Pro CO2 Alarm Analyzer w/ Relay in Waterproof Box


This version of the Nuvair Pro CO2 alarm analyzer comes mounted in a weatherproof box. Two audible and visual alarms for low and high carbon dioxide content can be set by the user. The included SPDT relay cable (10A @ 230VAC/30VDC ampacity) can connect to auxiliary equipment to trigger external alarms, emergency backup systems, or compressor shutdown. Verify stored gas cylinder contents, monitor an enclosed space or connect to a compressor for continuous analysis.


The Nuvair Pro CO2 alarm analyzer with relay in waterproof box measures carbon dioxide levels in all breathing gas mixes and is designed to verify CO2 concentration in stored gas cylinders, monitor an enclosed space, or analyze continuous flow gas from a compressor. Mounted in a weatherproof box, the analyzer is moisture and impact resistant and is compatible with outdoor and marine environments. This unit is equipped with a loud piezo alarm, an alarm light, and an SPDT relay (10A @ 230VAC/30 VDC) to control compressors or other accessories.

Two audible and visual alarms for low and high carbon dioxide content can be set by the user. If the alarm sounds, the analog output can activate an optional relay that shuts down compressors automatically, sounds remote alarms, or activates emergency backup systems.


  • On/off switch
  • Low battery warning indicator
  • 50 ppm CO2 resolution on digital display
  • Included SPDT relay (10A @ 230VAC/30VDC ampacity) for optional external control
  • Fast response
  • Specifically designed to test breathing gases
  • Easy to operate, reliable and accurate
  • Modulated infrared light source = No moving parts


Flow Rate 0.6-1 L/min
Resolution 50 ppm resolution from 0 to 1000 ppm, then 100 ppm up to full scale
Repeatability ± 2% of full scale @ 68°F (20°C) ambient
Linearity At ambient temperature and pressure:  ± 2% FSD or ± 10% of the reading, whichever is greater
Sensor Type NDIR (Non-dispersive infrared)
Expected Sensor Life 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 0-2000 ppm
Alarms Two user-programmable audible and visual alarms
SPDT Relay Ampacity 10A @ 230VAC/30VDC
Response Time < 30 seconds @ 68°F (20°C) ambient
Operating & Storage Temperature -4° to +122°F (-20° to +50°C)
Operating Humidity 0 to 95% rh, non-condensing
Power 1150mAh rechargeable lithium battery with charger
Battery Life Estimated 20 hours on a single lithium battery recharge
Warranty 12 months

* All specifications are at ambient/sea level, 77°F (25°C) and are subject to change without notice.
Calibration must be confirmed with a calibration CO2 test gas.

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.