Product Focus: Laboratory Gas Generators
For David Hemmig, director of equipment sales at Matheson Tri-Gas (Basking Ridge, NJ), the key word in on-site gas generation is reliability. He explains that a major problem with gas generators that incorporate some sort of compressor is that eventually that component fails.
Nitrogen and zero air generators, for example, often use compressors to bring air into the system. The zero air generator “fine tunes” the product by removing hydrocarbons. “But the compressor is the weak link,” Hemmig says.
For nitrogen generators, the compressor serves a similar purpose, but separating pure nitrogen from air (which is 78 percent nitrogen) is slightly more difficult. Membranes represent the established technology, while units from Air Products (Allentown, PA), for example, use pressure swing adsorption. Regardless, when the compressor fails, nitrogen generation ceases.
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