The magnetic level indicator (MLI) or magnetic Level Gauges are used to measure levels of fluid using a floatable device that can float in both high and low density fluids. The magnetic Level Gauges were initially designed as an alternative to glass sight gauges but they are now being widely used in process industries, new constructions and plant expansions. The magnetic Level Gauges are often used in applications where the glass sight gauges are unsafe, environmentally risky or difficult to see.
Principles of operation of the magnetic Level Gauges
The magnetic Level Gauges use the principle of magnetic field coupling to provide information on fluid level, to activate a switch and to provide continuous level data. During measurement, the coupling allows the magnetic level gauge to measure without any direct contact between the indicator and the fluid in the vessel. The magnetic field consists of lines of flux surrounding the magnet and the magnet field acts on other objects with sufficient force to move the object.
In the MLI, the magnets within the float and the indicator are magnetically coupled to create a magnetic field which penetrates the chamber wall to couple with the magnetic field created by the magnets in the indicator flags that displays the levels. The float which is located inside the chamber tracks the surface of the liquid. Selecting the appropriate magnetic level gauge for a specific application depends on several factors that include the kind of process fluid, its specific gravity, operating temperature and pressure including the necessary level range.
The safety benefits of magnetic Level Gauges over the glass sight gauges
- The most obvious advantage of the magnetic level gauge indicator is the reduced possibility of breakage even under extreme pressures or temperatures. The magnetic level gauge indicators are designed to accommodate severe environmental conditions up to 210 bars at 370oC.
- The pressure boundary of the MLI is made of robust metal making it strong and safe as a vessel. The indicators, transmitters and switches are all mounted externally so that it is not affected by toxicity, corrosiveness or other characteristics of the fluid process.
- Another safety benefit is chemical compatibility with the fluid which is restricted to 3 components: metallic chamber, gasket and float. The glass sight gauges have compatibility issues with wetted materials like glass, metal and sealants.
- Level gauge are virtually maintenance-free once it is installed because the indicator never touches the process fluid. Sight glasses have to be periodically cleaned and checked for leaks. Very often scales and build-up on the glass from process fluids makes the sight glass unreadable.
- In the magnetic Level Gauges, visibility is possible even from a far distance (100 feet) while the sight gauge level gauge indicators are only intended to be viewed from a distance of around 10 feet.
- Installations of the level gauge are a lot easier and simpler. In many cases the sight glass gauges are only available in 12-inch length due to weakness of glass. If the required visible indication length is increased, additional sight gauges are required which increases the possibility of leak joints.
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These servo gauge offer a robust and modular construction and a minimum number of moving parts, which results in a very low maintenance and a longer service life.
The servo gauge has become an industry standard around the world. The meter is multifunctional: in addition to the liquid level, integrates density and water level (free) interface measurement with the highest accuracy available on the market. Reliable, versatile and accurate, it meets all international standards, and can also be used in overfill protection loops to prevent spills. Together with a design with minimal moving parts and a modular construction for easy maintenance, it helps users to reduce operating costs.
The servo gauge as an alternative to mechanical float and belt sensors or other low-cost measuring devices with superior servo amplifier technology. The servo-manometer offers the proven accuracy and performance of the advanced technology meter.
Tank Monitors represent the leading edge in liquid level monitoring for Mobile, Portable and Frac (Frack) Tank applications. Ideal for remote locations, Garnet’s self-powered engineered system operates reliably for years on battery power. Easy to install and virtually maintenance-free, the storage tank gauges is the industry’s choice for accurate, reliable, trouble-free operation of their liquid management systems.
Storage tank gauges not only provide data on tank volume and temperature but also automates client-driven actions. Programmable high or low levels may trigger client-defined actions such as alerts to management, Actuation of valves, pumps, or other control equipment, shutdowns and call-outs.
Clients needing knowledge relating to their stores of chemical, water / brine, refined products, crude, or any other liquids rely on Garnet every day. Reporting with wireless, SCADA network (Modbus), WITS, or via satellite or cell through our secure internet portal – our customers’ ability to view data from any location provides them with peace of mind.
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The sanitary level gauge offers a 360-degree view of the process fluid for liquid level verification, and process validation. Unique end fittings with integral 90 degree elbows, reduces process dead space, increases tank visual verification area, and eliminates the leak paths associated with secondary fittings.
Wetted surfaces are Type 316L Stainless Steel with an internal finish of 20 Ra/180 grit, borosilicate glass inner sight tube and gaskets per your specifications. The gaskets chosen will determine the temperature and pressure ratings of the unit and can be as high as 150psig.
The sight tube is manufactured from heavy wall borosilicate glass tubing, then tooled to a precision sanitary end configuration, similar to .75″ stainless steel sanitary fittings. The inner wetted borosilicate glass sight tube is then protected with an impact resistant full polycarbonate shield, which is held in place with delrin shield guides. Vessel connections vary with application, however .75″ sanitary tri-clamp ends are standard and center to center lengths are per your specification.
