Sensornet ORYX DTS, User Manual

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Page 3: ... DATA COLLECTOR ODC 20 SELECTING ROOT ADDING AN ORYX 20 CONFIGURING THE ORYX 29 THE DATA LOG FILES 41 GUIDE TO DTS MEASUREMENTS AND THE ORYX CONFIGURATION WIZARD 46 BACKGROUND TO DTS 46 GRAPHICAL USER INTERFACE 49 ORYX CONFIGURATION WIZARD 52 DOUBLE ENDED MEASUREMENTS 68 INTRODUCTION TO DOUBLE ENDED 68 CONFIGURING A DOUBLE ENDED MEASUREMENT 69 THE ORYX DATA VIEWER 74 SOFTWARE INSTALLATION LICENSIN...

Page 4: ...TROUBLESHOOTING 87 SPECIFICATIONS 89 PERFORMANCE SPECIFICATIONS 89 OPERATING PHYSICAL SPECIFICATIONS 90 DIMENSIONS 93 WARRANTY 93 ...

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Page 7: ...mbol This symbol is used throughout the user guide whenever there is a risk of damaging the Oryx DTS system Ensure that these warnings are read and understood at all times NOTES Used throughout the user guide to provide additional information hints and tips WARNING THE ORYX DTS IS HEAVY ENSURE ADEQUATE CARE IS TAKEN WHEN LIFTING AND MOVING THE UNIT SHOULD BE MOUNTED ON A SUITABLE SURFACE OR RACK M...

Page 8: ...ates a pulsed laser device whose invisible output radiation is potentially hazardous if viewed directly by eye The laser radiation emission from the laser within the ORYX DTS is permanently coupled into a 50 125 multimode optical fibre whose end is terminated with an APC angled polished optical fibre connector The Oryx DTS should be interfaced to a test fibre using patch cord or pigtail assembly f...

Page 9: ...RNING DO NOT EXAMINE OR INSPECT EXPOSED FIBRE OR CONNECTOR ENDS USING A VIEWING AID SUCH AS AN EYE LOUPE OR MICROSCOPE WHILE POWER IS APPLIED TO THE DTS WARNING DO NOT UNDERTAKE FUSION SPLICING OR SIMILAR FIBRE JOINTING WHEN THE DTS IS IN OPERATION WARNING THE DTS SYSTEM CONTAINS NO USER SERVICEABLE PARTS AND THE PROTECTIVE HOUSING FULLY ENCLOSES A CLASS 3B EMBEDDED LASER DEVICE UNDER NO CIRCUMSTA...

Page 10: ... a base station computer or download to a local PC laptop 32MB of on board memory is available which is sufficient to store approximately 600 separate DTS measurements The raw data is processed and temperature calculations are performed on the base station or laptop and this is where the data is permanently stored The base station server runs Sensornet software which communicates with multiple Ory...

Page 11: ... has been established for direct communication with the Oryx This currently operates over a serial RS232 communications link Sensornet provides several options for this communications link such as radio or GPRS modems serial over Ethernet or alternatively existing communications infrastructure can be used if the link is transparent to the protocol used If a communications link is not available the...

Page 12: ...Page 6 Oryx DTS User Manual v4 Self protecting features idle mode activated if environmental temperature out of range or power supply voltage outside limits ...

Page 13: ... All electrical connections are by removable screw terminals and optical connectors are E2000 APC type Figure 3 Oryx Connector Panel LIST OF CONNECTIONS 1 Input power 2 Serial RS232 communications ports Com1 Com2 3 PT100 external probe connections 4 Fibre Optic connector panel 5 Earthing point 6 Laser emission warning symbol 1 2 3 4 5 6 ...

Page 14: ... PC modem com port I1 Current source These terminals are for a standard 4 wire connection to a platinum resistance thermometer V1 Sensing terminal V1 Sensing terminal I1 Current sink Each of the electrical connector terminal blocks can be removed for ease of wiring It is recommended that the Oryx unit be earthed especially in out door installations Optical connections are made by simply inserting ...

Page 15: ...knurled thumb screws and carefully removing the panel There is sufficient slack on the inside fibre pigtails to allow removal and cleaning CAUTION If one of the internal optical connectors is damaged the unit will need repair at Sensornet Only remove the Optical Connector Panel if a dirty connector has been inserted or the optical connector loss cannot be reduced by cleaning the external connector...

