Pro CO2 Alarm Analyzer w/ Relay in Waterproof Box

This version of the Nuvair Pro CO2 alarm analyzer comes equipped with a SPDT relay and mounted in a weatherproof box. Two custom audible and visual alarms for low and high carbon dioxide set points. 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 (10 A @ 250 VAC | 10 amp @ 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
  • Optional relays for external alarm or compressor control
  • Fast response
  • Specifically designed to test breathing gases
  • Easy to operate, reliable and accurate
  • Modulated infrared light source = No moving parts


Maximum Gas Flow Rate 0.5-1 L/min (<0.035 CFM)
Display Accuracy ±0.5%
Sensor Type Non-dispersive infrared
Resolution 0-2500 (50 ppm) CO2
Range 0-2000 ppm CO2
Response Time 90% in <60 seconds
Operating Temperature 41-104°F (5-40°C)
Will work outside this range with decreased accuracy
Storage Temperature 14-140° F (-10 to 60°C)
Operating Humidity 15-90% continuous, 0-99% intermittent
Power Rechargeable lithium battery, wall plug-in, or DIN power
Dimensions (LxWxD) 9 x 8 x 4.5 in (22.8 x 20.3 x 11.4 cm)

* 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.

PLEASE NOTE: Never expose gas sensors to pressure or you may cause damage and/or false readings. Damaged sensors will not provide accurate gas analysis. Inaccurate gas analysis can lead to serious personal injury or death. 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.