What are the 4 gases in a gas detector?

A 4 in 1 gas detector is a multi-functional gas detection instrument that usually integrates sensors for four different types of gases and is used to monitor multiple gas concentrations in the environment at the same time. While the specific gases detected depend on the application, the four most common gases monitored by portable 4 gas detectors are:

1. O₂ (Oxygen)
Risks: Low O₂ (below 19.5%) can cause asphyxiation; high O₂ (above 23.5%) increases combustion risk.

2. CO (Carbon Monoxide)
Risks: Causes poisoning, headaches, or death at high concentrations.

3. H₂S (Hydrogen Sulfide)
Risks: Smells like rotten eggs at low levels but paralyzes the sense of smell at higher concentrations; fatal in high doses.

4. Combustible Gases (Methane - CH₄, Propane - C₃H₈, Butane - C4H10)
Purpose: Detects flammable gases to prevent explosions or fires.

BX616 Portable Multi-gas Detector

At Hanwei Electronics, we have been manufacturing high-end 4 gas detectors for years, These gas monitors play a critical role in protecting workers by detecting multiple gas (4 - 6 gases) hazards simultaneously. Can monitor additional gases beyond the primary four.

E4000 Portable Multi-gas Detector

Additional Common Gases(Depending on Industry): NH₃ (Ammonia)
Cl₂ (Chlorine)
NO (Nitric Oxide)
NO₂ (Nitrogen Dioxide)
SO₂ (Sulfur Dioxide)
CO₂ (Carbon Dioxide)

What Other Detector Types?

Single Gas Detectors

Single gas detectors are designed to detect one specific type of gas. These machines are designed to be compact and easy to use. They alert workers to the presence of particular gas concentrations that are dangerous and present.

Common applications include monitoring for toxic gases like carbon monoxide (CO), hydrogen sulfide (H2S), or oxygen deficiency in industrial settings, as well as for detecting combustible gases like methane (CH4) in confined spaces.

Fixed Gas Detectors

These fixed gas detectors are typically installed in industrial or commercial settings where continuous monitoring is essential. They’re often found in petroleum and petrochemical industries, chemical plants, metallurgical industries, power plants, and large commercial buildings. Fixed detectors offer constant monitoring and can cover larger areas.

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