Vacuum Volumetric Measurement (Manometry)

Abstract

Many types of static volumetric vacuum adsorption apparatus have been developed [e.g., 1–7] and no doubt every laboratory where serious adsorption measurements are made has equipment with certain unique features. The number of variations is limited only by the need and ingenuity of the users. However, all volumetric adsorption systems have certain essential features, including a vacuum pump, one or more gas supplies, a sample container, a calibrated manometer, and a coolant. Fig.14.1a describes a historical set-up using an Hg-volume manometer instead of a pressure transducer; the volumes Va, Vb, and Vc correspond to the calibrated reference volume in Fig. 14.1b, which refers to a simplified, modern static volumetric sorption apparatus.