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Siemens SITRANS F US SONO 3100 Handbook Download Page 35

SFIDK.PS.029.Q3.02

35

6.  Electrical connections

Elec. conn.

SITRANS F US SONOFLO

®

®

®

®

®

6.4 Frequency output

with a load 

> 

> 

> 

> 

> 

10k

Ω

Ω

Ω

Ω

Ω

If the load exceeds 

> 

10k

Ω

 it is recommended to connect a resistor to the frequency output as shown

on the figure above.

6.5 Relay mode signal

converter in compact
mode

Relay shown in de-energized position.

Relay 1

OFF

ON

Connection between

(De-energized)

(Energized)

Terminal No.

45-46

44-46

Error

"Error"

"Normal"

Direction

"Forward"

"Reverse"

Sound limit

Inside range

Outside range

6.6 Relay mode signal

converter 19" insert

Relay 1

Relay 2

Relays shown in de-energized position.

Relay 1

OFF

ON

Connection between

(De-energized)

(Energized)

Terminal No.

44-45

45-46

Error

"Error"

"Normal"

Direction

"Forward"

"Reverse"

Sound limit

Inside range

Outside range

Relay 2

OFF

ON

Connection between

(De-energized)

(Energized)

Terminal No.

41-42

42-43

Direction

"Forward"

"Reverse"

Sound limit

Inside range

Outside range

Summary of Contents for SITRANS F US SONO 3100

Page 1: ...O 3100 Signal converter type SONO 3000 085R9401 Order no FDK 521H0409 SFIDK PS 029 Q3 02 s Technical Documentation handbooks instructions manuals etc for the complete product range SITRANS F can be found on the internet intranet via the following link English http www4 ad siemens de WW view en 10806951 133300 ...

Page 2: ... used with any EEx approved sensor SONO 3100 and SONOKIT when the SONO 3000 EEx de ia ib IIC T6 is placed in safe area Supply voltage 115 230 V a c 24 V a c d c 24 V a c d c Sensor Size mm DN 50 DN 300 DN 100 DN 1200 DN 200 DN 4000 Connection examples DIN 2501 ANSI B 16 5 150 lbs RF None ANSI B 16 5 300 lbs RF Pressure bar PN 10 PN 16 PN 6 PN 10 PN 16 PN 40 PN 25 PN 40 Max PN 40 Class 150 Class 30...

Page 3: ... 5 11 Location of SENSORPROM flow memory unit 26 5 12 SONO 3000 Ex version 27 5 12 1 Introduction 27 5 12 2 Description of system 27 5 12 3 Installation of compact version 27 5 12 4 Electrical connection of compact version 27 5 12 5 Electrical connection for flame proof housing compact version 28 5 12 6 Electrical connection diagram compact version 28 5 12 7 Remote installation of signal converter...

Page 4: ...recision measuring system The ultrasonic flowmeter is a precision measuring system that is user friendly but must be installed in accordance with the instructions given in this handbook 1 2 Handling The sensor should be handled with care Impact and shock can damage the piezeoelectric crystals located in the transducers 1 3 System overview Sensor type SONO 3300 DN 50 DN 300 SONOKIT DN 200 DN 4000 S...

Page 5: ...m s to 10 m s Linearity Better than 0 4 for Reynolds number 5000 Better than 1 for Reynolds number 1000 Re 5000 Additional effects of deviations from reference conditions 1 Current output As frequency output 0 1 of actual flow 0 05 FSO 2 Effect of ambient temperature Display frequency pulse output 0 005 SPAN K 3 Current output 0 0075 SPAN K 4 Effect of supply voltage 0 005 of measuring value at 1 ...

Page 6: ...0 ms 50 ms 100 ms 500 ms 1 s 5 s Active Output mode 24 30 V d c max 25 mA 50 µs to 5 s 50 ms E Mech max 75 mA if F Hz 24 30 V d c max 50 mA 500 Hz to 10 kHz Passive Output mode 5 30 V d c Max current 200 mA Output mode Output can be either active or passive depending on electrical connection Relay Change over relay error indication 44 45 and 46 flow direction sound velocity limit Load 42 V 0 5 A T...

