Nuvair Pro Duo O2/CO2 Alarm Analyzer | 9618-LB


The Nuvair Pro O2 / CO2 multigas alarm analyzer detects levels of oxygen (O2, in percentage) and carbon dioxide (CO2, in parts per million) in ambient air and compressed (stored) or continuous flow (compressor output) gases. Independent LCD gas readouts. User-definable alarms for each gas. Mounted in a waterproof hard case.


The Nuvair Pro O2 / CO2 multigas alarm analyzer is mounted in a rugged, water-resistant case. Each sensor has two user-programmable audible and visual alarms. The internal sensors are plumbed together to monitor a single input. The analyzer has visual and optional audible alarms for each gas.

An audible alarm sounds if any alarm set point is reached. When in alarm, the analyzer's analog output can activate an optional relay that shuts down compressors automatically, sounds a remote alarm, or activates emergency backup systems. Comes equipped with a rechargeable lithium-ion battery and universal 110/230-volt charger.

WARNING: Never expose gas sensors to pressure or you may cause damage and/or false readings. Damaged sensors will not provide accurate gas analysis. Most gas analyzers can be used to analyze a regulated gas sample flow, the contents of a gas cylinder, or the flow from a regulator. The flow rate of gas must equal 1-5 L/min. To produce this flow, a Flow Restrictor and Regulator may be required. A faulty Flow Restrictor can lead to a false analyzer reading. Flow Restrictors should be regularly tested with a Flow Meter. Inaccurate gas analysis can lead to serious personal injury or death.


  • Monitors oxygen and carbon dioxide levels to ensure compliance with breathing air standards for CGA, NFPA, OSHA, CSA, EN norms, and others.
  • Oxygen reading in any mix in the range 0.0–100.0% of volume
  • Carbon dioxide reading in parts per million (ppm)
  • Two (2) custom audible and visual alarms for each gas
  • Oxygen sensor life up to 36 months
  • User-replaceable oxygen sensor
  • Carbon dioxide sensor life up to 10 years
  • Robust waterproof hard case
  • Automatic calibration of O2 and CO2 sensors

Replacement Sensor

Multigas Analyzer Specifications

Alarms Two user-programmable audible and visual alarms
Power Rechargeable lithium battery with 110/230V charger
Operating Temperature 32–104°F (0–40°C)
Storage Temperature 32–122°F (0–50°C)
Operating Humidity 0–95% rh (non-condensing)
Power Rechargeable lithium battery or 110/220 V wall plug-in
(L x W x H)
3.6 x 8.8 x 7.5 in
(9.3 x 22.5 x 19 cm)
Weight 4 lb (0.95 kg)

Sensor Specifications

Sensor Pro O2 Pro CO2
Flow Rate 0.5–2 L/min 0.6–1 L/min
Resolution ±0.1% 50 ppm resolution from 0 to 1000 ppm, then 100 ppm up to full scale
Repeatability N/A ±2% of full scale @ 68°F (20°C) ambient
Linearity N/A At ambient temperature and pressure: ± 2% FSD or ± 10% of the reading, whichever is greater
Accuracy Within ±1% of full scale at constant temperature and pressure (0-1 atm) when calibrated with 100% oxygen ±2% over full scale
Sensor Type Electrochemical Non-dispersive infrared (NDIR)
Expected Sensor Life Up to 36 months in air at 25°C/77°F and 50% rh 5-10 years based on analyzer handling and use. Check sensor accuracy frequently with test gas and attempt to recalibrate if reading is inaccurate. Replace sensor if recalibration fails.
Range 0–100% oxygen (max), 0–1% oxygen (min) 0–2000 ppm