Which type of level gauge works on the principle of optical reflection?
A. Sight glass level gauge
B. Float level gauge
C. Guided wave radar level gauge
D. Reflex level gauge
Answer:D
Which type of level gauge works on the principle of optical reflection?
A. Sight glass level gauge B. Float level gauge C. Guided wave radar level gauge D. Reflex level gauge
Explanation: Reflex level gauges work on the principle of optical reflection. They use a prism to reflect light off the liquid surface, and the amount of light reflected back is used to determine the level of the liquid.