Which of the following is NOT a type of level measurement transmitter?

• A. Temperature transmitter
• B. Float
• C. Ultrasonic
• D. Laser

Answer: (A)

Level measurement transmitters determine how full a vessel is by sensing the surface and turning that into a signal. A float device uses a buoyant element tied to a sensor that rises and falls with the liquid level, providing a level measurement. Ultrasonic systems send sound waves to the surface and compute level from the reflected signal’s travel time. Laser-based systems perform a similar distance-measurement using light to infer the surface height. A temperature transmitter, on the other hand, is designed to measure temperature and convert that into a process signal; it does not sense liquid level. Because of that, it is not a type of level measurement transmitter.