| MESA Specialty
Gases offers three types of product grade available for your calibration
gas standard, Primary, Certified and Gravimetric Standards.
The Primary Standard is the most accurate and is made by weight. Unless stated otherwise, the specialty gas mixture is certified to ± 1% analytical accuracy of the numbers reported. The Certified Standard is made by a combination of pressure and/or weight measurements. Unless stated otherwise, the calibration gas mixture is certified to ± 2% analytical accuracy of the numbers reported. In the case of all specialty gas products, final calibration gas mixtures are analyzed by gas chromatography or other suitable analytical methodology to confirm they are within the allowed tolerances. All calibration gas mixtures are supplied with a "Certificate of Analysis" that details the requested and analytical values as well as preparative and analytical methods used by MESA Specialty Gases to prepare the calibration gas standard. |
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STANDARD SPECIFICATIONS FOR CALIBRATION GAS, SPECIALTY GAS, NATURAL GAS, PETROCHEMICAL AND REFINERY GAS STANDARDS |
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Product Grade |
Concentration Range |
Blend Tolerance (1) |
Certification Accuracy (1) |
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Primary |
Below 5ppm (2) |
± 10 to 15% |
± 1 to 2% |
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5 to 100 ppm |
± 5% |
± 1% |
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101 to 5000 ppm |
± 5% |
± 1% |
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Above 0.5% |
± 2% |
± 1% (1) |
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Certified |
Below 5ppm (2) |
± 15 to 20% |
± 2 to 5% |
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5 to 100 ppm |
± 10% |
± 2% |
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101 to 5000 ppm |
± 10% |
± 2% |
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Above 0.5% |
± 5% |
± 2% |
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Gravimetric (3) |
Below 5ppm(2) |
± 20% |
Non-Certified by independent laboratory analysis. Concentration Ranges are reported based on the gravimetric values. |
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101 to 5000 ppm |
± 10% |
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Above 0.5% |
± 5% |
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