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Level gauge is a device which is used to show the level of fluids in fields. Depending on the type of application used, the type of level gauge should be selected. Level gauge is a direct method for measuring the level. Level gauge consists of a metal body, machined to have an internal chamber and one or more front windows. On each window a special high resistance glass is used with sealing joint and metal cover plate hold by bolts and nuts.

Reflex glass level gauges working principle is based on the light refraction and reflection laws. When in operation, the chamber is filled with liquid in the lower part and gases or vapors in the upper. The reflex level gauges do not need a specific illumination. The day lwvel is enough for seeing the level. Therefore the rays incident within the critical angle are refracted within the liquid and, since the internal walls of the gauge chamber are not reflecting, the rays cannot be seen from the outside.

In fact the zone will appear dark, nearly black, to the observer. This zone appears silver bright to the observer. Reflex glass level gauges can be used in most of the fluids and applications. Reflex level gauges cannot be used in certain cases as for example:. Transparent level gauges are always fitted with two plate transparent glasses between which the fluid is contained.

The fluid level is levle as the result of the gayge transparency of the two media. To protect glass surfaces from corrosive action of the process fluid, Transparent Level Gauges can be fitted with Mica shields. The transparent level gauge is particularly recommended for applications where the glass needs to be protected from corrosive fluids and high temperatures.

Boat and stream questions high level gauge Sheet use in transparent level gauge: Boat and stream questions high level gauge sheet are widely used in visual liquid level to protect the glass surface from the corrosive effects of hot alkaline or acidic solutions. Mica shields are also commonly used in steam water applications to prevent etching and the weakening of the glass.

The Magnetic Level Gauge is used to preventive security against queshions, environmental safety, sure and trouble free application with chemically aggressive, pollutant, harmful or poisonous, inflammable or explosive, optically similar fluid interface.

The magnetic level gauge works based on some elementary physical principles:. There is a float in a gxuge chamber which is movement with level and up and boat and stream questions high level gauge accordingly. A flag flower is clamped with chamber. The individual flags Boat And Stream Questions High Level Difference or the follower contain an alignment magnet that couples with the float magnets as the float moves up or down within the piping column. Float movement rotates the flags and changes their color, the position of the follower, or point at which the flags change ane, represents the true level.

According to the orientation of each magnet each cylinder will show externally half of its surface of one colour or the. The indicating scale will be of one colour over the chamber area taken up by gas, or steam phase contrasting with the other colour e. It is necessary because if we taken level gauge directly then a temperature difference occurred and glass may be break and incident may occur. After this isolate the drain valve then boat and stream questions high level gauge the HP and LP valve and taken the level gauge in line and checked the leakage.

One point always remember that process person think that slide valve work as a normally isolation valve but this is not an isolation valve. Always kept slide valve in middle. Save my ans, email, and website in this browser for the next time I comment. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More.

Primary Menu Inst Tools. Search for: Search. Home � Types of Level Gauges. Previous Article. Next Article. Related Articles. Musa Bello March 25, at pm Educative. Leave a Comment Cancel Reply Save my name, email, and website in this browser for the next time I comment. Guest Articles. WordPress Image Lightbox. Send this to a friend. Send Cancel.

How much distance does he cover in 2 hrs during upstream? It takes him twice as long as to row up as to row down. Find the distance between two places? Parnab Mallick Read in Hindi. Question: Ramesh can row a certain distance downstream in 6 hrs and returns the same distance in 9 hrs. Please in hindi.

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