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Servo Tank Gauge is designed for use in custody transfer tank

Servo tank gauge with Water and Profiling option and inputs for Temperature Measurement

The servo tank gauge is a high accuracy gauge designed for use in custody transfer tank gauging applications. Our servo tank gauge exceeds the requirements of UK weights and measures standards for servo tank gauges.

Our servo tank gauge is a reliable, versatile and accurate automatic servo tank gauge, the servo tank gauge has been designed for ease of installation with minimal moving parts.

The servo tank gauge is designed to measure all kinds of liquid and can be situated either in free space or stillwells. The Servo can easily be linked to our tank gauging system or to an existing tank monitoring system.

The Gauge include the options to link the servo tank gauge to feature like temperature measurement (spot and average temperature are available) temperature profiling, full integration to management system, density measurement and much more.

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Update on Tank Gauge System

Tank gauge system and the application of it to oil lease tanks is not new. The historical problem has been finding a tank gauge system that provides all the necessary features to be able to fully control the tank and with most oil lease tanks this needs to be accomplished through a single opening. There are many technologies used for tank gauge system such as radar, guided wave radar, ultrasonic, servo, reed switch, and magnetostrictive.

When comparing the technologies, make sure to look at the needed features/specifications and compare the overall installed costs of the tank gauge system and not just the level transmitter. To adequately report inventory, you will need to monitor two liquid levels, temperature, and calculate volume. The first liquid level is the product level in the tank and, for oil lease tanks, this is the desired product of crude oil or condensate. The second liquid level is to detect or monitor the water level in the tank. The water level is needed to distinguish how much product is in the tank versus the overall level. A temperature measurement is needed for the volume calculation to be able to determine the net volume instead of the gross volume in the tank. Net volume calculations are used to remove the influence of physical expansion and contraction with temperature fluctuations. Without product level, water level, temperature, and volume, the tank gauge system is not able to fully monitor the tank.

Each tank gauge system is different as each uses a different technology and requires different equipment. The differences can add up to a large difference in the installed costs of the system. The installed cost includes any and all costs to install the system and receive the information in the control room. A partial list would include level transmitter, cable, conduit, secondary devices, auxiliary equipment, and/or specialty tools. Even if the level transmitters are comparable in costs, the installed costs of the system can vary by thousands of dollars. Be particular and research the details of each system and each technology.

Most of the level measurement technologies (radar, guided wave radar, ultrasonic, and servo) do not offer the ability to measure the temperature of the liquid without a secondary device. A secondary device could require a second opening and typically oil lease tanks do not have spare openings. The cost of tank modifications would eliminate the cost competitiveness of that system. For some of the technologies, the secondary device is a combination temperature sensors and water level/detection sensor, as the primary device can only measure one liquid level and this reduces the need for a third opening. The installed cost of these technologies is typically higher due to the extra equipment that is needed to complete the overall tank gauge system.

Out of all of the technologies only two, reed switch and magnetostrictive, can provide a product level, interface level for water detection, and temperature measurement from a single opening. These two technologies are going to offer a better installed cost as they do not require secondary devices or tank modifications. The difference between magnetostrictive and reed switch comes down to performance, as magnetostrictive level transmitters are more accurate, field repairable, and offer additional features such as volume measurement from the level transmitter and integral HI level switch.

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How does an automatic tank gauge work?

The automatic tank gauge offers the stability, security and simplicity your site needs to propel your business into the future. Our fuel level monitoring systems automate your fuel reconciliation and compliance reporting so that you have access to critical fuel site data at all times.

The automatic tank gauges are affordable wet stock management solutions that deliver accurate and crucial information. The automatic tank gauges are a great way for retail, aviation, or bulk fueling customers who may be using manual inventory management and reconciliation methods to begin taking advantage of automated reporting.

Magnetostrictive sensing technology is a major component to a complete fuel management system. Our MAG Probes provide underground storage tank owners the ability to measure height, liquid temperature, and detect water. Our TLS automatic tank gauges combine that data with proven leak detection algorithms to provide highly accurate in-tank leak detection, assisting operators with their daily, monthly and yearly compliance management.

Defend against catastrophic data loss and create a secure operating environment with the latest software upgrades for your automatic tank gauges.

Centralized Device Management (CDM) is a server-based software package providing remote access and control of automatic tank gauges within your entire network of sites.

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Density Meter Application Report

From purely an intuitive approach, it is easy to understand how a density meter can determine concentrations. If you were to measure the density of a pure water sample, you would find its density to be 0.9982 g/cm³ at 20ºC.

Now if you were to take 1g of NaCl (salt) and add this to the same pure water to make a 100 g solution, the resulting 1% solution of NaCl would now have a density of 1.0053 g/cm³ at 20ºC. Add yet another gram of NaCl and the 2% solution now will have a density of 1.0125 g/cm³ at 20ºC. If you were to continue this process, you would soon have a complete table of % NaCl vs. density at 20ºC. Subsequently, you are now able to find the concentration of an unknown NaCl solution.

