Level gauges with glass tube

Level gauges with a glass tube are an inexpensive but valid option for checking the level of non-hazardous or non-reactive fluids in unpressurised tanks. An external metal protection of the glass tube is recommended.

The level is ascertained using a glass which has a smooth side and a wetted prismatic side. The level of the fluid inside the level gauge is shown by using the optical principles of refraction: the wetted part fully absorbs light and so the fluid appears to be black. The part in contact with the gas, on the other hand, fully reflects light and so the gas appears to be of a very light colour.

In this kind of level gauge, the fluid is held between two smooth glasses. The level can be identified as the fluid has a different level of transparency compared to gases and steam.

The transparent level gauge is particularly recommended for applications where the glass needs to be protected from corrosive fluids and high temperatures. A lamp can also be fitted behind the gauge to improve visibility in special operating conditions.

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General Description of Level Gauge

Transparent Liquid Level Gauges use the T-form sight glasses, designed and built for a wide range of high temperature and high pressure applications.

Our transparent level gauge is used to make observation of the level of corrosion-proof and chromatic liquids. These types are utilized two pieces of tempered flat gauge glasses. In front and rear of which are enclosed with a gauge cover using stud bods.

Where high temperature and corrosions are liable to occur, it can be furnished with a mica shield to prevent it from being corroded. There types are preferably used for reservoir tanks that require a relatively long visible length by constructing the supporter.

The transparent level gauge is assembled firmly with gasket, transparent glass, cushion gasket and gauge cover on the body by stud-bolts for all STG series.

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The Benefits of Automatic Tank Gauge

Utilizing an Automatic Tank Gage has perfectly replaced the manual dip-stick measuring as the preferred stock control answer for retail fuel sites with underground fuel storage tanks. An automatic tank gauge can be linked to probes and electric line leak detectors over various tanks to manage a whole fuel site’s inventory. The tank probes precisely measure the amount and temperature of any fuel or water in a tank and report it back to the automatic tank gauge.

Benefits of an Automatic Tank Gauge

Stock Control

Fuel site proprietors utilizing an automatic tank gauge can precisely assess the amount of fuel at present available for dispensing in each tank. By checking the inventory every day, a proprietor is able to comprehend their site’s business cycles, how much stock they require on hand, and when they have to schedule deliveries. Tight inventory control can help pick-up fluctuations in fuel amounts that may be caused by erroneous deliveries, malfunctioning equipment, or theft. In many states there is an administrative prerequisite that owners report their ten day inventory reconciliation.

By connecting all the automatic tank gauges on a fuel system to the Liquid Automation Systems, owners can see the inventory status and differences of every one of their sites at once. The cutting edge reporting features allows further insight into stock cycles and delivery scheduling over the whole system.

Leak Detection

The SABS orders that each fuelling site perform some strategy of leak detection and file a passing outcome once every month. An automatic tank gauge can perform this test by taking product level and temperature readings almost constantly for a set timeframe to figure out whether a changing product level might be because of a leak. Some automatic tank gauges perform Continuous Statistical Leak Detection (CSLD) by taking stock readings throughout the month at whatever when point there is no pumping action. The framework statistically examines the information to figure out whether the tank is tight or leaking.

When all the automatic tank gauges on a fuel system are connected to Liquid Automation Systems, a proprietor will consequently get an alert if any sites on the network detects a leak. The proprietor will likewise have leak test results readily available.

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Magnetic Level Gauges & Accessories

Side-mounted magnetic level gauge can be used to measure level of various vessels in the shape of tower, kettle, groove and ball as well as boiler furnace. It can be used in complex conditions, such as high-sealing, leak prevention, high pressure, high temperature and corrosion. In the measurement process, no measurement blind area. It strikingly displays the level and has a wide measurement range.

Compared with traditional glass plate level gauge, it is safer, more reliable, more advanced and more practical. The most obvious characteristic is the complete isolation of liquid medium and indicator so it can be used safely, reliably and durably in any case. Level gauge meter equipping with liquid level alarm, control switch can control and alarm the highest and lowest level.

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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.

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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.

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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.

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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