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The QRAE II is a full-featured, compact, one- to four-sensor gas detector for detection of combustibles, oxygen, hydrogen sulfide, and carbon monoxide.

Key features include easy-to-change, externally accessed battery packs (available in rechargeable and alkaline versions), sensors and filter, a water-resistant case and a new state-of-the-art O2 sensor technology with extended life.

The rechargeable Lithium-ion battery pack provides up to 14 hours of continuous operation. The QRAE II includes storage capacity for 64,000 datalogging points, which can be downloaded to any PC compatible with Windows 98, NT, 2000 or XP.

Features & Benefits

  • Patented SPE O2 Oxygen sensor unique features:
    1. Lead-Free Design that already complies wuth future RoHS Standard
    2. Extended life compared to lead-type electrochemical oxygen sensors resulting in low cost of ownership
    3. Leak free design, minimizing downtime
  • Best EMI/RFI immunity technology for products in its class, eliminating radio interference
  • Easy access to sensors, filter and battery compartment without exposing electronic components to potential damage
  • Big graphic display for easy overview of gas type and concentration
  • Alkaline adapter and rechargeable Lithium-ion battery pack provide up to 14 hours of continuous operation
  • Rugged housing withstands harsh environments
  • One to four plug-in sensors (combustibles, oxygen SPE O2™, hydrogen sulfide, carbon monoxide)
  • Diffusion mode, with optional manual sample pump
  • Intuitive simple-to-operate two-button user interface
  • Display can be flipped 180º with the push of a button for easy viewing from belt or hand
  • Multi-language support
  • One-button calibration with auto-zero capability
  • Loud 95dB audible alarm
  • Bright red flashing visible alarm
  • Vibration alarm
  • Interchangeable drop-in Lithium-ion and alkaline battery packs
  • Charging cradle doubles as an external battery charger
  • Compatible with AutoRAE calibration station
  • Optional Confined Space Entry Kit


  • 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

Product Specifications Description
Size 12.5 x 7.2 x 3.8cm
Weight 350g
Sensors Catalytic bead for combstibles
Oxygen: SPE O2 (non-consumable Solid Polymer Electrolyte technology)
Toxic: electrochemical CO, H2S
Battery Interchangeable Lithium-ion and alkaline bettery packs
Operating Periody Diffusion: Up to 14 hours continuous operation with Lithium-ion battery, up to 10 hours with alkaline battery (typical, without alarm)
Display Graphic 4 lines, with LED automatic back light in dim light or alarm condition
Keypad Two-key Operation
Direct Readout Instantaneous reading of up to four sensors
Oxygen as percentage by volume
Combustible gas as percentage of lower explosive limit (LEL), scaleable using correction factors
Toxic gases as parts per million by volume
High and low values for all gases
Battery and shutdown voltage
Date, time, elapsed time and tempreature
Alarms 95dB buzzer (at 30cm) and flashing red LED
High: 3 beeps and flashes per second
Low: 2 beeps and flashes per second
STEL and TWA: 1 beep, vibration and flash per second
Alarms latching with manual override or automatic reset
Additional diagnostic alarm and display message for low battery
Datalogging Standard 12 days at one-minute intervals
Calibration Two-point calibration for zero and span
Tempreature --20° to 50°C for T4 Tempreature code
--20° to 55°C for T3 Tempreature code for T3 Tempreature code
Humidity 0% to 95% relative humidity (non-condensing)
Attachments Stainless steel alligator clip
Warranty Full 2-year warranty, including all sensors