Page 16: ...een inserted Specialist connector inspection microscopes are useful for verifying that connectors are clean and free of foreign material Video inspection scopes can also be used to view the condition of connectors There are two methods for cleaning connectors and couplings which are approved by Sensornet Ltd The technique used is dependent on the type of contamination If the connector has been exp...

Page 17: ...rial RS232 connection This mode is used in the following situations Direct connection of PC or laptop to serial port Connection of Oryx to an Ethernet to serial device server Connection to a Radio or GPRS data modem These communications links typically provide always up connection and are transparent to the protocol used Figure 5 Communication options ...

Page 18: ...ing the ODC software with the matching baud rate and the Oryx telephone number If a radio or GPRS modem router is installed these should be configured as per the manufacturer instructions at the remote Oryx site and if applicable the base station NOTE For GPRS the user will be required to provide a SIM card with fixed IP address suitable for machine machine communications Your network provider sho...

Page 19: ... in operation OPTICS POWER When illuminated this indicates that power is applied to the optics laser unit During an idle period this LED is not illuminated and no power is applied to the optics and laser DATA ACQUISITION When illuminated this indicates that power is applied to the data acquisition board During an idle period this LED is not illuminated and no power is applied to the board ...

Page 20: ...temperature range or a low laser output power No measurements will take place while this condition is present Once the temperature is back within range the error will clear and the next scheduled measurement will take place FAULT When illuminated indicates a general system fault not specifically identified by the other panel indicators STATUS This LED will flash during normal operation of the Oryx...

Page 21: ...e ensure sufficient free air flow around the housing A sun screen shadow box is essential to prevent heating by direct solar gain POWER SUPPLY The Oryx DTS operates on nominal 12 to 24VDC with a power consumption of 18W maximum The power supply used should be able to provide an initial turn on surge current refer to electrical specifications on page 92 In standby mode where no measurements are bei...

Page 22: ...supplied the computer hardware this will have the ODC and ODV pre installed and configured The software is installed by simply inserting the CD into the computer The installer should automatically launch however if it does not simply browse to your CD drive and double click the setup exe in the root folder NOTE If the software is being upgraded the old software should be uninstalled before attempt...

Page 23: ...icensed on a per computer basis each instance on a different PC requires a new license One license is provided with each Oryx unit and further licenses can be purchased from Sensornet The Oryx DTS ships with a default_idle configuration such that all channels are deactivated the laser will not power on and no measurements will be taken Setting all channels to inactive is one way to put the Oryx in...

Page 24: ... UPLOAD will upload a new configuration to the Oryx and will DELETE ALL MEASURMENTS on board the Oryx at that time Any data already downloaded to the PC is unaffected If selecting to start measurements as soon as possible there may be a delay of up to one repetition time before commencement of the first measurement Once the Oryx has been set up with a measurement configuration click the Collect da...

Page 25: ...TS User Manual v4 Page 19 While the ODC is downloading data from the Oryx device s connected live temperature data can be viewed using the ODV software Please see the ODV section later in this manual Page 74 ...

Page 26: ...puter rebooted for some reason On a laptop or other PC the user can launch the ODC as required to configure or collect data from Oryx unit s NOTE If Sensornet have supplied the computer hardware this will have the ODC and ODV pre installed and configured for the Oryx unit supplied NOTE Any reference to base station server equally applies to a laptop or other PC with the installed software SELECTIN...

Page 27: ...older Once the browse window has the desired folder open i e the folder you wish to use as root is open and displayed in the look in field click the button Current Folder see Figure 9 Figure 9 Example of root directory click Current Folder to select Sensornet_Oryx_DTS as the root Once the software has initialised the Sensornet DTS Oryx Main Menu will appear as shown in Figure 10 At this point the ...

Page 28: ...0 ODC Main Menu with no Oryx devices added EDIT BASE UNIT CONFIGURATION Select Edit Base Unit Configuration to make the Base Unit aware of any Oryx devices and how to communicate to them This will display the dialog window shown in Figure 11 ...

Page 29: ...n the user is able to configure and download measurements from the Oryx To remove an Oryx click Remove an Oryx and select the Oryx to be removed This will not delete any data or configuration files that have been stored for that Oryx NOTE Only one Oryx can be connected or associated to any particular COM port at any one time On clicking Add an Oryx the following dialog will be presented Figure 12 ...

