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74 Operation and Maintenance Manual
Contaminated Gases
The use of clean gases for the 355 SCD is essential for optimal performance.
High purity gases (99.999% pure or better) are advised. Sulfur and other
contaminants from gases may accumulate in the column and bleed out over
time desensitizing the tubes and causing elevated baselines. The use of sulfur
traps is highly recommended for all gases.
Fluctuating Pressures
Fluctuations in pressure, especially from gas generators, will affect Detector
response. It is therefore recommended that only bottled gases equipped with a
dual stage regulator or appropriate steps to ensure stable pressure supplies
are used.