Global Fuel Tank Gauging System

Success is not final, failure is not fatal; it is the courage to continue that counts.– Winston Churchill

Magnetostriction

We all know that substances expand with heat and contract with cold. Besides heat, magnetic field and electric field can also make objects longer or shorter. Ferromagnetic substance can become longer or shorter under the exterior magnetic field, when the magnetic field is removed, it restores. Magnetostriction is a property of ferromagnetic materials which causes them to expand or contract in response to a magnetic field.

Magnetostrictive Level Sensor construction

Main parts of the magnetostrictive level instruments are:

– Sensor:

– Magnetic float:

The main part of the magnetostrictive instrument is the Float centered around a long metal rod, which is called as the waveguide. The waveguide is hung from the top of the vessel, which is long enough from the top to bottom.

Waveguide: Rod, which has the full length of the vessel.

Magnetostrictive Level Sensor working Principle

The magnetostrictive level transmitter uses buoyancy, magnetostriction and electronics technologies to accurately measure the level of a wide variety of liquids, including interface multiple liquids with a two-float design.

In the magnetostrictive level transmitter a float with permanent magnets sits on top of the fluid to be measured, and it acts as a position transducer (properly sized for the specific fluid density), is mounted on the level transmitter stem such that the float will travel up and down due to the buoyancy of the float from the fluid being measured.

The wire, made of a magnetostrictive material, is fixed inside a guided tube.

In magnetostrictive level measurement, a low-energy pulse generated by the electronic circuitry travels the length of the magnetostrictive wire produces a circular magnetic field. The interaction between the magnetic field of the magnetostrictive wire and the magnetic field created by the float’s permanent magnets generates a torsional strain pulse that travels at approximately the speed of sound along the wire. This pulse travels back to the magnetostrictive level transmitter electronics. A small induction pickup coil senses the strain pulse. The position of the float is determined with high precision by measuring the time between the launching of the current pulse and the arrival of the torsional strain pulse.

A timing circuit exists within the electronic circuit which measures the time between start of the current pulse and returned torsional strain pulse. Each cycle occurs ten times per second, providing real-time and highly accurate level data. In this manner the float’s location (the fluid level) is very precisely determined and presented as a level signal by the magnetostrictive level transmitter.

GFTG magnetostrictive sensors can work in mobile machine tanks and underground tanks. Level sensors are designed for harsh operating conditions high temperature, high pressure and strong vibration. It can also use for detection of leaks in underground storage tanks.

These sensors are extremely accurate and work well for a wide range of fluid temperatures, process connections, stem lengths, and float dimensions ensure there is one configuration that fits your particular application.

Level measurements made using magnetostrictive float technology are not impacted by foaming, bubbles, boiling, vapors, condensation, pressure, temperature changes of liquids.

Advantage of magnetostrictive liquid level sensor:

1. High Reliability:

Magnetostrictive liquid level sensor is on the basis of waveguide theory and without mechanical parts, so it is free of friction and wear. The whole convertor was sheltered in the Aluminum tube, non-contact with measuring medium. So, it is reliable and enduring.

2. High Accuracy:

Magnetostrictive liquid meter is on the basis of waveguide pulse, it measures the replacement by the time of initial pulse and terminal pulse, so its accuracy is very high.　Resolution ratio is better than 0.01% FS, which is beyond other sensors.

3. Safety:

Anti-explosion function of magnetostrictive liquid meter is satisfactory. With intrinsically safe explosion-proof, it is very safe. So, it is particularly qualified for measuring of chemical material and flammable liquid.

4. Easy installation and maintenance:

Generally, magnetostrictive liquid meter can be installed through existing orifice on the tanks, particularly convenient for the sunken tank. Magnetostrictive level transmitters offering accuracy, safety and reliability even in the harshest environments.

Installation and mounting Considerations

v First, slide float onto probe. Orientation of the top & bottom of these floats is not required since the magnet is located in the middle of the float.

v Next, slide the float spacer onto the probe.

v Now, slide the dead band float spacer onto the probe.

v Finally, capture the components on the probe with the float retaining E-clip.

Mounting considerations may vary depending on the application. For underground tanks, the probe is generally mounted in the riser, resting on the bottom of the tank. Spacers are used to hold the sensor in the riser and a cable is suspended from the tank cap.

Since the sensor requires a float to provide level position, there is a minimum process connection size required for insertion of the float into the tank. It is recommended that a minimum of 2” NPT be used for the most reliable system.

The size and material of the float being used will have a slight impact on the overall accuracy of the measuring system. In general, the larger the float the easier it is to provide a high accuracy measurement.

Note: Product level floats must be installed prior to an interface level float. If using with an interface float do not install the float dead band spacer below the product float.

Specifications:

• • • • Operating Voltage: 9 - 30 VDC

    • Consumption: <150mA @12V

    • Resolution of fuel level: +/- 0.1mm

    • Standard accuracy Level: +/- 0.5mm.

    • Resolution of volume: 2liter @ 50000 liter tank.

    • Temperature Range: -40°C to +70°C (+/- 0.5 °C).

    • Temperature resolution: ± 0.1 °C.

    • Response Time: 300m Second (Approximately)

    • Measuring range from 500mm to 15000 mm.

    • Aluminum enclosure: IP 68, Protection up to 50 m/24h water submersion.

    • Aluminum pipe outer diameter: 22mm

    • Floats: 316SS floats Typical to 350 psi, Ø 42 / 52 mm.

    • Maximum mechanical length: standard length 12f 00 mm (Can be extend up to 15M).