Page 30: ...sible baud rates will be scanned so this process can take several minutes If there is a modem connected to the COM port the user is prompted for a telephone number to dial connect to the remote Oryx device The base station telephone number is also prompted for so that the Oryx can dial in Once an Oryx has been added select the File Configuration tab Figure 13 Here you can select what output file t...

Page 31: ...ble and they are described below COMMUNICATE WITH EACH ORYX AT LEAST ONCE EVERY The Base Unit will attempt to make a connection to the Oryx when it has not had any connection with that device for the time period specified here This ensures that even if an Oryx does not report back to the base station the base station will attempt communication with that Oryx and obtain its system status This will ...

Page 32: ... broken up into smaller packets You can also set the size of the data packets This could be useful for certain installations where you have a less reliable communications link between the Oryx and the Base Unit If the transmission of a smaller packet fails then only that packet has to be retransmitted instead of the complete data file IGNORE DATA READY MESSAGES FROM ORYX This will cause the Base U...

Page 33: ... browse button to select a new folder to be used as ROOT There are two options available when moving the ROOT folder Create new Root Folder only Create new Root Folder and move historic data They are both described below Create new Root Folder only This option will move all the necessary configuration files from the current ROOT folder to the new folder but none of the acquired historic measuremen...

Page 34: ...ll the historic measurement data Click the Move to new Root Folder button to affect the change NOTE When you have changed the Root folder for the ODC and you have already set the Root folder for the ODV see The oryx data viewer on page 74 you will have to change the Root folder for the ODV as well To do this delete the C Program Files Sensornet Oryx OryxDataViewer ini file It will then prompt you ...

Page 35: ...server or laptop and on the right background colour yellow are those actions relating to setting up and controlling the remote Oryx unit itself The Edit Base Unit Configuration button is described in the previous section The Oryx unit ships from the factory with default settings which the user will most likely need to change The sections below describe how to set parameters on the Oryx e g date ti...

Page 36: ...he communications parameters to be modified If more than one Oryx has been set up on the base unit select the appropriate Oryx from the drop down menu at the top of Figure 17 Figure 17 Selecting an Oryx to configure The serial number and base station PC COM port used are displayed Click Next and the dialog in Figure 18 will be displayed ...

Page 37: ...on of the settings and options are listed below Modem dial initialization string Dialling and initialization strings for the attached modem The default values are universally accepted but please check the particular modem being used Oryx Base station telephone number If a modem is to be connected enter the appropriate telephone numbers here Hang up after Oryx will hang up the modem after this time...

Page 38: ... removing the Oryx and scanning for it again page 22 It is recommended that COM1 on the Oryx is reserved for direct communications and COM2 for modem communications Figure 19 setting Oryx date time The Set Oryx Date Time tab allows the user to synchronise the Oryx on board time with the PC being used or set the date time to a particular value e g to take account of day light savings or if the Oryx...

Page 39: ... of an Oryx Use this option once you are familiar with the parameters or simply need to change the measurement time or range Configurations that have been previously set for the particular Oryx connected or other Oryx device can also be recalled for use or edited Figure 20 Configuration Editor Main Menu In most cases select Use existing configuration as template for the source configuration and th...

Page 40: ...en changed without changing the installation name a unique cfg file will still be created and a list of all such files will be seen under the Select Configuration drop down button If the Use default values as template option is checked the channel specific settings will be populated by default values The Installation Settings tab allows the user to enter a name for the configuration as well as set...

Page 41: ...n of the terms and parameters that can be set under the Channel specific settings tab NOTE Some values specifically distance values will be coerced to the nearest allowable value to that entered by the user Hence these parameters will not be set exactly as entered Once one or more channels have been activated for measurement the installation settings tab shows a coloured representation of the meas...

Page 42: ...EASURMENTS on board the Oryx at that time Any data already downloaded to the PC is unaffected The user is prompted to select the start time of the measurement cycle see Figure 23 NOTE Ensure the Oryx date time has been synchronised to the base station Date time entered should be Oryx time NOTE If selecting to start measurements as soon as possible there may be a delay of up to one repetition time ...

Page 43: ... be selected after a 60s countdown that gives the user a chance to select one of the other options to re configure the remote DTS or base unit NOTE The automatic data collect feature is useful in a permanent unattended installation where data should be collected continuously The ODC can be configured to restart if an operating system error or a reboot occurs Once Collect Data has been selected fro...