Page 7: ... directions to IEC 68 2 6 Ambient temperature Operation 20 C to 55 C Storage 40 C to 85 C Supply voltage and power 24 V d c 25 15 24 V a c 15 10 VA PE N and L consumption cable impedans 10 ohm at 24 V PE 1 and 2 Description of Ex approval EEx de ia ib II C T6 Flame proof Enclosure d Outputs intrinsically safe class ia Display keypad intrinsically safe class ib Power and sensor connections are incr...

Page 8: ...100 Description 2 track sensor with flanges and integrated transducers Nominal size DN 50 DN 65 DN 80 DN 100 DN 125 DN 150 DN 200 DN 250 DN 300 2 to 12 Liquid temperature Separate version 10 C to 160 C Compact version 10 C to 120 C Compact EEx d 10 C to 160 C Ambient temperature Separate version 40 C to 160 C Compact version 20 C to 55 C In stock 40 C to 70 C Enclosure Standard version IP 67 Ex ve...

Page 9: ...vailable in length L 160 corresponding material Allowing a pipewall thickness up to 20 mm Concrete pipe Transducer available in lengths L 230 Allowing a pipewall thickness up to 200 mm 2 5 SONOKIT mounting kit Coaxial cable 75Ω Ω Ω Ω Ω 1 x 0 8 mm copper conductor with shield Outside diameter 5 8 mm Length Max 250 m between sensor and signal converter Material outside jacket Black PE Ambient temper...

Page 10: ...10 SFIDK PS 029 Q3 02 Tech data 2 Technical data SITRANS F US SONOFLO 2 7 Sizing table DN 50 to DN 4000 ...

Page 11: ...ignal converter SONO 3000 IP 67 Signal converter wall mounted Weight SONO 3000 approx 2 0 kg Signal converter shown with wall bracket Weight Wall bracket with pipe clamp approx 1 6 kg 3 Dimensions and weight 3 2 Sensor SONO 3100 A Transducer holder B Transducer element C Terminal box ...

Page 12: ...ia mm mm mm PN 6 PN 10 PN 16 PN 25 PN 40 DN B mm L mm W 6 D 6 L 6 Flange dia mm mm mm W10 D 10 L 10 Flange dia mm mm mm W16 D 16 L 16 Flange dia mm mm mm W25 D 25 L 25 Flange dia mm mm mm 100 114 3 860 305 30 48 2 3 6 220 960 3 6 220 960 3 6 235 990 3 6 235 990 125 139 7 862 325 30 59 3 4 0 250 970 4 0 250 970 4 0 270 990 4 0 270 990 150 168 3 862 350 30 71 7 4 5 285 970 4 5 285 970 4 5 300 1010 4...

Page 13: ...es between the media and the ambient conditions the sensor must be isolated to prevent 2 phase flow which will result in measuring inaccuracy 4 2 Gas bubbles Avoid quantities of air collecting in the sensor as these will affect measurement When air is present installationofanairseparatorupstream of the meter is recommended 4 3 Direction of flow The double arrow marked on the sensor and indicates t...

Page 14: ...0 must only be mounted in a vertical position when the medium can be guaranteed free of air bubbles andparticles otherwiselossofsignalcanoccur 4 5 Installation in vertical pipes The sensor must only be mounted as shown in the figure Note the position of the terminal box 4 6 Installation in horizontal pipes Sensor type SONO 3100 without terminal box must not be mounted with the transducers in the v...

Page 15: ...Instrumentsultrasonicflowmeters can be seen on the sensor label Flanges according to PN Flanges and joints as well as related pressure temperature p t classification have been described in EN 1092 For steel group 1E1 Table 15 For stainless steel group 13E0 Table 18 Flanges according to ANSI Class Flanges and joints as well as related pressure temperature p t classification have been described in E...

Page 16: ...pes or cast into the walls of concrete pipes and are flushed with the internal wall The terminal housing is fastened on the transducer holder by a union Stress at the connection leads must be avoided when feeding them through the terminal housing The core without the spade terminal is connected to terminal no 2 The core with the spade terminal is connected to the transducer using screw pos 3 Mount...

Page 17: ... pressure 40 bar Space required for 50 mm transducers 1200 mm 160 mm trandsducer 1400 mm Flange type Terminal box transducer element and insert are identical in both versions The ultrasonic pulse is produced by sound energy being transmitted via the window to from the liquid The sound source is a piezoelectric crystal in the insert The insert consisting of a spring and piezo crystal can be removed...

