ABSTRACT
Flow measurement is basic to any sampling scheme. Flow measuring instruments are classified as primary, intermediate or secondary standards, depending on their accuracy and physical characteristics. This chapter discusses calibration of flow measuring devices, wet test meter, mass flow meter, rotameter, limiting orifice, and dry test meter and their introduction, procedure, and calibration data sheet. It aims: to calibrate a wet test meter using a water displacement technique, to calibrate a mass flow meter, to calibrate a rotameter in a bubbler train using a dry gas meter, and to construct a pump performance curve. The chapter also aims: to be able to describe how various factors affect orifice flow. These factors include: vacuum, upstream resistance, and directional placement of a common orifice.