Page 44: ... the window and un checking the verbose option will only display any error logs that have occurred The Status Panel Figure 25 allows the user to get a status overview of an Oryx at a particular point in time If more than one Oryx is connected to the base station they will each have their own information fields and Get Status Update buttons in the status panel ...

Page 45: ...is given in the table below Label Description Note Updated at Time stamp at last status update All errors and reported values are valid at this time only PC comms Red indicates a failure to communicate with Oryx Comms failure or total power loss to Oryx Figure 25 Oryx Status Panel ...

Page 46: ...ue of the external PT100 probes If a system error has occurred no measurements will take place and one of the following LED indicators will also be illuminated Laser error indicates a failure of the laser either no output power or temperature control failed Data acquisition error indicates an error with the data acquisition module Supply Voltage indicates that the power source to the Oryx is outsi...

Page 47: ...DC stores various data and configuration files within the Root folder specified at setup see page 22 An example of the expanded directory route is shown in Figure 26 Directories are indicated by blue rectangles and files by yellow rectangles Figure 26 Oryx DTS file structure ...

Page 48: ... hierarchy as shown in Figure 26 Full Data Set files are the complete data set generated by the Oryx DTS system after every repetition of the measurement cycle These contain the distributed temperature data raw signal data and various installation details name time date etc These data files have a ddf file extension NOTE The date and time of the file as reported by the Windows OS is simply the dat...

Page 49: ... the table on page 44 Figure 27 Example of the ddf data file type imported into spreadsheet Given the potentially large quantity of data that the DTS records the ddf files full data set can be up to 800kb in size while the dtd files temperature only can be up to 200kb ...

Page 50: ...ta set Latest This file contains the complete distributed temperature sensing data for an installation The contents of the data file include the raw Stokes and Anti Stokes data the optical fibre length information and the temperature at each point along the optical fibre Header information contains name date time software version numbers etc dtd Temperature only type Temperature only Latest Contai...

Page 51: ...nts of the existing Configuration File are revised Users are advised not to manually edit this file log txt Log file Text files recording system activity See text above ini Initialisation file Various files for the configuration of the ODC software Do not delete or modify dts DTS system file Oryx DTS system files Do not delete or modify The user can select which data file types are saved on the ba...

Page 52: ...ation modes within the glass core Changes in the temperature of the fibre cause the energy and the population of these vibration states to change Light is scattered from the vibrating molecules and as it does so experience a kind of Doppler shift The scattered particles of light known as photons are shifted slightly in optical frequency When the optical photons loose energy to the glass they are d...

Page 53: ...ndled while preventing mechanical damage to the central core and cladding The primary coating is commonly made from acrylate and has a diameter of 250 microns The 50 125 optical fibre used with Oryx DTS system is categorised as Graded Index Multimode Fibre The term graded index is used to explain the glass core which is constructed to have a parabolic refractive index gradient which increases smoo...

Page 54: ...ion when designing and calibrating an optical fibre sensing network The known signal losses of the optical fibre are used to optimise the DTS system See the ODV section on page 82 for more information on measuring losses in fibre cables NOTE The light signal propagates along the optical fibre from the DTS system to the end of the optical fibre and back again This means the system will experience a...

Page 55: ...it is necessary to set the parameters on the actual installed sensing fibre to ensure best accuracy The DTS is calibrated and set with default calibration constants at the factory however each installation should be checked on site Length scaling parameter dispersion This parameter sets the length scaling of the Stokes signal to match the Anti Stokes This is necessary due to the fact that each of ...

Page 56: ...adlock open To auto scale each axis one time only click the middle axis button while the padlock is open Figure 31 The scale Legend pallet Using the cursor control pallet Figure 32 the user can add and delete cursors and set whether the horizontal vertical cursors are locked to a displayed trace If the cursor is locked to a trace moving either horizontal or vertical cursor will cause the Wizard st...

Page 57: ...he cursor is positioned over graphical area The cross hair enables cursor actions the magnifying glass enables zooming and the hand allows panning movement of the trace within the graphical area Figure 33 The graph pallet Figure 34 Zoom functions The types of zoom functions are shown in Figure 34 and are available when the magnifying glass button is pressed The options are left to right top to bot...

Page 58: ...stallations ensuring the DTS can accurately measure temperature The DTS system is pre calibrated for use with common types of 50 125 graded index multimode optical fibre As such it is not essential to run the Configuration Wizard but is recommended for fine tuning the system for a specific installation To begin the Configuration Wizard select Measurement Config Wizard from the ODC main menu Figure...

