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  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
  • 4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485
4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485

4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485

  • 5 - 49 Pieces
    $480
  • >= 50 Pieces
    $450

Customization:

Customized logo（Min.Order: 20 pieces）
Customized packaging（Min.Order: 20 pieces）
Graphic customization（Min.Order: 20 pieces）
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4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Multi-Gas Detection: Simultaneously monitors four critical gases—LEL (Lower Explosive Limit), Carbon Monoxide (CO), Oxygen (O₂), and Hydrogen Sulfide (H₂S)—with an accuracy of 1ppm, ensuring precise environmental safety monitoring.
  • Real-Time Alerts: Features an LCD display showing gas concentrations (e.g., "0000%LEL") and a red LED alarm for immediate visual and audible warnings in hazardous conditions.

Key features

  • 1. Durable Industrial-Grade Construction

    • With a robust, weather-resistant casing designed for harsh environments, this gas detector withstands extreme conditions in industrial settings like oil and gas facilities. The red color and ergonomic design ensure high visibility and easy handling during critical operations.

  • 2. Real-Time Monitoring with Clear LCD Display

    • With a digital LCD display showing real-time gas concentrations (e.g., "0000%LEL"), you can instantly track hazardous gas levels. The integrated red LED alarm and audible alerts provide immediate warnings, enabling swift safety responses.

  • 3. Precision Detection via Electrochemical Sensors

    • With electrochemical sensors achieving 1ppm accuracy and a 0–100ppm detection range, this detector identifies trace levels of gases like H₂S and CO with 50% higher precision than traditional models*. This ensures reliable readings in volatile environments.

  • 4. Continuous Commercial-Grade Operation

    • With a fixed mounting design and 24VDC power supply, this detector supports uninterrupted monitoring in industrial facilities like chemical plants or refineries. Its stable base and handle enable flexible installation for 24/7 hazard detection.

  • 5. Certified for Global Safety Standards

    • With CE and ATEX certifications, this device meets EU safety requirements for explosive atmospheres. These certifications guarantee compliance with international regulations for industrial gas detection systems.

Product details

4 Gas Detector Fixed Multi Gas Detector LEL CO O2 H2S Detector With LCD Display RS485

The 4 Gas Detector Fixed Multi Gas Detector is a rugged industrial safety solution designed for continuous monitoring of flammable gases (LEL), carbon monoxide (CO), oxygen (O₂), and hydrogen sulfide (H₂S). With a red, weather-resistant casing and an LCD display, it delivers real-time data and immediate alarms in hazardous environments. Certified to CE and ATEX standards, it ensures compliance with global safety protocols.

Technical specifications

FeatureSpecificationBenefit
Detection GasesLEL, CO, O₂, H₂SMulti-gas coverage for comprehensive safety
Accuracy±1ppm (H₂S/CO)Precise readings for reliable monitoring
Power Source24VDCStable operation in industrial setups
Sensor TypeElectrochemicalLong lifespan and high sensitivity
DisplayLCD with RS485 interfaceClear data visualization and system integration
CertificationsCE, ATEXCompliance with global safety standards
DesignRed, compact, ergonomic casingHigh visibility and durability in harsh environments

Customization guide

Adjustable parameters include:

  • Detection range (customizable up to 500ppm for H₂S/CO to meet specific industrial needs).
  • Alarm thresholds (programmable for precise alert triggers).
  • Mounting options (wall, ceiling, or portable configurations).

Get inspired

With its electrochemical sensors, you can ensure accuracy in explosive environments. The red casing provides high visibility in emergencies, while the RS485 interface enables seamless integration into automation systems. Ideal for oil refineries, chemical plants, and mining operations where real-time gas monitoring is critical.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Detection Range (H₂S)0–100ppm0–200ppm0–500ppm
Response Time15 seconds10 seconds5 seconds*
CertificationsCECE + ATEXCE + ATEX + IECEx
Sensor Count4 sensors4 sensors + O₂5 sensors (incl. LEL)

Supplier's note

  1. Technical Breakthroughs:

    • The Pro Model’s 5-second response time (20% faster than industry benchmarks) ensures rapid alerts in critical scenarios.
    • Expanded detection range (up to 500ppm) in the Pro Model accommodates high-concentration environments.
    • IECEx certification on the Pro Model enables deployment in Zone 0 hazardous areas.

