Measure CO with confidence

Whether for process control or quality control, gas suppliers need accurate, low-level contaminant monitoring to ensure gas quality with no impurities. For refineries and chemical plants it is especially critical to measure carbon monoxide in hydrogen since high levels can poison a customer’s process and a supplier’s reputation. CO is also a critical impurity in fuel-cell-grade hydrogen that can poison the fuel cell’s catalyst.

Monitor purity with the HALO 3 CO analyzer, designed to provide unparalleled accuracy and reliability for your most critical carbon monoxide measurements. Compact and easy to use, this analyzer features Tiger Optics’ proven Cavity Ring-Down Spectroscopy to detect carbon monoxide as low as 40 ppb in your gas.

Users enjoy freedom from periodic sensor maintenance, and with no calibration gases required, operating costs are nearly eliminated. With drift-free stability and rapid response time, the HALO 3 CO is ideal for the continuous, online gas monitoring that is critical to process control in gas and chemical industries or anywhere purity is a necessity.



  • CEM Standards Preparation
  • Gas Quality Control
  • Gaseous CRMs & Calibration Gas Mixtures
  • High-Purity Gases & Systems
  • Hydrogen Fuel Cells
  • Research & Development
  • Syngas & Fuel Gas Production


Detection and Matrix Range LDL (3σ) Precision (1σ) @ zero
CO in N2 0 – 2000 ppm 40 ppb 15 ppb
CO in O2 0 – 1800 ppm 35 ppb 12 ppb
CO in Clean Dry Air (CDA) 0 – 2000 ppm 40 ppb 15 ppb
CO in Ar 0 – 1600 ppm 30 ppb 10 ppb
CO in He 0 – 1800 ppm 35 ppb 12 ppb
CO in H2 0 – 2500 ppm 50 ppb 20 ppb


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