Page 59: ...he indication button is not illuminated and no further setup of that channel will be processed the wizard will skip to the next channel Figure 36 Channel 1 Activated The user is then prompted to collect data for a period of time By default this is 30 seconds but can be increased if a long fibre is connected Press Collect Data to begin Once data is available the Stokes and anti stokes signals are d...

Page 60: ... from 50 to 0m is the internal reference oven of the DTS The zero meter point is at the DTS output connector With good continuous fibre the traces will show an exponential decay Point losses and temperature events along the fibre will cause the traces to deviate from a smooth exponential profile The end of the fibre will be visible if less than the maximum range The background no light level shoul...

Page 61: ...peeds two group indexes are present in the system The user should performing a length or dispersion correction to align the stokes and anti stokes traces to a single reference point along the optical fibre The most common and easily identifiable feature to use as a reference point is the optical fibre end In most installations the optical fibre length is known at least approximately and can be rec...

Page 62: ...m feature to clearly see the effect of alignment The adjustment is made by either clicking dragging the slide control or clicking within the value field defaults to 1 00000 and using the up and down arrows on the keyboard NOTE Ensure that the autoscale padlocks are not closed when adjustments are made otherwise the scales will zoom out automatically showing the full trace ...

Page 63: ... the region of interest to help set the maximum measurement range Differential loss correction Single ended The next stage is to set the method of differential loss correction This is required to correct for the slightly different loss in the fibre of the Stokes signal compared to the anti stokes signal which may vary from fibre to fibre For a continuous length of fibre at constant temperature thi...

Page 64: ...temperature along its length but can also be done if two sections of fibre are known to be at the same temperature This works best if the two sections are widely separated from each other The graphical display will update live as the slope value is adjusted using the slide control or the numerical value is modified See Figure 40 NOTE The absolute value or offset of the temperature trace does not n...

Page 65: ...both be at the same temperature or known to be physically co located such that the temperature profile over the sections is the same The software will then automatically calculate the slope calibration value See Figure 41 The two sections of fibre chosen will be highlighted by green and red bands The software will ensure that the calculated slope value sets the average temperature within these ban...

Page 66: ...ng what the temperature of each section is Select Temperature source to be fixed In this case the user enters the temperature of each section into the fixed temperature field Select Measured T1 T2 as the source The software will now assume that the external PT100 probe supplied is positioned within the section of fibre specified and calculate the slope calibration appropriately NOTE Again the actu...

Page 67: ...milar to the slope correction but now the absolute temperature reading of the DTS is calibrated As for the slope correction the user can choose between a fixed value correction or use a reference point or section of fibre In Figure 43 reference section has been selected as the calibration method and the offset reference has been selected as Point 800m entered with the temperature source as Fixed s...

Page 68: ... Dynamic in this case the calibration coefficient used will be calculated every measurement Hence the coefficient may change from trace to trace Fixed in this case the calibration coefficient calculated during the setup wizard will be fixed and used for all calculations of temperature data traces In most cases it is recommended to set the method to fixed so that the calibration coefficients will n...

Page 69: ...n the Add zones button to define the zones required Enter a zone label name and the start and end points as shown in Figure 45 The temperature trace can be zoomed to clearly view any particular region of interest and the zone is highlighted Click the Add zone button to define the zone and add it to the list Once all zones have been defined click OK The user will then see a list of the defined zone...

Page 70: ...Page 64 Oryx DTS User Manual v4 Figure 45 Setting a zone Figure 46 The list of defined zones ...

Page 71: ...aged on board to reduce the noise on the final temperature data trace and improve the temperature resolution Hence longer measurement times will reduce the noise and improve the signal to noise ratio NOTE The noise reduction follows an inverse square root law with measurement time i e to reduce the noise by a factor of 2 the measurement time needs to be increased by a factor of 4 For very short me...

Page 72: ...temperature traces continuously ensure the box is ticked Otherwise enter the total number of measurements to be taken before stopping NOTE The minimum repetition time allowed will be equal to the sum of measurement times for all active channels Uploading the Configuration On clicking next the user is prompted that all data on board the Oryx will be deleted when the configuration is uploaded data a...

Page 73: ...Oryx DTS User Manual v4 Page 67 This completes the configuration wizard setup and the user is returned to the main menu to begin collecting data from the Oryx ...

