Fermion: MEMS Hydrogen H2 Gas Detection Sensor

Overview

The module is a MEMS-based gas sensor designed to detect Hydrogen (H) gas in the environment.

• Target gas: Hydrogen (H)

• Output: Analog signal proportional to gas concentration

• Designed for low-concentration hydrogen detection and monitoring

It is used for safety monitoring, especially in environments where hydrogen leakage is a risk.

Working Principle

MEMS Chemiresistive / Micro-Heater-Based Sensing

Most MEMS hydrogen sensors operate using a metal-oxide semiconductor (MOS) sensing layer:

1. Micro-Heater Activation

• A built-in micro-heater heats the sensing material to an optimal temperature

2. Gas Interaction

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• Causes a change in electrical resistance

3. Resistance Change

• H presence resistance changes (typically decreases)

4. Signal Conversion

• Internal circuitry converts resistance variation analog voltage output

Output voltage corresponds to hydrogen concentration.

Measurement Characteristics

• Detection range: typically tens to thousands of ppm (H)

• Sensitivity: high for hydrogen gas

• Response time: typically < 30 seconds (T90)

Electrical Characteristics

• Operating voltage: 3.3V to 5V

• Power consumption:

  • Higher than passive sensors due to heeater operation

  Output Interface

  Analog Output

  • Voltage proportional to gas concentration

  • Requires:

    • ADC (microcontroller)

     

   

  Signal Behavior

  • Clean air baseline resistance/output

  • Hydrogen presence measurable voltage change

   

  Internal Features

  MEMS Microfabrication

  • Compact sensor design

  • Fast thermal response

   

  High Sensitivity to Hydrogen

  • Detects small concentrations effectively

  Fast Response & Recovery

  • Quick detection and return to baseline

  Compact Integrated Heater

  • Ensures proper sensing conditions

  Operating Behavior

  Warm-Up Time

  • Requires initial warm-up for heater stabilization

  Environmental Influence

  • Affected by:

    • Temperature

    • Humidity

    • Airflow

     

  Environmental Characteristics

  • Works in typical indoor/industrial environments

  • Requires:

    • Good airflow for accurate sensing

     

   

  Limitations

  • Cross-sensitivity possible with:

    • Other combustible gases

     

  • Requires:

    • Calibration for accurate ppm measurement

     

  • Heater increases:

    • Power consumption

     

  • Sensor aging may affect long-term accuracy

   

  Functional Role

  The module acts as a:

  • Hydrogen gas detector

  • Analog gas concentration sensor

    component

   

  Summary

  The Fermion MEMS Hydrogen (H) Gas Sensor is a compact, sensitive gas detection module that:

  • Detects hydrogen gas using MOS-based MEMS technology

  • Uses a micro-heater for active sensing

  • Provides analog output proportional to concentration

  • Offers fast response and good sensitivity

  • Is optimized for hydrogen leak detection and safety systems<