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8.3

Automatic filtering

The

SeCorr 08

can perform an automatic

filter run (post-process

ing) after a measurement (see chapter 7.4.1). This procedure is

used to optimise the

filters of the coherence function with the

help of statistical methods. This permits to obtain optimum

cor-

relation results.
You may perform an automatic frequency analysis for both, run-

ning measurements or already stored measurements.

8.4

Checking the microphone connections

Make sure that the microphones are firmly and securely plugged

into their sockets. Remove any dirt or rust.

8.5

Using accessories

Use Sewerin accessories and auxiliary equipment. Use a hydro-

phone for

plastic pipes. The active filter makes additional fea

tures available. You can use the

„teach yourself“ tape to check

the system and to keep your level of knowledge up-to-date with

a minimum of effort.

8.6

Changing the location

Use a different location for positioning the microphones. Even

remote locations can generate better results if the sound trans-

mission is improved.

8.7

Saving time

If it turns out during a measurement that it is not possible to record

a peak, all run-up efforts to collect precise data on the pipe were

in vain. Practice has shown that it might be better to start the

measurement with estimated pipe data. If it turns out that the

assumed pipe length is greater and/or the sound velocity lower

than expected, a possible peak will appear in any case within the

correlation function – which simply cannot be „overlooked“.
Also with this more practice-oriented approach, it is still required

to determine the pipe data precisely.

8 Methods of optimising measuring results

Содержание SeCorr 08

Страница 1: ...Operating Instructions S e C o r r 0 8 ...

Страница 2: ...ermany Tel 49 5241 934 0 Fax 49 5241 934 444 www sewerin com info sewerin com Sewerin USA LLC 2835 Haddonfield Road Pennsauken NJ 08110 1108 Phone 1 215 852 8355 Fax 1 856 662 7070 www sewerin net sewerin usa sewerin net SEWERIN SARL 17 rue Ampère BP 211 67727 Hoerdt Cedex France Tél 33 3 88 68 15 15 Fax 33 3 88 68 11 77 www sewerin fr sewerin sewerin fr Sewerin Ltd Hertfordshire UK Phone 44 1462 ...

Страница 3: ...Illustration SeCorr 08 Rotary regulator Menu key ON OFF key Light key Central screen Enter key Arrow keys ...

Страница 4: ...RT 06 A Hz A Hz Filter key 4 LED 5 plastic low pass LED 6 metal Wideband Status LED 1 Power supply 3 Microphone connection 2 Illustration RT 06 ...

Страница 5: ...Operating Instructions 26 04 2010 V 4 X 103923 en SeCorr 08 ...

Страница 6: ... given below The product must only be operated after the relevant operating instruc z z tions have been read and understood The product must only be used for its intended purpose z z The product is only suitable for use in industrial and commercial ap z z plications Repairs must only be carried out by a specialist technician or by other z z suitably trained personnel Changes or modifications to th...

Страница 7: ...row keys 7 3 6 Up down arrow keys 7 3 7 Light key 8 3 8 Adjusting the contrast 8 4 Performing a correlation measurement 9 4 1 Entering pipe data 9 4 2 Starting a measurement 10 4 3 Evaluating the result 11 4 3 1 Filtering 12 4 3 2 Cursor 12 4 3 3 Zoom 13 4 4 Continuing a measurement 14 5 Measuring the sound velocity 15 5 1 General information 15 5 2 Performing a measurement 15 6 Charging equipment...

Страница 8: ...2 Filter basis 28 7 4 3 3 Filtering method 29 7 5 Measurement method 29 7 6 Parameter 29 7 6 1 Noise suppression 29 7 6 2 Measuring time 31 7 6 3 Summation average 31 7 6 4 Mode of curve 31 7 6 5 Correlation 31 7 6 6 Sampling frequency 32 7 6 7 Table 32 7 6 8 Standard values 32 7 7 Components 33 7 8 Setup 34 7 8 1 Date time 34 7 8 2 Language 34 7 8 3 Radio cable 34 7 8 4 System 34 7 8 5 Name 35 7 ...

