Can the probe of an ultrasonic level gauge be installed at the bottom of the container being measured?

What is the point of making such a change? What is the purpose?

I read about it in a book; I don’t understand it either, so I’m here for help.

One type of ultrasonic level measurement method: liquid-medium type~~The other two are gas-medium type and solid-medium type~~

Theoretically, it is feasible, but in practice it is rarely done. After all, an air medium is commonly used, and such an installation places high demands on the medium inside the tank; unless it is customized for special situations, it is likely to be used very seldom.

Could the original poster explain why it needs to be used this way? I think it can be achieved no matter where it’s installed; this tests the ability of the level gauge to withstand harsh environments! What concerns me the most is why it has to be used this way What are the advantages of using it this way? If there are no advantages, why not try a different method of measurement?

I read about it in a book; I don’t understand what’s going on either

Exclusion method: In situations where radar or flange level gauges cannot be used, and there are volatile vapors in the upper part of the storage tank making it impossible to install probes there, ultrasonic probes submerged in the material were considered as a solution for measurement.

This question is well-asked: lol

This post was last edited by yuchenchf on 2017-4-22 07:58. Principle: It is based on the time-domain echo principle of ultrasonic pulses. The ultrasonic sensor of the level gauge emits ultrasonic pulses, which travel through the liquid after passing through the bottom of the tank; upon reaching the interface between the liquid and gas, they are reflected and return to the detector. The height of the liquid is determined by calculating the time difference and the speed of ultrasound propagation in the liquid. This measurement method of external liquid level gauges truly enables non-invasive sensing by \"penetrating through the wall.\" When using such gauges, it is not necessary to make any holes in the container; they are particularly suitable for applications involving high pressure, severe corrosion, or toxic and hazardous conditions. The explosion-proof ultrasonic liquid level controller (J15D3IB), which is designed, developed, and manufactured by Jiangqun Technology Co., Ltd., falls into this category. The ultrasonic probe is attached to the outer wall of the container being tested, right below it, and can penetrate container walls made of steel, iron, stainless steel, glass, plastic, or fiberglass up to a thickness of 18 millimeters ； It enables continuous and accurate measurement of the liquid level inside the tank, with no contact at all with the liquid and gas within the tank, thus achieving true isolated measurement. Therefore, it possesses seven advantages that no other level gauge can match: 1. It can be used in the most demanding environments—capable of measuring liquids with any pressure, extreme toxicity, high corrosivity, absolute sterility, or extremely high purity, as long as their sound speed is known. 2. Safety—when measuring liquids that are toxic, corrosive, under pressure, flammable, explosive, volatile, or prone to leakage, since both the sensing element and the instrument are located outside the container, there is no contact with the liquids and gases inside the tank during installation, repair, or maintenance, ensuring high safety. Even when the instrument is damaged or under maintenance, there is absolutely no possibility of leakage. 3. Environmentally friendly – It features true isolation measurement, with no contact at all with the medium being measured; there is absolutely no risk of liquid or gas leakage, and it does not pollute the environment, making it a truly green and environmentally friendly instrument. 4. Convenience and cost-effectiveness — Online maintenance can be carried out without shutting down production. Since there is no need to make holes in the container, nor are flanges or connecting pipes required, installation and maintenance are extremely convenient and cost-effective. 5. Durable and reliable—The measuring head and instrument contain no mechanical moving parts, and are tightly sealed to isolate them from the outside environment; as a result, they do not wear out or corrode, making them highly durable and reliable with minimal maintenance required. 6. Precision: It features temperature compensation and continuous automatic calibration to ensure the highest measurement accuracy at all times. The precision is 1 millimeter, with a maximum range of 3 meters. It can be used properly and provide accurate measurements even in different temperatures as well as on moving vehicles and ships. 7. It features an LCD display and is easy to use: simply apply coupling agent to the probe, press it firmly directly below the container, and wait until the echo is appropriate. Main applications: 1. Level measurement for household gas cylinders, carbon dioxide fire extinguisher cylinders, refrigerant cylinders, oxygen cylinders, and syrup cylinders. 2. Real-time and accurate monitoring of the oil level in the fuel tanks of vehicles, ships, aircraft, generator sets, and internal combustion engine equipment. 3. The probe is installed inside the tank wall to measure water depth on the ship. 4. Precise measurement of the liquid level in tank trucks, railway tank cars, and tank ships (all liquids with known sound speeds such as milk, syrup, liquid carbon dioxide, liquid nitrogen, etc.) or oils (gasoline, kerosene, diesel, engine oil, crude oil, vegetable oils). 5. Precision measurement of oil levels in various oil tanks and drums used for oil refining and storage. 6. Real-time and accurate monitoring of the liquid level in storage tanks, containers, and vessels used in chemical plants for storing liquids of all known sound speeds (saltwater, phenol solution, nail polish remover, liquefied gas, liquid carbon dioxide, liquid nitrogen, liquid chlorine, hydrochloric acid, sulfuric acid, nitric acid, chloroform, propylene, methyl tert-butyl ether, unsymmetrical dimethylhydrazine, ammonia, butadiene, vinyl chloride, light hydrocarbons, bromine, anhydrous hydrogen fluoride, toluene, hydrogen sulfide, xylene, tetrachloroethylene, ethylene oxide, propane, ethanol, Freon, ethylene, ammonia water, methanol, and so on). 7. Level monitoring of liquids (vegetable juice, fruit juice, grape juice, vinegar, soy sauce, alcohol, syrup, cola, sugar water, tea) in storage tanks, storage barrels, and storage containers in food factories, sugar mills, yogurt factories, soy sauce factories, wineries, vinegar factories, beverage factories, tea beverage production lines, carbonated beverage production lines, and cola factories. 8. Level detection of liquid (traditional Chinese herbal medicine solution) in storage tanks, storage barrels, and storage containers in pharmaceutical factories. 9. Liquid level detection for mineral water and purified water production lines, seawater desalination, as well as liquid storage tanks, barrels, and containers. 10. Fire water tanks, real-time monitoring of water levels in tap water systems, sewage treatment facilities, agricultural irrigation systems, canals, reservoirs, as well as rivers, lakes and seas. Technical parameters: Range specification – 3m (5–80M available); Display resolution: 1mm; Container wall thickness – 1–18mm (1–40mm available); Short-term repeatability: 1mm; Power supply – DC 9–36V; Measurement error: 1‰; Power supply – AC 220V (110V, 220V) ； 60-220V optional) Operating temperature of the main unit: -20°C to +70°C. Display: LCD display. Operating temperature of the probe: -40°C to +100°C (250°C optional). Output: 485 interface, two sets of passive open and closed output contacts (defaultly closed)