Application and Selection of 4-in-1 Gas Detectors in Industrial Safety

The 4-in-1 gas detector is a core safety device in industrial environments, monitoring four hazardous gases simultaneously. It is essential for oil and gas, mining, and confined space operations.

Gas Types Detected by the 4-in-1 Detector

Standard 4-in-1 configurations typically detect the following four gases:

Combustible Gas (LEL): Detects the lower explosive limit concentration of combustible gases such as methane, propane, and hydrogen. Alarm thresholds are typically set at 10% LEL (low alarm) and 25% LEL (high alarm).

Oxygen (O2): Monitors oxygen concentration in the environment. Low-oxygen alarm threshold: 19.5% VOL; High-oxygen alarm threshold: 23.5% VOL.

Carbon Monoxide (CO): Detects colorless, odorless toxic gas. Alarm thresholds are typically set at 25 ppm (low) and 50 ppm (high).

Hydrogen Sulfide (H2S): Detects this toxic gas, commonly found in oil extraction and wastewater treatment. Alarm thresholds are typically set at 10 ppm (low) and 15 ppm (high).

## Sensor Technology Comparison

Catalytic combustion sensor: Used for combustible gas detection. Low cost and fast response, but susceptible to poisoning by silicon compounds. Typical lifespan is 2-3 years.

Electrochemical Sensors: Used for CO, H2S, and O2 detection with high accuracy and selectivity. Typical lifespan is 2-3 years; regular calibration required.

Infrared Sensor: Used for combustible gas detection. Offers high resistance to poisoning and a lifespan exceeding 5 years, but at a higher cost.

## Typical Use Cases

Confined Space Entry: Before entering tanks, pipelines, or basements, a gas detector must be used. Leixin Electronic Technology (Baiantu)'s GD-300 4-in-1 gas detector features pump-assisted sampling, allowing remote gas monitoring of confined spaces from the outside.

Petroleum and Chemical Inspection: Wear a portable four-gas detector during daily inspections to monitor ambient gas concentrations in real time.

Emergency Response: Fire and safety agencies use a 4-in-1 gas detector at accident scenes to assess hazardous area gas concentrations.

Selection Recommendations

Diffusion vs. Pump-Aspiration: Diffusion is ideal for open environments, while pump-aspiration suits remote detection in confined spaces.

Explosion-proof certification: Select models with explosion-proof certification (e.g., ATEX, IECEx) for petrochemical applications.

Data Logging: Choose models with data logging capabilities for enhanced safety management and incident traceability.

Leixin Electronic Technology offers two series of four-in-one gas detectors: diffusion-based and pump-suction-based. Both feature explosion-proof certification and data logging capabilities. Contact us for selection recommendations.