Dräger Tube Hydrogen Sulfide 2%/a (10)PN: 8101211 Dräger-Tubes™ are used together with a Dräger tube pump for measurements of gases, vapors and aerosols, usually in air, and are one of the classic methods of gas analysis. This Dräger-Tube is used for the detection of hydrogen sulfide and has the following standard measuring range: 2-40 Vol% Measurements: 10 Application Range Standard Measuring Range: 2 to 40 vol. % Number of Strokes n: 1 Time for Measurement: approx. 1 min Standard Deviation: ± 5 to 10 % Color Change: pale blue ä black Ambient Operating Conditions Temperature: 0 to 40 °C Absolute Humidity: 3 to 20 mg H2O / L Reaction Principle H2S Cu2 ä CuS 2 H Cross Sensitivity No interference by: 5,000 ppm sulfur dioxide 1,000 ppm hydrochloric acid 1,000 ppm ethyl mercaptan