【Q&A Question 142】2017.05.22
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This post was last edited by 955559 on 2017-7-21 at 22:53. [Q&A Question 142] May 22, 2017: Principle of operation of the vertical tube level gauge. The reference answers can be seen after *replying*; points are awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) A float-type level gauge measures the liquid level by utilizing a sensing element (float) whose buoyant force changes due to the variation in its volume submerged in the liquid. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with a detailed explanation; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html
It is based on Archimedes’ principle. The variable buoyancy type, also known as the float-type level gauge, works such that when the liquid level changes, the volume of the float submerged in the liquid varies; as a result, the buoyant force acting on it changes, causing displacement. This displacement is converted into an angular displacement through mechanical transmission in order to measure the liquid level
The sensing element of a float-type level gauge is a float submerged in the liquid; as the liquid level changes, the buoyancy changes, which is why it is called a float-type level gauge.
The sensing element of a cylinder-type level gauge is a cylinder submerged in the liquid; changes in liquid level lead to changes in buoyancy
The barrel-type level gauge is an early type of variable buoyancy level gauge. It has a simple structure, reliable operation, is not easily affected by the external environment, and is easy to maintain. Compared with differential pressure level gauges, isolation and purging tasks can often be avoided in many applications, and there are no issues such as vaporization within the pressure transfer tube or density differences
The sensing element of a barrel-type level gauge is a barrel submerged in the liquid; changes in liquid level cause changes in buoyancy.
The variable buoyancy type level gauge, also known as the float tube type level gauge, functions such that when the liquid level changes, the volume of the float tube submerged in the liquid varies; as a result, the buoyant force acting on it changes, causing displacement. This displacement is converted into an angular displacement through mechanical transmission, thereby enabling the measurement of the liquid level. Such level gauges can enable remote transmission and automatic adjustment.
Based on buoyancy, the float in the level gauge moves up and down with the liquid level
The sensing element of a float-type level gauge is a float submerged in the liquid; as the liquid level changes, the buoyancy changes, which is why it is called a float-type level gauge.
A barrel-type level gauge measures the liquid level by utilizing the change in buoyancy experienced by the sensing element (barrel) as a result of the variation in its volume when submerged in the liquid
The sensing element is a cylinder submerged in liquid; changes in the liquid level cause changes in buoyancy