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Fully Digital Correlation

Digital sensor

• New sensor with improved sensitivity to low frequency noise (for plastic
and large diameter pipes and low pressure situations) - down to 1.0Hz

• Wider dynamic range than any previous sensor - can distinguish leak
noises much quieter than previous sensors

• True 16 bit

Σ∆

ADC with 10kHz sampling

• Immediate digitisation of received signal

• Low noise electronics with digital protocol eliminates interference

• Longer sensor cables possible

Digital radio Out Station

• Two-way communication with control unit using transceiver technology

• Virtually no data loss, interference or distortion of the transmitted signal

• Single radio frequency for all Out Stations

• Improved dynamic range over analogue radios

• High speed data transmission using transform
coding techniques

• No directional restrictions

New digital sensor with enhanced low frequency
sensitivity

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Содержание MicroCorr Digital

Страница 1: ...och House Llantarnam Park Way Cwmbran NP44 3AW United Kingdom Tel 44 0 1633 489479 Fax 44 0 1633 877857 Email info palmer co uk Internet www palmer co uk Mcorr Dig UG Issue 5b August 2003 Based on SW...

Страница 2: ...1 Key functions 11 Using the MicroCorr Digital Correlator 12 BATTERY WARNING 12 Step 1 Charging and installing batteries 12 Step 2 Set up and deployment of Out Stations 14 Step 3 Switching on the Corr...

Страница 3: ...function allows immediate post processing or off line correlation Software upgrades downloaded directly from www palmer co uk Results transferable into Windows PC for post processing or export Best in...

Страница 4: ...rom www palmer co uk Ground microphone foot option to improve versatility Permalog Patroller link option to improve versatility Designed for easy portability Fully automatic Immediate correlation swit...

Страница 5: ...s minute vibrations and through the water column as a pressure wave The leak noise travels at a constant velocity V which depends on the material and diameter of the pipe and arrives first at the sens...

Страница 6: ...charge lead for C U or O S 13 Operating manual Optional accessories 1 PC software for upgrades diagnostics PC interface 2 Spare battery pack with charge lead 3 Vehicle magmount antenna with cable 4 D...

Страница 7: ...igitisation of received signal Low noise electronics with digital protocol eliminates interference Longer sensor cables possible Digital radio Out Station Two way communication with control unit using...

Страница 8: ...with protective screen Tactile rubber keypad Rubber hand grip Carry strap attachment External antenna magmount connection Headphone charger connector Injection moulded housing Sensor connector Commun...

Страница 9: ...ete with cable to connect to the transmitter Its design incorporates sensor stowage and cable wrap Sensor stowage at rear Flashing hazard lights Cable with strain relief Digital sensor High strength m...

Страница 10: ...itch with integral flashing LED Sensor stowage Top view of transmitter connector covers removed Headphones charger connector Communications connector Sensor connector Antenna connector Top view of tra...

Страница 11: ...ey functions Keypad functions MicroCorr Digital has an alpha numeric keypad similar to that of a mobile phone including a full stop cancel enter and up down arrows Navigation through the menus uses co...

Страница 12: ...correlator and one for both Out Stations to be charged simultaneously All three batteries are identical and are interchangeable Charging for all batteries takes up to 4 hours from flat Charging the C...

Страница 13: ...connector on the top of the transmitter The Out Stations will turn themselves on to charge Remember to turn control unit and Out Stations off after disconnecting charger cables Although the batteries...

Страница 14: ...ore the Out Station turns off 3 Green LED functions The switch incorporates a green LED which provides the following functions When lit constantly the transmitter is charging When flashing rapidly the...

Страница 15: ...f the display only press the On Off button and select 1 to put into standby If the correlator is not then used for 2 hours it will switch off To reactivate the screen press the On Off button again The...

Страница 16: ...pe data If the Enter key is pressed the control unit will start to correlate as shown below Press ENTER to stop correlation to return to correlator function options There is an option to select either...

Страница 17: ...page for quick correlation instructions or Correlation Screen section for more in depth instructions File Enables the user to load previously saved files or save a current correlation The control uni...

Страница 18: ...ng functions such as pipe data filters and peak suppression can be changed on the loaded data without having to return to site to re correlate Using new information may correlate a different result Pr...

Страница 19: ...trol unit For an accurate result it is recommended to save three correlation s but obeying the following two rules One of the sensors must remain static during the collection of data Which of the sens...

Страница 20: ...given on the leak position and velocity but we recommend the user add a third result for a more confident result Then press 1 to add the third correlation result A third cross will appear and a best f...

