The NRL Air Resistance Meter, Model II

摘要

The resistance to airflow is one of the basic characteristics of aerosol filtration materials. With the relatively recent study and development of new low-resistance filters and canisters, there was a need for an improved air resistance meter. In response to this need, NRL designed a new air resistance meter which provides accuracy, versatility, and rapidity of measurement. It utilizes a system of three parallel air lines, each designed to accommodate a specific range of airflows and each with its own separate control valve. These serve to furnish a more accurately calibrated span of airflows up to 100 liters/minute. The instrument is mounted on a table making a convenient semiportable laboratory device. This device has a pneumatically operated chuck to hold the filter sample. The chuck provides uniformity and rapidity of operation and is designed to allow inserts and other alterations to be made easily. The new air resistance meter can be used in conjunction with other equipment to measure airflow resistance and aerosol penetration simultaneously. (Author)