Saab Tank Control representative:

Transcription

1 Saab Tank Control representative: HEADQUARTERS: Saab Tank Control Box SE Gothenburg SWEDEN Tel: int Fax: int sales.stc@marine.saab.se WEBSITE: Find your local representative on website Third edition. February Ref. nr E

2 The ultimate radar level gauge POWERFUL, COMPACT AND SMART. A TANKRADAR. ALWAYS ON THE LEVEL

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4 A technical breakthrough that will change your mind New state-of-the-art radar level gauge Developed for the process industry Accurate and extremely reliable Easy to install and to use Affordable for everyone Imagine a new, revolutionary radar level gauge that is accurate and extremely reliable in a wide variety of applications and environments. Compact, easy to install and use, maintenance-free (everything you would expect from a state-of-the-art Saab solution) at an affordable price. Right, you ve just thought of the latest innovation from Saab Tank Control Saab TankRadar Pro. The new generation of radar level gauges from the world s leading manufacturer of radar level gauging equipment. Developed for the majority of tanks in the process industry. Saab TankRadar Pro is smaller, lighter and more flexible than its predecessors, yet it is smarter and has higher sensitivity making it more reliable too. This is the product that will definitely change your mind about level gauging. All technical details are subject to change without prior notice. 3

5 Advantage Saab TankRadar advantage you Saab TankRadar Pro features and benefits: OUTSTANDING RELIABILITY not affected by tank conditions high accuracy (± 5 mm) NO MAINTENANCE no moving parts internal automatic calibration EASY TO USE interactive set-up adaptive and intelligent LOW LIFE-CYCLE COST modular design no maintenance long lifetime Radar gauging superior reliability and accuracy Saab TankRadar Pro provides outstanding reliability. The gauges have no moving parts and the only part inside the tank is the antenna. Saab TankRadar Pro uses the noncontact measurement technique radar for trouble-free and maintenance-free operation. This results in a competitive and costeffective solution for level gauging applications. 4

6 The radar waves are almost unaffected by dirt on the antenna, tank atmosphere, regardless of liquid type in the tank, its temperature or pressure. That is a big advantage compared to other types of noncontact level measurement techniques such as ultrasonic and laser. Saab Tank Control: Inventors of radar level gauging More than units installed since 1975 Market leaders in radar level gauging Well-known for delivering the most reliable radar level gauges in the market World wide sales offices and technical support Sensitivity the key to success The high sensitivity of Saab TankRadar Pro makes it suitable for a vast range of products and tanks. No matter the height of the tank or if there are turbulent surface conditions, Saab TankRadar Pro will continue to perform consistently and predictably. When talking about sensitivity we are actually describing the signal/noise ratio of the measuring equipment. The higher the ratio the more precise and reliable are the readings obtained. The new TankRadar Pro series has an outstanding signal/noise ratio (sensitivity) with an accuracy of ± 5 mm. 5

7 If you have the application, we have the solution Three basic Saab TankRadar Pro versions Lite, Standard and Gold offer complete coverage of most level measuring applications. And of course you can get your own customized version for very special requirements. The choice has never been easier. Saab TankRadar Pro Lite Designed for tanks without internal structures outside hazardous areas, for example storage tanks. Saab TankRadar Pro Lite uses Fast Fourier Transformation (FFT), one of the most widely used signal processing techniques, to ensure rapid level measurements level with an accuracy of ± 10 mm. The Lite version can optionally be equipped with Saab s echofixer, FHAST for increased accuracy and MET, as well as various antennas. Saab TankRadar Pro Lite. Perfect for storage tanks. 6

8 Saab TankRadar Pro Standard The Standard version of Saab TankRadar Pro is suitable for most tanks, even those with echo-disturbing internal structures, for example tanks with agitators or baffles. It is also suitable for spherical and bullet tanks. This version uses FFT with the addition of Saab s echofixer. Saab s echofixer is a package that continuously maps out all radar interference sources. This gives a reliable level measurement also in agitated tanks. most tanks, also tanks with multiple agitators, beams, heating coils and other sources of false echoes that can seriously compromise level gauging accuracy. For example in agitated batch tanks, and other tanks where higher accuracy and resolution is required. Saab TankRadar Pro Gold includes FFT, Multiple Echo Tracking (MET ), Saab s echofixer and FHAST as standard. An agitator can present a complicated series of false echoes when the liquid is at the same level as the agitator. In such a situation the MET enhancement enables the sensor to consistently identify the correct echo. MET further increases the radar echo resolution around the disturbing echoes. Saab TankRadar Pro Standard. Perfect for agitated tanks. Saab TankRadar Pro Gold The Gold version of Saab TankRadar Pro is the most advanced version with an operating accuracy of ± 5 mm. It is suitable for Saab TankRadar Pro Gold performs accurate measurements in tanks with agitators, and with improved resolution around disturbances. 7

