What is the principle of operation for ultrasonic-level transmitters?
A. Conductivity
B. Capacitance
C. Radar
D. Sound waves
Answer:D
What is the principle of operation for ultrasonic-level transmitters?
A. Conductivity B. Capacitance C. Radar D. Sound waves
Explanation: Ultrasonic level transmitters work on the principle of measuring the time it takes for an ultrasonic sound wave to travel from the sensor to the liquid and back.