reduce human interference, ensuring accurate and consistent data while also ensuring large-scale production efficiency.

Electrochemical H2 Hydrogen Sensor FS02500 Features

1.Detection range

Default: 0~1000 PPM


2.High accuracy, high consistency, high solution, rapid response

Data detection accuracy MAX error: ±≤3% reading

Minimum solution: 1PPM

Response time: T90 ≤60s


3.Data output methods

FS02500 supports UART and MODBUS-RS485;

Customizable: 4~20mA、0~5V、0~10V


4.Long service life

The lifetime is up to 1 year (in the air)


5.High detection frequency

The data updates once per second by default.


1.Gas detectors, instrumentation equipment
2.Industrial Production Safety
3.New energy vehicles
4.New energy production and storage equipment


Parameter type

Parameter index

Detection Type

H2 Gas

Detection Principle

Three-electrode electro-chemical

Detection Range




Max Load


Detection Accuracy



Data Accuracy

Max error±≤3% Reading

Operation Voltage

DC 3.7V~5.5V

Operation Current

≤0.3mA (@5V power supply)

Warm-up Time

3 min

Detection Frequency

The data is updated once per second (Default)

Output Methods

 Default: UART (3.3V_TTL Voltage level)

Reserve: MODBUS-RS485

Customizable: 4~20mA、0~5V、0~10V

Service Life

1 Year (in the air)

Reference Dimension

32.3×32.3×16.5 mm

Operation Temperature

-30℃ ~ 50℃

Operation Humidity

0~95%RH (Non-Condensation)

Storage Temperature

0℃ ~ 20℃

Storage Humidity

0~95%RH (Non-Condensation)

Pressure Range

800~1200 mbar

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