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The magnetic level gauge is now widely used throughout process industries as an effective level control device.

A magnetic level gauge is often used in applications where a sight glass (or glass sight gauge) is either ill-suited based on process variables or is underperforming based on plant requirements. These can include enhanced safety for personnel; environmentally risky situations including media leakage or fugitive emissions; need for maintenance reduction; or need for high visibility from a distance.

Safety

The obvious safety benefit of the level gauge over a sight glass is reduced chance of breakage. If the process fluid is under extreme pressure or temperature, the likelihood of sight glass breakage is increased. The pressure boundary of an level gauge is made of robust metal, frequently the same as the vessel piping, making level gauge as safe as the surrounding piping system itself. The indicators, transmitters, and switches are all mounted externally and, therefore, are unaffected by toxicity, corrosiveness, or other process fluid characteristics.

Another safety benefit is that the chemical compatibility with the fluid in an level gauge is restricted to only three components, the metallic chamber, gaskets and float. With glass sight gauges, the process fluid may have chemical compatibility issues with any of the wetted materials—glass, metal, or sealants.

Maintenance

Level gauges are virtually maintenance free once installed because the indicator never touches the process fluid. With sight glasses, the gauges must be periodically checked for leaks and cleaned on a regular basis. Scaling, etching and build-up on the glass from the process fluid can cause the sight glass to become unreadable.

Visibility

Visibility of the fluid level from long distances is another major reason for selecting an level gauge over a sight glass gauge. Sight gauge level indicators are intended to be viewed at maximum distances of around 10 feet (3 meters). However, the bright contrasting colors of the flags or a fluorescent shuttle on an level gauge permit visible level indication at distances up to 100 feet (30 meters) or greater.

This article comes from magnetrol edit released

Magnetic float level gauges, also known simply as magnetic level gauges or magnetic level indicators, provide a continuous visual indication of liquid level in a vessel or tank. Being a robust, relatively cheap level measurement technique suitable for high pressure systems they are found throughout the process, oil & gas, refinery, chemical, petrochemical, and power generation industries.

How does a Magnetic Level Gauge Work?

A magnetic level gauge contains a float, typically made from stainless steel, titanium or plastic which contains an integral, permanent omni-directional magnet. The float is contained in a bypass chamber connected to the vessel. This buoyant float rises and falls with the liquid or interface level whilst the magnet “flips” the magnetic wafers mounted externally to the chamber. As the float rises and falls each wafer rotates 180° and so presents a contrasting colour.

General industry practice is that the wafers above the float show white, whilst those below show red. Hence the indicator then presents a clearly defined and accurate level measurement of the liquid in the chamber.

Float Magnet Construction

The magnetic field is the heart of the magnetic level gauge – the stronger the field, the more reliable the instrument will function. Some manufacturers use a single annular ring magnet, others use a series of single bar magnets in a circular array in their float design. These designs tend to provide better performance than a single bar magnet.

Mounting of Magnetic Level Gauges

Like Reflex Gauges, magnetic level gauges are connected laterally to a vessel via at least 2 process connections. The process connections can be flanged, threaded or welded. The level in the bypass chamber corresponds to the level in the vessel. It is worth noting that the bypass chamber can be manufactured to any length and mounted to suit the best viewing angle therefore bespoke level gauges can be made to suit awkward installations. It is common practice to provide shut off valves between vessel and level gauge to allow removal of the level gauge without emptying the vessel. Depending on the properties of the fluid being measured, and process conditions a vent valve and/or a drain valve may also be specified in the hookup. The highly contrasting colours used on the level gauge flappers means there is normally no need to provide an additional light as is often the case with reflex level gauges.

Float Damage Warning

Many magnetic level gauge manufacturers offer the option of incorporating a damaged float warning system. This is achieved by extending the bypass chamber below the bottom process connection enough to allow the float to pass the process connection. The indicator wafers below the process connection are mounted either with their colours in reverse, or coloured yellow and white. Should the float drop into that zone the wafers will turn presenting a sharp, immediately readable indication of float failure.

Interface Applications

The magnetic level gauge is ideally suited for measuring a liquid interface. Floats are available to meet a variety of specific gravities to suit the liquids being monitored – many manufacturers offer floats suitable for specific gravity ranges of 0.33-2.2. See our page on Liquid Level Interface Measurement for mor information on measuring liquid interface.

This article comes from control edit released

Reflex level gauges may be applied in numerous applications to include feed water heaters, DE aerators, boiler drums, and other types of tanks.