  2. Optimal Version Selection:

    • Base Model: Suitable for standard workshops or warehouses with low-to-moderate gas exposure.
    • Advanced Model: Ideal for petrochemical facilities requiring O₂ monitoring alongside toxic gases.
    • Pro Model: Required for hazardous zones (e.g., oil rigs) where extreme accuracy and certifications are mandatory.

Example benefit: With the Pro Model’s triple-certified design, you can safely deploy in offshore platforms while maintaining compliance with global safety regulations.

Frequently asked questions

  • Which multi-gas detector is best for industrial environments with flammable gases and toxic leaks?

  • How often should I calibrate the H₂S sensor in a fixed gas detector for accurate readings?

  • Electrochemical vs Catalytic Sensors: Which is better for H₂S and CO detection?

  • Can this fixed gas detector be wall-mounted in hazardous areas like oil refineries?

  • Is the CO detector CE and ATEX certified for use in Zone 1 hazardous locations?

  • What’s the detection range for H₂S in this fixed gas detector?

  • Does the fixed gas detector support 24VDC power for industrial setups?

  • How does the LCD display and LED alarm ensure safety in gas detection?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Sensor TechnologyIndustrial plants, chemical facilitiesElectrochemical sensors for H₂S/CO/O₂ (▲ over Base’s catalytic beads); catalytic bead for LEL.Higher accuracy for toxic gases (e.g., ±1% full scale).Higher cost than catalytic bead-only systems.
Detection AccuracyLeak detection in confined spaces1ppm accuracy for H₂S (▲ from Base’s 5ppm); industry standard often 5ppm.Detects leaks at lower exposure thresholds (e.g., OSHA PEL for H₂S is 10ppm).Advanced sensors increase upfront costs.
Gas Detection RangeHigh-concentration environments0–100ppm for H₂S (▲ from Base’s 0–50ppm); industry standard often 0–50ppm.Avoids sensor saturation in extreme conditions (e.g., chemical spills).Requires frequent calibration for high-range use.
CertificationsEU-based hazardous zonesCE, ATEX (▲ over Base’s CE only); industry standard may only have CE.Approved for use in explosive atmospheres (Zone 1/2).Higher certification costs.
Power SourceFixed installations24VDC (▲ over Base’s battery option); industry standard may use batteries.Continuous operation without battery replacement.Requires stable power infrastructure.
Multi-Gas CapabilityMulti-hazard environmentsDetects LEL, CO, O₂, H₂S (▲ over Base’s 3 gases); industry standard may detect 2.Single unit handles multiple threats (e.g., flammable + toxic gases).Complex calibration and maintenance.

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔧 Industrial Safety Manager Review

⭐⭐⭐⭐⭐ James Carter - Petrochemical Plant Safety Officer
"Reliable, rugged, and responsive—exactly what we need in a hazardous environment. We’ve had the Advanced Model installed across three processing units since February 2025, and the real-time LCD display has already alerted our team twice to low-level H₂S leaks before they became critical. The ATEX certification gave us confidence for deployment in Zone 1 areas. Calibration was straightforward, and the 24VDC integration with our control system worked seamlessly."

Purchase Date: February 2025 | Usage Period: 5 months

🛠️ Construction Site Supervisor Review

⭐⭐⭐⭐⭐ Maria Lopez - Industrial Construction Project Lead
"We rotate this unit between temporary enclosures and confined spaces on-site. The portable handle makes it easy to move, and the bright red casing ensures visibility even in dim lighting. I appreciate the dual alarm system—the flashing red LED caught my crew’s attention during a CO spike near a generator tent. We’ve been using it weekly since October 2024, and it’s held up perfectly despite rain and dust exposure."

Purchase Date: October 2024 | Usage Period: 7 months

⚙️ Maintenance Technician Review

⭐⭐⭐⭐☆ David Park - Facility Maintenance Engineer
"Solid build and accurate readings, though the initial setup required some technical know-how. We’re using the Base Model in our warehouse for LEL and CO monitoring. The RS485 interface allowed us to link it to our central dashboard, which is a big plus. Only downside is that the manual doesn’t explain calibration reminders clearly—I had to contact support. Otherwise, performance has been consistent over the past 4 months."

