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How Calibration Gases are made
Calibration gases are typically made by blending high-purity gases in precise concentrations to produce a gas mixture with a known composition. The specific process for making calibration gases can vary depending on the type of gas and the intended use of the gas mixture.Here is a general overview of the steps involved in making a calibration gas mixture:
1. Select the high-purity gases: The first step in making a calibration gas is to select the high-purity gases that will be used as the building blocks for the gas mixture. These gases are typically obtained from gas suppliers and are purified to remove any impurities that could affect the accuracy of the final gas mixture.2. Determine the desired concentration: The next step is to determine the desired concentration of each gas in the mixture. This is typically done by referring to a gas standard or a calibration curve that specifies the appropriate concentrations for a given application.3. Blend the gases: Once the desired concentrations have been determined, the high-purity gases are blended together using a calibrated gas blender. The blender is programmed to precisely control the flow rates of each gas to ensure that the final gas mixture has the desired composition.4. Verify the composition: After the gas mixture has been blended, it is analyzed to verify that it has the desired composition. This is typically done using gas chromatography or another analytical technique that can measure the concentration of each gas in the mixture.5. Label and package the gas mixture: Finally, the gas mixture is labeled with its composition and other relevant information, such as the date of manufacture and the expiration date. The gas mixture is then packaged in a cylinder or other container suitable for its intended use.Overall, the process of making calibration gases requires careful attention to detail and strict quality control to ensure that the gas mixture has the desired composition and accuracy.