9 Saab TankRadar Pro Antennas Rod antenna ä For tanks up to 5 meters. ä 2" or larger tank connections. ä Only PTFE exposed to tank atmosphere. ä Hygienic design. ä Accuracy ± 10 mm. Cone antenna ä Cone dimensions 2, 3, 4, 6 and 8. ä Withstands high pressures and temperatures. ä Can be used for free propagation or still-pipe measurement. (The 2 cone is only used for stillpipe measurement.) ä EEx IIC. ä Materials exposed to the tank atmosphere: PTFE or quartz sealing, antenna in steel or other metals, o-ring in Viton or Kalrez. Process seal ä Suitable in hygienic or aggressive tank atmospheres. ä Cone antenna protected by a cherame or PTFE sealing towards the tank atmosphere. ä Withstands high pressures and temperatures. ä 4" and 6" versions. ä 4" version for hazardous applications (EEx IIB). Parabolic antenna ä Exposed parts in tank: Stainless steel and PTFE. ä Highest antenna gain. ä Withstands heavy contamination. ä EEx IIC. 8

10 Modules in the different Saab TankRadar Pro versions Explosion FFT FHAST Echofixer MET approval Increased Disturbance Improved accuracy±5mm echo handling resolution Lite option option option Standard option option Gold Power supply Level output Extra output Power consumption Tank connection Antennas Antenna materials Pressure Tank temperature Ambient temperature General technical data VAC or VDC Display, analog 4 20 ma superimposed with digital HART, serial MODBUS, Profibus DP Analog 4 20 ma (for volume, signal quality etc.) Max 10 W Flexible Rod, Cone, Process Seal, Parabolic Teflon, SS 316L/HC22/Tantalum, Viton/Kalrez -1 Max 55 Bar (Vacuum max 790 Psi) ºC ( ºF) ºC ( ºF) Instrument accuracy ± 5 mm (± 0.2") Repeatability ± 1 mm (± 0.04") Standard measuring range 0 50 m (0 165 ft.) Further distances on request Sensitivity Ultra High Processors Dual processor design, DSP: TI 50MFLOPS 32-bit Ex approval EEx de [ib] IIC T6, Class I, Div. 1 & 2, Groups A, B, C and D Overfill protection TüV approval BPG-US 99/6001 Weight 8 kg, 18 lbs. Height above flange 370 mm (15") 9

11 MENU ITEM GRPH A L W A Y S O N T H E L E V E L Easy system configuration Installing and configuring your Saab TankRadar Pro is a quick and easy process, regardless of whether the gauge is used stand-alone or integrated into an existing process control system. There is no downtime, due to emptying tanks or halting on-going processes. Just install the sensor unit on top of the tank, connect a power source and, if required, connect the unit to your existing system. Level mm Stand-alone with integrated display panel For stand-alone applications, your Saab TankRadar Pro can be equipped with a userfriendly display panel which allows you to monitor tank level, level rate, volume, signal strength and other data. For single tanks this is a cost-effective solution, offering full access to all level data of interest. Stand-alone with integrated display panel. 10

12 System integration full flexibility For larger tank farms operating under automatic control systems, as DCSs or PLCs, your Saab TankRadar Pro has full flexibility with analog outputs, HART interface and MODBUS. This allows full integration of the Saab TankRadar Pro transmitters into most existing control systems. The built-in flexibility of Saab TankRadar Pro combined with the HART standard ensures that Saab TankRadar Pro can be integrated with a minimum of effort and cost. HART-communicator connected to primary analog output. Two analog outputs with superimposed HART communication to PLC and other devices. 11

13 TankRadar L/2 A L W A Y S O N T H E L E V E L Integrating with Saab TankRadar system By using the MODBUS field bus protocol, Saab TankRadar Pro can be used in combination with Saab Tank Radar Rex, the market leading high accuracy radar tank gauging system (± 1 mm) for custody transfer applications. Saab s Operator s Interface (Saab TankMaster) provides access to temperature, pressure and oil/water interface measurements, using Data Acquisition Units. Slave Data Acquisition Unit Field Bus Modem Field Communication Unit Rex TankRadar PRO TankRadar PRO TRL/2 Integrating with Saab TankRadar system. 12

14 Integrating with LAN Saab TankRadar Pro can easily be integrated into your own Local Area Network by using the HART technology. This allows easy access to transmitter data. Integrating with PC-based Local Area Network (LAN). 13

