Automated manometric apparatus

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Abstract
A manometric system has been developed for automatically performing hydrogenations, autoxidations and similar gas‐liquid phase reactions. Incorporation of an ion chamber permits radio‐active isotope experiments. Nonradioactive isotopes (such as deuterium and O18) are monitored by attaching the apparatus to a mass spectrometer. Automatic recording of gas volume and radioactivity establishes a permanent record and allows unattended operation. Use of a servomotor‐driven syringe eliminates all mercury, including mercury leveling bulbs. The flow‐through construction of the syringe permits circulation of the gas phase and, as required in isotopic experiments, obviates the dead space inherent in classical manometers. Basic electronics and readily available components enhance operation and construction. Typical hydrogenations with accompanying graphs showing gas uptake, reaction time and radioactivity concn illustrate the utility of the apparatus and the ease of collecting data.

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