Nuvair Pro He/O2 Trimix Analyzer


The Nuvair Pro He/O2 trimix analyzer represents the most economical and contemporary model for the analysis of oxygen (O2) and helium (He) in mixed gas with nitrogen. For an added cost savings, only one screen is used to cycle between He and O2 readings. Available in two power models. Selected from 110/210V wall plug-in (9602-E) or rechargeable lithium battery with 110/230V charger (9602-LB).


The Nuvair Pro He/O2 multigas analyzer for trimix divers is mounted in a rugged, water-resistant case. Each sensor has two user-programmable audible and visual alarms.

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 (like the 400-100 Calibration Test Gas 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.


  • Helium reading in any oxygen-helium-nitrogen mix in the range 0.0-100.0% of volume
  • Oxygen reading in any oxygen-helium-nitrogen mix in the range 0.0-100.0% of volume
  • Two (2) custom audible and visual alarms for each gas
  • Thermal conductivity helium sensor developed for a marine sport environment
  • O2 sensor life up to 36 months
  • He sensor life up to 10 years under normal conditions
  • Robust waterproof hard case
  • Automatic calibration of O2 and He

Replacement Sensor


Sensor Pro O2 Pro He
Flow Rate 0.5-2 L/min 0.5-1 L/min
Resolution ±0.1% 0.1%
Repeatability / Linearity ±1% volume O2 @100% O2 applied for 5 min ±2% over full scale
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 Thermal Conductivity
Expected Sensor Life Up to 36 months in air at 25°C/77°F and 50% rh Up to 10 years
Range 0-100% oxygen (max), 0-1% oxygen (min) 0-100% helium in air, nitrogen or oxygen
Alarms Two user-programmable audible and visual alarms
Power Select from: 110/210V wall plug-in, or
Rechargeable lithium battery with 110/230V charger
Operating Temperature 32-104°F (0-40°C) 41 to 104°F (5 to 40°C)
Storage Temperature 32-122°F (0-50°C) 5 to 122°F (-15 to 50°C)
Operating Humidity 0-99% rh (non-condensing) 0-90% 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 2 lb (0.95 kg)