Please Note: The current Round Robin experiment will close on 2024-06-30.

The following table includes information on the set of high-pressure cylinders for the WMO/IAEA Round Robin Experiment currently underway. Cylinder information and results from previous Round Robin experiments may be found here.

The fields are described as ...

• [RR #] - Current WMO Round Robin number.
• [Circuit #] - The circuit number in which the listed cylinder is being circulated.
• [ID] - Serial Number imprinted on the listed cylinder.
• [Category] - Each cylinder in each circuit has a [L]ow, [M]id, or [H]igh designation indicating the relative magnitude of the CO₂ mole fraction within the cylinder (H > M > L).
• [Fill Date] - Date on which the cylinder was filled.
• [Fill] - The location at which the cylinder was filled.
• [Fill Pressure] - The cylinder pressure (psig) immediately after filling.
• [Parameter] - Specifies the trace gas species for which the nominal value assigned to the RR cylinder and calibration scale are reported.
• [Nominal Value] - The nominal value (± a value that defines the nominal range) assigned to the RR cylinder. For example, 370 (5) ppm CO₂ means the assigned value is in the range 370 ± 5 ppm or 365-375 ppm CO₂.
• [Reported Scale] - The nominal value is reported relative to the specified WMO mole fraction calibration scale if one exists or equivalent. More information on calibration scales may be found here

Download Cylinder Information