15 Outstanding technology for level measurement When designing a radar level gauge choosing the right technical platform is essential to achieve reliable level measurement. The tank level is determined by processing the frequency difference between the transmitted and reflected signals (FMCW). The time needed for the radar signal to travel down to the surface and back again is proportional to the distance between the transmitter and the surface. Thus, the product level can be calculated if the time is known. There are two main modulation techniques: The pulse technique, which is based on transmitting a radar pulse towards the liquid surface, and actually measuring the time for the pulse to return. Since it is difficult to make accurate measurements of such a small time interval, this technique is only suitable for low accuracy applications. The high performance radar level gauge Saab TankRadar Pro uses the other method the optimal Frequency Modulated Continuous Wave (FMCW) method. 14

16 Accurate and reliable measurement the FMCW method Using FMCW, Saab TankRadar Pro transmits a microwave signal with a continuously varying frequency towards the liquid surface. When the reflected signal returns to the Gauge, it is mixed with the outgoing signal. Since the transmitter continuously changes the frequency of the transmitted signal, there will be a difference in frequency between the transmitted and the reflected signals. The gauge mixes the two signals, resulting in a low frequency signal which is proportional to the distance to the liquid surface, and can be measured very accurately. This permits fast, reliable and accurate level measurements. The FMCW method: The distance (d) is calculated by measuring the frequency difference (Df) between the transmitted frequency (f1) and the reflected frequency (f0). 15

17 10 GHz the optimum frequency Choosing the right microwave frequency is essential in radar level gauging. Higher frequencies give shorter wavelengths which are more sensitive to vapour, foam and contamination. Up towards 24 GHz even a small amount of water vapour is enough to absorb the microwaves. Lower frequency give longer wavelength and wider beam angle, which results in a lot of interference The optimum radar frequency is approximately 10 GHz. echoes from the walls and agitators. The optimum frequency has been found to be around 10 GHz. Saab TankRadar Pro is the sixth generation of radar gauges from Saab Tank Control that uses this frequency. Self-calibrating six times per second While Saab TankRadar Pro constantly measures the liquid level it also sends a reference signal to a built-in calibration line with a known internal distance. Thus, it is actually self-calibrating six times per second day after day, year after year. This feature eliminates downtime for maintenance or recalibration procedures. Saab TankRadar Pro is self-calibrating six times per second, throughout its lifetime. 16

18 The fine art of signal processing The advanced functionality of the Saab TankRadar Pro is implemented by using stateof-the-art digital signal processing technology. Proven Saab technology is combined with new, unique and innovative solutions in order to provide robust and reliable solutions for almost any application. Programmable Memory Dynamic Memory Real Time Memory Echofixer Multiple Echo Tracking Disturbance Echo Handling Signal Digital Signal Processor FFT Product Level FHAST Filter High Accuracy Saab TankRadar Pro signal processing schedule. 17

19 Fast Fourier Transformation (FFT) Fast Fourier Transformation (FFT) is the simplest and one of the most widely used signal processing techniques. FFT works with relatively low resolution and accuracy. The powerful Digital Signal Processor (DSP) in Saab TankRadar Pro performs fast FFT calculations of the incoming tank signal, and provides a frequency spectrum that is analysed to find the liquid surface. Since the frequency is related to the distance between the transmitter and the reflecting object, the spectrum can be mapped to corresponding tank levels. FFT ensures fast level measurements with relatively low resolution and accuracy (±10 mm). 18

20 Saab s echofixer improves the disturbance echo handling Saab s echofixer is a software module that improves the reliability of the level gauge when used in tanks with agitators or other false echo sources. When there are echo-disturbing objects in the tank such as agitators, baffles, mixers, pipes, heating coils etc., the DSP must be able to distinguish between the actual liquid surface and the interfering echoes. Saab s echofixer adds sophisticated functionality to improve the ability of Saab TankRadar Pro to separate disturbing echoes from the surface echo. Saab s echofixer registers echoes according to certain criteria, thus making it possible to use sophisticated methods for adapting the measurement to various situations. Dynamic and real-time updated information from previous measurements is used to make intelligent decisions based on collected information by the gauge itself. Saab s echofixer can also use information provided by the operator as a complement to the automatically collected data. The high performance of the DSP makes it possible to handle complex measurement situations. Saab s echofixer improves the reliability of the level gauge when used in tanks with agitators or other false echo sources. 19

