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SBE 25 .SEALOGGER CTD

1. External voltage channels 7 w 2 1 2 4 or 8 scans second Used to calculate elapsed irmware version pes Version gt 20 time if you select time as a parameter for a display Flan tins dais dE CS window For elapsed time calculation to be correct this EL LM scan sec entry must agree with number programmed into SBE 25 with CC see reply from status DS Surface PAR voltage added d Shaded sensors cannot be removed or changed to another NMEA position data added type of sensor All others are optional Channel Sensor New New to create new 1 Frequency Temperature con file for this CTD pen 2 Frequency Conductivity Open to select different con file Save or Save As to Save save current con file settings w tu Pressure Strain Gauge Oxygen SBE 43 Fluorometer Chelsea Aqua 3 Unavailable SPAR Surface Irradiance 3 Pressure voltage 4 A D voltage 0 5 A D voltage 1 B SPAR voltage 7 SPAR voltage Click a sensor and click Modify to change Modify Click a non shaded sensor and click Select to pick a different sensor for that channel calibration coefficients for that sensor A dialog box with a list of sensors appears Select sensors after number of voltage channels have been specified above Report Help Cancel 4 Click Save or Save As to save any changes to the con file Click Exit when done reviewing modifying the con file 44 Sect
2. To start logging again if the SBE 25 is still in Standby Mode wait at least 3 seconds after you put the switch in the Off position then put the magnetic switch in the On position Note that while in Standby Mode the SBE 25 continues to draw power from the batteries To exit Standby Mode type Ctrl Z or click Stop on SEATERM s Toolbar this removes power from the pump and the sensors connected to the differential input connector but does not remove power from the other sensors Failure to exit Standby Mode will run down the main battery supply Once the SBE 25 is out of Standby Mode it will automatically enter quiescent sleep state removing power from the remaining sensors after 2 minutes without receiving a command 25 Section 4 Deploying and Operating SBE 25 Pump Operation After the conductivity cell enters the water there is a user programmable delay before pump turn on so that all the air in the pump tubing can escape If the pump motor turns on when there is air in the impeller housing priming is uncertain and a proper flow rate cannot be ensured When the SBE 25 is deployed in a vertical orientation the tubing extending above the air bleed hole will contain a small reserve of water This maintains the pump prime for up to 1 minute depending on the length of tubing above the air bleed even if the SBE 25 is lifted up so that the cell inlet and pump outlet are just below the water surface This allows beginning the actual
3. When ready to redeploy send RL The SBE 25 will record new data in memory after the last recorded data e Standby Mode Recover the CTD and slide the magnetic switch to the Off position Wait at least 3 seconds and then slide the magnetic switch to the On position The SBE 25 will record new data in memory after the last recorded data 46 Section 4 Deploying and Operating SBE 25 Recovery WARNING Pressure housings may flood under pressure due to dirty or damaged o rings or other failed seals causing highly compressed air to be trapped inside If this happens a potentially life threatening explosion can occur when the instrument is brought to the surface If the SBE 25 is unresponsive to commands or shows other signs of flooding or damage carefully secure the instrument in a location away from people until it has been determined that abnormal internal pressure does not exist Contact Sea Bird for assistance with procedures for safely relieving internal pressure Note Connect the I O cable as described in Section 3 Power and Communications Test Defines data upload type when using Upload button on Toolbar or Upload Data in Data menu e All as single file All data uploaded into one file e All separated by cast All data uploaded Separate file is written for each cast with 3 digit cast identification number appended to user selected file name By scan number range SEATE
4. as well as the instrument s response e on the Toolbar click Status or Additionally a command can be manually typed in this area from the e from the Utilities menu select available commands for the instrument Note that the instrument must oo NE status 2 sie for it to respond to a command click Connect on the command which displays in the go banto wake up the instrument Command Data Echo Area and e Status bar Provides status information To display or hide the Status updates the Status bar bar select View Status bar in the View menu A 19 Section 3 Power and Communications Test Following are the Toolbar buttons applicable to the SBE 25 Toolbar Description Equivalent Button P Command Re establish communications with SBE 25 Computer responds with S gt Connect prompt SBE 25 goes to sleep after press Enter key 2 minutes without communication from computer have elapsed Display instrument status and setup Status samples in memory sampling setup DS etc View data headers cast number date and time first and last sample in cast number of external voltages sampled number of Headers DH measurements to average and reason logging halted A new header is generated for each cast Reset data pointers and cast numbers This ines should be performed after existing data IL has been uploaded from SBE 25 and prior to recording new data Capture instrument responses on scre
5. physical handling 47 uploading data 47 Replacement parts 69 S Saltwater deployment 26 SBE Data Processing 10 18 50 SEASAVE 10 18 44 50 SEASOFT 10 18 SEATERM 10 18 19 47 main screen 19 toolbar buttons 20 SeatermAF 10 18 Sensors 11 Software 10 18 Software installation 18 Specifications 11 Standby mode 25 36 Stop bits 14 Storage 57 System description 7 Index 74 T Terminal program 19 Test power and communications 18 setup 18 Timeout description 28 Triton 62 U Unpacking SBE 25 6 Uploading data 47
