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Electrochemical H2 Hydrogen Gas Sensor FS02501

  • H2 gas detection sensor module
  • Support UART and MODBUS-RS485
  • Three-electrodeelectro-chemical sensor
  • Outstanding anti-interference
  • Temperature compensation
  • Reliable service for sustainable cooperation

Electrochemical H2 Hydrogen Gas Sensor FS02501​ Introduction

FS02501 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 Gas Sensor FS02501​ 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

FS02501 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 0~1000PPM
Max Load 2000PPM
Detection Accuracy Solution 1ppm
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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