Environmental Monitoring Equipment & Supplies • Sales, Rental & Service by Enviro-Equipment — Charlotte, North Carolina USA

RAE Systems QRAE II Four Gas Meter


  • Provides monitoring of Oxygen (O2), Combustibles (LEL), Carbon Monoxide (CO) and Hydrogen Sulfide (H2S).
  • Available in Diffusion or Pumped version.
  • Audible, visible, and vibration configurable alarms.
  • Easy access to pump, sensors, filter and battery compartment.
  • Datalogging capable, stores up to 12 days at one-minute intervals.

***This Item Has Been Discontinued***
Parts and sensors are still available for purchase (see Parts tab below).

This item is no longer available.

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

Key features of this 4 gas monitor 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 your PC.

Patented SPE O 2 ™ Oxygen sensor unique features:

Lead-free design that already complies with future RoHS Standard, Extended life compared to lead-type electrochemical oxygen sensors resulting in low cost of ownership, and Leak-free design, minimizing downtime


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, IP-65 Water- and dust-resistant case, Strong, protective concussion-proof design





0 to 30%


Combustible Gas

0 to 100% LEL

1% LEL

Carbon Monoxide

0 to 1000 ppm

1 ppm

Hydrogen Sulfide

0 to 100 ppm

0.1 ppm


  • 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)


  • Diffusion: 9 oz (250 g)
  • Pump: 12 oz (350 g)


Interchangeable Lithium-ion

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


Two-button operation

Direct Readout

  • Instant reading from up to four sensors
  • Oxygen as percentage by volume
  • Combustible gas as percentage of lower explosive limit (LEL), scalable using correction factors
  • Toxic gases in parts per million
  • High and low values for all gases
  • Battery and shutdown voltage
  • Date, time, elapsed time, temperature


  • 95dB buzzer (at 30 cm, typical), vibration alarm, 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
  • Pump stall alarm


Highly resistant to EMI/RFI. Compliant with EMC directive 2004/108/EC additional +60 volts/meter

IP Rating



Standard 12 days at one-minute intervals


Two-point calibration for zero and span

Sampling Pump

internal pump 300 cc/min (Optional)

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


-4° to 122° F (-20° to 50° C) for T4 temperature code


0% to 95% relative humidity (non-condensing)


Stainless-steel alligator clip


Full 2-year warranty, including sensors