Which of the following flow meters is most suitable for measuring the flow rate of gas streams?
A. Positive displacement flow meter
B. Thermal flow meter
C. Coriolis flow meter
D. Ultrasonic flow meter
Answer:B
Which of the following flow meters is most suitable for measuring the flow rate of gas streams?
A. Positive displacement flow meter B. Thermal flow meter C. Coriolis flow meter D. Ultrasonic flow meter
Explanation: Thermal flow meters are most suitable for measuring the flow rate of gas streams. They work based on the principle that the rate of heat transfer from a heated element to the flowing fluid is proportional to the mass flow rate. The heated element can be a thermistor, RTD, or a thin-film heater. Positive displacement, Coriolis, and Ultrasonic flow meters are better suited for measuring the flow rate of liquids.