Page 18: ...lied 3 Set the signal converter as described under Starting up The SENSORPROM unit is now program med with the required settings 4 Remove the battery and replace the SEN SORPROM unit in the terminal box The flowmeter is now ready for operation 5 Mount the signal converter Turning the keypad 24 V version 1 Insert a screwdriver under the lower edge of the keypad 2 Remove the keypad 3 Check to ensure...

Page 19: ...t sunlight Use a shield if neces sary Terminal box 1 Remove and keep terminal box lid 2 Turning the terminal box Lift and move the plate with terminal blocks to one side to give access to the screws Re move the two diametrically opposed screws and loosen the remaining two Turn the ter minalboxtotherequiredpositionandretighten the screws Warning If all four screws are removed at the same time there...

Page 20: ...pair and one for 4 coaxial cables Terminal box Terminal box Wall bracket Terminal box Wall bracket SONO 3300 3000 remote IP 67 2 Wall bracket for mounting of multi coax cable Always use the cable entry nearest the associated terminal so that unscreened lead ends from one cable do not cross those from the other cable 5 4 Wall bracket for use with multicoaxial cable 5 3 Remote installation of the si...

Page 21: ...converter installation Signal conv inst SITRANS F US SONOFLO 3 Connect track 1 to transducers C and D and track2totransducersAandB See Electrical connections for more details 5 5 Wall bracket for use with 4 single core coaxial cables ...

Page 22: ...n the mother board The SENSORPROM unit is located in the terminal box of the SONO 3300 sensor 2 Mount the mother board and the guide rails in the rack system as shown 3 Connect the cables as shown under Electrical connection 4 Plug the signal converter into the rack system 5 6 2 Signal converter in IP 65 version 1 Mount the IP 65 housing to the wall with four screws 2 Remove the signal converter f...

Page 23: ...ox of the sensor 4 Insert the signal converter into the frame and fasten with the four screws accessible from the front panel 5 Connect the cables as shown under Electrical connection 5 6 4 Back of panel mounting 1 Mount the connection plate in the back of the panel with four screws 2 Fit the SENSORPROM unit on the connection plate The SENSORPROM unit is located in the terminal box of the sensor 3...

Page 24: ...SONO 3000 approx 2 8 kg SONO 3000 19 rack module shown with IP 65 wall mounting enclosure Weight 19 rack module with IP 65 wall mounting enclosure approx 3 5 kg SONO 3000 IP 65 panel mounting kit for 19 rack module Weight Panel mounting kit approx 2 kg SONO 3000 19 rack module with back of panel mounting kit Weight SONO 3000 19 rack module with back of panel mounting kit approx 1 kg ...

Page 25: ...Q3 02 25 5 Signal converter installation Signal conv inst SITRANS F US SONOFLO 5 8 Connection board 19 insert 5 9 IP 65 wall mounting box connection The number of connection opportunities depends on the version type ...

Page 26: ...on board see fig The SENSORPROM unit is sensor specific and is being packed in the terminal box of the sensor or by sensor SONO 3100 fixed at the data plate To identify the SENSORPROM unit a label indicates the sensor type and serial number This number can also be found on the sensor data plate In addition the identity can be read on the SONO 3000 under the menu SENSOR CHARACTERIS TICS At start up...

Page 27: ...sor In a horizontal plane the signal converter can be turned through 0 360 by loosening the four allen screws mounted in the base It is also possible to rotate the display keypad in a vertical plane in steps of 90 by dismantling the four allen screws mounted on the outer edge of the front cover so that the display keypad can be positioned as required If the signal converter is turned more than 360...

Page 28: ...using compact version 5 12 6 Electrical connec tion diagram compact version Supply voltage 230 V a c 115 to 230 V a c is connected to terminals 1 and 2 The ground wire must be connected to the ground terminal on the terminal plate If the ground wire is not connected personnel can be exposed to 115 V 230 V this page has been updated 2003 11 ...

Page 29: ...nnec tion of separate version Electrical connections are made in the terminal housing located on the wall fitting No connections are made in the front of the signal converter The terminal housing is divided so that all terminals in the e increased safety category are located on the left hand side This comprises voltage supply and sensor connections All the output terminals located on the right han...