Страница 21: ...current regression analysis graph results Press 5 Delete Enables the deletion of saved regression analysis files Press 6 Information Displays correlation information After pressing 6 use the arrow key...

Страница 22: ...and 4 0 seconds Each of these values provides the time delay range over which the correlator will correlate where the times in seconds shows twice the range For example over longer distances the 4 0...

Страница 23: ...decrease the screen brightness Press 2 to incrementally increase the screen brightness Press 3 to incrementally decrease the screen contrast Press 4 to incrementally increase the screen contrast Pres...

Страница 24: ...tored to the control unit Press 2 Units are Metric Toggle between METRIC and IMPERIAL measurement units Press 3 Time is in milliseconds Toggles between MILLISECONDS and SECONDS Press 4 Using HP printe...

Страница 25: ...are Off Toggles between ON and OFF This should normally be set to OFF and is normally only used during fault diagnosis Press 8 Information Connect sensors to Out Stations and turn on before pressing...

Страница 26: ...fault diagnosis Other System Options The MC Digital is designed for versatility Pressing 1 will activate the Permalog Patroller Link changing the MC Digital into a Permalog Patroller This is only pos...

Страница 27: ...Blue Out Station The time delay is calculated at 2 3 milliseconds The correlation shown has a SNR of 29 1 Signal to Noise Ratio SNR means the largest correlation peak is 29x larger than any other disp...

Страница 28: ...rately locate a leak position the user must enter the correct information with respect to the physical properties of the pipe Each section must be entered to be accepted by the system Press 5 to Add n...

Страница 29: ...to enter Length the distance between the sensors In this example 124m Press 2 to enter material type use the arrow keys to select the required pipe material and press ENTER In this example cast iron i...

Страница 30: ...rial situations press 5 to add another pipe If working on mixed materials work from the sensor colour displayed at the bottom of the pipe data screen back to the sensor colour at the top of the screen...

Страница 31: ...r has calculated press 4 and type in the new velocity value this will automatically update the default value for the current correlation only To enter and store extra user defined velocity s and diame...

Страница 32: ...centred around the dashed cursor line Moving the dashed cursor line along the graph to the required point then press 5 Use the arrow keys to zoom in or out stage by stage For a quicker zoom press 1 t...

Страница 33: ...art point of the data to be removed and press 1 to select a start point A small arrow will appear below the correlation graph Move the dashed cursor line along the data to select the stop point Press...

Страница 34: ...ss 7 View Settings During correlation or after stopping a correlation press 7 to view all pipe data and filter settings currently in use A pop up box appears to display the information Press Cancel to...

Страница 35: ...ires the leak to be positioned closer to one of the sensors to create a larger time delay The procedure for a velocity check is to position your sensors as described above Induce your leak or use the...

Страница 36: ...to either use the calculated velocity by pressing ENTER or CANCEL to ignore it By accepting the calculated velocity value the default velocity value under Pipe Data will be replaced with the new calcu...

Страница 37: ...ensors will only listen to frequencies of 406Hz and above Quick set non metallic removes all frequencies from 696Hz and above So the sensors will only listen to frequencies of 695Hz and below Clear al...

Страница 38: ...Hz and a low cut off was selected so all frequencies from 0Hz to 257Hz will be removed Press 2 High cut off When the right cursor line is selected the high cut off option is displayed Move the right c...

Страница 39: ...of the area to be removed and press 3 again In this example 105Hz The notch area of filtered out frequencys will change colour to cyan The current correlation will now ignore frequencys from 81Hz to 1...

Страница 40: ...he Palmer website www palmer co uk microcorr htm Once all the files have been downloaded to the PC start the MCD Updater Application and follow the instructions as described below Screen description T...

Страница 41: ...his menu option closes the MCD Updater application The Unit Type Menu This menu allows the user to select the type of unit that is being programmed The user can either select Base Station or Out Stati...

Страница 42: ...f completely and then switch back on again Upgrading an Out Station The following steps should be followed to upgrade the firmware within an out station 1 Connect the PC to the out station via the sup...

Страница 43: ...light 14 hours continuous use with backlight Key functions Combined correlation survey mode Listen acoustic survey Frequency analysis Peak suppression Compute Data replay for post processing Velocity...

Страница 44: ...n Flashing lights 2 Antenna External antenna Portability Integral sensor stowage Integral cable wrap Dimensions 210 x 145 x 305mm Weight 1 6kg Environmental IP68 Housing Fully injection mouled ABS Con...

Страница 45: ...blems occur notify Palmer Environmental Ltd or its authorised representative giving full details of the problem and the model and serial number of the equipment You will receive technical advice and o...

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