6. 45 seconds battery type ALKALINE 7 external voltages sampled stored voltage 0 external voltage 0 stored voltage 1 external voltage 1 stored voltage 2 external voltage 2 stored voltage 3 external voltage 3 stored voltage 4 external voltage 4 stored voltage 5 external voltage 5 stored voltage 6 external voltage 6 49 Section 4 Deploying and Operating SBE 25 8 Click Upload on the Toolbar to upload stored data in a form that Sea Bird s data processing software can use SEATERM responds as follows before uploading the data A SEATERM sends the status DS command displays the response and writes the command and response to the upload file This command provides information regarding the number of samples in memory setup parameters etc B SEATERM sends the header DH command displays the response and writes the command and response to the upload file This command provides information regarding the number of casts in memory samples per cast date and time casts started etc C If you selected By scan number range From a single cast or By cast number range in the Configuration Options dialog box Configure menu a dialog box requests the range or cast number as applicable Enter the desired value s and click OK D If you selected Prompt for header information in the Configuration Options dialog box Configure menu a dialog box with the header form appears Enter the desired hea
7. Convert SBE 25 reading from gage to absolute by adding 14 7 psia to the SBE 25 output 2 5 dbars 14 7 psi 0 689476 dbar psia 2 5 10 13 7 635 dbars Offset 10 1050 7 635 2 47 dbars Enter offset in con file For demanding applications or where the sensor s air ambient pressure response has changed significantly calibration using a dead weight generator is recommended The SBE 29 end cap s 7 16 20 straight thread permits mechanical connection to the pressure source Use a fitting that has an o ring face seal such as Swagelok 200 1 OR 59 Section 6 Troubleshootin Section 6 Troubleshooting This section reviews common problems in operating the SBE 25 and provides the most likely causes and solutions Each SBE 25 is shipped with a configuration con file that matches the configuration of the instrument number and type of auxiliary sensors etc and includes the instrument calibration coefficients Problem 1 Unable to Communicate with SBE 25 Note Using the reset switch erases the SBE 25 memory all logged data in memory is erased and all user programmable parameters date and time sampling scheme etc are reset to default values The S prompt indicates that communications between the SBE 25 and computer have been established Before proceeding with troubleshooting attempt to establish communications again by clicking Connect on SEATERM s Toolbar or hitting the Enter key
8. D cells Duracell MN1300 LR20 provide 24 hours continuous CTD operation Internal Batteries Optional Ni Cad battery pack provides approximately 8 hours operation per charge External Power Supply 14 16 VDC Sampling no auxiliary sensors or pump 190 mA Requirements PUMP 180 mA 3 Quiescent 150 uA Auxiliary Voltage Sensors Auxiliary power out up to 250 mA at 11 5 VDC A D resolution 12 bits Input range 0 5 VDC Main Housing Material Weight including all standard sensors and cage 600 meter 1950 ft acetal copolymer plastic 16 8 kg 37 Ibs in air 3400 meter 11 100 ft 6061 aluminum 19 4 kg 43 lbs in air 10 2 kg 23 Ibs in water 6800 meter 22 300 ft 7075 aluminum 19 4 kg 43 Ibs in air 10 2 kg 23 lbs in water 11 Section 2 Description of SBE 25 Dimensions Cage depth not shown is 30 5 cm 12 in PT dni Ring Battery Recorder Housing also called Main Housing a Optional PAR Sensor Guard Cage 316 Stainless Optional DO pH ORP Sensor al 95 cm i Optional 38 in __ _ _tL_4 Fluorometer Optional Pump Pressure Sensor SBE 4 Conductivity Sensor SBE 3 Temperature Sensor 12 Section 2 Description of SBE 25 Main Housing End Cap Connectors Note A y cable from J1 connects to the pump and to a data I O cable Cy Standard connectors 2 pin XSG 2 BCL HP SS 3 pin XSG 3 BCL HP SS and 6 pi
9. Like for other CTDs the common configurations of the SBE 25 are intended for obtaining downcast data because the sensors are oriented so that the T C Duct inlet passes through relatively undisturbed water as the CTD is lowered As the CTD is raised upcast the sensors sample the turbulent wake of the package resulting in lower quality data If planning to sample on the upcast consider the following e Vertical orientation In the typical sensors down configuration the sensors are in the wake of the housing on the upcast providing poor data quality If you must have good quality upcast data invert the SBE 25 so that the T C Duct is at the top ignore the downcast data for this configuration e Horizontal orientation for example under SBE 32 Carousel Water Sampler Upcast data is improved somewhat because the sensors are mounted as close as possible to the outside edge of the package Position other instruments sample bottles etc so that they are not directly above the T amp C sensors and do not thermally contaminate the water that flows to the sensors at the T C Duct inlet When an SBE 25 is installed on a water sampler good conductivity and optional dissolved oxygen data can be collected even when stopped to collect a water sample because water continues to flow through the sensors at a fixed and optimal rate Whether sampling on the upcast and or downcast position the T C Duct inlet so that other instruments sample bottl
10. O rings and mating surfaces for dirt nicks and cuts Clean or replace as necessary Apply a light coat of O ring lubricant Parker Super O Lube to O rings and mating surfaces Carefully fit the end cap into the housing and rethread the end cap into place Use a wrench on the white plastic bar to ensure the end cap is tightly secured Verify that the magnetic switch is Off so the SBE 25 will be in quiescent sleep state 56 Conductivity Cell Maintenance CAUTIONS e Do not put a brush or any object inside the conductivity cell to dry it or clean it Touching and bending the electrodes can Section 5 Routine Maintenance and Calibration The SBE 4 conductivity cell is shipped dry to prevent freezing in shipping Refer to Application Note 2D Instructions for Care and Cleaning of Conductivity Cells for conductivity cell cleaning and storage procedures and materials change the calibration Large bends and movement of the electrodes can damage the cell e Do not store the SBE 4 with water in the conductivity cell Freezing temperatures for example in Arctic environments or during air shipment can break the cell if it is full of water Sea Bird supplies a conductivity cell filling and storage kit to use in rinsing and cleaning the cell Disconnect the plumbing from the conductivity cell to use the filling and storage kit Conductivity sensor m7 Do not remove TC Duct for Conductivity rinsing
