Principle animation of servo gauge

Servo gauges are designed to detect the difference in refractive indices of vapor and liquid and level detection and can be used in a number of process applications.

Servo gauges are commonly used for level detection within a specific vessel, and the primary principle is based on the difference in refractive indices of vapor and liquid.

Reflex gauges, also referred to as prismatic servo gauges, offer a well-defined image of water levels. This reduces risks of distortions or reading areas. Because of this, a servo gauge can be installed in a tilt-view or vertical position to produce even greater accuracy in readings along with a much better degree of reliability. As imagined, this is highly beneficial for many industries.

This article comes from controleng edit released

How to change a level glass of a Level gauge

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.

This article comes from inst tools edit released

Bi-color level gauges

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.

This article comes from thomasnet edit released

Types of Liquid Level Gauges & Level Indicators

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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Process Control and Tank Terminal Automation

Tank terminal automation system provides monitoring, control and management of the entire product handling process, right from receiving to storage to distribution. Our terminal and tank farm experience includes products such as crude oil, refined oil, liquefied natural gas, petroleum gas and chemical tank farms; utilizing loading systems for ships, trains, trucks and pipelines.

With data integration as the tank terminal automation system’s core, our solution combines automatic control and business management functions, and helps reduce cost of execution and improves productivity, efficiency & safety.

Business Problem

As tank terminal automation operation volume continues to grow throughout the world, terminals are seeking ways of improving the productivity and efficiency with which they meet customer requirements. Today’s tank terminal automations are expected to handle increased volume, larger vessels and greater capacity. Tank terminal automation operators need to streamline their business processes in order to stay competitive and profitable.

Solution Description

Tank terminal automation system provides monitoring, control and management of the entire product handling process, right from receiving to storage to distribution. Our terminal and tank farm experience includes products such as crude oil, refined oil, liquefied natural gas, petroleum gas and chemical tank farms; utilizing loading systems for ships, trains, trucks and pipelines.


With data integration as the tank terminal automation system’s core, our solution combines automatic control and business management functions, and helps reduce cost of execution and improves productivity, efficiency & safety.

This article comes from intinfotech edit released

Variants Of Level Gauges And Their Construction Or Working

Conservation of any liquid including water can be done only by precise monitoring of its level. Water is the simplest and most indispensable liquid fundamental to human existence.

We use it extravagantly in our day to day lives, but do we actually worry about the amount of water we need for the particular the purpose? Such unnecessary waste of water creates scarcity and also has bad effect on our environment. Monitoring water level, and thereby its consumption, can help in its conservation.

The estimation of quantity of liquid and its consumption/conservation can be monitored using level gauges. Level gauges showcases a wide range of level gauges for liquids, which will make your liquid level measurement easy and meaningful.

Level gauge for liquids consists of glass tube fitted between two end blocks. The guard, ‘C’ channel or tie rod is provided to protect gauge glass & prevent it from accidental blows.

This article comes from punetechtrol edit released

What is a magnetic level gauge indicator?

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.

This article comes from vega edit released

Tank Terminal Automation and Control

We utilizes specialized data points to automate and control tank farm equipment, increasing safety and improving

Combining new tank terminal automation features with existing inventory management functionality in the same system reduces the complexity of your operations, simplifies IT support requirements, and improves productivity.

This article comes from varec edit released

Features and advantages of magnetic level indicator

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

Tank Terminal Automation Advantages

Complete solution from receiving products through to storage and delivery from a certain location

Be it edible oils, chemicals or petrochemicals: Successful tank terminal automation control relies on accurate and reliable process measurements such as level and flow. From high accuracy tank gauging through to the transfer of highly viscous products, we are the perfect partner to help you select the most appropriate device. But process measurement is only the start.

Truck and rail car loading

In addition to many years of providing accurate mass flow meters to the industry, we also manage the complete process of loading as well as managing the process automation needs of your tank terminal automation. By using proven technology and our professionals for designing and building loading skids, we provide reliable and effective tank terminal automation which enables you to successfully control your tank terminal automation.

Safety instrumentation

We go beyond of simply supplying the instruments you need to prevent overfill incidents. The entire safety loop system including measuring, controlling and correcting elements are provided from one source in order to ensure that you remain protected. Our systems include alarm panels, designed and built to meet exactly your requirements. If necessary the arrangement for SIL safety audits can be carried out that take into account your complete operational processes.

This article comes from endress edit released