Page 74: ...ments where there is the possibility of hydrogen ingress This can cause the attenuation of the fibre to change and again the change may be different for the Stokes and anti Stokes signals Generally the change in attenuation only occurs in the exposed region and other parts of the fibre are unaffected The effects described above will result in the differential loss changing along the length of the ...

Page 75: ...t compared to the single ended method The physical range of the DTS is halved since both ends of the fibre must connect to the DTS The noise performance temperature resolution is degraded at each end of the fibre but best in the middle of the fibre This is a consequence of combining the measurements from each end of the fibre CONFIGURING A DOUBLE ENDED MEASUREMENT A double ended measurement should...

Page 76: ... DTS measurement Figure 49 Click Collected Return Data to measure the fibre loop from the opposite end Referring to Figure 50 the upper graphical plot will now show four traces the Stokes and anti Stokes from each end of the fibre Only part of the reverse traces may be displayed at this point The lower plot shows two temperature traces the white plot is that calculated from the first forward measu...

Page 77: ...ry last 50m of fibre is the internal reference section of the Oryx DTS the actual fibre cable end position is approximately 50m less than the point at which the raw data signals drop to zero This point is the connector at the output of the DTS and can typically been seen on the raw data traces as a small drop in signal due to the connector loss or a small spike due to a reflection An example of th...

Page 78: ...begin the alignment is to adjust the fibre end point value until the forward and reverse raw signals line up at the start and end of the traces Figure 52 In the case of a fibre loop formed from two fibres in one cable U installation the combined temperature trace will be symmetrical about the cable centre point as shown diagrammatically in 0 Due to the splice or bend at the end of such a cable it ...

Page 79: ...nal levels are approximately equal at this position Figure 52 Forward and reverse traces aligned This completes the double ended part of the configuration and on clicking Next the user is prompted to set the offset correction and follow through the rest of the setup as for the single ended case page 61 Once setup is complete the configuration has been uploaded to the Oryx exit to the main menu to ...

Page 80: ...ersion please uninstall the old version first The user is recommended to accept the default directories and options presented The ODV software is licensed on a per computer basis If a license has not been purchased a free 10 day trial is allowed Once this has expired a licence key will be required for further use During the trial period the user may click on the splash screen displayed at program ...

Page 81: ...ive Then take this removable drive to the new computer and install the ODV Enter the license configuration window on this computer and select License Transfer in Ensure the correct drive is specified in the dialog box and click Finish This completes the license transfer and the ODV should start normally if it does not select Program Resume Program execution SETTING ROOT SELECTING AN ORYX The first...

Page 82: ...e user to browse for a folder Once the browse window has the desired folder open i e the folder you wish to use as root is open and displayed in the look in field click the button Current Folder see Figure 56 Figure 56 Example of ROOT directory Click Current Folder to select Sensornet_Oryx_DTS as the root ...

Page 83: ...on number of the software is displayed near the top of the window under the Sensornet logo Figure 57 The ODV main view The data from different Oryx devices may be viewed from within the ODV All the Oryx devices connected to the base unit will be displayed in the Select Oryx drop menu from where one device can be selected Figure 58 Clicking the view system settings button enables the Oryx factory s...

Page 84: ...ollector NOTE The current data is only the most recent set of data downloaded from the Oryx DTS by the ODC This might not be the latest data actually on board the Oryx due to for example connection problems between the base unit and remote Oryx device The installation information Figure 59 shows the name of the current installation or configuration and the View configuration button allows the sett...

Page 85: ...t section Figure 60 Current data channel select The type of data displayed can be selected using the drop down menu below the channel selector the options are shown in Figure 61 Figure 61 Selecting the display type A description of the features associated with each of these displays is given below Immediately below the display type selector are two drop down menus that allow the user to select bet...

Page 86: ... is the main temperature display see Figure 57 showing temperature recorded along the fibre optic cable The user can pan zoom in out and move cursors on the temperature display by clicking the appropriate button on the graphical control pallet Figure 33 For more information please see the section on the graphical user Interface page 49 on NOTE Previous zoom and pan actions can be un done by holdin...

Page 87: ...on of time zones are defined within the ODC The user can select to display the average maximum minimum variance max minus min of the temperature within each zone The colour of each trace can be changed by clicking on the coloured bar for each zone and traces can be individually toggled on off by clicking the green bar at the bottom The display will update as new data arrives ...

