Final Answer:
The correct types of meters among the given options are A) Diaphragm (bellows) meter and D) Ultrasonic meter.
Step-by-step explanation:
Diaphragm (bellows) meters and ultrasonic meters represent distinct technologies used for measuring different types of fluids. Diaphragm meters function by employing flexible diaphragms to measure the volume of gas passing through them. They operate based on the principle of displacement, where the movement of the diaphragm measures the volume of gas. (A)
On the other hand, ultrasonic meters utilize ultrasonic waves to measure the flow rate of fluids, particularly in applications involving liquids. They work on the principle of the Doppler effect or transit time, where the speed of the fluid affects the time taken for ultrasonic waves to travel between sensors.(D)
Diaphragm meters calculate the volume of gas by measuring the displacement of the diaphragm caused by the flow. This displacement is then converted into volume measurements, often in cubic meters or cubic feet, depending on the specific system and units used. Ultrasonic meters, however, measure flow rates by analyzing the time it takes for ultrasonic waves to travel between sensors. This time, in conjunction with other factors like the speed of sound in the fluid medium, helps calculate the flow rate, typically in gallons per minute (GPM) or cubic meters per hour (m³/hr).
In conclusion, the diaphragm meter operates through mechanical displacement, while the ultrasonic meter relies on the principles of wave transmission. Each technology caters to different fluid measurement requirements, with diaphragm meters being prevalent in gas measurement and ultrasonic meters finding applications in liquid flow measurement across various industries.