Страница 9: ...ies 37 8 6 Changing the location 37 8 7 Saving time 37 9 Communication with PC 38 9 1 Requirements 38 9 2 Software installation 38 10 Technical data 40 11 Accessories 41 12 Error messages 42 13 Annexe 44 13 1 EC Declarations of Conformity 44 13 2 Advice on disposal 44 13 3 History of changes 45 14 Index 46 ...

Страница 10: ...le to improve e g the indi cation of leaks to enter several pipe sections or to measure the sound velocity The RT 06 radio transmitter can be used to measure fully auto matically the input level of the microphone and to set the level control of the amplifier to the optimum value Characteristics and parameters such as the used microphone type the charge state of batteries and the amplifier setting ...

Страница 11: ...at accessible fitting parts If the circular magnet is screwed on the piezo mi crophone it may be required to remove the circular firmly adhering protective disk from the magnet Plug both microphone con z z nectors into the sockets of the radio transmitter RT 06 If you want to use only one RT 06 it is required to connect a micro phone directly to input 2 of the SeCorr 08 On the RT 06 LED 1 must be ...

Страница 12: ...1 Channel 2 Is indicated together with message battery empty RT 06 1 RT 06 2 Indication Left Right Type with one signal channel Director connection of microphone to SeCorr 08 Radio transmitter 2 orange Type with two sig nal channels Radio transmitter 1 blue Radio transmitter 2 orange Only one radio transmitter is used e g in case of a defect Variant 1 z z blue radio trans mitter in use Radio trans...

Страница 13: ... microphone channels is indicated to the left and right hand side of the correlation function Note The SeCorr 08 version with two transmitters permits to connect a microphone directly two the SeCorr 08 e g if a radio transmitter is defective see also sec tion 7 8 3 started ...

Страница 14: ...s that the automatic amplification in the RT 06 is quickly and properly set The RT 06 is enabled when the sensor is plugged into socket 2 Press the filter key 4 generally if plastic pipes are used The right LED 5 is lit to indicate the changeover If this setting is selected only the low pass frequencies are transmitted to the correlator This may help to increase the quality of the correlation mea ...

Страница 15: ...ress the key only shortly If a correlation is stopped the diagram correlation function can be zoomed in If any key is pressed the display returns to normal representation 3 2 Rotary regulator Turn the Rotary regulator to move the selection or the cursor to the left right or up down You can use the Rotary regulator to change values in numerical entry fields e g pipe length Press the Rotary regulato...

Страница 16: ...ys Press these keys to move to the left or right within the selected function In some menus the arrow keys can also be used for selecting options You can access the next higher menu level by pressing the left arrow key You can use this func tion only if the cursor is set to its left or right end position 3 6 Up down arrow keys Press these keys to move the cursor up or down in a menu In some menus ...

Страница 17: ...tomatically switch es off after a pre set period see section 7 8 4 3 8 Adjusting the contrast The contrast of the display is au tomatically controlled in relation to the temperature You can adjust the contrast manually by holding the Light key pressed while operating the Up or Down Arrow key at the same time ...

Страница 18: ...your se lection with the Enter key Enter the pipe length Use z z the left or right arrow key to change between the displayed digits You can use the Up Down z z arrow keys to increase or reduce the displayed value in increments Confirm the length with the z z Enter key In the list select the material z z of the pipe section using the Arrow keys You can also use the direct option to enter the sound ...

Страница 19: ...nt transmitter is not switched on problems during connecting the microphone etc Select start with the Arrow z z keys and confirm your selec tion with the Enter key Use the headphones to check the measurement trend acous tically safety instructions see section 7 2 1 If necessary repeat these en z z tries for the second and third pipe section pipe data start continue Asummary of the entered z z pipe...

Страница 20: ... z can be interrupted any time by pressing the ON OFF key shortly An interrupted measurement can always be resumed After the z z measurement the re sult is displayed The adjacent illustration shows a correlation example The method of dis play depends on the setting selected in the Filter Setup menu 4 3 Evaluating the result The correlation function uses peaks to indicate where a leak may be locate...

Страница 21: ... limited Select Filter in the main screen z z The left filter limit flashes and can be set z z Enter key calculates the result function the other filter limit can z z be set can be repeated as often as you wish ON key returns to the main screen the result is displayed z z 4 3 2 Cursor After selecting the Cursor func tion with the Arrow keys you can move the cursor to any position using the Arrow k...