11. When you begin to feel resistance use the smaller Allen wrench to continue turning the screws Turn each screw 1 2 turn at a time As you turn the jackscrews the end cap will push away from the housing When the end cap is loosened pull it and the PCB assembly out of the housing C Remove any water from the O ring mating surfaces inside the housing with a lint free cloth or tissue Be careful to protect the O rings from damage or contamination D Disconnect the Molex connector connecting the PCB assembly to the battery compartment bulkhead E Remove the jackscrews from the end cap Remove plastic hex head screw typical 3 places 66 Appendix Il Electronics Disassembly Reassembly Reassembly Note Before delivery a desiccant package is inserted in the electronics chamber and the chamber is filled with dry Argon gas These measures help prevent condensation If the electronics are exposed to the atmosphere dry gas backfill with Argon and replace the desiccant package See Application Note 71 Desiccant Use and Regeneration drying for desiccant information Battery replacement does not affect desiccation of the electronics as no significant gas exchange is possible unless the electronics PCBs are actually removed from the housing Remove any water from the O ring and mating surfaces with a lint free cloth or tissue Inspect the O ring and mating surfaces for dirt nicks and cuts Clean or replace as necessa
12. alter SBE 25 memory and prompt the user twice before executing is not part of the command To execute the command type y and press the Enter key in response to message Y N Then hold down the Ctrl key and type y and press the Enter key in response to are you sure Y N Any other responses abort the command e The SBE 25 does not respond to any commands while logging e Ifthe SBE 25 is uploading data and you want to stop it press the Esc key or click Stop on SEATERM s Toolbar Press the Enter key to get the S gt prompt Entries made with the commands are permanently stored in the SBE 25 and remain in effect until you change them e The only exception occurs if the electronics are removed from the housing and disconnected from the battery Molex connector see Appendix II Electronics Disassembly Reassembly or the SBE 25 s reset switch is used see Section 6 Troubleshooting Upon reassembly or resetting initialize RAM IR reset the date and time ST and re enter all setup parameters 28 Section 4 Deploying and Operating SBE 25 Note If the battery voltage is below the battery cut off voltage the following displays in response to DS WARNING LOW BATTERY VOLTAGE Replace the batteries before continuing Status Command DS Display operating status and setup parameters Equivalent to Status button on Toolbar List below includes where applicable command used to modify parameter
13. communication between SBE 25 and computer Baud rate must match baud rate set in SBE 25 with SRx Deck Unit Modem COMM Port not applicable selection does not affect operation Make the desired selections and click OK 45 Section 4 Deploying and Operating SBE 25 6 Inthe Acquire and Display Real Time Data Set Up dialog box click Start Acquire A If SEASAVE was set up to prompt for header information Configure menu Header Form the Header Information dialog box appears Fill in the desired information to be added to the real time data file header and click OK B SEASAVE prompts Turn on the SBE 25 using the magnetic switch If you have already put the switch on ignore the prompt otherwise slide the switch to the On position Real time data then starts appearing in the screen display s 7 When done acquiring data in the RealTime Data menu select Stop Acquisition Then put the SBE 25 switch in the Off position Multiple Deployments If there is enough memory available it is not necessary to upload data before beginning subsequent casts Proceed as follows e Normal Mode Recover the CTD and slide the magnetic switch to the Off position Wait at least 3 seconds and then slide the magnetic switch to the On position The SBE 25 will record new data in memory after the last recorded data Or Recover the CTD and send a Ctrl Z or click Stop on SEATERM s Toolbar leave the magnetic switch in the On position
14. dumb 3 Follow the dialog box directions to install the software terminal or terminal emulator such as Windows HyperTerminal The default location for the software is c Program Files Sea Bird Within that folder is a sub directory for each program The installation program allows you to install the desired components Install all the components or just install SEATERM for now Test Setup 1 Remove the dummy plug from the Y cable and install the I O cable A Pulling the plug firmly away from the connector remove the dummy plug from the SBE 25 s Y cable connector strapped to the Main housing near the top of the cage Note that the Y cable is connected to the J1 connector and provides power to the pump as well as communications with the computer B Standard Connector Install the I O cable connector aligning the raised bump on the side of the connector with the large pin pin 1 ground on the Y cable OR MCBH Connector Install the I O cable connector aligning the pins 2 Connect the I O cable connector to your computer s serial port 18 Section 3 Power and Communications Test Test Note 1 Double click on SeaTerm exe If this is the first time the program is used See SEATERM s help files the setup dialog box may appear w SeaTerm Setup xj The initialization file SeaT erm ini was not found in the Windows directory Please enter the following setup information IMPORTANT To com
15. e firmware version serial number date and time ST e pressure sensor range and temperature compensation value CC e sampling crystal frequency real time clock frequency main battery voltage operating current not including pump or differential A D channels and back up lithium battery voltage e number of casts and samples in memory available sample space in memory and wait interval after each line of data LWx e stop logging on upcast when CTD ascents a percentage of full scale pressure sensor range CC line appears in status response only if set to Yes e number of scans averaged for each scan in memory and scan storage rate in memory CC e real time data transmission rate CC e minimum conductivity frequency for pump turn on CC e pump turn on delay CC e battery type CC e number of external voltages sampled and assignment of voltages to channels CC Example user input in bold command used to modify parameter in parentheses S DS SBE 25 CID V 4 1a SN 323 04 26 02 14 02 13 ST external pressure sensor range 5076 psia tcval 55 CC xtal 9437363 clk 32767 107 vmain 10 1 iop 175 vlith 5 6 ncasts 0 samples 0 free 54980 wait 0 msec LWx stop upcast when CTD ascends 30 of full scale pressure sensor range 2301 counts CTD configuration number of scans averaged 1 data stored at 8 scans per second CC real time data transmitted at 1 scans per second CC minimum conductivity freq
