A laboratory nitrogen generator is a machine that is able to separate nitrogen molecules from the air around it by using a compressed air source. By removing the vast majority of oxygen molecules and other impurities from an air source, these machines are able to produce high purity or ultra-high purity nitrogen gas needed to run a variety of different laboratory applications and instruments.

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There are many applications that require a lab to use a nitrogen gas generator, with LC-MS, GC, ICP, ELSD, and sample preparation/blowdown evaporation being the most common. Each application will have specific nitrogen requirements (flow rate, purity level, etc.) which will determine the exact type of N2 generator needed by the lab.

Application

Flow Rate

Purity Level

 LC-MS

 High (30 to 40 L/min)

 Moderate to high (~97-99%)

 GC

 Low (under 1 L/min)

 Ultra-high (>99.999%)

 ICP

 Low to Moderate (<5 L/min)

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 Ultra-high (>99.999%)

 ELSD

 Low to Moderate (<5 L/min)

 High (~98-99%)

Sample Prep/Blowdown Evaporation

Moderate to High (5 to 40 L/min)

Low to Moderate (<98%)

N2 gas generators aren't the only way labs are able to obtain nitrogen. Let's get into some other common sources, and discuss when they may be a better fit.