For a reflex level gauge, within the recess of a liquid chamber and behind a single piece of glass, is the liquid column that clamps down onto the gauge body. This glass is flat on the outside and on the inside has a series of prism grooves that face the vapour and liquid space. Based on whether light enters the vapour or liquid space, it is reflected or absorbed, respectively.

Once light encounters a groove’s surface within the vapour space it reflects to the surface of the grooves on the opposite side, followed by reflecting completely back to the observation direction. During the liquid phase, light is absorbed, which creates one display for the area that is covered by liquid and another display for the area located above the liquid.

Using the prism glass, a reflex level gauge accurately measures liquid inside the vessel. When light hits the glass where there is no liquid, the prism reflects the light directly out of the gauge. Known as the “dry” area, a silver colour is displayed while the “wet” part is displayed in black. The contrasting colours create a clear delineation line that makes it easy to view the measurement.

The external chamber is a self-contained cage designed for use with our top mounting level transmitters or switches. Quality construction and a wide selection of configurations make this cage an ideal means of utilizing the power of our many technologies without mounting directly into the process vessel.

Level gauges provide a number of benefits that are industry-specific. A manufacturer like Shridhan that has specialized expertise in Manufacturing level gauges you have full assurance of enjoying optimal performance and reliability.

We understand each and every application and their advantageous to our end-users, making our products precise.

This article comes from shridhan edit released

Liquid level gauges are used to monitor and regulate levels of a particular free-flowing substance within a contained space. These substances are usually liquid, however liquid level gauge can also be used to monitor solids, such as powders. There are many different types of liquid level gauge, and they have several uses, both industrial and in the household for example.

Liquid level gauges are widely used industrially. Cars use liquid level gauge to monitor a variety of liquids, including fuel, oil and occasionally also specialist fluids such as power steering fluid. Liquid level gauge can also be found in industrial storage tanks, for slurries, and water level gauge can even be found in household appliances such as coffee machines. Basic liquid level gauge can be used to identify the point at which a liquid falls below a minimum or rises above a maximum level. Many liquid level gauge can detail the specific amount of liquid in a container relative to the minimum/maximum levels, to provide a continuous measurement of volume.

There are a number of different types of liquid level sensor used to detect the point level of a liquid. Some types of liquid level sensor use a magnetic float, which rises and falls with the liquid in the container. Once the liquid, and by extension, the magnet, reach a certain level, a reed magnetic switch is activated. Commonly, there is a switch towards the top and the bottom of the container, allowing detection of minimum and maximum levels of liquid. Many liquid level gauge also include a protective shield to protect the magnet from turbulence or interference from direct contact with the liquid.

Another common type of liquid level sensor is known as a Conductive sensor. Only liquids which conduct electricity can be used in this liquid level sensor. A Conductive Sensor includes a source of power, usually of a fairly low voltage. At least two electrodes are placed within the container. When a conductive liquid reaches a certain point, it will come into contact with both a longer and a shorter electrode, and thus complete a circuit and activate an internal switch.

Pneumatic sensors are also a fairly common occurrence with particularly hazardous liquids, or in systems where the use of electricity is not viable or possible. This is because the sensor itself does not come into direct contact with the liquid at all. The sensor detects the level of air between the liquid and the pneumatic sensor, then uses this to calculate the amount of liquid used to fill the remainder of the container. These types of liquid level gauges are also relatively cost-effective.

There are also other types of liquid level gauge which offer continuous measurement of liquids. Magnetostrictive liquid level gauges are similar in design to regular magnetic float sensors, yet the magnet level is measured using a magnetostrictive wire, which will react when its magnetic field is interrupted by the presence of the magnet. The exact point at which this interruption occurs can be determined by the distance between the bottom of the wire and the point of interference. Alternatives to this design include a magnetoresistive sensor, whereby an additional magnet is inserted onto the arm of the float, allowing accurate triangulation of the exact position of the magnets. This type of liquid level sensor is commonly used in conjunction with computer programs due to its accuracy. A non contact liquid level sensor features advanced signal processing technology in order to enable non contact liquid level detection.

This article comes from tc-fluidcontrol edit released

The magnetic level gauge working principle is widely used in level instrumentation. The interaction between float magnets inside the chamber and magnetic flags outside the chamber provide virtually maintenance-free, continuous level information. This type of level gauge doesn’t require power, making it ideal for a variety of applications across industries.

