【Q&A Question 204】2017.07.23
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【Q&A Question 204】July 23, 2017: According to their working principle, into which categories can instruments for measuring liquid level be divided? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) It can be divided into: direct-reading level gauges ； Differential pressure level gauge ； Buoyant level gauge ； Electromagnetic level gauge. 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 1 Wealth point will be given to the participant. For continuous malicious spamming, 2 Wealth 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 Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
1) Direct-reading type (2) Differential pressure type (3) Buoyancy type (4) Electromagnetic type (5) Radar type
Direct-reading level gauge； Differential pressure level gauge ； Buoyant level gauge ； Electromagnetic level gauge ； Acoustic level gauge ； Nuclear radiation level gauge
Differential pressure type, double flange type, float type
1. Direct-reading level gauges: Important examples of such gauges include glass tube level gauges and glass plate level gauges. 2. Differential pressure level gauges: These can be further divided into pressure-type level gauges and differential pressure type level gauges; they function by utilizing the principle that a liquid column or accumulated material creates pressure at a specific point. 3. Buoyant level gauges: They operate on the principle that the height of the float changes as the liquid level changes, or that the buoyancy exerted by the liquid on the float (or sinker) submerged in the liquid changes with the liquid level. It can be further divided into several types, such as those with floats equipped with steel cables or steel strips, those with floats having levers, and the barrel-type ones. 4. Electromagnetic level gauges: They convert changes in liquid level into changes in electrical quantities, and by measuring these electrical changes, the liquid level can be determined. It can be divided into resistive (i.e., electrode-type), capacitive, and inductive level gauges, among others. There are also level gauges that utilize the magnetostrictive effect. 5. Nuclear radiation type level gauge: It operates on the principle that the intensity of nuclear radiation as it passes through a material changes depending on the thickness of the material layer. Gamma rays are now used more frequently. 6. Acoustic property meters: Since changes in liquid level cause changes in acoustic impedance, as well as differences in the distance at which sound waves are blocked and reflected, by measuring these changes it is possible to determine the liquid level. Therefore, acoustic level gauges can be classified into acoustic interruption type, reflection type, and damping type based on their working principles. 7. Optical level gauges: These devices utilize the principle of light waves being blocked or reflected by the level of a substance; the light source used can be ordinary incandescent lights or lasers, among others.
Direct-reading, static pressure, buoyancy, mechanical contact, electrical, etc.
Float type, differential pressure type, direct reading type, electromagnetic type, etc
Double flange, magnetic flap, float type, differential pressure type
Manual measurement. Buoy. Glass plate. Magnetic flap. Capacitance resistance.
1. Direct-reading level gauges: Important examples of such gauges include glass tube level gauges and glass plate level gauges. 2. Differential pressure level gauges: These can be further divided into pressure-type level gauges and differential pressure type level gauges; they function by utilizing the principle that a liquid column or accumulated material creates pressure at a specific point. 3. Buoyant level gauges: They operate on the principle that the height of the float changes as the liquid level changes, or that the buoyancy exerted by the liquid on the float (or sinker) submerged in the liquid changes with the liquid level. It can be further divided into several types, such as those with floats equipped with steel cables or steel strips, those with floats having levers, and the barrel-type ones. 4. Electromagnetic level gauges: They convert changes in liquid level into changes in electrical quantities, and by measuring these electrical changes, the liquid level can be determined. It can be divided into resistive (i.e., electrode-type), capacitive, and inductive level gauges, among others. There are also level gauges that utilize the magnetostrictive effect. 5. Nuclear radiation type level gauge: It operates on the principle that the intensity of nuclear radiation as it passes through a material changes depending on the thickness of the material layer. Gamma rays are now used more frequently. 6. Acoustic property meters: Since changes in liquid level cause changes in acoustic impedance, as well as differences in the distance at which sound waves are blocked and reflected, by measuring these changes it is possible to determine the liquid level. Therefore, acoustic level gauges can be classified into acoustic interruption type, reflection type, and damping type based on their working principles. 7. Optical level gauges: These devices utilize the principle of light waves being blocked or reflected by the level of a substance; the light source used can be ordinary incandescent lights or lasers, among others.