STAGE ONE
KEY MEASUREMENTS
Impurities
Installed after the compressor , a SERVOPRO FID analyzer using Flame Ionization Detector technology will monitor the total hydrocarbon ( THC ) levels down to parts-per-billion ( ppb ) levels . This ensures the THC is maintained below flammable limits .
A FID also monitors THC after the molecular sieve absorber stage , to check that the hydrocarbons have been removed from the air to within required purity specifications .
The AquaXact 1688 moisture sensor can also be installed at these locations , monitoring H 2 O content in the air before and after cooling . These unique sensors also can be used to control the regeneration process for molecular sieve absorber beds .
A SERVOPRO Chroma provides a versatile , Gas Chromatography-based solution to the monitoring of other impurities , to ensure filtration of the air has been effective prior to cooling .
There is also a requirement to measure CO 2 as an impurity . To accomplish this , a SERVOPRO MultiExact 4100 , configured with a Gas Filter Correlation sensor , is installed after the molecular sieve absorber .
These measurements provide insight into the effectiveness of the removal of CO 2 , THC , and H 2 O from the air as it is filtered , compressed , and cooled , monitoring the quality of the air before the distillation process begins .
COMPRESSOR
FILTER AIR
P09