The magnetic level gauge working principle is based on the effects that one magnet has on nearby magnets. The mechanics are simple yet very effective, yielding reliable and repeatable level information for continuous monitoring and recording of fluid levels.

What Is the Magnetic level gauge Working Principle?

The working principle behind a magnetic level gauge is that the measuring instrument shares the same fluid — and therefore, the same level — as the vessel. The level gauge is attached to the vessel and connects directly with the fluid to be measured. Within the chamber is a float with a magnet assembly inside. This float rests on the fluid’s surface. As the fluid level rises or falls, so does the float. As the float moves up or down, the magnet assembly rotates a series of bi-color magnetic flags or flaps, changing the visual indicators mounted just outside the chamber from one color to the other.

Since the magnetic level gauge working principle relies on the interaction between magnets, these level measuring instruments do not need a power source. They are also virtually maintenance-free. An additional advantage: The indicator’s magnetic force can affect optional switches or transmitters mounted outside of the chamber. The colored flags are easy to see, even from a distance, and are paired with a scale for precise readings. As for any level instrumentation, the size and material of the float are chosen according to the media, temperature, pressure, and density of the process media.

This article comes from wika edit released

Level gauge measurement is essential whenever a production process uses liquids or small particulates. As technology advances, new types of measurement tools that use radar or ultrasonic frequencies have emerged, but in many cases, level gauge measurement systems are still the best option. Let’s take a closer look at the benefits of relying on level gauge measurement systems over other industry options.

Accuracy

While non-contact measurement systems can be accurate, they often need recalibration to ensure they’re providing the correct information. Most level gauge measurement systems are straightforward — for example, float switches are nothing more than a float attached to an arm. It’s the same technology that controls your car’s fuel gauge. Other variables that could affect a non-contact reading, like foaming, don’t influence them. These simple devices can also provide accurate readings in many different substances, from liquids to solids or small particulates without any additional calibrations. That’s something not even guided wave radar sensors can do.

When two liquids of different densities are in the same tank, non-contact systems can’t measure them accurately. Interface sensors could tell you how much total liquid is in the tank, but don’t know where the two different fluids separate or the level gauge of the bottom liquid.

Durability

One of the best things about contact measurement systems is their simplicity. They usually don’t have a lot of moving parts, which means they require less maintenance and are infinitely more durable than non-contact systems. Their simplicity also means if an element does fail, it’s often easy to replace without having to empty the tank or interrupt the supply chain.

This feature is valuable in the process industry, especially if the materials stored in the tank are caustic, corrosive or otherwise too dangerous for human workers to enter to effect repairs. Many industries use acid in various concentrations for a variety of different tasks. Even when empty, an acid tank may be too dangerous for a maintenance worker to enter, even with the proper personal protective equipment.

Customization

Not all measurement systems are equal, but that isn’t a bad thing. Some level gauge measurement systems will only work for liquids, while others can work for liquids, particulate matter and slurries with equal accuracy. These measurement systems are easy to customize for different materials. Many contact measurement systems won’t work well for corrosive or sticky materials — an optical switch, for example, might not work well in oil because the sticky substance will cover the prism and prevent it from transmitting light.

This customization also makes it simpler to connect multiple different types of systems to a single readout so workers can monitor the level gauges remotely without having to make a trip to each tank. If you’ve got containers of oil, acid and water in the same facility, you don’t need to use the same system for each of them, but link them on one readout for ease of monitoring.

This article comes from controlglobal edit released

Magnetic Level Indicators, also referred to as level gauges, consist of a chamber, a magnetic float and a flipper type indicator scale mounted to the side of the chamber. Understanding the operation of the Magnetic level gauge indicator is quite simple. The fluid in the tank seeks its own level inside the chamber.

The magnetic float in the chamber rises and falls with the fluid level gauge. As the Magnetic float rises and falls, it changes the orientation of the flippers on the scale providing a visual level indication. In addition, as the magnetic float rises and falls, it actuates any transmitter or alarm switches that are attached to the side of the gauge.

Magnetic level gauge indicators are custom made based on your requirements. The float construction is determined by the process fluid, pressure, temperature and specific gravity of the fluid. Magnetic level gauge indicators are generally made of 316SS, but can be made from a variety of other materials including CPVC, Kynar, Hastelloy, Monel or other exotic metals. A variety of mounting style options and process connections are available to meet your needs.

This article comes from babbittinternational edit released