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The following document is relevant to a select number of Picarro instruments which allow users to employ a surrogate gas validation (SGV) procedure in place of a direct calibration on the primary gas species. This document is applicable to the following analyzers:

• G2103 - Ammonia (NH₃)
• SI2103 - Ammonia (NH₃)
• G2108 - Hydrogen Chloride (HCl)
• G2114 - Hydrogen Peroxide (H₂O₂)
• G2205 - Hydrogen Fluoride (HF)
• SI2205 - Hydrogen Fluoride (HF)
• G2307 - Formaldehyde (H₂CO, HCHO, or CH₂O)