Page 30: ...9 Electrical connec tion diagram Supply voltage 230 V a c 115 to 230 V a c is connected to terminals 1 and 2 The ground wire must be connected to the ground terminal on the terminal plate If the ground wire is not connected personnel can be exposed to 115 V 230 V this page has been updated 2003 11 ...

Page 31: ... are to be replaced they are accessed by dismantling the cover located in the back of the enclosure The cover must only be opened when the mains supply is disconnected The cover is removed by placing e g a screwdriver with a diameter of approximately 6 mm in one of the two holes located in the edge of the cover The cover is removed by turning anti clockwise Thereafter the two screws holding the el...

Page 32: ...RPROM unit at the bottom of the housing 6 Replace the electronic unit and make sure that the two screws are tightened firmly 7 Replace the backplate and make sure that the plate is fixed with a torque of at least 5 Nm 5 12 14 Signal converter SONO 3000 Ex d Ex d in separate version Weight Ex d in separate version approx 11 kg 5 12 13 Location of the SENSORPROM flow memory unit remote mounting ...

Page 33: ... PS 029 Q3 02 33 6 Electrical connections Elec conn SITRANS F US SONOFLO 6 Electrical connections 6 1 SONO 3000 IP 67 compact mounted 6 2 SONO 3000 IP 67 remote mounted Connect coax cable to 81 83 85 and 87 ...

Page 34: ...uency pulse outputs Connect coax cable to 81 83 85 and 87 Supply voltage 230 V a c 115 to 230 V a c is connected to terminals 1 and 2 The ground wire must be connected to the ground terminal on the terminal plate If the ground wire is not connected personnel can be exposed to 115 V 230 V this page has been updated 2003 11 ...

Page 35: ...tion between De energized Energized Terminal No 45 46 44 46 Error Error Normal Direction Forward Reverse Sound limit Inside range Outside range 6 6 Relay mode signal converter 19 insert Relay 1 Relay 2 Relays shown in de energized position Relay 1 OFF ON Connection between De energized Energized Terminal No 44 45 45 46 Error Error Normal Direction Forward Reverse Sound limit Inside range Outside r...

Page 36: ... are stored automatically in the signal converter or the SENSORPROM flow memory unit The values remain stored in the event of power failure and when a signal converter is replaced Operation of any key illuminates the display The light is automatically turned off 10 minutes after last key operation The display is alphanumerical and indicates flow values and flowmeter settings The three fields F M a...

Page 37: ...e LOCK key and page through the main menu using by the PAGE FORWARD key until the required menu is reached Access the submenu by pressing the LOCK key CONVERTER SETUP MODE contains 3 submenus BASIC SETTINGS OUTPUT SETUP SENSOR CHARACTERISTICS In BASIC SETTINGS selection of flow direction measuring range measuring units totalizer units and low flow cut off can be made Further overriding of the outp...

Page 38: ...38 SFIDK PS 029 Q3 02 Starting up 7 Starting up SITRANS F US SONOFLO 7 3 Menu overview ...

Page 39: ...e is now reset to 1000 If the signal converter is left in CONVERTER SETUP for more than 10 minutes the converter automatically reverts to OPERATOR MENU VOL FLOW MAX VOLUME FLOW VOLUME FLOW UNIT m3 s UNIT m3 min UNIT m3 h UNIT l s UNIT l min UNIT l h UNIT ml s UNIT UGPS UNIT UGPM UNIT UGPH UNIT MUGPO UNIT Ml d MAX RANGE Choose engineering unit and the maximum volume flow range For SONO 3000 not fit...

Page 40: ...icate sound limit the relay will make if the actual sound velocity is outside the range given by SOUND VELOCITY 1 and SOUND VELOCITY 2 i e indicating that the mass flow is calculated with a density outside the defined range Select cryogenic mass flow engineering unit and the maximum mass flow range The SONO 3000 is able to measure compensated mass flow i e mass flow is calculated using volume flow...

Page 41: ...lid reading MIN forces the output to 0 in the event of an error and MAX forces the outputs to 100 Select flow direction and engineering units By selecting bidirectional flow the net flow i e the difference between the positive and the negative flows will be displayed Low flow cut off Forced control Current output CURRENT OUT CURRENT OUT OFF VOLUME FLOW MASS FLOW SOUND VELOCITY CURRENT OUT TIME CON...

