Blend tolerance is the difference between the certified concentration and the requested concentration for a given component. For example, if you order a gas mixture at a concentration of 100 ppm with a blend tolerance of 5%, then we must produce a product with a certified concentration between 95 and 105 ppm (i.e. (100-95) / 100 = 0.05, or 5% relative) to be in specification. Blend tolerance will vary by the component and concentration you order, and will also be dependent on the manufacturing method used to make the gas mixture.
Mixture Tolerances: All mixtures (excluding Ethanol) as follows All Ethanol mixtures:
1-2 ppm + 100% / -50% (relative) ± 5.21 ppm or ± 2% whichever is greater
2-20 ppm +/- 10% (relative) Note: All gas mixtures are manufactured using scales calibrated with
21-50 ppm ± 5% (relative) N.I.S.T. traceable weights.
51 ppm & above ± 2% (relative)