Page 88: ...e along its length the signals show the classical exponential signal decay Also note the step loss at the zero meter point this is the connector loss at the DTS output Figure 64 The Raw data display Cursors can be added to the plot right click on the cursor display field select Create Cursor Free to measure the approximate loss Two cursors should be added they do not need to be snapped to a partic...

Page 89: ...re splice or connector loss since this parameter is much less temperature sensitive To measure the loss of a connector or splice simply zoom in on the feature and position the cursors immediately either side of the signal drop NOTE An increase or decrease in temperature at any position in the fibre will cause an increase or decrease in both the anti stokes and to a lesser degree the Stokes signals...

Page 90: ...shown in Figure 67 Highlight the files to be included and click Add or Remove as appropriate Figure 66 Choosing the data files to display in Historic mode NOTE Ticking the Add to previous data check box will allow different day or month data to be loaded at the same time Otherwise added data will simply replace the currently selected data Click OK to return and then OK again to use display the act...

Page 91: ...files The Load Installation Data button Figure 66 will load all data associated with the particular installation name selected i e over all months and all channels Please be aware that this could be a significant number of files and severely slow the computer ...

Page 92: ...leaning tape If the connector has been exposed to grease lint free tissues wetted with alcohol or pre soaked wet wipes should be used WARNING UNDER NO CIRCUMSTANCES SHOULD CONNECTIONS BE INSPECTED WHILE THE DTS SYSTEM IS LIVE AND OPERATING Please take great care when cleaning the connectors on the inside of the Oryx The fibre optic connector panel can be removed by unscrewing the four knurled thum...

Page 93: ...ctor loss 0 3dB Typical fusion splice loss 0 1dB one way Temperature trace exhibits step changes at fibre joints Clean connectors Re splice fibre joints Use double ended method Unstable calibration temperature trace jumps excessively after each measurement Incorrect slope or offset on temperature trace Check reference sections have been chosen appropriately Avoid reference sections across a temper...

Page 94: ...strength COM port not listed on computer Check virtual COM port software application lists the COM port is active Re boot computer Oryx date time incorrect Re boot computer and then synchronise the Oryx date time Should a fault need to be reported to Sensornet please include the following if possible 1 The Oryx serial number 2 A full description of the fault 3 An example ddf file of good data befo...

Page 95: ... 30 No upper limit Temperature accuracy C 0 5 Note 1 3 Max optical loss dB 7 4 5 Note 2 Maximum Range km 5 3 12 Max fibre length km 12 5 Note 2a Temperature resolution C Refer to www sensornet co uk for latest spec Temperature range C 200 to 600 Note 5 Sampling period M 1 Spatial Resolution M 2 Note 4 PT100 temperature range C 50 to 250 C PT100 accuracy C 0 25 200 to 200 C Note 6 RTC accuracy Min ...

Page 96: ...e fibre length exceeds this value 3 Preliminary 4 10 90 level of a temperature step of 20 C 5 Dependant on cable 6 1 5DIN probes 6mm diam x 50mm with standard temperature coefficient of 0 00385 C 1 4 wire connection 7 1min yr over 0 40 C Leap year adjustment t o 2100 No on board daylight savings adjustment 8 Typical expected lifetime 10yrs at 70 C 17yrs at 40 C 9 62 5µm fibre may be used with redu...

Page 97: ...cable length 3m On board storage 32MB Equivalent to 600 measurements at full range Ext Modem GSM GPRS Radio Satellite Optional Ext Serial Ethernet server External serial server required Virtual COM port software required on PC Optional Environmental Unit Min Max Comments Ambient operating Temperature SR C 40 65 Note 2 XR 5 65 Storage C 50 80 Note 3 ...

Page 98: ...lass 1M Laser products 2 95 RH max non condensing 3 When moved between places of differing temperature the Oryx DTS should be allowed to reach ambient temperature before measurements are attempted 4 SR 15 8W power draw at 22 C ambient 18W at temp erature extremes Excludes any communications module 4a XR 19 2W power draw at 22 C ambient 24W at tem perature extremes Excludes any communications modul...

Page 99: ... Manual v4 Page 93 DIMENSIONS WARRANTY The Oryx DTS is guaranteed against manufacturing defects for one year from date of purchase Should there be a fault with the system please contact Sensornet Ltd for assistance ...

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