This lesson describes the properties of fluids that are a factor in the measurement of their flow. In addition, the lesson explains how differential pressure measurements can be used to determine flow rate. Various types of flow measurement devices and their principles of operation are also discussed.

This lesson presents the basic principles of temperature measurement and the application of temperature measuring instruments. Various temperature-measuring instruments are discussed including thermometers, pyrometers, thermocouples, resistance temperature detectors, and thermistors.

This lesson describes the fundamentals of level measurement and the sensors employed. Applications for both direct and indirect level measurement are covered including float-type devices, hydrostatic head and differential pressure measurements, as well as electrical, ultrasonic, and radiation instruments.