Hydrogen gas detectorBy detecting the concentration of hydrogen in the air, it can prevent the risk of combustion or explosion caused by leaks, and is widely used in industrial production (such as hydrogen energy, chemical industry), energy storage (such as hydrogen batteries), laboratory safety, and other scenarios.

　　Hydrogen gas detectorThe core is the hydrogen sensor, which detects concentration through the physical or chemical properties of hydrogen gas. The common principle is as follows:

1. Catalytic combustion method:

Hydrogen undergoes oxidation reaction (combustion) on the surface of the catalytic element (usually platinum wire) of the sensor, releasing heat to raise the temperature of the platinum wire and causing a change in resistance (according to the temperature coefficient of resistance). The change in resistance is proportional to the concentration of hydrogen gas.

2. Thermal conductivity type:

Utilizing the difference in thermal conductivity between hydrogen and air (hydrogen has much higher thermal conductivity than air): When the mixed gas flows through the sensor, the heat dissipation rate of the heating element changes with the concentration of hydrogen, resulting in changes in temperature and resistance. The concentration is calculated by measuring the difference in resistance.

3. Electrochemical method:

Hydrogen gas undergoes an oxidation reaction with the electrolyte inside the sensor, generating an electric current that is proportional to the concentration of hydrogen gas. The structure includes a working electrode, a counter electrode, and a reference electrode, which output concentration values through stable electrochemical signals.

4. Semiconductor type:

When hydrogen gas comes into contact with semiconductor materials (such as tin dioxide), the material's resistance changes (reducing gas reduces resistance), and the concentration is sensed through the change in resistance.

Operating standards:

1. Avoid using in environments with high concentrations of corrosive gases such as chlorine and hydrogen sulfide to prevent sensor poisoning;

2. Keep the air inlet of the instrument unobstructed and away from heat sources during testing (catalytic combustion sensors are temperature sensitive);

3. When portable devices are not used for a long time, they need to be charged and stored (with a battery level of at least 50%) to avoid battery depletion.