Stability and shelf life of calibration test gases in aluminium cylinders


Maintaining calibration test gas stability and purity in portable aluminium cylinders has long been a challenge, and the difficulty has escalated in recent years due not only to increasingly stringent regulatory requirements around the world, but also because of growing demand for ultra-high purity (UHP) gases.

Only a few years ago, allowable contaminants in such gases were generally measured in parts-per-million (ppm). Today, parts-per-billion (ppb) and even parts-per-trillion requirements are not uncommon.

Calibration test gases are used to test and calibrate environmental sensors and instruments in facilities in which potentially dangerous toxic, combustible, explosive or polluting gases are used. Designed to protect workers from hazardous gas leaks and undetected hazards, these detection devices must be properly maintained and periodically tested and calibrated, and gases used to test them must be thoroughly analysed and certified in terms of composition and purity. In addition, test gases must remain stable and uncontaminated to work correctly. Otherwise, test equipment might fail to detect faulty sensors, which could result in dangerous concentrations of harmful gases.

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