16. for f processing by our software DAx Same as DC but baud rate is 38400 These commands are included here for reference for users who DBx Same as DC but baud rate is 9600 are writing their own software e To save data to a file click DEx Same as DC but baud rate is 19200 Capture on SEATERM s Toolbar before entering a data DDb e upload command e See Data Formats Example user input in bold Upload all data in second cast cast 1 Click Capture on Toolbar and enter desired filename in dialog box S gt DC1 Upload data from scan b to scan e If b and e are omitted all data is uploaded First sample is 0 SBE 25 uploads data using baud rate for general communication which was set with SRx Example user input in bold Upload samples 0 through 199 Click Capture on Toolbar and enter desired filename in dialog box S DD0 199 DHb e Upload headers from header b to header e If b and e are omitted all headers are uploaded If only b is entered header b is uploaded First header is 0 A new header is written each time logging is started or resumed Header includes e cast number e month day hour minute and second when cast was started first and last sample in cast number of external voltages sampled number of scans averaged reason logging was halted batfail battery voltage too low switch off switch turned off recv cmd received null or Ctrl Z character timeout erro
17. ncasts 0 samples 0 free 54980 lwait 0 msec command This timeout algorithm is stop upcast when CTD ascends 30 of full scale pressure designed to conserve battery sensor range 2301 counts energy if the user does not send i id QS to put the SBE 25 to sleep eee cr capa number of scans averaged 1 data stored at 8 scans per second real time data transmitted at 1 scans per second If the system does not appear to respond click Connect on minimum conductivity frequency for pump turn on 2950 the Toolbar to reestablish pump delay 45 seconds communications battery type ALKALINE 7 external voltages sampled stored voltage 0 external voltage 0 stored voltage 1 external voltage 1 stored voltage 2 external voltage 2 stored voltage 3 external voltage 3 stored voltage 4 external voltage 4 stored voltage 5 external voltage 5 stored voltage 6 external voltage 6 7 Command the SBE 25 to go to sleep quiescent state by typing QS and pressing the Enter key The SBE 25 is ready for programming and deployment 22 Section 4 Deploying and Operating SBE 25 Section 4 Deploying and Operating SBE 25 This section includes discussions of e Logging modes Normal and Standby Note Separate software manuals and e Pump operation Help files contain detailed information on installation setup e Real time setup and use of Sea Bird s real time data acquisition software and data processing soft
18. section includes contact information Quick Start procedure and photos of a standard SBE 25 shipment About this Manual This manual is to be used with the SBE 25 SEALOGGER Conductivity Temperature and Pressure Recorder It is organized to guide the user from installation through operation and data collection We have included detailed specifications command descriptions maintenance and calibration information and helpful notes throughout the manual Sea Bird welcomes suggestions for new features and enhancements of our products and or documentation Please e mail any comments or suggestions to seabird seabird com How to Contact Sea Bird Sea Bird Electronics Inc 1808 136 Place Northeast Bellevue Washington 98005 USA Telephone 425 643 9866 Fax 425 643 9954 E mail seabird seabird com Website http www seabird com Business hours Monday Friday 0800 to 1700 Pacific Standard Time 1600 to 0100 Universal Time Except from April to October when we are on summer time 1500 to 0000 Universal Time Quick Start Follow these steps to get a Quick Start using the SBE 25 The manual provides step by step details for performing each task 1 Install batteries and test power and communications see Section 3 Power and Communications Test 2 Deploy the SBE 25 see Section 4 Deploying and Operating SBE 25 A Install new batteries if necessary B Ensure all data has been uploaded and then send IL to
19. several times Cause Solution 1 The I O cable connection may be loose Check the cabling between the SBE 25 and computer for a loose connection Cause Solution 2 The instrument type and or its communication settings may not have been entered correctly in SEATERM Select the SBE 25 in the Configure menu and verify the settings in the Configuration Options dialog box The settings should match those on the instrument Configuration Sheet Cause Solution 3 The I O cable may not be the correct one The I O cable supplied with the SBE 25 permits connection to standard RS 232 interfaces e SBE 25 Pin 1 large pin goes to DB 9 pin 5 ground e SBE 25 pin 2 counter clockwise from large pin goes to DB 9 pin 3 e SBE 25 pin 3 opposite the large pin goes to DB 9 pin 2 Cause Solution 4 In rare cases the program that controls the SBE 25 s microprocessor can be corrupted by a severe static shock or other problem This program can be initialized by using the reset switch Proceed as follows to initialize 1 Open the main housing battery end cap and remove the batteries see Battery Replacement Recharging in Section 5 Routine Maintenance and Calibration 2 There is a reset switch on the battery compartment bulkhead which is visible after the batteries are removed The switch is used to disconnect the back up lithium batteries from the electronics Set the switch to the reset position for at least 5 minutes 3 Reinstall or replace the batteri
20. silicone grease DC 4 or equivalent petroleum based lubricants as B Standard Connector Install the plug cable connector aligning the they will damage the connector raised bump on the side of the plug cable connector with the large pin pin 1 ground on the SBE 25 Remove any trapped air by burping or gently squeezing the plug connector near the top and moving your fingers toward the end cap OR MCBH Connector Install the plug cable connector aligning the pins C Place the locking sleeve over the plug cable connector Tighten the locking sleeve finger tight only Do not overtighten the locking sleeve and do not use a wrench or pliers Pressure Temperature Data I O pump and external power Conductivity Locking sleeve Dummy plug or cable Auxiliary single ended input sensors Auxiliary differential input sensors 2 Connect the other end of the cables installed in Step 1 to the appropriate sensors 3 Verify that the hardware and external fittings are secure 4 If applicable remove the Tygon tubing that was looped end to end around the conductivity cell for storage Reconnect the conductivity cell to the SBE 25 s plumbing 5 Immediately prior to deployment Normal Mode e With the SBE 25 in quiescent state for at least 3 seconds put the magnetic switch in the On position or e With the SBE 25 awake put the magnetic switch in the On position and then send GL or RL Standby
