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The magnetic level gauge is now widely used throughout process industries as an effective level control device (see our recent article on MLI technology and principle of operation for more information).

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. Typical shortcomings of glass sight gauges include:

• • High pressures, extreme temperatures, deteriorating seals/rings/gaskets, and toxic or corrosive materials may cause a risk of fugitive emission of dangerous substances.
  • The glass in a sight glass can become quickly discolored, thus decreasing level visibility, or it can acquire microfractures, which can become a personnel safety issue if left undetected.
  • Liquid/liquid interfaces can be very difficult to read in a sight glass particularly if the liquids are of similar color. Clear liquids can also be difficult to see in a sight glass.
  • Liquids that tend to coat or build-up on surfaces can hinder visibility by forming an opaque film on the glass.
  • To cover a large measuring span, sight glass assemblies typically must be staggered using multiple sections.

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Safety

The obvious safety benefit of the MLI 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 MLI is made of robust metal, frequently the same as the vessel piping, making MLIs 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 MLI 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

MLIs 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 MLI over a sight glass gauge. Sight gauge level gauge 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 MLI permit visible level indication at distances up to 100 feet (30 meters) or greater. Newer, more advanced visual indicators, such as those from Orion Instruments®, have viewing ranges up to 200 ft. (60 m).

This article comes from magnetrol edit released

Magnetostrictive level gauge for high-precision cleaning requirements of the liquid level measurement, accuracy of 1mm, the latest product accuracy has been able to reach 0.1mm.

Can be applied to the boundary measurement between two different liquids. Magnetostrictive biggest advantage lies in the high resolution, can be done micron level. Explosion-proof intelligent electronic circuit design can calculate the volume

Magnetostrictive level gauge only movable parts for the float, maintenance is very low. Used in various types of storage tank level measurement environment adaptability and strong installation and other characteristics in short range measurement relative to the radar and other liquid level meter cost is very high, the function is also a lot.

The display has current, temperature, and interface display. This is the magnetostrictive level gauge can become today’s gas stations and other metering tank on the most commonly used one of the products.

This article comes from auto-instrument edit released

Level gauges are meters used to determine the level of a liquid in a fixed storage or process tank. The gauge is composed of several parts including head, float, measuring tape, bottom anchored bracket, guide wires, elbows, anchors, coupling, pipe support brackets, and pipework. Liquid level gauge calibration is used to ensure proper readings are obtained when using level gauges.

Level gauges have several advantages including durability for harsh environments, including the ability to withstand high pressure, temperature, and vibrations. They are easy to read from a distance and can be used in addition to a switch or alarm in a system. There is little maintenance required and all repairs can be done without disturbing the system. They can also be customized for extreme applications.

There are several basic types of level gauges. Examples include:

Tank level gauges – A tank level gauge is used in tank volume monitoring.

Fuel level gauges – A fuel level gauge provides a direct fuel level reading for vehicles and equipment. The two main parts of a fuel gauge are the sender and the gauge. The sender measures the fuel level in the tank and the gauge displays the level to the user. The sending unit measures the fuel once the float has dropped below a certain level. When the tank is full, the float is near the top and the wiper rests close to the grounded side. This means that the resistance is small and a relatively large amount of current passes through the sending unit back to the fuel gauge. As the gas level drops, the float also begins to sink and the wiper moves to increase the resistance and cause the amount of current sent back to the gauge to decrease. To watch an animation of this level system, click the image below.

Water level gauges – A water level gauge is used for measuring the rise and fall of water levels.

Mechanical level gauges – A mechanical level gauge monitors levels of underground storage tanks.

This article comes from globalspec edit released