Page 42: ...LOW SOUND VELOCITY PULSE UNIT m3 UNIT m3 10 UNIT m3 100 UNIT UG 0 1 UNIT UG UNIT UG 10 UNIT UG 100 UNIT MUG UNIT L UNIT L 10 UNIT L 100 FRQ PULSE BIDIRECTIONAL UNIDIRECTIONAL FRQ PULSE PULSE OUTPUT FRQ OUTPUT FRQ OUTPUT TIME CON xx xs PULSE WIDTH XXXX UUUU FRQ PULSE MAX xxxx Hz VOLUME PULSE XXXXXXXX UUUU PULSE UNIT PULSE UNIT UNIT kg UNIT kg 10 UNIT kg 100 UNIT ton UNIT lb UNIT lb 10 UNIT lb 100 ...

Page 43: ...when ERROR is selected Calibration options Wet calibration The calibration factor cannot be changed when the signal converter is connected to a SENSOR PROM unit With no SENSORPROM unit the cal factor is manual set Selecting Auto will allow the converter to calculate a theoretical calibration factor based on the information entered in the APPLICATION and PIPE GEOMETRY menus The theoretical cal fact...

Page 44: ...nd the scope of this handbook Please contact Siemens Flow Instruments for further information There is a connection between the number of tracks and which tracks may be set If installed as a one track meter the meter uses only the values set in track 1 Furthermore it has only electrical connections to transducers C and D If the meter is installed as a twin track meter one of the tracks can be swit...

Page 45: ...nt is equal to half the track distance H 2 Angle of ultrasonic track Displacement Zero adjustment The factory setting is applicable in most cases but if the user requires a high accuracy at low flow an APPLICATION dependent zero adjustment NEW AUTO ZERO is recommended The AUTO ZERO adjustment is initiated when the LOCK key is pressed The zero adjustment will take approx 60 seconds During the proce...

Page 46: ...w max 1300 Totalizer 1 Off Volume flow mass flow off Totalizer 1 direction Pos Pos neg bidirectional Totalizer 1 unit m3 Totalizer 2 Off Volume flow mass flow off Totalizer 2 direction Pos Pos neg bidirectional Totalizer 2 unit m3 Low flow cut off 1 5 0 9 9 Force control Off Off max min OUTPUT SETUP Current 1 Off Volume flow mass flow sound velocity off Current 1 direction Unidirectional Unidirect...

Page 47: ...mm2 s cSt Viscosity 1 Pipe diameter 0 398 Pipe geometry unit m m inch Pipe surface roughness 0 0004 0 0000 0 0100 No of tracks 2 1 2 4 Track 1 track On On off Track 1 track length 0 46 Track 1 track angle 60 Track 1 Displacement 0 179 Track 2 track On On off Track 2 track length 0 46 Track 2 track angle 60 Track 2 Displacement 0 179 Track 3 track Off On off Track 3 track length 0 46 Track 3 track ...

Page 48: ...3 h 100 l m3 60 2 60 480 ton h 100 kg ton 100 4 100 9 380 m3 h 100 l m3 100 4 20 800 ton h 100 kg ton 125 5 150 13 550 m3 h 100 l m3 150 6 50 1 200 ton h 1 t ton 150 6 220 18 850 m3 h 1 m3 m3 220 9 00 1 800 ton h 1 t ton 200 8 380 32 1 400 m3 h 1 m3 m3 380 16 3 000 ton h 1 t ton 250 10 600 48 2 200 m3 h 1 m3 m3 600 24 4 800 ton h 1 t ton 300 12 850 70 3 200 m3 h 1 m3 m3 850 34 7 000 ton h 1 t ton ...

Page 49: ...or a short while The signal converter will display the corresponding flow rate 3 For correct flow measurement the following parameters must be set CONVERTER SETUP MODE BASIC SETTINGS The dimension dependent settings are listed in table 2 previous page OUTPUT SETUP Set the required output signals SENSOR CHARACTERISTICS CALIBRATION CHOICE Choice WET AUTO If WET CAL FACTOR APPLICATION PARAMETERS Cabl...

Page 50: ...Current faults are stored in ERROR PENDING and current and past faults are stored in ERROR LOG The faults are stored in the form of an error code with indication of elapsed time since error registration Power off erases the content of the ERROR LOG In SONO 3000 errors can also be detected via the relay but conditional on the relay being set at ERROR under the menu OUTPUT SETUP When the converter i...

