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Smart Sensor ST8904 Portable 4-in-1 Multi Gas Detector O2 H2S CO LEL Monitor

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Smart Sensor ST8904 Portable 4-in-1 Multi Gas Detector – Handheld Personal O2, H2S, CO & Combustible Gas Monitor with Backlit Screen & Triple Hazard Alarms

The Smart Sensor ST8904 is a professional-grade personal safety instrument engineered to simultaneously measure four critical atmospheric hazards: Oxygen (O2), Hydrogen Sulfide (H2S), Carbon Monoxide (CO), and Combustible Gases (% LEL). Driven by a fast-responding electrochemical sensor core with a 2-year operational lifespan, this handheld monitor provides constant, life-saving protection in high-risk industrial environments. Featuring four distinct measurement modalities—including real-time tracking, peak holds, TWA, and STEL—it acts as an essential safeguard for personnel in confined spaces and hazardous utility zones.

Key Features:

  • Comprehensive 4-in-1 Gas Tracking: Simultaneously monitors Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), and Combustible Gases (% LEL) in real-time.
  • Advanced Safety Exposure Modes: Fully equipped to track standard real-time metrics alongside Peak data, Time-Weighted Average (TWA for 8-hour shifts), and Short-Term Exposure Limits (STEL for 15-minute bursts).
  • Triple Hazard Alert System: Combines intensive acoustic sound pitches, ultra-bright flashing LED lights, and physical tactile vibrations to ensure warning recognition in loud industrial zones.
  • Large Backlit Segment LCD: Displays all four gas concentrations simultaneously on a high-contrast screen that is easy to read in dimly lit spaces or heavy outdoor sunlight.
  • Rechargeable Battery Architecture: Power-packed with an internal high-capacity lithium battery core to sustain continuous personal field monitoring during long work shifts.
  • Rugged & Ergonomic Pocket Frame: Small, lightweight, and engineered with simple button controls for single-handed deployment and attachment to safety harnesses.
  • Type Gas Detector
Rs. 15,000.00 incl. taxes
In stock
In stock
Ready to work out of the box!

All our meters are delivered with essential accessories and easy-to-follow instructional manual. Unbox and start measuring with confidence!

Warranty and returns?

All our meters come with 12 month warranty against manufacturing defects. Please read our returns and refund policy for more information.

Got Questions? Feel free to get in touch.

Product Overview

Ensure uncompromised toxic safety compliance, handle industrial pre-entry checks, and prevent catastrophic atmospheric accidents with the Smart Sensor ST8904 Multi-Gas Detector. Hazardous gas leakages, toxic build-ups, and sudden oxygen displacements represent silent threats in industrial settings. The ST8904 eliminates this danger by deploying an interconnected sensor array that delivers continuous data processing with a rapid reaction window of under 50 seconds.

Complete with automatic power-off saving parameters, low battery warning status lights, and a robust physical chassis, this instrument is a vital tool for sewage infrastructure workers, petrochemical operators, industrial refinery auditors, and emergency responder crews.

Technical Specifications Matrix

Gas Classification Mode Targeted Measurement Range Sensing Principle Core
Oxygen (O2) 0% to 30% VOL

Electrochemical Principle (2-Year Cell Lifespan)

Carbon Monoxide (CO) 0 to 999 PPM

Electrochemical Principle (2-Year Cell Lifespan)

Hydrogen Sulfide (H2S) 0 to 500 PPM

Electrochemical Principle (2-Year Cell Lifespan)

Combustible Gas (% LEL) 0% to 100% LEL

Catalytic / Combustible Gas Core Array

General System Hardware & Operational Performance

  • System Native Accuracy: Plus or minus 0.1%

  • Reading Resolution Scale: 0.1 / 1 (Gas specific dependent)

  • Sensing Response Window (T90): Less than 50 Seconds

  • Safety Tracking Sub-Modes: 4 Modes (Standard Measuring, Peak Hold, TWA Analysis, STEL Tracking)

  • Alarm Indicator Output: High-decibel Sound Buzzer, Flashing Warning Light, and Tactile Vibration

  • Display Interface Properties: Large Segment Digital Display Panel with High-Contrast Backlight

  • System Power Core Unit: High-Output Inbuilt Rechargeable Lithium Battery

  • Power Management Utilities: Low Battery Indication and Automated Auto Power-Off functionality

  • Environmental Working Space: Temperature: 0°C to 50°C | Relative Humidity: Less than 90% RH

  • Physical Housing Outer Scale: 75mm x 138mm x 43mm

  • Net Instrument Mass Weight: Approximately 400 grams

Targeted Industrial & Field Applications

  • Confined Space Entry Auditing: Run rapid, comprehensive safety testing in deep underground utility vaults, storage tanks, and pipelines before crews enter.

  • Refinery & Petrochemical Safety: Protect single technicians working around pipeline valves, gas processing tracks, and storage terminals against sudden H2S or CO exposure.

  • Wastewater Treatment Plants: Provide continuous personal monitoring against explosive methane levels and fatal hydrogen sulfide accumulations near open digestion pools.

Package Contents

  • 1 x Smart Sensor ST8904 Multi-Gas Detector Main Unit

  • 1 x Integrated Battery Power Charging Link Cable

  • 1 x English User Operations Manual

  • 1 x Heavy-Duty Protective Retail Packaging Box