Calibration Standard Gases Are Key to Reliable Measurements (click on the title to read the complete article)
Acurate, repeatable measurements are possible only when an analytical instrument is calibrated properly.
The calibration gas standard establishes a known analyzer response to a certified chemical component concentration. This enables sample responses to be converted
to a concentration whose accuracy can be determined. This article offers an in-depth review of how calibration standard gases are manufactured, certified, and properly
Accuracy is defined as the agreement of a measured value with its true value. Common synonyms for accuracy are analytical accuracy, analytical uncertainty, and certification accuracy. All calibration standard gases should have a certified component concentration, along with an expression of the accuracy of the certified value. Analytical accuracy is a statistically derived value. The generally accepted formulae for calculating accuracy are published in International Standard Organization (ISO)
and U.S. institute papers. Basically, accuracy is calculated using a propagation of error model, commonly referred to as the square root of the sum of the squares of the
common error factors.