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ATG Servo Advanced Tank Level Gauge

ATG servo tank gauge is a reliable, versatile and accurate automatic servo tank gauge with a minimum of moving parts, designed to measure all kinds of liquids in any type of storage tank. ATG servo tank gauges are compact and need only a 2″ mounting flange.

They can easily be integrated with existing SmartRadar, hydrostatic or hybrid gauging installations. The modular ATG servo tank gauge supports features like temperature measurement spot and average product temperature and product temperature profiles, full integration in a hybrid inventory management system, analog level output, density measurement, product interface, water/product interface measurement.

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Servo Tank Gauge – Accurate Level Gauging for Custody Transfer & Inventory Control

Tank gauging is essential for the assessment of tank contents, tank inventory control and tank farm management. Portfolio of high-end radar & servo tank gauges help in accurate level gauging for refineries, tank terminals and petrochemical industries. Servo Tank Gauges are suitable for custody transfer as well as inventory control and are designed to be used in SIL-2/SIL-3 loops to prevent spillage.

The current servo level gauging technology includes the Advanced Tank Gauge (ATG) and the Xmitting Tank Gauge (XTG). The ATG and XTG series microprocessor-controlled servo gauges are compact and need only a 2″ mounting flange. The servo level gauges can easily be integrated with existing SmartRadar, hydrostatic or hybrid gauging installations.

How Does It Work?

Advanced Tank Gauge (ATG)

Designed for measuring all kinds of liquids in any type of storage tank, the series 854 ATG Servo Gauge is a reliable, versatile and accurate automatic tank gauge with minimal moving parts. The multi-functional instrument is modularly constructed. The option slot for additional features allows the connection of temperature measuring elements for spot and average product temperature, as well as product temperature profiles.

Xmitting Tank Gauge (XTG)

The 854 XTG Servo Gauge is a superior alternative to mechanical float and tape gauges or other low-cost level measuring devices. The standard field-proven two-wire correction of tank deformation, roof movement, drum deviation, wire weight and displacer fieldbus is utilized for connection to remote indicators, tank inventory systems and host systems.

What Problems Does It Solve?

​The Servo 854 is equipped with a Servo Auto Test feature which increases its safety, integrity and diagnostic coverage; enabling the servo level gauge to be used in overfill protection loops to prevent spillage. The increased diagnostics detect failures inside the level gauge or in the application and report this to higher level systems for further action. Additionally, the safety proof-test interval can be extended to 5 years, significantly bringing down operational costs.

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Servo Tank Gauges Working Principle

Servo tank gauges is the generic name given to the measurement of liquids (product) in bulk storage tanks with the aim of quantifying how much product is in the tank, “gauging the contents of a tank”. Today, the oil & gas industry uses the static measurement of the tank contents to account for product stored and product moved into and out of the tank.

There are many instruments and systems available that can provide the combination of measurements that will allow an accurate quantity assessment and, hence, good inventory management. In Practice, we use both Radar and Servo Level Transmitters for Tank Gauges.

Servo Tank Gauges Principle

The Servo tank  gauges system is based on the principle of displacement measurement. A small displacer is accurately positioned in the liquid medium using a servo motor. The displacer is suspended on a measuring wire that is wound onto a finely grooved drum housing within the instrument.

The drum is driven via coupling magnets, which are completely separated by the drum housing. Outer magnets are connected to the wire drum whilst the inner magnets are connected to the drive motor. As the magnets turn, the magnetic attraction causes the outer magnets to turn as well, resulting in turning the entire drum assembly. The weight of the displacer on the wire creates a torque on the outer magnets generating the change of magnetic flux. These changes generated between the drum assembly are detected by a unique electromagnetic transducer on the inner magnet. The drive motor is actuated to balance the voltage generated by the variations of magnetic flux to equal the reference voltage defined by the operating command.

When the displacer is lowered and touches the liquid, the weight of the displacer is reduced because of the buoyant force of the liquid. As a result, the torque in the magnetic coupling is changed and this change is measured usng Hall sensor, which are temperature compensated. The signal, an indication of the position of the displacer, is sent to the motor control circuit. As the liquid level rises and falls, the position of the displacer is adjusted by the drive motor. The rotation of the wire drum is precisely evaluated to determine the level value, which is accurate to an outstanding +/‐ 0.7 mm.

This article comes from instrumentationtools edit released

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