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Mixtures Specifications
Precision Plus
Mixtures are prepared gravimetrically using a high load, high sensitivity scale. Preparation tolerance is carefully controlled and the mixture is accurately analyzed to insure that the mixture concentrations are the same as the ordered percentage.
Precision
Mixtures are prepared gravimetrically using a high load, high sensitivity scale. They are analyzed to a high degree of accuracy with the preparation tolerance dependent on the minor component(s) concentration.
Certified
Mixtures are prepared using gravimetric or partial pressure methods. Preparation tolerance and analytical tolerance are controlled to a level appropriate for applications with less critical requirements.
Uncertified
Mixtures are produced using the same techniques as certified mixtures but are only guaranteed to conform to the preparation tolerances.
| Mixture Grade | Concentration
Range of Minor
Component(s) | Preparation Tolerance* | Certification Accuracy* | | Precision Plus | 0.5%to 30% | ±0.03%absolute | ±0.03%absolute | | Precision | 31%to 50% | ±1%of component | ±0.1%of component | | 1%to 30% | ±0.3%absolute | ±0.03%absolute | | 0.1%to 1% | ±5%of component | ±3%of component | | 50PPM to 1000 PPM | ±10%of component | ±3%of component* | | Certified | 31%to 50% | ±1%of component | ±0.5%of component | | 1%to 30% | ±0.3%absolute | ±0.1%absolute | | Uncertified | 26%to 50% | ±2%of component | NotApplicable | | 1%to 25% | ±0.5%absolute | NotApplicable |
Accuracy may vary for mixtures containing hydrogen or helium due to their low molecular weight.
*Preparation tolerances and certification accuracy may vary depending on the chemical characteristics of the minor component, and accuracy may vary for mixtures containing hydrogen or helium due to their low molecular weight. Contact Airgas Puritan Medical for information regarding your requirements.
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