Pressure ratings are up to 150 psig – full vacuum, temperature ratings are up to 350 F. Others specifications are available, please consult the factory. Options for the Sanitary Level level gauge include materials of constructions, SS, Alloys and plastic, connection configurations, lengths, shielding and gaskets.
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We manufactures Tank Level Indicators and Tank Level Gauges for many liquid level sensing and measurement applications. We offer precision electronic level sensors as well as mechanical indicators for applications that do not have power available. Our mechanical Liquid level tape measure (LLTM series) provides a full to empty tank reading in inches via a tape measure.
The Level keeper indicator (LKI series) is a multi point system which displays full to empty readings via bright LED lights. We also have a Continuous Level Monitor (CLM series) which is designed for accurate continuous level indication with accurate readings every 1/4″ of level movement. The Ultrasonic Distance sensors are the most accurate and can be used in tanks up to 30 feet deep.
These multi point tank level indicators are a great choice for storage tanks and totes. They provide bright, easy to read, full to empty LED tank level gauge indication. These versatile float level indicators are available in all stainless steel, stainless & buna, and polypropylene. Additional output relays can be added for high and low alarms or pump control.
These vertical float type continuous level sensors are used in tanks and vessels that require precise liquid tank level gauge indication. They are offered in all stainless steel, stainless & Buna, or polypropylene. The sensor is a 3 wire potentiometer that provides a change in resistance every ¼” of level movement. Use a digital panel meter to display the exact liquid tank level gauge reading or signal conditioner which provides a standard 4-20mA output signal.
These non contact ultrasonic distance sensors provide highly accurate level indication and can measure lengths up to 30 feet. They are great for tank farms and large outdoor storage tanks. They can be used to detect liquids or solids and come with various output options.
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The Enraf servo gauge 854 ATG/XTG is equipped with a patented Servo Auto Test feature that increases its safety integrity as well as diagnostic coverage, allowing it to be used in overfill protection loops to prevent spillage. It has a Safe Failure Fraction (SFF) of more than 90% which allows it to be used in SIL-2 safety loops. If used in a redundant configuration, the servo gauge can also be used in SIL-3 rated loops.
With these diagnostics, the safety proof-test interval can be extended to 5 years, significantly bringing down the operational cost compared to other solutions that require a proof test to be carried out every year. A highly accurate and advanced force transducer, microprocessor control and advanced software give users precise, reliable measurement and control.
Installation is easy. Almost any nozzle 2” and up can be used, even with the tank being in service. To simplify startup, calibration and servicing, the portable tool can be used to bypass the central system.
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When it comes to our customers, we have a pretty good idea of how much fuel is in their tank. It’s based on a series of calculations and basic knowledge of your home, all of which are outlined on our How does automatic delivery work page. Whether you’re an automatic delivery customer or a will-call customer, the oil tank in your home has a tank gauge for LPG LNG on it. We would like to help you know how to read your tank gauge and how much fuel is in your tank based on where the tank gauge for LPG LNG is.
There are several different types of tank gauge for LPG LNG that are install in tanks, one of the most popular and difficult is a bobber type tank gauge for LPG LNG. This a long glass tube with lines for full, ¾, ½, ¼, and measurements in between. Inside the tube is a bobber that represents where how much oil is in the tank, similar to the image above. Many of customers will call and state that the tank is empty when the bottom of the bobber hits E. The bobber is meant to be read from the top down. So if the top of the bobber is at ¼ you have enough oil for several days in the winter, but should schedule a delivery or a delivery will be on it’s way. Other tank gauge for LPG LNG include dials and old time outside thermometer styles which can be easier to read off.
Now, what does a ¼ tank mean? Using the image below you’ll know how much fuel is in your tank at any given moment. Now, these numbers are based on a standard 275 oil tank. When the tank is full will only have about 255 gallons in it instead of a full 275. This is because of air inside the tank that prevents it from being maxed out. When a driver makes a delivery they listen for a whistle that comes from the vent pipe (one of the two pipes that run out of your tank). This whistle means that the tank is full.
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We offers a wide range of consultancy services to support your tank terminal automation requirements.
- Tank terminal automation system design review (P&IDs, System Architecture, Control Panel drawings, PLC I/Os, etc).
- Selection of tank terminal automation equipment likes flow meters, preset controllers, control valves, tank gauging system, access control system, Weighing Bridges, HMI / tank terminal automation software, etc.
- Generation and review of functional design specifications and test procedures.
- Metering standards & flow calculations.
- Flow meter & instrument calibration.
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Automatic tank gauge system provides highly customizable automatic tank gauge solutions exceeding petroleum site owners fuel and compliance management needs.
Today, we are providing a one-of-a-kind automatic tank gauge with the most advanced fuel monitoring technology to over 500,000 tanks worldwide.
The automatic tank gauge is the premier wet stock management solution that combines precision performance with scalability, sophistication, customization and ease of use.
The automatic tank gauge accurately delivers crucial information on-site or remotely when you need it during busy dispensing periods, when scheduling deliveries, when reconciling fuel variances.
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