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The QRAE Plus is a full-featured, compact, one-to-four sensor confined space gas detector. Its features include easy-to-change, externally accessed battery packs (available in both alkaline and rechargeable versions) and water-resistant case design.

The rechargeable, Lithium-ion battery pack provides up to 20 hours of continuous operation.

The QRAE Plus includes 16,000 datalogging points of storage capacity for download to PC compatible with Windows 98, NT, 2000, and XP.

Available Sensors Include:
  • %Vol/LEL
  • LEL Combustible Gas Sensor
  • H2S Hydrogen Sulphide sensor
  • CO Carbon Monoxide sensor
  • SO2 Sulphur Dioxide sensor
  • NO Nitric Oxide sensor
  • NO2 Nitrogen Disoide sensor
  • Cl2 Chlorine sensor
  • HCN Hydrogen Cyanide sensor
  • NH3 Ammonia sensor
  • PH3 Phosphine sensor

Features & Benefits

  • Rechargeable Lithium-ion battery pack provides up to 20 hours of continuous operation
  • Rugged housing withstands use in harsh environments
  • Highly resistant to radio frequency and other electromagnetic interference
  • Strong, built-in sample draw pump with optional collapsible sample probe
  • One-button calibration with auto-zero capability
  • Loud audible alarm
  • Bright visual alarm


  • Confined Space Entry
  • Waste water treatment plants
  • Marine and off-shore oil wells
  • Landfill operations
  • Trenches, silos, railcars
  • Coal mines
  • Cruise ships
  • Sewers and manholes
  • Tunnels
  • Refineries and petrochemical plants, including off-shore drilling and plant shut downs
  • Power plants
  • Pulp and paper industry
  • Steel mills

Technical Specifications

Gas SensorRangeResolution
Oxygen0 – 30%0.1%
Combustible0 – 100% LEL1% LEL
Carbon Monoxide0 – 500ppm1ppm
Hydrogen Sulfide0 – 100ppm1ppm
Sulfur Dioxide0 – 20ppm0.1ppm
Nitric Oxide0 – 250ppm1ppm
Nitrogen Dioxide0 – 20ppm0.1ppm
Chlorine0 – 10ppm0.1ppm
Hydrogen Cyanide0 – 100ppm1ppm
Ammonia0 – 50ppm1ppm
Phosphine0 - 5ppm0.1ppm