The QRAE II is a full-featured, compact, one- to four-sensor gas detector for oxygen, combustibles, hydrogen sulfide, carbon monoxide or sulfur dioxide. Key features include easy-to-change battery pack, a water-resistant case and a new state-of-the-art O2 sensor.

  • Best EMI/RFI immunity technology for products in its class, eliminating radio interference
  • Easy access to pump, sensors, filter and battery compartment without exposing electronic components to potential damage
  • IP-65 water- and dust-resistant case
  • Strong, protective, concussion-proof design


Sensor Specifications (Default)

Gas Monitor Range Resolution
Oxygen 0 to 30.0% 0.1%
Combustible 0 to 100% LEL 1% LEL
Carbon Monoxide 0 to 1000 ppm 1 ppm
Hydrogen Sulfide 0 to 100 ppm 0.1 ppm
Sulfur Dioxide 0.1 to 100 ppm 0.1 ppm

*Consult RAE Systems for custom configurations

Detector Specifications

Size Diffusion: 5" L x 2.8" W x 1.5" H (12.5cm x 7.2cm x 3.8cm)
Pump: 5" L x 2.8" W x 2" H (12.5cm x 7.2cm x 5.0cm)
Weight Diffusion: 9 oz (250 g)
Pump: 12 oz (350 g)
  • Catalytic bead for combustibles
  • Oxygen: SPE O2™ (non-consumable Solid Polymer Electrolyte technology)
  • Toxic: electrochemical, H2S, CO or SO2
Battery Interchangeable Lithium-ion and alkaline battery packs
Operating Period Diffusion: Up to 14 hours continuous operation with Lithium-ion battery, up to 10 hours with alkaline battery (typical, without alarm)
Pump: Up to 10 hours with Lithium-ion battery, up to 8 hours with alkaline battery
Display Graphic 4 lines, with LED automatic back light in dim light or alarm condition
Keypad Two-key operation
Direct Readout
  • Instant 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
  • High and low values for all gases
  • Battery and shutdown voltage
  • Date, time, elapsed time, temperature
  • 95dB buzzer (at 30 cm) and flashing red LED
  • High: 3 beeps, vibration and flashes per second
  • Low: 2 beeps, vibration 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
EMI/RFI Highly resistant to EMI/RFI. Compliant with EMC directive 2004/108/EC additional +60 volts/meter
IP Rating IP-65
Datalogging Standard 12 days at one-minute intervals
Calibration Two-point calibration for zero and span (manual, or automatic with the AutoRAE Lite)
Sampling Pump Optional, internal pump 300 cc/mn
Hazardous Area Approval
  • US and Canada: CI, D1, Groups A, B, C, D, T4
  • Europe: ATEX II 2G EEx ia d IIc T4
  • IECEX: Ex ia d II C T4
Temperature -4° to 113° F (-20° to 50° C) for T4 temperature code
Humidity 0% to 95% relative humidity (non-condensing)
Attachment Stainless-steel alligator clip
Warranty Full 2-year warranty, including all sensors

*Specifications are subject to change


  • Oil & Gas
  • HazMat
  • Industrial Safety
  • Environmental

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