21. the battery pack from the housing Recharge the batteries Connect the battery charger leads to the battery cover pin jacks matching black to black and red to red the pin jacks are different sizes to prevent cross wiring Plug the battery charger into a suitable AC mains power source The red Charge LED on the charger comes on Recharging takes approximately 15 hours When recharging is complete the yellow Trickle LED comes on indicating the charger is providing a maintenance level charge Disconnect the battery pack from the charger and the charger from the power source Check the voltage at BAT and BAT on the battery cover It should be approximately 10 8 volts Reinstall the battery pack in the housing A Align the battery pack with the housing The posts inside the housing are not placed symmetrically so the battery pack fits into the housing only one way Looking at the battery bottom cover note that one circular cutout is closer to the edge than the others corresponding to the post that is closest to the housing Reinstall the three Phillips head screws and washers while pushing hard on the top of the battery pack to depress the spring contacts at the bottom of the compartment The screws must be fully tightened or the battery power to the circuitry will be intermittent Reinstall the battery end cap A Remove any water from the O rings and mating surfaces with a lint free cloth or tissue Inspect the
22. time SBE Data Processing or archived raw data Sea Bird also supplies a DOS software package e SBE Data Processing program for calculation and plotting of SEASOFT DOS This manual conductivity temperature pressure data from auxiliary sensors and only documents the use of derived variables such as salinity and sound velocity the Windows software with the SBE 25 but you can use the DOS software if desired See the SEASOFT DOS manual on CD ROM 10 Section 2 Description of SBE 25 Specifications Note Battery packs for Ni Cad and alkaline batteries differ you cannot put alkalines in the Ni Cad battery pack or vice versa Temperature C Conductivity S m Pressure 0 to full scale range expressed in meters of deployment depth Measurement 5 capability Range 5 to 35 0 to 7 20 100 350 600 1000 2000 3500 7000 meters fe Initial Accuracy 0 002 0 0003 0 1 of full scale range Oo Resolution 0 0003 0 00004 sol full scale range Sensor Calibration measurement 2 6 to 6 S m plus Ambient pressure to peso des hg 1 4 to 432 5 zero conductivity full scale range in reduced accuracy due air 5 steps to extrapolation errors Memory 1024 KByte standard 8 MByte optional Recorded Parameter Bytes sample Data Storage temperature conductivity pressure 8 0 each external voltage 1 5 Real Time Clock 32 768 Hz TCXO accurate to 1 minute year Nine alkaline
23. 4 auxiliary sensors T C and P 8 bytes sample External voltages 1 5 bytes sample x 4 sensors 6 bytes sample Storage space 1 024 000 8 6 73 142 samples Plumbing An SBE 25 is typically deployed in a vertical position However when used with an SBE 32 Carousel Water Sampler the SBE 25 may be deployed in a horizontal position Pump placement and plumbing for a horizontal mount is different than that for a vertical mount Sea Bird provides the system with pump placement and plumbing for the desired orientation at the time of purchase However you may reorient the system later as needed Failure to place the pump and plumbing properly can trap air preventing the pump from working properly Shown below are schematics of the system configuration for vertical and horizontal deployment 15 Section 2 Description of SBE 25 Vertical Mount e Place the exhaust as far from the intake as possible preferably in diagonally opposing corners so that exhaust water is not pulled into the intake Failure to place the exhaust away from the intake can lead to errors in temperature data because the pump transfers heat to the exhaust water e Place a13 mm 0 5 inch piece of 9 5 mm ID Tygon tubing at the dissolved oxygen DO sensor intake and exhaust Slide the larger diameter Tygon tubing 13 mm ID over the smaller diameter tubing to provide tight seals e Ifthe system does not include a DO sensor connect the tubing fr
24. 5 runs continuously during test drawing Diagnostic current Press Esc key or click Stop on SEATERM s Toolbar to stop test Measure and display main battery voltage 5 0161 back up lithium battery voltage 3 873 pressure voltage pressure VR temperature voltage and external voltages SBE 25 runs continuously during test drawing current Press Esc key or click Stop on SEATERM s Toolbar to stop test 68 A endix IV Replacement Parts Appendix IV Replacement Parts Part ET i Quantity Number Part Application Description in 25 Alkaline D cell batteries 22018 Duracell MN 1300 Power SBE 25 9 LR20 41124A Battery cover plate Retains alkaline batteries 1 80256 Ni Cad battery pack Rechargeable 9 battery pack 90226 Ni Cad battery charger For Ni Cad batteries 22009 Panasonic BR 2 3A Back up lithium cells on 2 lithium batteries Analog Interface PCB SBE 16 19 50092 Jackscrew Kit For removing connector end cap 1 Octyl Phenol Ethoxylate Reagent grade non ionic cleaning solution for BERE EUR S00 conductivity cell supplied in 100 i strength dilute as directed Tygon tube 1 2 inch ID x 30388 34 inch OD Main plumbing tubing 13 mm 0 5 inch long pieces used on 30579 Tygon eon SBE 43 intake and exhaust to fit to x inch OD main plumbing 171888 25 pin DB 25S to 9 pin For use with computer with DB 25 1 DB 9P cable adapter connector O rings and ha
25. 70 connector end cap to housing piston seal e 30072 Parker 2 017N674 70 Bulkhead Connector O Ring e 30804 SBE 4 L Seal LS001 e 231002 Backup ring for 30804 e 30806 L Seal LS021 main end cap L Seal all sensors except SBE 4 e 231004 Backup ring for 30806 e 30813 Morrison seal 026 hole 41 OD temperature probe Morrison seal Continued on next page 70 Appendix IV Replacement Parts Continued from previous page Part e Pee Quantity Number Part Application Description in 25 Includes cables connectors dummy plugs maintenance supplies and other mechanical spares e 17043 Locking sleeve secure cables amp dummy plugs e 17044 2 pin RMG 2FS dummy plug e 17045 3 pin RMG 3FS dummy plug e 17046 4 pin RMG 4FS dummy plug e 17047 6 pin AG 206 dummy plug e 17420 Dust cover protect connectors during storage e 17628 6 pin AG 306 HP SS bulkhead connector e 17652 2 pin XSG 2 BCL HP SS bulkhead connector e 17653 3 pin XSG 3 BCL HP SS bulkhead connector e 17654 4 pin XSG 4 BCL HP SS bulkhead connector e 30044 Seacat anode 1 e 30384 Tygon tubing 7 16 x 9 16 conductivity soaker hose e 30388 Tygon tubing 24 x 1 2 main CTD plumbing e 30409 Teflon tape adhesive 1 side insulation for metal parts to hose clamps SEALOGGER CTD 30411 Triton X 100 conductivity cell 50332 Support Kit SBE 25 cleaning solution S with standard e 30457 Parker Super O Lube silicon
