Standard gas production or manufacturing has become an essential service for a variety of industries. To ensure the correct gas is purchased, it is critical to understand the hierarchy of standard materials and how the production process ensures a consistent and accurate product. Without this understanding it is difficult for purchasing companies to identify and compare the best providers.
The standard gas hierarchy is typically separated into three fundamental tiers: Primary, Master, and Certified. Primary standard materials rely on either the primary measurement and analysis. With the development and implementation of additional assessment measurements, a facility can manufacture master standard gas. The increase in accuracy and stricter quality control are the differences between primary and master standard material production. The final option is certified standard materials which features an even higher level of accuracy and consistency. Functionally, the method of manufacturing and mixing accuracy is the key driver in determining the level of quality within the hierarchy.
Regardless of where the standard gas is on the hierarchy a similar manufacturing and analysis process is used. There are two phases which take place simultaneously. They are the gas mixing phase and cylinder preparation phase. In the gas mixing phase both the component gas and the base gas is inspected. Once they pass inspection, they are combined and refined to ensure they pass an impurity analysis. Assuming the impurity analysis is passed, the mixed gas is compressed and stored until the cylinder preparation phase is complete.
The cylinder preparation phase takes place simultaneously with the gas mixing phase. The new cylinder undergoes a physical inspection to ensure a clean and sanitary inner surface. If necessary, shot blasting and a comical inner surface treatment is undertaken to ensure nothing in the cylinder risks contaminating the standard gas mixture.
Once the standard gasses are mixed and the cylinder has been prepared the gas filling phase begins. This phase is often considered the most important because accuracy is essential for the producer to meet the exist specification of the purchaser. This phase is often what separate the best standard gas manufacturers from their competition. Relying on high precision balancing techniques the compressed gas fills the cylinder followed by the base gas. One both groups of gasses are in the cylinder the homogenization process begins. This process will vary based upon the types of gasses being combined.
The final process is calculations and analysis. The best standard gas providers include multiple layers of redundancies to ensure accuracy. After the gasses have been homogenized the contents of the cylinder must be verified using the appropriate analysis instrument for the gas mixture. Once the content is verified as accurate a report and any applicable certificates will be created.
With a basic understanding of standard gas analysis and production it is easier for a buyer to identify the best manufacturers to work with.