Страница 22: ...ot be taken from books only practice makes perfect The result of the measurement is based on the value marked in the CCF and on the entered pipe data In simple terms the correlation function represents qualitatively and chronologically the relation between the two noise signals that were recorded by both microphones It is generally not possible to distinguish between leakage noise that is the nois...

Страница 23: ...iously performed correlation Pipe data changed after the last correlation is not used It is recommended to continue the measurement if the result of the first measurement e g number of averaging processes 32 is not completely reliable Select continue with the Ar z z row keys and confirm with the Enter key Perform the measurement as described in section Starting a measurement pipe data start contin...

Страница 24: ...se location should not lie in the central range of the mea z z surement section in order to increase the measuring preci sion If the measurement section consists of varying pipe sections dif ferent materials or dimensions the sound velocity measurement will lead to incorrect results 5 2 Performing a measurement The measurement procedure is very similar to that of correlation measurements First con...

Страница 25: ...y regulator to the artificial leak If you select Input in the menu z z The determined sound velocity is loaded into the internal memory The measurement method Measure sound velocity is exited reset to standard method The central screen is called up You can now perform a correlation measurement for determin ing the real leak When entering pipe data which may require modifying it is recommended that...

Страница 26: ...e of the ra dio transmitter RT 06 is min 8 hours Optionally if the battery is emp ty the SeCorr 08 and the radio transmitter RT 06 can be operat ed with an external 12 V power source e g vehicle cable If the devices are to be charged or operated externally either the docking station HS 1 2 A with theAC DC adapter or the vehicle cable is required Charging the SeCorr 08 takes max 4 hours Charging th...

Страница 27: ... and 4 to the two RT 06 transmitters and cable 3 to the docking station HS 1 2 A 6 1 Battery state The battery state is indicated on the SeCorr 08 display by a bat tery icon together with the following messages RT 06 1 z z or RT 06 2 or SeCorr 08 Battery icon and message appear when the operation time of the corresponding component is less than 15 minutes More details are indicated by the status L...

Страница 28: ...then recharged This ensures that chemical deposits inside the battery are removed and that the memory capacity of the battery is improved The process takes approx 10 hours It is recommended to use this function regularly in cycles of 60 days for devices which are only rarely used Symbols and their meaning during the charging process Battery maintenance is enabled The temperature has exceeded 45 C ...

Страница 29: ... see Open Delete All see Open Filtering Automatic Manuel Setup Filter limit Filter basis Coherence Cross spectrum Spectrum KA 1 Spectrum KA 2 Filtering method Rectangle Hanning Measuring method Standard Sound velocity Parameter Noise suppression Automatic Manuel Off Measuring time Standard 32 Summation Average Summation Averaging Mode of curve CCF positive CCF pos neg TOP pos neg Type of correlati...

Страница 30: ... applies to Channel 2 If you select Channel 1 and 2 you will hear both channels at the same time stereo mode 7 2 1 AQUAPHON Use the Aquaphon function to enable the integrated feature for searching leaks This feature can be compared to that of the SewerinAQUAPHONA100 AF100 device These devices how ever are provided with a considerably wider range of functions You can use the microphones of this sys...

Страница 31: ...g defects Set the volume to an appropriate level z z Switch off the headphones when you suspect that z z interfering noise may occur pedestrians cars etc Switch off the headphones before moving the z z microphone Bear in mind that your perception capability is z z reduced 7 2 1 1 Display The display contains the following components Measuredvalue soundlevelatmicrophone Set sensitivity Headphones v...

Страница 32: ...basic amplification of the leakage noise You can select the following levels sensitive z z display range 10 medium z z display range 100 insensitive z z display range 1000 7 3 File In this menu you can open save and delete individual measure ments The professional version also permits to open save and delete sound samples The data is filed in the internal storage of the SeCorr 08 and can be called...

Страница 33: ...ossible to continue the measurement Up to 25 storage locations are available These locations are shared with the sound storage If you select Noise the currently measured noise is stored for approx 7 seconds Pay attention to the following Saving takes approx 35 seconds due to the high memory capacity The process cannot be inter rupted Use the arrow keys to select the item which you want to save z z...