26. Application Note 47 n NER aal if using 4 A D voltage Oxygen SBE 43 save current con file with a deck unit 5 A D voltage 1 Fluorometer Chelsea Aqua 3 settings connected to a NMEA 6 SPAR voltage Unavailable navigation device Por ee e 7 SEASAVE automatically 7 SPAR voltage SPAR Surface Irradiance adds current latitude longitude and universal time code to data header Select NMEA Lat Lon Interface in SEASAVE s Configure menu to control how Lat Lon data is incorporated Report Help Cancel 4 Click Save or Save As to save any changes to the con file Click Exit when done reviewing modifying the con file Click a sensor and click Modify to change Modity Click a non shaded sensor and click Select to pick a different sensor for that channel calibration coefficients for that sensor A dialog box with a list of sensors appears Select sensors after number of voltage channels have been specified above 51 Section 4 Deploying and Operating SBE 25 Editing Raw Data File Note Although we provide this technique for editing a raw hex file Sea Bird s strong recommendation as described above is to always convert the raw data file and then edit the converted file Sometimes users want to edit the raw hex data file before beginning processing to remove data at the beginning of the file corresponding to instrument soak time to remove blocks of bad data to edit the header
27. Cx DAx DBx or DEx S gt SR4 Example user input in bold Set baud rate to 4800 configure CTD Y N Are you sure Y N 30 Configure a number of parameters SBE 25 prompts you by displaying present value and asking for new value for each parameter Type in desired value and press Enter key To accept present value without change press Enter key In order SBE 25 prompts you as follows Y to continue or N to exit CC without making any changes Program requests verification before continuing character indicates Ctrl key Press Ctrl and y and press Enter key to continue press Ctrl and n and press Enter key to exit CC without making any changes Section 4 Deploying and Operating SBE 25 Setup Commands continued Notes e In place of Z each SBE 25 prompt shows the last programmed value for that parameter e If calculating elapsed time in SEASAVE real time data acquisition program SEASAVE uses the real time data output rate in the SBE 25 configuration con file The con file must match the selection in CC of real time data output rate View and edit the con file in SEASAVE or SBE Data Processing e If calculating elapsed time in SBE Data Processing post processing software SBE Data Processing uses the information in the hex file header to determine the sample rate File saved by SEASAVE during real time data acquisition SBE Data Processing uses the real
28. ERM prompts for beginning and ending cast numbers and uploads data within that range Separate file is written for each cast with 3 digit cast identification number appended to user selected file name Note Set up Upload Settings Header Information and or Header Form Steps 2 through 4 e The first time you upload data and e If you want to change upload or header parameters SBE 3 temperature sensor and 4 SBE 3 SBE 4 conductivity sensor serial numbers must match numbers in CTD con file for processing uploaded data using SBE 3 Serial Number SBE 4 Serial Number Sea Bird software Cancel Default Help Make the selection for Upload Settings 47 Defines header information included with e Prompt for header information Each COM Settings time data is uploaded user is prompted uploaded data S ection 4 Deploying and Operating SBE 25 3 Click on the Header Information tab The dialog box looks like this SBE 25 Configuration Options Upload Settings il to fill out user defined header form Include default header form in upload file Header Information User defined default header form included in upload file User is not o Prompt for header information prompted to add any information when data is uploaded Don t include default header form in C Don t include default header form in the upload file upload file U
29. IE 3358 decimal voltage 3358 819 4 100 volts After these equations are applied to the raw data apply the calibration coefficients see the calibration sheet for each sensor resulting in converted data in engineering units 39 Section 4 Deploying and Operating SBE 25 Optimizing Data Quality Our deployment recommendations are only general guidelines and are focused primarily on maximizing data quality Actual sea state conditions and winch and deck gear configurations may require some adaptation in order to achieve best data quality and avoid mechanical problems The SBE 25 is optimized for profiling rates of 0 5 to 2 meters second with meter second generally providing the best compromise between data quality and profile resolution The SBE 25 pump maintains a constant and optimum flow rate which ensures that the sensor response times are not dependent on the descent rate Adjust the descent rate of the SBE 25 based on the amount of ship motion i e sea state imparted to the cable and the size weight and drag of the underwater package at the end of the cable Generally use a faster lowering rate in rougher seas allowing the SBE 25 to stay clear of turbulent wakes that are shed downward when the ship heaves up shed wakes are an error source from which all CTDs suffer When the sea is very calm the SBE 25 can be lowered more slowly for example 10 to 20 cm second to give greater vertical resolution
30. Mode e With the SBE 25 awake send SB Wait at least 3 seconds and then put the magnetic switch in the On position The SBE 25 is ready to go into the water 43 Section 4 Deploying and Operating SBE 25 Acquiring Real Time Data with SEASAVE Note When Sea Bird ships a new instrument we include a con file that reflects the current instrument configuration as we know it The con file is named with the instrument serial number followed with the con extension For example for an instrument with serial number 2375 Sea Bird names the con file 2375 con You may rename the con file if desired this will not affect the results Used to determine strain gauge pressure sensor data format See reply from status DS e Surface PAR Select if Surface PAR voltage added by deck unit Selecting Surface PAR voltage adds 2 channels to Channel Sensor table Do not increase External voltage channels to reflect this External voltage channels reflects only external voltages going directly to SBE 25 from auxiliary sensors See Application Note 47 NMEA Select if using with a deck unit connected to a NMEA navigation device SEASAVE automatically adds current latitude longitude and universal time code to data header Select NMEA Lat Lon Interface in SEASAVE s Configure menu to control how Lat Lon data is incorporated mite eh 13 6115951 362 0 12 number programmed into SBE 25 with CC see reply f
