Level gauges for liquid ammonia spheres and methanol storage tanks

The existence of error isn’t a problem with the level gauge; it’s probably due to the temperature difference

All calculations have errors, as long as the errors are within acceptable limits. In fact, a storage tank that has not been calibrated is inherently inaccurate. If the tank deforms, the volume corresponding to the same liquid level will also be different; therefore, a level gauge merely indicates the liquid level. The theoretical volume can be calculated from this level, and the mass is then obtained by multiplying this volume by the density. But is the density of the medium accurate? Differences in temperature at the top and bottom of the tank result in variations in density as well.

Magnetic flap switches are quite good; if precision is required, we can provide them along with magnetostrictive sensors. In the face of such problems, as instrument manufacturers, we should go to the site to examine the situation and identify the cause.

There are often some discrepancies between the on-site readings and those from remote sensors; generally, the on-site readings are used for calculations, while the remote sensor readings are used for control and monitoring purposes.

External-mounted level gauge, accurate measurement. . :)

A steel strip or a guided wave radar can be used; the accuracy mentioned refers to the liquid level. If changes in temperature or pressure lead to changes in volume or liquid level, it is not possible to eliminate such errors

I saw what you said before; now the research has been going on for about 12 years, right? Logically speaking, double-flange types should be capable of measurement; it’s mainly the temperature that has an impact. Currently, both the magnetic flip type and double-flange types have insulation material at the flange positions, and the magnetic flip level gauge releases fluid at intervals to monitor level changes. Currently, the calculation of production is done using magnetic flap switches, and this has a significant impact on the production figures. Moreover, the group company has recently required us to measure the liquid level in the spherical tanks; our design institute recommended the use of servo level gauges. However, we haven’t found any companies that are currently using them, so we don’t want to take any risks. The main goal is to get in touch with a few companies that are currently using it. When using servos, it requires an opening in the spherical tank, which involves changes to the pressure vessel and makes external inspections complicated as well.

This post was last edited by yuchenchf on 2017-4-22 07:59, with a post about an explosion-proof ultrasonic level controller (J15D3IB). The ultrasonic probe is attached to the outside of the container being tested, right below its outer wall, 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, without any contact with the liquid and gas within it, 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, high toxicity, strong 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 no possibility 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 connection 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 (saline water, 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 detection 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 liquids (traditional Chinese herbal medicine solutions) 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 selectable) Operating temperature of the host: -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)