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ANALYTICAL TOLERANCES Two classes of calibration standards are available. PRIMARY and CERTIFIED STANDARDS. The PRIMARY STANDARD is the most accurate and is made by weight. Unless stated otherwise, the mixture is certified +/- 1% analytical of the numbers reported. The CERTIFIED STANDARD is made by a combination of pressure and/or weight. Unless stated otherwise, the mixture is certified +/- 2% analytical accuracy of the numbers reported. CYLINDER SIZES Calibration mixtures are available in three general types of cylinders. These cylinders are classed as follows:
Liquid mixtures in low-pressure cylinders are shipped with a helium or nitrogen pressure pad and dip tube in order to facilitate withdrawal of the liquid mixture. Accurate Gas Products, L.L.C. works closely with customers to ensure that the cylinder used for each mixture will meet all technical requirements for the application. The following is a listing of the most commonly requested cylinders:
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