31. RM prompts for beginning and ending scan sample numbers and uploads all data within range into one file From a single cast SEATERM prompts for cast number and uploads all data from that cast into one file Physical Handling 1 Rinse the conductivity cell with fresh water See Section 5 Routine Maintenance and Calibration for cell cleaning and storage If the batteries are exhausted new batteries must be installed before the data can be extracted Stored data will not be lost as a result of exhaustion or removal of batteries See Section 5 Routine Maintenance and Calibration for replacement of batteries If immediate redeployment is not required it is best to leave the SBE 25 with batteries in place and in a quiescent state QS Because the quiescent current required is only 150 microamps the batteries can be left in place without significant loss of capacity Uploading Data 1 2 Double click on SeaTerm exe The display shows the main screen In the Configure menu select SBE 25 Click on the Upload Settings tab The dialog box looks like this SBE 25 Configuration Options x COM Settings Header Information Upload Baud rate Select baud rate for uploading data from SBE 25 to computer Upload Settings Upload data C Allas a single file All separated by cast C By scan number range From a single cast C By cast number range By cast number range SEAT
32. RM will be saved to the designated file Process the data as desired Note that this file cannot be processed by SEASAVE or SBE Data Processing as it does not have the required headers and format for Sea Bird s processing software 27 Section 4 Deploying and Operating SBE 25 Timeout Description The SBE 25 has a timeout algorithm If the SBE 25 does not receive a command or sample data for 2 minutes it powers down its main digital circuits This places the SBE 25 in quiescent sleep state drawing minimal current To re establish control wake up click Connect on SEATERM s Toolbar or press the Enter key The system responds with the S prompt Command Descriptions This section describes commands and provides sample outputs See Appendix III Command Summary for a summarized command list When entering commands e Input commands to the SBE 25 in upper or lower case letters and register commands by pressing the Enter key e The SBE 25 sends if an invalid command is entered e Ifthe system does not return an S prompt after executing a command press the Enter key to get the S prompt e If anew command is not received within 2 minutes after the completion of a command the SBE 25 returns to the quiescent sleep state and the display indicates time out e fin quiescent state re establish communications by clicking Connect on SEATERM s Toolbar or pressing the Enter key to get an S gt prompt e Commands followed by
33. SBE 25 SEALOGGER CTD Conductivity Temperature and Pressure Recorder with RS 232 Interface Shown with optional auxiliary sensors User s Manual Sea Bird Electronics Inc 1808 136 Place NE Bellevue Washington 98005 USA Telephone 425 643 9866 Fax 425 643 9954 Manual Version 013 08 03 05 E mail seabird 9 seabird com With IMB Memory Firmware Version 4 0c and later Website www seabird com With 8 MB Memory Firmware Version 4 1b and later Limited Liability Statement Extreme care should be exercised when using or servicing this equipment It should be used or serviced only by personnel with knowledge of and training in the use and maintenance of oceanographic electronic equipment SEA BIRD ELECTRONICS INC disclaims all product liability risks arising from the use or servicing of this system SEA BIRD ELECTRONICS INC has no way of controlling the use of this equipment or of choosing the personnel to operate it and therefore cannot take steps to comply with laws pertaining to product liability including laws which impose a duty to warn the user of any dangers involved in operating this equipment Therefore acceptance of this system by the customer shall be conclusively deemed to include a covenant by the customer to defend indemnify and hold SEA BIRD ELECTRONICS INC harmless from all product liability claims arising from the use or servicing of this system Table of Contents Table of Contents Section I In
34. Setup Commands continued number of external voltages to sample 0 7 Z new value Number of external voltages to sample Factory configuration is in configuration section at beginning of manual If number of external voltages is greater than 0 program prompts sample external volt 0 y n Z new value answer Y for voltages you wish to sample External voltage corresponds to wiring of sensor to an input channel on SBE 25 s end cap See End Cap Connectors in Section 2 Description of SBE 25 Stored voltage corresponds to voltage number specified in SBE 25 con file Example user input in bold You have connected sensors to two SBE 25 A D channels transmissometer connected to Voltage 4 on J5 and PAR connected to Voltage 6 on J6 In the con file set up in the Configure menu in SEASAVE or SBE Data Processing you set up voltage 0 for the transmissometer and voltage 1 for the PAR In SEATERM send CC S cc omitting details on all prompts except for external voltages number of external voltages to sample 0 7 0 new value 2 Sample external volt 0 y n NO new value n Sample external volt 41 y n NO new value n Sample external volt 42 y n NO new value n Sample external volt 43 y n NO new value n Sample external volt 4 y n NO new value y transmissometer Sample external volt 45 y n NO new value n Sample external volt 6 y n NO new value y PAR When finished a s
35. TD Deck Unit PDIM SBE 19 19plus or 25 e SBE 32 Carousel Water Sampler and Auto Fire Module AFM The AFM mounted on or near the SBE 25 allows the SBE 32 to operate autonomously on non conducting cables The AFM supplies the operating voltage logic and control commands necessary to operate the SBE 32 The AFM monitors the pressure data recorded by the SBE 25 in real time closing water sampler bottles at predefined pressures depths or whenever the system is stationary for a specified period of time Bottle number firing confirmation and five scans of CTD data are recorded in the AFM memory for each bottle fired See the AFM manual for system operating details wire rope no conductors SBE 32 Carousel SBE 19 19p us or 25 CTD or SBE 50 Pressure Sensor Section 2 Description of SBE 25 The SBE 25 is supplied with a powerful Win 95 98 NT 2000 XP software Notes package SEASOFT Win32 which includes e Help files provide detailed information on the use of e SEATERM terminal program for easy communication and SEATERM SeatermAF data retrieval SEASAVE and SBE Data Processing e SeatermAF terminal program for easy communication and data Separate software manuals retrieval when the SBE 25 is used with the Auto Fire Module and SBE 32 on CD ROM contain detailed Carousel Water Sampler see the AFM manual information on the setup and use of SEASAVE and e SEASAVE program for acquiring converting and displaying real
