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Proceeding with an abundance of caution is most certainly the preferred approach when making vibration or pressure measurements with cryogenic liquefied gases that have boiling points below -150 °C (-238 °F). These liquids can be inert (nitrogen, helium, neon, argon, krypton) or flammable (hydrogen, methane, natural gas). Oxygen is a special case as some non-combustible materials will burn in the presence of liquefied oxygen. Typical hazards include burns, adhesion of skin to materials, asphyxiation, rapid pressure changes, explosions and flammability.

PCB Piezotronics and Endevco have a two-part approach to cryogenic accelerometer design. The first is to use self-powered, piezoelectric sensor technology with expanded temperature ranges (-492 °F/-269 °C) and external charge amplifiers for signal conditioning. The second approach is to embed specially designed internal ICP® amplifiers inside the housing.

In this session, you will learn vibration and pressure measurement methods including:

• The limitations of sensors designed for cold temperatures
• How to select the correct sensor for cryogenic applications
• Which sensor performance parameters are affected by cold