ASTM F649-01 PDF

Scope: 1.1 This practice covers procedures for adjusting the size ranges of an airborne discrete particle counter (DPC) to match size/concentration data from a reference DPC that has been calibrated for counting and sizing accuracy in accordance with Practice F 328 and is kept in good working order. The practice is applied in situations where time, capabilities, or both, required for carrying out procedures in Practice F 328 are not available. It is particularly useful where more than one DPC may be required to observe an environment where the particulate material being counted and sized is different in composition from the precision spherical particulate materials used for calibration in Practice F 328 and/or all of the DPCs in use are not similar in optical or electronic design. 1.2 Procedures covered here include those to measure sampled and observed air volume or flow rate, zero count level, particle sizing and counting accuracy, particle sizing resolution, particle counting efficiency, and particle concentration limit.

ASTM F649-01 Referenced Document

ASTM E20
ASTM F328 Standard Practice for Calibration of an Airborne Particle Counter Using Monodisperse Spherical Particles

1970 ASTM F649-01 Standard Practice for Secondary Calibration of Airborne Particle Counter Using Comparison Procedures
2001 ASTM F649-80(1999) Standard Practice for Secondary Calibration of Airborne Particle Counter Using Comparison Procedures