Page 51: ...nt in the sensor3 Unit registers flow in sensor 22 ON Sound velocity value outside the Check settings for track length and min max sound velocity measuring range 23 Hardware fault Replace SONO 30003 24 33 34 25 ON 1 Motherboard defective 1 Replace SONO 30003 2 Supply voltage too low 2 Check supply voltage 26 ON Fatal measuring error Remove the cause of additional error s and Forced output this cod...

Page 52: ...r is between 20 and 35 9 Service 9 1 Service menu The SERVICE MENU contains three sub menues INFORMATION FORCE OUTPUT and SIGNAL INFORMATION INFORMATION contains all identification data of the signal converter and sensor Note that the meter continues to measure and up dates the output s being in the service menu The only exception is when an output is set in the FORCE OUTPUT MENU Force output In F...

Page 53: ...quality of the oscillating transducer and liquid is indicated by the RESONANCE LEVEL A number higher than 100 indicates satisfactory operation Less than 100 indicates mismatch between transducer and liquid A value less than 20 will raise an alarm If the RESONANCE LEVEL is less than 100 and the meter still operates this is satisfactory If the RESONANCE LEVEL is below 20 and the meter is not measuri...

Page 54: ...ANS F US SONOFLO 10 Ordering this page has been updated 2006 03 15 Please look on our homepage http www siemens com flow under Product Selector Please use online Product selector to get latest updates Product selector link http www pia selector com ...

Page 55: ... V a c 7ME3150 2CC10 1AA0 2 frq pulse outputs 50 60 Hz 2 relay outputs 24 V a c d c 7ME3150 2CC20 1AA0 Signal converter 1 current output IP 65 115 230 V a c 7ME3150 2EA10 1AA0 SONO 3000 19 insert 1 frq pulse output ABS plastic 50 60 Hz assembled complete 1 relay output with wall mounting 3 current outputs IP 65 115 230 V a c 7ME3150 2EC10 1AA0 enclosure 2 frq pulse outputs ABS plastic 50 60 Hz 2 r...

Page 56: ...ge C mm No O ring 316 SS O ring PN 40 Plastic PA 6 6 20 100 50 FDK 085B5306 O ring 316 SS O ring PN 40 316 SS 20 200 50 FDK 085B5300 O ring 316 SS O ring PN 40 316 SS EEx d 20 200 50 FDK 085B5312 Flange 316 SS DIN 2512 PN 40 Plastic PA 6 6 20 100 88 FDK 085B5411 Flange 316 SS DIN 2512 PN 40 316 SS 20 200 88 FDK 085B5321 Flange 316 SS DIN 2512 PN 40 316 SS EEx d 20 200 88 FDK 085B5425 Flange 316 SS...

Page 57: ...l mounting kit for 19 inserts IP 20 FDK 083F3084 L 218 mm 28TE SONO 3000 wall mounting kit FDK 085F5027 SONO 3000 EEx d front glas incl frame FDK 085U2109 SONO 3000 EEx d gaskets for converter housing FDK 085U2002 SENSORPROM memory unit FDK 085B5329 for SITRANS F US SONOFLO When ordering Inform sensor code No and calibration factor For SONOKIT Inform sensor data and geometry 10 6 Accessories for S...

Page 58: ...B1375 100 FDK 085B1376 Teflon 75 Ohm coax cable 5 FDK 085B1378 Tmax 200o C 15 FDK 085B1379 Multi coax cable 10 FDK 085B1392 Tmax 70o C 20 FDK 085B1393 Multi coax cable 5 FDK 085B1390 Tmax 200o C 10 FDK 085B1391 Symbol 10 7 2 Cable and con nection boxes for SITRANS F US SONOFLO Type description Size Code No Junction box for IP 68 metal box for 2 coax cables FDK 085B1360 coax cable IP 68 metal box f...

Page 59: ...SFIDK PS 029 Q3 02 59 SITRANS F US SONOFLO 59 ...

Page 60: ...provement are always welcomed Technical data subject to change without prior notice The reproduction transmission or use of this document or its contents is not permitted without express written authority Offenders will be liable for damages All rights including rights created by patent grant or registration of a utility model or design are reserved Copyright Siemens AG 05 2002 All Rights Reserved...

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