A computer-controlled system for measuring ventilation rates in large buildings is described. The system consists of a data acquisition unit controlled by a personal computer, a gas Chromatograph equipped with a molecular sieve column, a scandium-tritide electron capture detector (ECD), a weather station, and a carbon dioxide analyzer. One of the unique features of this system is that it prevents oxygen from entering the ECD, thus reducing the minimum time between samples and considerably extending the life of the detector. The system is capable of monitoring up to 16 different locations, automatically calibrating itself, and displaying ventilation rates using the decay method at the end of the sampling period. The tracer gas is injected with a syringe in the heating, ventilating, and air-conditioning (HVAC) return air.
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