21 Fast High Accuracy Signal Technique (FHAST ) improves accuracy In order to further improve the measurement accuracy, Saab s Fast High Accuracy Signal Technique (FHAST ) can be applied to the resulting signal. The FHAST filter limits the region around the liquid surface to be analysed, resulting in a much more efficient signal processing. FHAST provides significantly faster and more precise signal processing by using the processor capacity on vital information. By using a FHAST filter a significant increase of the measurement accuracy, up to ±5 mm, can be obtained. The FHAST filter limits the region around the liquid surface to be analysed, resulting in a much more efficient signal processing. Multiple Echo Tracking (MET ) improves measurements in echo-disturbed In tanks with echo-disturbing objects, it may be necessary to further increase the resolution, by adding the Multiple Echo Tracking (MET ) module. MET increases the resolution of the radar image so that the sensor can identify genuine echoes more easily, and improve the accuracy in echodisturbed areas. MET provides even more advanced algorithms which efficiently handle interfering echoes. An agitator, for example, can cause interference when the sensor attempts to differentiate echoes from the liquid and agitator surfaces. MET measures on the disturbance as accurate as on the surface level, making it much easier to distinguish between the echoes. 20 In tanks with many disturbing objects, MET increases the resolution of the radar image so that the sensor can identify the liquid level from disturbances.

22 Sensitivity the quality to handle tough conditions Saab TankRadar Pro has an ultrahigh sensitivity resulting in outstanding reliability. For all radar gauges, a certain amount of microwave energy has to return to the gauge. Only if the reflected signal is sufficiently stronger than the noise, a reliable measurement can be made. This is why sensitivity (or signal/noise ratio) is one of the most important qualities that differentiate high quality gauges from less reliable types of gauges. A high signal/ noise ratio makes it possible to detect and measure weaker echoes which normally appear in process tanks where conditions change (for conditions that affect the signal strength, please refer to the list next page). To ensure accurate and extremely reliable gauging even in the toughest conditions, Saab TankRadar Pro features an ultra-high sensitivity. The signal is affected by: 1) Distance attenuation. 2) Antenna size. 3) Surface conditions. 4) Dielectric constant. 5) Foam. 6) Vapour, dust. 7) Dirt on the antenna. See next page. 21

23 The strength of the reflected signal is affected by: 1) Distance attenuation which makes the received radar signal weaker at longer measuring distances. 2) Antenna size which influences the performance substantially. A larger antenna gives a narrower beam and has a larger receiving area. A doubled area increases the signal/noise ratio approximately six times. 3) Surface conditions such as waves and turbulence can reduce the reflected energy. For process industry applications it is practical to regard a turbulent surface as the normal case. 4) The dielectric constant e R. Different types of liquids have different dielectric constants, and can be divided into two groups: oil-like and waterlike. The former group reflects only a few percent of the microwave energy, while the latter group reflects most of it. 5) Foam which in the worst case can eliminate the echo, while in other cases it may appear totally transparent to the radar. 6) Vapour and dust in the tank atmosphere, which have an influence on the performance similar to foam. This influence is eliminated when using a frequency of 10 GHz. 7) Dirt on the antenna which affects performance in the same way as foam. But with a highly sensitive system like Saab TankRadar Pro, and a correctly designed and dimensioned antenna, the influence of dirt on the antenna is reduced to a minimum. Measuring on a turbulent water surface with a waveheight of 15 mm, corresponds to measuring on a calm hydrocarbon surface. Of course, Saab TankRadar Pro is designed and developed with the knowledge of these factors, thus capable of delivering reliable measurement under any conditions. In short it is a gauge you can depend on, whatever the application, partly due to its high sensitivity. 22

24 Your Saab TankRadar Pro representative will be pleased to tell you more The information provided here is of necessity brief and meant as an introduction to reliable radar level gauging. We are convinced that Saab TankRadar Pro, together with its various options, is a superior solution to your level measurement requirements. The next step is to contact your Saab TankRadar Pro representative. He has access to all the detailed information you will eventually need and can give you a practical demonstration of the advantages of Saab TankRadar Pro. 23

25 Saab Tank Control Box SE Gothenburg SWEDEN ALWAYS ON THE LEVEL

26 Contact us, before your competitors do Saab TankRadar Pro is the best solution on the market from both long and short term perspectives. Now you probably want more information, or try out a Saab TankRadar Pro gauge. So please get in touch with us, either by phone or by mailing or faxing this coupon. Please send me more information: Saab TankRadar Pro Application examples Saab TankRadar Pro Technical description Saab TankRadar Rex the custody transfer gauge Please arrange to have someone contact me personally Name: Position: Company: Plant type: Division: Address: Postal address: Telephone: Telefax: