National Oceanic and Atmospheric Administration (NOAA Boulder)
Methane (CH 4 ) WMO Scale
standardreference data / spectrumIndustry: Aerospace
- Category
- Data & Digital Tools
- Affiliations
- NOAA Boulder
Description
WMO X2004A calibration scale for methane, expanded to a nominal 300–5000 ppb range with a multi-point calibration strategy and updated historical calibrations; based on primary standards prepared in 1991–1995.
Official page
https://gml.noaa.gov/ccl/ch4_scale.html
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Contact
- Contact
- (no name)
Details
- Keywords
- methane scale, multi-point calibration, secondary standards, calibration uncertainty, primary standards
- Location
- Boulder, Colorado
- Standard id
- WMO X2004A
- Issuing body
- WMO; NOAA Global Monitoring Laboratory
- Associated entity
- NOAA Global Monitoring Laboratory
- Specifications
- *Uncertainties are 67% confidence intervals. | To institute the multi-point calibration strategy, 14 secondary standards were prepared by evacuating 29 L aluminum cylinders, then spiking them with zero air, or a gas mixture enriched in CH4, then…