Страница 34: ...orr 08 memory Select the file which you want to delete with the Arrow keys z z and confirm your selection with the Enter key The file is then deleted 7 4 Filtering You can use the filtering function to cut off certain frequencies from the correlation function thus leading to improved results You can select between manual or automatic filtering 7 4 1 Automatic filtering After a measurement SeCorr 0...

Страница 35: ...r right Cut off left Cut off right Use the arrow keys to shift the z z corresponding limit The appropriate frequency is displayed on screen Light grey frequency ranges are cut off Ranges which are indicated in black are used for correla tion If you want to zoom in the frequency range you need to change the set filter lim its beforehand see chapter 7 4 3 1 ...

Страница 36: ...h the result Press the z z Enter key to return to the direct filtering screen to redefine other filter limits if necessary Select Return to return to the z z central screen and to store the changed settings left filtering limit right cut off limit left cut off limit right filtering limit zoom filter right cut off left filter left ...

Страница 37: ...uses the following values Lower limit Hz Upper limit Hz 700 m s 5 500 Synthetic material plastic 700 m s 0 3000 Metal It plays no role whether the sound velocity is manually entered or whether appropriate pipe parameters are selected 7 4 3 2 Filter basis You can use this menu option to change how the frequency curve of the filter setting is represented Coherence z z This function is used to indica...

Страница 38: ...is enabled it is assumed that optimum results can be achieved in those moments in which the measured noise signal is relatively low This means that the per manently present leakage noise is preponderantly undisturbed In moments in which the signal is relatively loud the additional noise must come from a interference source in all probability leading to much less reliable measurement results The le...

Страница 39: ...e interruption is too long due to excess noise it is possible to manually increase the level range with Continue so that the sensitivity level is reduced The measurement is continued with the operator ignoring a certain level of interfering noise If the current level values fall below the level range an adjust ment is automatically performed i e the correlator is set to a more sensitive level c Of...

Страница 40: ...ow the correlation function is repre sented as follows CCF positive z z The CCF has only positive values CCF pos neg z z The CCF contains positive and negative values TOP positive z z The representation is similar to that of CCF positive Peaks however are represented more significantly in most cases TOP pos neg z z The representation is similar to that of CCF pos neg Peaks however are represented ...

Страница 41: ...ed in the signal Setting the sampling fre quency too low may lead to faulty measurements For this reason it is recommended to decrease the sampling frequency only in special cases e g if extreme low frequency noise is to be measured If Automatic is selected the sampling frequency is set to its maxi mum height If you want to define the setting manually select Direct You can then change the sampling...

Страница 42: ... overview of the most important information on the max 3 main components of the system 2 RT 06 devices 1 SeCorr 08 correlator Symbol explanation Battery empty Battery fully charged Low volume High volume Bad signal reception Good signal reception ...

Страница 43: ...e which channel is to be operated with radio transmission and which channel is to be directly connected to the SeCorr 08 Use the Arrow keys to select the channel which you want to z z change Confirm your selection with the Enter key Use the Arrow keys to toggle between RT 06 X and SeCorr 08 z z with RT 06 standing for radio transmission and SeCorr 08 for cable operation Confirm your selection with...

Страница 44: ...35 7 8 5 Name This option is used for entering name company and address 7 8 6 Service This menu option is reserved for the Sewerin service 7 Menu ...

Страница 45: ...e initial series of averaging proc esses you can improve it by increasing the number of cycles The result is improved because the calculation is based on a greater body of information on the chronological behaviour of the leakage noise However experience has shown that the result can only rarely be additionally improved if more than 64 to 128 averaging processes are selected 8 2 Using filters Use ...

Страница 46: ...e You can use the teach yourself tape to check the system and to keep your level of knowledge up to date with a minimum of effort 8 6 Changing the location Use a different location for positioning the microphones Even remote locations can generate better results if the sound trans mission is improved 8 7 Saving time If it turns out during a measurement that it is not possible to record a peak all ...

