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The VM-3000 Mercury Vapor Monitor measures continuously the Hg concentration in air and other gases. Measuring principle:cold vapor atomic absorption (CVAAS) at 253.7 nm UV-Source:Electrodeless low pressure mercury lamp (EDL) Stabilization method:Reference beam method Optical cell:Fused silica (Suprasil), l: approx. 230mm, heated approx. 45° Sensitivity:0.1 μg/m³ Response time:< 1 sec