The example above only discusses the concentration determination of NaCl. However, this same type of relationship is true for many commonly used solutions and many such tables already exist in the literature. But it is not too difficult to make new tables as required. This type of application is called a “two component” or binary solution; whereas chemical “A” is dissolved into chemical “B”. These chemicals “A” and “B” can be a solid dissolved in a liquid or a liquid dissolved into a second liquid. An example of the latter is the %Toluene in nHeptane. Using the DDM 2911, this analysis becomes extremely user friendly.

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Radar Tank Gauge for LPG LNG

The radar tank gauge for LPG LNG, GLA-310/F is designed to measure level in fuel tanks containing liquefied gases. Accurate measurement is possible regardless of the tank atmospheric conditions. Flexible hardware and software modules ensure easy adaptation for measurements in any kind of liquefied gases, such as LPG (Propane, Butane), LEG (Ethylene), and LNG.

The radar tank gauge for LPG LNG employs the Frequency Modulated Continuous Wave (FMCW) principle. A frequency sweeping microwave signal is emitted by the Radar through a stand pipe. The distance is derived from the time delay of the reflected signal from the liquid surface. The stand pipe is delivered to match the total tank height. The pipes have ventilation holes allowing the vapour pressure inside and outside the pipe to stabilize, thus allowing the liquid to rise or fall unimpeded in the pipe.

The electronic unit in the radar tank gauge for LPG LNG includes a unique signal detection method that ensures optimum performance. Combined with its superb signalto- noise ratio, GLA-310/F offers a high measurement reliability and accuracy.

Each tank gauge for LPG LNG is connected to a dedicated signal processing unit, which includes the processing of radar microwave signals and the intrinsically safe interface to the instruments located in hazardous area.

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Advantages of capacitive level gauge for marine users

Even the non-nautical amongst us can appreciate that one of the biggest problems with measuring the levels of fuel and water in vessels is that the sea is rarely flat. With the contents of the tanks seldom calm, obtaining a stable and accurate level reading can be difficult.

rough seas 300x201The most common marine based level gauge use floats that sit on the surface of the liquid being measured. This positioning exposes the floats to the turbulent motions experienced inside the tanks, resulting in inaccurate and unreliable measurement data.

No moving parts- accurate measurement

Capacitive liquid level gauge do not use a float and have no moving parts whatsoever. Instead they have a hollow probe which is immersed into the liquid and the actual level measurement takes place inside the probe. Using holes in the end cap of the sensor, liquid flows in and out from the bottom of the sensor where turbulence is at a minimum.

This provides a very significant suppression of surface level fluctuations as the submerged holes slow rapid changes in liquid level on the outside, which the sensor does not pick up. This all helps in providing an accurate, reliable and consistent level output from the sensor, letting you know exactly how much fuel is available in the tank whatever the sea conditions.

Solid-state capacitive technology also offers excellent long term reliability as there’s no mechanical linkages to break or wear out, outlasting other sensor types which would perish in the applications.

Continuous Output

Better still, capacitive level gauge also provide a continuous, ‘stepless’ output, as opposed to many float sensors which have a series of reed switches that require a significant level change to affect the output. This is because the fluid level has to change enough for the float to ‘de-activate’ one reed switch and ‘activate’ the next one along, thereby providing a ‘stepped’ or coarse resolution. The capacitive sensor generates a continuous output relating directly to the level of liquid inside the sensor with a very fine resolution, as it is not jumping from one switch to the next. Additionally, there is always the possibility that one reed switch could fail, resulting in a large measurement ‘dead spot’ on the sensor.

Adaptable Installation

The sensors can be used with metal and plastic tanks and for the awkward shaped tanks, they do not have to be installed vertically-indeed, they can be mounted up to an angle of 60° from vertical without modification, to help cover the full depth of an irregular tank shape. Capacitive level gauge can also be used on a variety of liquid types.

The advantages of capacitive sensing technology can also be utilised across a range of harsh environment applications to provide long-term cost effective reliability, further advantages of Gill’s Marine Liquid level gauge are highlighted in the video below.

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Outlining the working principles of a level gauge

They operate on the principle of communicating vessels, which refers to separate containers that are connected via extrusion outlets to allow low- or high-density fluids of either homogenous or heterogenous consistencies to flow between the vessels.

The chamber, or auxiliary column, of the level gauge is equipped with a float containing a set of permanent magnets. Fluctuations in the fluid of the primary chamber will result in commensurate changes within the level gauge. The magnetic float rises and falls on the surface of the fluid, registering these changes on the external measurement indicator. This indicator is typically constructed using a magnetized shuttle that moves in conjunction with the interior magnets.

This technique is advantageous as it does not require restrictive mechanical guide rails and instead relies on the limited lateral motion of the float within the column of the level gauge. It is also suitable for fluid mixtures of varying densities, with variable float designs and materials suitable for the specific gravity of numerous measured fluids, including acids, butane, oils, water, and heterogenous fluid interfaces.

level gauges are increasingly preferable to alternative level measurement systems owing to their improved thermodynamic resistances over apparatuses such as sight gauges. They can withstand high process temperatures and are optimized for high pressure applications. Unique process demands can also be met using bespoke level gauges with oversized columns and floats with improved buoyant characteristics.

This article comes from ABB edit released