Dräger-Tube Benzene 2/a (5)PN: 8101231 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 benzene and has the following standard measuring range: 2-60 ppm Measurements: 5 Application Range Standard Measuring Range 2 to 60 ppm Number of Strokes n 20 Time for Measurement approx. 8 min Standard Deviation ± 10 to 15% Color Change white to brown gray Ambient Operating Conditions Temperature 0 to 40 °C Absolute Humidity 1 to 15 mg H2O/L Cross Sensitivity Alkyl benzenes such as toluene or xylene up to a concentration of 00 ppm do not affect the indication. It is impossible to measure benzene in the presence of petroleum hydrocarbons and carbon monoxide