Multigas Quality Monitoring System
Gas Guardian
Engineered for safety-critical applications, the NARDI Gas Guardian is a next-generation multigas quality monitoring system designed for compressed breathing air environments. From dive operations and fire stations to industrial and confined-space systems, the Gas Guardian provides precise, real-time air quality assurance that meets or exceeds global standards. Available in Pacific compressor-integrated, portable, and fixed versions.
Standard Equipment
Built for Demanding Environments
The Gas Guardian sensor enclosure is constructed from anodized aluminum and stainless steel. Choose from three versions that make the Gas Guardian ideal for both permanent installations and field use:
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Integrated
Factory-installed in Pacific high-pressure compressor
12-volt power supply -
Portable
Mounted in a rugged water-resistant carrying case
100–240V / 50–60 Hz power supply -
Fixed
Wall-mounted display panel allows for aftermarket installations
100–240V / 50–60 Hz power supply
Key Features
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Inlet pressure up to 420 bar (6100 psi)
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Compact housing with modular sensor configuration
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Touchscreen interface with visual readouts and diagnostic data
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IoT-enabled for remote monitoring, data logging, and traceable performance records
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Customizable alerts and alarms, including compressor shutdown safety protocols
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Simple sensor calibration using supplied sample gas cylinders
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Optional sensors for additional gases, including helium
Smart Monitoring = Safer Operations
Gas Guardian continuously analyzes critical gas parameters:
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Carbon Monoxide (CO): 0–1000 ppm, alarm threshold: 5 ppm
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Carbon Dioxide (CO₂): 0–10,000 ppm, alarm threshold: 500 ppm
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Oxygen (O₂): 0–100%, with alarm configuration
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Volatile Organic Compounds (VOCs - Oil Vapor): 0–40 ppm
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Hydrogen Sulfide (H₂S): 0–100 ppm
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Water Vapor (Dew Point): +20°C to -75°C (+68°F to -103°F) ADP
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Helium (optional): 0–100%
The analyzer performs pressure stabilization at 725 psi (50 bar) for accurate sensor readings and validates flow conditions at 2 L/min to ensure sensor precision.
Standards Compliance
Calibrated to EN 12021, the most stringent international standard for breathable air, Gas Guardian also supports compliance with:
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CGA G-7.1 (Grade E) and NFPA 1989 (USA)
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CSA Z180.1 (Canada)
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AS/NZS 2299.1 / 1715 (Australia & New Zealand)
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JIS T 8155 (Japan)
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GB/T 31975 (China)
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IS 15879 / 10245 (India)
User-adjustable alarm thresholds allow customization to match local or site-specific standards.
Maintenance & Calibration
Routine calibration is fast and operator friendly. The system supports autonomous recalibration for O₂ and dew point, with other gases calibrated using supplied sample gas cylinders:
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Mixed gases for CO, CO₂, VOC
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Dedicated cylinders for O₂ and H₂S
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Flow rate: 2 L/min for accurate zero/span calibration
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Sensor lifespan ranges from 2 to 10 years depending on the gas type
Technical Specifications
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Maximum inlet pressure: 420 bar (6100 psi)
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Operating temperature: +5°C to +45°C (+41°F to 113°F)
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Storage temperature: -10°C to +45°C (+14°F to 113°F)
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Operating humidity: 0–80% RH
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Altitude limit: 2000 m (6562 ft)
