RAE QRAE II General Information

The RAE Systems QRAE II is a full-featured, rugged yet compact, one- to four-sensor gas detector with a powerful built-in sampling pump. It is designed to provide continuous exposure monitoring of oxygen, hydrogen sulfide, carbon monoxide, and combustible gases for workers in hazardous environments. Standard features include easy-to-change battery packs, easy access to sensors, internal vibrating alarm, loud 95dB audible alarm, and a water-resistant IP65 case design. The rechargeable Lithium-ion battery delivers up to 14 hours of continuous operation in diffusion mode (a spare alkaline battery adapter is included for 10 hour back-up operation). RAE Systems' patented, CO2 tolerant SPOE O2 sensor delivers a longer lifespan boasting an RoHS compliant lead-free and leak-free design. The QRAE II sports the capability to record data that can be downloaded to a PC. The AutoRAE Lite automatic calibration station for QRAE II enables fast and easy bump testing and calibration of the monitor, streamlines the data download process, and saves calibration gas to deliver the lowest cost of ownership on the market. The RAE Systems QRAE II is available as a meter only (including standard accessories) or as part of a confined space kit. The confined space kit includes the meter (with standard accessories) as well as:

  • Four-gas mix in a cylinder: 50% LEL, 18% O2, 10 ppm Hydrogen Sulfide, 50 ppm Carbon Monoxide (p/n: 600-0050-007)
  • Regulator and tubing
  • Calibration gas cylinder


  • 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

QRAE II calibration guide

Want to calibrate the RAE Systems QRAE II? Here's how:

  1. Turn the RAE Systems QRAE II on in normal reading mode. Do this by pressing and holding the power button on the left.
  2. Give the monitor a five minutes to warm up the sensors. To enter calibration mode, press and hold the top left and top right buttons for 5 seconds.
  3. If you gave the monitor a password, enter it here. Press the yes button on the right to continue. The next screen will ask if you want to calibrate it; press the yes button again to accept. Make sure you are in a fresh air environment and press the yes button one more time to start the fresh air calibration.
  4. Open the valve on your (1 lpm) regulator. This is a very important step so you do not ruin your calibration gas cylinder. Now screw it in to your calibration gas cylinder. Close the regulator once you hear gas spewing out of it. This is the signal to know your regulator is good to close. Continue screwing in the regulator until it stops. Do not overturn it.
  5. Attach the tubing to the hose barb on your regulator. Make sure the tubing is also connected to your calibration adapter.
  6. Once the monitor is done with the fresh air calibration, it will ask if you want to multiple sensor calibration. Accept by pressing the yes button. Press the yes button again to start calibration.
  7. Screw the calibration adapter onto the monitor and open the regulator to allow gas to flow.
  8. Make sure your calibration gas values on the screen match what is on your calibration gas cylinder!
  9. Close and unscrew the regulator then unscrew and detach the calibration adapter from the monitor. Press the left power button until "back" is selected and press the yes button on the right. Do this one more time to get back to normal reading mode.
  10. Congratulations! You have officially calibrated your RAE Systems QRAE II gas monitor. Make sure to record these readings in your calibration log!