Bosean 4 In 1 Multi Gas Detector O2 H2S CO LEL Meter

Meet the Bosean 4 In 1 Multi Gas Detector BH-4A/BH-4AO2 — a compact, rugged, all-in-one gas monitor that helps you stay safe in challenging environments. Detect O2, CO, H2S, and combustible gases (LEL) with a single device that ships factory-calibrated and ready to use. Boasting a 2.4-inch HD display, adjustable alarms, and a sturdy ABS housing with anti-slip grip, this detector is built to perform in real-world industrial settings. It’s CE and FCC certified on the BH-4A model, reflecting Bosean’s commitment to quality. As the official Bosean factory store, we offer customization options to fit your specific safety needs.

Bosean was founded in 2013 to develop and manufacture gas detectors, gas analyzers, and rangefinders. Our products follow strict ISO9001, CE, ATEX, and ROHS quality standards, using world-class equipment and testing to ensure reliability. R&D and production capabilities support global deployment and ongoing service.

Main benefits

• Reliable 4-gas detection — monitors O2, CO, H2S, and LEL with factory-calibrated electrochemical sensors (made in the UK) for quick, accurate readings.
• Fast response & precise alarms — detection error ≤ ±5% F.S. with <30s response time; adjustable audio, visual, and vibration alerts with time-stamped logs.
• Rugged, portable design — high-strength ABS with anti-slip grip; waterproof and dust-proof with explosion-proof capability (Ex ib IIB T3 Gb) for demanding environments.

Benefits & Tips

• Use the 4-in-1 detector in confined spaces, welding areas, or chemical plants to continuously monitor O2 (0–30% vol), CO (0–999 ppm), H2S (0–100 ppm), and LEL (0–100% LEL).
• Take advantage of factory calibration for immediate use—perform zero and span calibrations as needed and rely on digital time-stamped alarm logs for post-incident analysis.
• Keep the device charged and stored in its protective case; follow recommended maintenance to preserve accuracy and extend battery life (6–8 hours typical).

Product specifications

• Gas types: Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Combustible Gas (LEL)
• Gas measurement ranges: O2 0–30% vol; CO 0–999 ppm; H2S 0–100 ppm; EX (LEL) 0–100% LEL
• Resolution: O2 0.1% vol; CO 1 ppm; H2S 1 ppm; LEL 1% LEL
• Alarms: Low/High alarm with adjustable thresholds; audible up to 80 dB; visual and vibrating alerts; alarm time stamping and logging
• Display: 2.4-inch HD display
• Power: Built-in 3.7V Li-battery; typical runtime 6–8 hours
• Weight & size: 400 g; 145 mm × 69 mm × 28 mm (L × W × H)
• Operating conditions: Temperature −20°C to 50°C (LEL 0–40°C); Humidity <95% RH (no dew)
• Certifications: CE, FCC; Ex ib IIB T3 Gb
• Sensor origin: Electrochemical sensors made in the UK
• Additional: 500 alarm records data storage; factory-calibrated; logs with time stamps
• Origin: Mainland China
• Model: BH-4A, BH-4A O2

Package includes:

• 1 x 4 in 1 multi gas monitor
• 1 x English User manual
• 1 x Charging adaptor
• 1 x USB charging cable
• 1 x Calibration cover
• 1 x Metal aluminum box
• 1 x Certificate

Warnings / Reminders

• Always follow local safety regulations when working with hazardous gases and ensure proper ventilation.
• Factory calibration is provided for immediate use; for long-term accuracy, schedule periodic zero and span calibrations as recommended.
• Operate within specified temperature and humidity ranges; do not expose the device to dew or immersion.
• Protect the unit from damage; use the included protective case during transport and storage.

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