i-Propanol 50/a (10) Cross Sensitivity The tube does not differentiate between different alcohols. During the measurement of n-Propanol with n=10 strokes, the concentration read must be multiplied by a factor of 3.5. Methanol is indicated approximately with double sensitivity, Ethanol with similar sensitivity and Tetrahydrofuran with half sensitivity. Higher molecular alcohols are indicated with significantly decreasing sensitivity. &le, 100 ppm formaldehyde, &le, 250 ppm acetaldehyde, &le, 200 ppm toluene, &le, 200 ppm xylene,&le, 100 ppm diethyl ether and &le, 1000 ppm dimethyl ether are not indicated. Aliphatic petroleum hydrocarbons, ketones, esters, halogenated hydrocarbons and benzene are also not indicated. This Tube will replace Alcohol 25/a (8101631)