COSA Xentaur introduces one of the first commercially available portable Optical Gas Calorimeters. After extensive development work, this instrument proudes the fastest spot check response in the industry; T90=15 seconds for Natural Gas and LPG.


  • Gas Turbine Fuel Gas Optimizing
  • Gas Boiler Tuning
  • Appliance Performance
  • Natural Gas Well Spot Check
  • City Gas Spot Check


  • Model CV PRO™
  • Detection principle Interferometry
  • Measuring gas Natural Gas or NG + LPG *See Note
  • Measurement range 25-55 MJ/Nm3 (670-1475 BTU/cf)
  • 0-1V external output 40-50 MJ/Nm3 (1073-1341 BTU/cf)
  • Accuracy ±0.1 MJ/Nm3 (2.7 BTU/cf) *See Note
  • Repeatability ±0.03 MJ/Nm3 10°C @ 1Atmosphere (0.8 BTU/cf)
  • Response time ≤15 sec Time to 90% response
  • Drifting 0.22 MJ/Nm3 10°C @ 1Atmosphere (5.9 BTU/cf)
  • Sample flow rate ~0.2L/min
  • Sample pressure Atmospheric pressure to +15 kPa
  • Ambient temperature -10 to +40°C, 95%RH (non-condensing)
  • Power source C size alkaline battery x 4 or AC adaptor
  • Battery life Approximately 20 hours (continuous power on)
  • Internal Data Logging 100 measurements logged showing date/time/Calorific Value
  • PC external output Recorder output (RS-232C) by use of exclusive cable (optional)
  • Dimensions & weight 340(W) x 235(H) x 180(D) mm, approximately 5.5kg

Calibration gas of like composition to the stream gas being measured can be used to calibrate the CV PRO™ to reduce measurement bias when the stream gas composition contains appreciable amount of one or more of the constituents noted in the error by percent table. Typically the factory calibration of the CV PRO™ will be calibrated to meet the ±0.1 MJ/Nm3 (2.7 BTU/cf) accuracy statement.