The H2 gas sensor detects 0-1000/2000/5000 ppm using an electrochemical system. It has 7.5 ±2.5 nA/ppm sensitivity, 10 ppm resolution, and T90 <100s response time. Works in -30°C to 50°C, 15%-90% RH. Ideal for industrial and environmental monitoring.
Specification
Model |
ATO-S4H2 |
Detection Principle |
Electrochemical Three-Electrode |
Detected Gas |
H2 (Hydrogen) |
Detection Range |
0-1000/2000/5000ppm |
Sensitivity |
7.5 ±2.5 nA/ppm |
Zero Drift |
±1 ppm |
Resolution |
1ppm (0-1000/2000ppm), 10ppm (0-5000ppm) |
Response Time |
T90<100s |
Bias Voltage |
0 mV |
Load Resistance |
5-30Ω |
Temperature Range |
-30°C to 50°C |
Humidity Range |
15%RH to 90%RH (Non-condensing) |
Repeatability |
±2% Output Signal |
Long-term Stability |
<2% Signal/Month |
Linearity |
Linear |
Operating Pressure |
90 to 110 kPa |
Warranty |
12 months after delivery |
Service Life |
2 years |
Dimension (Unit: mm)
Crossover Interference
The chlorine dioxide (ClO2) gas sensor also responds to gases other than the target gas. For reference, the response characteristics of the sensor to several common interfering gases are listed in the table below. The data in the table are typical responses of interfering gases at a given concentration.
Interfering Gas |
Gas Concentration (PPM) |
Displayed Value (PPM/H₂) |
CO |
50 |
150 |
SO₂ |
20 |
0 |
H₂S |
100 |
0 |
Cl₂ |
10 |
0.5 |
NO |
50 |
10 |
NO₂ |
30 |
1 |
Basic Test Circuit

Application
Hydrogen (H₂) gas sensor can be used in environmental quality testing, industrial robots, chemical plants, coal mines, instrumentation, underground pipelines, fruit and vegetable gardens, greenhouses and so on.

Tips: Why is it important to detect hydrogen gas?
Hydrogen (H₂) is colorless, odorless, highly flammable, and explosive when mixed with air at concentrations between 4% and 75% (40,000 to 750,000 ppm). Since it is difficult to detect without specialized equipment, hydrogen leaks pose a significant fire and explosion hazard in industrial settings.
The H₂ gas sensor provides real-time monitoring, helping to prevent leaks, ensure workplace safety, and comply with industry regulations. It is widely used in fuel cells, chemical plants, battery storage systems, and hydrogen refueling stations to reduce risks associated with hydrogen gas accumulation.