JOYO M&C – Servo Tank Gauge Manufacturer & Suppliers

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.

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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.

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Slight glass level gauge

A glass of sight or a water gage is a transparent tube through which a tank or boiler operator can observe the level gauge of liquid contained in it.

It is positioned parallel to the vessel along the elevation over which the level gauge is to be indicated and mounted with appropriate fittings for retaining the pressure and sealing the ends of the sight tube.

However, this building is not well adapted for use with hazardous process liquids.

Reflex Level Gauges

A reflex gage is more complicated than a slight glass, but it can make a better difference between air (steam) and fluid (water).

The gage comprises a vertically oriented slotted steel frame with a powerful glass tray installed on the open end of the cabinet facing the user, rather than holding the documents in a glass box.

Most of the light is transferred from the bottom of one drawer to the next and back to the user in the area that is contact with the water, appearing creamy white. In the area in touch with the fluid, most of the light is refracted into the fluid, which causes this area to look nearly black to the user.

Bi-Color Level Gauges

For caustic media, a bi-colour gage is usually chosen to provide protection for the crystal. The gage comprises of a vertically oriented, slotted steel frame with a powerful simple front and back glass.

The front and rear surfaces of the body are in vertical planes that are not parallel. Behind the reference body are light sources, typically red and green, with two quite distinct colors. The fluid area looks blue to the viewer due to the distinct refraction of blue and blue light, while the gas area looks purple

Magnetic Level Gauges

The magnetic value gage does not take an immediate view of the point (i.e., glass is not needed), the test room can be transparent and the building of welded steel is usually used.

This significantly improves the variety of working temperatures and reduces the roughness relative to test glass rooms. The broad temperature spectrum is feasible because the chamber of measurement can have about the same heat growth ratio as the ship, and there is no plastic to interact with the chamber of steel.

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Level gauges take level readings using several different techniques. The measurement technology should be chosen based on the user’s application. These level sensors also have different display options based on user preference.

Magnetic level gauges – A magnetic level gauge is used to control the level of fluids. The gauges operate under Archimedes Principle, which states that any object submerged in a fluid experiences the same buoyant force as the weight of the liquid displaced. Magnetic level gauges are extremely durable and can be used in applications that would break or destroy glass gauges. They can be used underground with a maximum working temperature and pressure range of 4000C and 220 bar. These gauges are capable of inter-phase level detection, even in highly toxic or corrosive mediums.

Reflex level gauges – A reflex level gauge is used to detect level in a vessel or container. It operates by using the dissimilarity in the index of refraction between fluids and vapors. They are usually made of carbon or stainless steel, which provides the durability needed to work in a temperature and pressure range up to 400°C and 400 bar respectively. If the vessel is filled with vapor, the observer will see a silvery white color because the light radiations running into the grooved surface of the sight glass will be completely reflected. If the vessel is filled with liquid, the observer will see black because the light radiations coming across the liquid region will be completely absorbed. The sight glass is a transparent tube which is clamped to the gauge body.

Transparent level gauge – Transparent level gauges are very similar to reflex level gauges. They consist of two transparent glasses which are integrated with the liquid cavities on both sides. Transparent level gauges work by detecting the dissimilarity in the transparent characteristics of two glasses which are integrated with the liquid cavities on both sides. In an application which uses water and steam, an illuminator is employed to make the liquid level easier to see. The light rays emitted by the illuminator are directed in an upward direction towards the water column causing the surface of the liquid to become illuminated. The light radiations generally fall upon the divided surface between water and steam and then reflect back to the eye of the user.

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Nuclear or nucleonic level gauge measurement devices can be employed in both point and continuous level gauge detection applications. They are usually applied in fields where all other level gauge measurement techniques fail to work owing to their capability of working with hazardous situations. In this method, energy needed for level gauge measurement is emitted arbitrarily by radio isotopes in the form of bursts.

The major source utilized in nucleonic level gauge controls includes gamma radiations. These are electromagnetic radiations which exhibit almost identical behavior to that of microwaves and light waves. However, they have comparatively higher energy and shorter wavelength owing to which these radiations are competent enough to break through the walls of process vessel and material.

The field strength of these gamma radiations is determined by a sensor mounted on the other end of the vessel, which ultimately detects the level gauge of process material in the vessel. “Different radioisotopes are used, based on the penetrating power needed to “see” the process within the vessel. With single point gauges the radiation provides a simple on/off switching function, whereas with continuous level gauge measurement the percentage of transmission decreases as the level increases.”

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They operate on the principle of communicating vessels, which refers to separate containers that are connected via extrusion outlets to allow low- or high-density fluids of either homogenous or heterogenous consistencies to flow between the vessels.

The chamber, or auxiliary column, of the magnetic level gauge is equipped with a float containing a set of permanent magnets. Fluctuations in the fluid of the primary chamber will result in commensurate changes within the magnetic level gauge. The magnetic float rises and falls on the surface of the fluid, registering these changes on the external measurement indicator. This indicator is typically constructed using a magnetized shuttle that moves in conjunction with the interior magnets.

This technique is advantageous as it does not require restrictive mechanical guide rails and instead relies on the limited lateral motion of the float within the column of the magnetic level gauge. It is also suitable for fluid mixtures of varying densities, with variable float designs and materials suitable for the specific gravity of numerous measured fluids, including acids, butane, oils, water, and heterogenous fluid interfaces.

Magnetic level gauges are increasingly preferable to alternative level measurement systems owing to their improved thermodynamic resistances over apparatuses such as sight gauges. They can withstand high process temperatures and are optimized for high pressure applications. Unique process demands can also be met using bespoke magnetic level gauges with oversized columns and floats with improved buoyant characteristics.

This article comes from abb edit released