JOYO M&C – Servo Tank Gauge Manufacturer & Suppliers

Following steps to be taken to change the glass:

1. Isolate the level gauge from process from HP and LV valve.
2. Drain the level gauge process fluid from drain isolation valve.
3. Insure no leakage occurred from HP and LP valves.
4. Remove the all U-Clamp bolt and removed the glass and gasket and make smooth the surface of chamber and cover flange surface.
5. Fix the sealing gasket after some grease applied on chamber window surface. By applying the grease it is easy net time to remove the gasket on next time.
6. Fix the mica sheet in case of transparent glass.
7. Fix the glass then fix cover flange and cushion gasket then fix the U-Clamp and bolt .
8. Tighten the bolt in cross direction. Never tighten the bolt in one direction if tight the glass one direction then possibility to break the glass.
9. Tighten the all U-clamp bolt equally.

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For cases where it is desired to measure the level of water in a boiler or steam generator application, a bi-color level gauge is often utilized. The device consists of a set of light emitters such as LEDs, and optical filters, one red and one green, that send light into the level gauge chamber through the water/steam towards the level gauge glass and the observer.

The optical principle at work is that different colors of light (which represent specific frequencies and wavelengths) have a different index of refraction when they pass through different media. When the level gauge chamber contains steam, the green rays of light deviate significantly and as a result, the observer sees red light on the level gauge glass. Similarly, when the level gauge contains water, the red light is deviated from reaching the observer while the green light passes through. Hence the level of water in the boiler can be established as a result of this color change observed from the variation in index of refraction. Green represents liquid water and red represents vapor or steam.

Bi-color level gauges may consist of a long glass or a series of portholes of exposed glass.

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Gauge Glass

Plain glass tube level gauges, also known as sight glass or gauge glass, are tubular glass gauges that are not encased in metal plates. These tubular gauges come in a clear color or with a red line, which improves the visibility of clear liquids. Tubular gauges come in many different diameters and lengths, which are often custom cut to the client’s specifications. Finishes on the ends of tubular glass gauges are seen cut, ground, or polished depending on client specifications. Tubular Glass Gauges are often used in low-pressure applications up to 600 psi.

Transparent Level Gauges

Transparent gauges contain the liquid medium between two pieces of glass on opposing sides of the chamber. Light shines through one side of the gauge, and the level is viewed from the other side. The fluid level is indicated as the result of the different transparency of the two media. Transparent Level Gauges can be purchased with tubular glass or flat glass. While tubular glass is more cost-effective, flat glass designs can better withstand applications with high pressures.

Transparent gauges are a good choice in applications where the actual liquid characteristics need to be seen, as well as with liquid to liquid interfaces and applications with repetitive thermal shock. They can also be used when corrosive liquids are present with the addition of mica shields. Mica shields are used when acidic solutions or hot alkaline are present to protect the integrity of the glass.

Reflex Level Gauges

Reflex glass level gauges work off light refraction and reflection. The glass has several grooves for reflecting prisms. The liquid level is easily identified with different brightness levels of the glass in the liquid and no illumination is required to view the liquid level.

Reflex Level Gauges allow for a better view of clear liquids because they are equipped with special optics that make the liquid visible. Reflex level indicators are often used in high-temperature applications, specifically for boiling liquids. Boiling liquids levels can be hard to read with other types of level gauges since their bubbles make the surface level questionable. The manual adjustment of the isolation valve as the process fluid enters the chamber reduces the bubbling. Reflex Level Gauges are also suitable in applications with high pressures and corrosive process fluids. Reflex level gauges are not suitable for when the interface between two liquids needs to be read.

Magnetic Level Gauges

A magnetic level gauge, or magnetic level indicators measure fluid levels by utilizing a float that rises and falls with the fluid level. The moving of the magnet assembly adjusts a series of bi-color magnetic flags that provide a visual indication of the liquid level. The mechanics of these level indicators are simple are require no power source yet are very effective and reliable at recording liquid levels. They are also virtually maintenance-free, and the magnetic force can affect optional switches or transmitters mounted outside of the chamber.

Magnetic level gauges are used as security against leakages when process fluids are chemically aggressive, poisonous, inflammable or explosive. Magnetic level indicators can be used in a wide variety of applications and are considered alternative to glass gauges.

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A magnetic level gauge indicator is an externally mounted chamber with visual indicators that are completely isolated from the process liquid. Inside the chamber is a magnetic float that rises and falls with the level gauge of the liquid. When the float moves, it causes flags inside the chamber to turn and mark the level gauge on an exterior indicator numbered roughly like a meter stick. Magnetic gauges are often used in conjunction with through-air or guided wave radar as a redundant level gauge measurement.

Magnetic level gauge transmitters were initially introduced as alternatives to sight glasses. Over time, glasses become compromised through leaking seals, clouding, and breakage; level gauge technology is not susceptible to these weaknesses.

What are the advantages of using a magnetic level gauge transmitter?

The chief benefit of using a level gauge is isolation from process liquid. Separation allows for easy access to the level gauge for cleaning and eliminates contact with difficult media. Magnetic level gauge indicators are commonly low-cost in comparison with other level technologies, and can provide visual indication of level gauge from a distance. In fact, magnetic gauges make level gauge visible from up to 200 feet away.

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Features of magnetic level gauge:

Magnetic flap level gauge indicates the material level is very intuitive eye-catching. As the flap on both sides were white and red. Both colors have high contrast. Daytime in the distance you can see the liquid level display flap position, at night with indoor and outdoor lighting is also easy to judge the location of the liquid level.

Magnetic flap level gauge can be applied to a variety of liquid level display.

For larger viscous liquids, a larger diameter standpipe and magnetic float can be used. For liquids with smaller viscosities, a smaller diameter standpipe and float may be used.This can avoid the blockage of materials, do not produce false level. For different density of liquid, respectively, design the size of the float according to the density of the liquid, so that the magnetic float in the liquid can be free to float.

Magnetic flap liquid level display accurate, flexible, safe and reliable, applicable to all kinds of pressure vessels.

Three advantages of magnetic level gauge:

Very high sensitivity and vision is also very wide. Field instructions output remote signal(4 ~ 20mA or HART).

A variety of liquids and high temperature, high pressure, corrosive and flammable and explosive liquid level of continuous measurement.

Magnetic flap level gauge can work at the conditons of high temperature and high pressure, and it also has a certain degree of corrosion resistance, thus greatly increasing the life of magnetic flap level gauge. At the same time, the body tube of the magnetic flap level gauge use seamless steel pipe, connecting pipe at the use of hole welding, no internal scratches.

When using magnetic level gauge, it has the feature of intuitive, eye-catching, wide viewing angle, compact and reasonable, and it is very safe and reliable. There is no blind spot in the measuring range.

This article comes from vacorda edit released