4-in-1 gas sensors module (also called multi-gas detectors) are typically used to detect multiple common toxic, flammable or hazardous gases at the same time. The specific combination of the four gases detected may vary depending on the application scenario, but the most common configuration includes the following gases:

1. Combustible gas (methane/propane, etc.)

    Usually detects methane (CH₄) or other combustible gases (such as propane, hydrogen, etc.), using catalytic combustion or infrared sensor principles to measure the lower explosion limit (LEL) concentration.

2. Oxygen (O₂)

    Detects the oxygen concentration in the environment (normal value is 20.9%), used to judge the oxygen-deficient (<19.5%) or oxygen-rich (>23.5%) environment to prevent suffocation or combustion risks.

3. Carbon monoxide (CO)

    A colorless and odorless highly toxic gas, commonly found in places with incomplete combustion (such as garages and kitchens), and high concentrations can be fatal.

4. Hydrogen sulfide (H₂S)

    Toxic gas, commonly found in industries such as sewage treatment and petrochemicals, with a strong rotten egg smell at low concentrations and rapid lethality at high concentrations.

TZHCO-01B gas sensor module

Other possible combinations

   Depending on the needs of different industries, the 4-in-1 sensor may also replace or add other gases, such as:

    Carbon dioxide (CO₂) (replace H₂S or CO)

    Sulfur dioxide (SO₂) (industrial applications)

    Volatile organic compounds (VOCs)

Notes:

    Confirm the sensor type: When purchasing or using, you need to know the type of gas the sensor is for (e.g., different scenarios for industrial and household use).

    Range and unit: Different gases have different measurement units and alarm thresholds (e.g., ppm, %LEL, %VOL).

    Regular calibration: Ensure detection accuracy.

If you have any questions about gas detection solutions, please feel free to contact us and our professional engineers will give you a satisfactory answer:

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