Pro Trimix Alarm Analyzer


Used by technical divers for multigas analysis, the Nuvair Pro Trimix Alarm measures helium (He) and oxygen (O2) levels in mixed gases. Self-calibrating with audible and visual alarms. With an optional relay, the Pro Trimix Alarm can shut down a compressor at user-defined set points.


The Nuvair Pro Trimix Alarm is a multigas analyzer that measures helium (He) and oxygen (O2) levels in either mixed breathing gases stored in gas cylinders or from compressor's continuous gas flow. The analyzer is compatible with outdoor and marine environments, is self-calibrating and includes user-defined audible and visual set point alarms. If the alarm sounds, the analog output can activate an optional relay to shut down equipment automatically, sound a remote alarm, or activates an emergency backup system. Range: 0-100% with display accuracy of ±2%.

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.


  • On/Off switch
  • Display range of 0.0-100%
  • Two (2) custom audible and visual alarms for each gas
  • 4-20 mA analog output for external devices
  • Capable of shutting down compressor at set alarm with optional relay cable


  • Made to test breathing gases
  • Fast response
  • Easy to operate, reliable and accurate
  • Long-life electrochemical oxygen sensor
  • Automatic calibration
  • Long-life thermal conductive helium sensor


Sensors Pro He Pro O2
Flow Rate 0.5-1 L/min 0.5-2 L/min
Resolution 0.1% 0.1%
Linearity / Repeatability Linearity: ±2% over full scale Repeatability: ±1 % volume O2 @ 100% O2, applied for 5 min
Accuracy ±2% over full scale Within ±1% of full scale at constant temperature and pressure (0-1 atm) when calibrated with 100% oxygen
Sensor Type Thermal conductive Electrochemical
Expected Sensor Life Up to 10 years under normal conditions 36 months in air at 25°C/77°F and 50% rh
Range 0.0-100.0% helium in air or nitrogen or oxygen 0-100% oxygen (max), 0-1% oxygen (min)
Response Time <10 seconds for 90% response <6 seconds for 90% of final value
Alarms (2) User-programmable audible and visual alarms (2) User-programmable audible and visual alarms
Operating Temperature 41-104°F (5-40°C) 32-104°F (0-40°C)
Storage Temperature 5-122°F (15 to 50°C) 32-122°F (0-50°C)
Operating Humidity 0-90% rh (non-condensing) 0-99% rh (non-condensing)
Power 800mAh Rechargeable lithium battery with 110/220V charger
(L x W x H)
3.9 x 8.7 x 7.5 in
(9.9 x 22.1 x 19.1 cm)
Weight 2.75 lb (1.25 kg)