Journal
FLOW MEASUREMENT AND INSTRUMENTATION
Volume 89, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.flowmeasinst.2022.102295
Keywords
Ultrasonic sensor; Level measurement; Contact; Non-contact measurement; Fiber bragg gating; Radar level gauge
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Depending on different applications, the process control industry uses liquid-level sensors based on different principles. However, due to the dynamic nature and characteristics of liquid and storage tanks, accurate measurement is difficult. This paper reviews the liquid level measuring instruments used in the past 11 years, discussing both contact and non-contact measurement techniques. From the study, it is clear that ultrasonic sensors are widely used for high accuracy liquid level measurement, despite the echo issue in tanks.
Depending on various applications, the process control industry uses liquid-level sensors of different principles. Due to the dynamic nature of liquid such as water, wastewater, petroleum etc., and characteristic of storage tank, the measurement is difficult and it violate the accurate measurement. Instances of level measurement and control failure lead to tragic and costly consequences. Selecting the accurate level measurement technique for a particular application is a daunting task in the face of many options and limitations. Hence, this paper reviews liquid level measuring instruments used in the past 11 years. Both the contact and non-contact measurement are discussed, and their development on measuring liquid level is also covered in this review paper. From the study, it is clear that ultrasonic sensors are most widely used for liquid level measurement with high accuracy while neglecting the drawback of the echo inside the tank.
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