Instruments airborne contaminant measurement

ISA S71.04. 1986. Environmental Conditions for Process Measurement and Control Systems Airborne Contaminants. Instrument Society of America, Research Triangle Park, N.C. [Pg.151]

With particles, the contaminant concentration in the duct is determined by isokinetic sampling with subsequent laboratory analysis use of a calibrated direct reading instrument. If the concentration distribution in the duct is uneven, a complete survey of the concentration distribution with the corresponding duct velocities and cross-sectional area is required. National and ISO standards provide information on isokinetic sampling and velocity measurements. In the case of particles, the airborne emission differs from the total emission, for example in the case of granular particulate. The contaminant settling on surfaces depends on particle distribution, airflow rates, direction in the space, electrical properties of the surfaces and the material, and the amount of moisture or grease in the environment. [Pg.1018]

Area monitoring may include measurements of radiation dose rates, airborne activities and surface contamination. In the controlled areas, fixed continuously operating instruments with local alarm and unambiguous readout should be installed to give information on the radiation dose rates. Any such instruments shall have ranges adequate to cover the expected levels. [Pg.22]