CAUTION!

Part of the equipment enclosure is constructed of non-metallic material; to prevent the risk of electrostatic sparking, the non-metallic enclosure material should be cleaned only with a damp cloth.

I. PRICES: All prices are subject to change without notice in the event of any changes in cost of materials or labor, specifications, quantities, delivery schedules, customs duties, other factors beyond Seller’s control.

II. DELIVERY: Delivery dates are approximate and are dependent on prompt receipt by Seller of all necessary information. Seller may deliver all or any part of Products/ Services as early as 30 days in advance of agreed schedule.

WARNING!

If the GFTG System is located in a hazardous environment, do not open the enclosure cover or make / break any electrical connections without first disconnecting electrical power at the source. Ensure that wiring, electrical fittings and conduit connections conform to electrical codes and Approval Agency Control Drawings for specific location and environment.

WARRANTY

• • • When installing probes, do not bend the probes, permanent damage may result.

    • Probes are sealed at the factory and have electronic circuits inside. Do not attempt to open probe or weld the tube.

    • GFTG System is designed for industrial applications, but should be mounted

    • in a location as free as possible from vibration, corrosive atmospheres, or any possibility of mechanical damage.

    • Mount the probe in a vertical position

    • Float should have free movement along probe.

    • First six months are under warranty and every problem in this system will be resolved free of cast.

    • After six months maintenance plan will be made with mutual understanding.

What Is A Fuel Management System?

Fuel-management systems are used to maintain, control and monitor fuel consumption and stock .Fuel-management systems are designed to effectively measure and manage the use of fuel.

An automated fuel management system gives much higher level of accountability, 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.

FUEL TANK GAUGING SYSTEM

The magnetostrictive level transmitters are based on the principle named Wiedemann effect and enable continuous and highly accurate reading of liquid’s level. The level transmitter consists of a microprocessor based electronic circuit placed inside one aluminum case head and a stainless steel shaft containing a wave guide placed inside the tank.

GFTG Level sensors are high precision measure instrumentation which are suitable to measure product level, water level and temperature in various type of underground and above ground tank,

WORKING

An high frequency electric impulse is transmitted through the electronic device. In the matching point with the magnetic field generated by the permanent magnet placed inside the float, a mechanic impulse is generated thanks to the magnetostrictive torsional strain. The mechanic impulse spreads through the wave guide to the speed of sound up to the sensor placed in the measuring head. The timing between the transmission of the going impulse and the return impulse exactly defines the position of the floats.

General features

Automatic Tank Gauges is used for monitoring level, volume and temperature for liquid petroleum inside tanks. It is widely used at gas station, filling station.

Internal sensor replacement without removing rod from the tank.

Connection to the tank: fixed or adjustable thread/flanged/inside riser.

Stainless Steel shaft.

• • Very high accuracy and repeatability

  • Sharp leakage control

  • Full stainless steel execution

  • Ultra compact design

Intrinsically safe or explosion proof versions

Commonly used in the fuel level control, it allows the measure of the three essential parameters:

• • Fuel level

  • Water level on the bottom of the tank

  • Fuel temperature

• Operation of the sensors is free from the influence of: Density, Dielectric Constant, Electrical Resistance, Temperature, Chemical Composition (additives), Dirt Deposit (diesel) Submersible Pump, Surface Waves, Vapors, Sediments and Mechanical Impacts/Vibrations.

• Industrial design, long service life, fast in running.

• It can monitor up to 12 tanks and display dynamically the product level and water level with colored graphics in proportion.

• After connected with Central Control System though internet, it can provide information for manager to manage the inventory, delivery and the sale of the product.

• Integrated design for the safety barrier and control console in order to easy installation and lower the cost.

• This advanced solution was the dream in the past years.

Automatic Diesel Fuel Tank gauging system

AFTG is an Automation System for accurate measuring and continuous monitoring of Fuel Level, Water Level, and Temperature into under ground tanks in Petrol Station’s.

Fuel tank level gauge consist of Magnetostrictive probe and Touch screen control console.

• A magnetostrictive probe installed in the tank, with magnetostrictive technology, can accurately measure the fuel level ,water level and multiple temperature.

• Touch control console installed in the petrol station control room, it can automatically probe data acquisition and processing, real-time display tank storage information, realize the tank leak detection, automatic unloading, record query, data upload and control multi-channel underground tanks.

• Operating principle of Magnetostrictive liquid level gauges

• The operation of Magnetostrictive Level Probe is based on the principle denominated Wiedemann effect and allows a continuous and highly accurate reading of the level of liquids inside a tank.

• The level transmitter consists of an electronic circuit with microprocessor located in the head and of a stainless steel rod housing a wave guide located inside the tank.

• A high frequency electric impulse is generated by the electronic device. In the exact point of intersection with the magnetic field generated by the permanent magnet housed in the float, a mechanical impulse caused by the magnetostrictive torsional deformation is generated. The mechanical impulse travels at the speed of sound in the wave guide up to the detector located in the measuring housing.

• By measuring of the time elapsed between the sending of the initial signal and its return the exact position of the floats along the rod is defined with 0.01 mm resolution.

Secure data handling

Customized User Access enables the configuration and deployment of company specific security controls and procedures. SSH (Secure Shell) cryptographic network protocol utilized to ensure secure access to remote machines.

User friendly operation

Compatible with existing Veeder-Root sensors and probes and includes easy to use customized home screen and favorites save operator response time. Stores your data for up to 3 years to protect critical information.