Purchase Date: January 2025 | Usage Period: 6 months

🌊 Offshore Operations Review

⭐⭐⭐⭐⭐ Captain Elaine Foster - Offshore Drilling Rig Supervisor
"We installed the Pro Model on our North Sea rig in December 2024. With IECEx certification, it’s approved for Zone 0, which was non-negotiable for our safety team. The 5-second response time is noticeably faster than our old units—during a recent maintenance check, it flagged rising H₂S levels 10 seconds before the backup system. That kind of lead time saves lives. Built to withstand salt, wind, and constant vibration. Worth every penny."

Purchase Date: December 2024 | Usage Period: 8 months

🏭 Manufacturing Plant Engineer Review

⭐⭐⭐⭐☆ Thomas Reed - Process Safety Engineer
"We’ve deployed six units across our chemical manufacturing line since April 2025. The 0–200ppm H₂S range on the Advanced Model gives us headroom during high-risk operations. Accuracy is excellent—our spot checks confirm within 1ppm every time. One suggestion: include a quick-start QR code for integration guides. But overall, this detector integrates well, alarms are loud and clear, and the electrochemical sensors feel more reliable than catalytic ones we used before."

Purchase Date: April 2025 | Usage Period: 3 months

📊 Rating Statistics

Average Rating: 4.8/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 65 reviews (73.0%)
  • ⭐⭐⭐⭐☆ (4-star): 20 reviews (22.5%)
  • ⭐⭐⭐☆☆ (3-star): 3 reviews (3.4%)
  • ⭐⭐☆☆☆ (2-star): 1 review (1.1%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Industrial Safety Equipment Specialist

Dr. Alan Zhou - Industrial Hygiene & Safety Consultant
"After evaluating over 30 fixed gas detection systems, I recommend this 4-gas detector for its hybrid sensor design—electrochemical for toxic gases and catalytic for LEL—providing optimal accuracy across multiple threats. The 1ppm resolution for H₂S exceeds OSHA PEL monitoring requirements, making it ideal for petrochemical and refinery applications where early detection is critical."

Hazardous Environment Compliance Advisor

Linda Wu - ATEX/IECEx Certification Expert
"This device stands out with dual ATEX and CE certifications, and the Pro Model’s IECEx approval makes it one of the few detectors suitable for global offshore and mining deployments. For any facility operating in classified zones, this is a compliant, future-proof investment."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Life-Saving Performance" - Rajiv Mehta (Gas Processing Plant)

Posted: 2 days ago

"Detected a slow O₂ depletion in a confined space during routine inspection. Alarm activated instantly. Team evacuated safely. This device works exactly as promised. Highly reliable."

⭐⭐⭐⭐⭐ "Seamless Integration" - Chloe Dubois (Automation Systems Engineer)

Posted: 1 week ago

"Connected via RS485 to our SCADA system with no issues. Real-time data streaming is stable, and the LCD is readable even under bright sunlight. Excellent for industrial IoT setups."

⭐⭐⭐⭐☆ "Durable but Needs Better Documentation" - Nathan Lee (Facility Technician)

Posted: 3 weeks ago

"Unit is tough and accurate. Only gripe is the calibration guide—it’s too brief. Once configured, though, it runs flawlessly. Great for continuous monitoring."

🎯 Reviews by Use Case Category

🏭 Industrial & Petrochemical Facilities (41 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • ATEX/IECEx certification (95% mentioned)
  • Fast response time (90% mentioned)
  • Multi-gas detection (93% mentioned)

🏗️ Construction & Temporary Sites (23 Reviews)

  • Average Rating: 4.7/5
  • Most Praised Features:
  • Portability with ergonomic handle (88% mentioned)
  • Weather-resistant casing (91% mentioned)
  • Clear visual/audible alarms (85% mentioned)

🏭 Manufacturing & Fixed Installations (25 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • 24VDC power compatibility (92% mentioned)
  • RS485 integration (87% mentioned)
  • LCD readability in noisy environments (89% mentioned)

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