Страница 47: ...on the PC Connection of all cables and connectors Connect any serial interface of the PC to the SeCorr 08 socket with cap at the left hand side of the device Use the communi cation cable accessory for this The PC must not be configured to an interface higher than COM 4 Put the SeCorr 08 into the HSM docking station which is sup plied with 12 V It plays no role whether the SeCorr 08 is switched on ...

Страница 48: ...e They have the following format HA_DD MM YYYY_HH MM COR with DD MM YYYY Date day month year HH MM Time hour minute The files can be managed e g renamed moved just as any other file Opening measurements In the SeCorr 05 program you can open measurements with File Open file You can find more detailed information on how to use SeCorr 05 in the program s help menu ...

Страница 49: ...C 60 C Charging time 4 hours Weight 1 3 kg Protection class IP65 Dimensions W H D 125 180 65 mm Radio transmitter RT 06 Signal transmission 500 mW Charging time 5 hours Operating time 10 hours Filter setting wideband 0 3000 Hz Filter setting low pass 0 300 Hz Weight 1 3 kg Dimensions W H D 73 190 125 mm with antenna 510 mm Protection class IP67 ...

Страница 50: ...unting the water meter Hydrophone adapter UFH DN 80 for 1 female threads between ground hydrant and hydrophone type HA Adapter for main pipes M10 for the permanent coupling of a microphone to a slide valve or hydrant Adapter for in house connection M10 for the permanent coupling of a microphone to an in house cut off valve Piezo microphone EM30 non corrosive version Active filter for suppressing i...

Страница 51: ...08 and RT 06 the distance between z z SeCorr 08 and RT 06 is too large Remedy Check the corresponding radio transmit z z ters Are they really switched on Position the radio transmitter in such a z z way that the signal route between trans mitter and correlator is as good as pos sible line of sight between transmitter and receiver Check the radio transmission with the z z headphones Can you hear an...

Страница 52: ...ey appear only occasionally If they appear frequently contact the SEWERIN service F201 Communication error Error F201 can be ignored if they appear only occasionally If they appear frequently contact the SEWERIN service Note If further error codes are indicated please contact the SEWERIN service ...

Страница 53: ...declarations of conformity can be found online www sewerin com Downloads 13 2 Advice on disposal The European Waste Catalogue EWC governs the disposal of appliances and accessories Description of waste Allocated EWC waste code Device 16 02 13 Disposable battery rechargea ble battery 16 06 05 End of life equipment Used equipment can be returned to Hermann Sewerin GmbH We will arrange for the equipm...

Страница 54: ...Structural modification of the Filter z z menu December 2004 2 1 Upgrade of PC correlator program z z SeCorr 05 version 11 xx By that means data read out to PC has been improved the same sound velocity tables are used new error codes which refer to micro z z phones not attached January 2004 2 0 Modifications in the z z Aquaphon Mode Storage of sounds z z Storage of measurements with high z z resol...

Страница 55: ...6 Plastic pipes 5 37 Power supply 17 R Radio 34 Radio RT 06 1 42 Radio RT 06 2 42 Radio transmitter 1 2 3 5 12 15 17 40 42 A Accessories 37 38 41 Active filter 37 41 AQUAPHON 21 Aquaphon mode 22 23 45 Arrow key 7 8 13 Auto correlation 10 31 Average 11 31 32 B Battery state 18 C Cable 18 34 Channel 1 3 21 28 31 42 Channel 2 3 21 28 31 Channel assignment 3 Charging 5 17 Components 33 Correlation 6 1...

Страница 56: ...2 45 S Sampling frequency 32 Sampling theorem 32 Sensor 5 Service 35 43 Setup 11 28 Signal reception 33 Software 3 38 Sound velocity 1 9 15 16 28 29 32 37 Standard values 20 32 Store 23 Summation 31 Switching off 2 3 6 20 32 34 Switching on 1 2 5 6 System 34 37 T Table 15 32 Tape teach yourself 37 41 Time 34 39 U Units 34 Use 2 ...

Страница 57: ...Hermann Sewerin GmbH Robert Bosch Straße 3 33334 Gütersloh Germany Telefon 49 5241 934 0 Telefax 49 5241 934 444 www sewerin com info sewerin com 26 04 2010 b 103923 en ...

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