36. a ena pump and to data I O cable to computer 4 tec SBE 29 pressure sensor The SBE 25 SEALOGGER measures conductivity temperature and pressure in marine or fresh water environments at depths up to 6800 meters 22 300 feet Additionally the SBE 25 powers and interfaces with up to seven auxiliary sensors Designed for applications where vertical profiles of the measured parameters are required the SBE 25 runs continuously and samples at eight scans per second 8 Hz The SBE 25 can be set to average up to eight samples storing and transmitting only the averaged data The SBE 25 s main battery recorder housing contains the acquisition electronics microprocessor controller memory and batteries bulkhead connectors for the modular sensors are mounted on the housing s bottom end cap The SBE 25 uses Sea Bird s modular SBE 3F Temperature Sensor and SBE 4C Conductivity Sensor The SBE 25 also includes the SBE 5T Submersible Pump and TC Duct The pump controlled TC ducted flow configuration significantly reduces salinity spiking caused by ship heave and in calm waters allows slower descent rates for improved resolution of water column features Pressure is measured by the modular SBE 29 Temperature Compensated Strain Gauge Pressure Sensor available in eight depth ranges to suit the operating depth requirement Nine D size alkaline batteries provide 24 hours operation for a system without auxiliary sensors or 4 hours oper
37. aintenance eese ener 57 Pressure Sensor Maintenance sese 57 Pump Maintenance uiid pene E REED een 57 Sensor Calibration itte rr erdt eR rr OR dr e GRE 58 Section 6 Troubleshooting 4 eee e eere eee eere eee ee seen aestas eee 60 Problem 1 Unable to Communicate with SBE 25 sss 60 Problem 2 No Data Recorded sese 61 Problem 3 Nonsense or Unreasonable Data eee 61 DIA T 62 Appendix I Functional Description and Circuitry 63 Sensors and Sensor Interface c cescceseeseessecesecececeeeeseeeeeeeeeeseeeeseeereneeensees 63 Sensor Frequency Ranges essent 63 Resolution CT Channels asiana eatr S EEE e AE E A 63 Accuracy CT Channels 2 ideae ite e Ru ir eene 64 Auxiliary Sensor Voltage Ranges eese 64 Accuracy and Resolution Pressure and Voltage Channels 64 Real Time Clock noni ode e ate n wies ea ee Beati drn 64 Battery Wing nina tete RR A utate dete exi itd 65 Appendix II Electronics Disassembly Reassembly 66 Appendix III Command Summary eee eeee ee eee ee eene eene 68 Appendix IV Replacement Parts ccce eee ee ee ee eee eene eene 69 j 73 Section 1 Introduction Section 1 Introduction This
38. ally set to 0 increase for very slow computers Range 0 65535 IR Initialize memory which destroys all logged data in memory Enter quiescent sleep state Main power turned off but QS memory retention unaffected After all previous data has been uploaded send IL before IL starting to log to make entire memory available for recording If not sent data stored after last sample if logging is started with magnetic switch Logging GL Start logging now overwriting any data in memory Magnetic switch must be On before sending GL RL Resume logging now storing data to memory after existing data Magnetic switch must be On before sending RL SB Put SBE 25 in Standby Mode Upload data from cast x at 600 baud If x omitted data from DCx 3 cast 0 is uploaded DAx Same as DC but baud is 38400 Data Upload DBx Same as DC but baud is 9600 Stop logging DEx Same as DC but baud is 19200 before Display data from scan b to scan e using same baud rate as uploading DDb e used for general communication SRx If b and e omitted data from all casts are uploaded Upload headers from header b to header e using same baud DHb e rate as used for general communication SRx If b and e omitted headers from all casts are uploaded TM Perform memory test which destroys all logged data in memory TE Perform extended memory test which destroys all logged data in memory Measure and display temperature and conductivity FR frequency SBE 2
39. ated before and after deployment but particularly when the cell has been exposed to contamination by oil slicks or biological material Temperature Sensor The primary source of temperature sensor calibration drift is the aging of the thermistor element Sensor drift will usually be a few thousandths of a degree during the first year and less in subsequent intervals Sensor drift is not substantially dependent upon the environmental conditions of use and unlike platinum or copper elements the thermistor is insensitive to shock 58 Section 5 Routine Maintenance and Calibration Pressure Sensor The SBE 29 strain gauge pressure sensor is capable of meeting the SBE 25 s error specification with some allowance for aging and ambient temperature induced drift Pressure sensors show most of their error as a linear offset from zero A technique is provided below for making small corrections to the pressure sensor calibration using the offset calibration coefficient term by comparing SBE 25 pressure output to readings from a barometer Allow the SBE 25 to equilibrate with power on in a reasonably constant temperature environment for at least 5 hours before starting Pressure sensors exhibit a transient change in their output in response to changes in their cad environmental temperature Sea Bird instruments are constructed to minimize port this by thermally decoupling the sensor from the body of the instrument However there is still
40. ation for a fully loaded system The standard 1024 Kbyte memory records 4 4 hours of conductivity temperature and strain gauge pressure data while sampling at 8 scans per second other configurations setups vary 8 Mbyte optional memory available Simultaneous real time monitoring is possible using the SBE 25 s opto isolated RS 232C interface Setup diagnostics and data extraction are performed without opening the housing A standard SBE 25 is supplied with e Plastic main housing for depths to 600 meters 1950 feet e Modular temperature SBE 3F conductivity SBE 4C and strain gauge pressure SBE 29 sensors e T C Duct which ensures that Temperature and Conductivity measurements are made on the same parcel of water e SBE 5T submersible pump for pumped conductivity by fixing the flow to a constant rate the pump ensures a constant conductivity time response e Seven 12 bit A D input channels for optional auxiliary sensors four single ended two differential and one log amplified for PAR sensor e 1024 Kbyte memory e OD size alkaline batteries Duracell MN1300 LR20 e Glass reinforced epoxy bulkhead connectors e Protective cage with lifting eye ring 7 Section 2 Description of SBE 25 SBE 25 options include e Aluminum housing for use to 3400 meters 11 100 feet or 6800 meters 22 300 feet e 8 Mbyte memory e Wet pluggable MCBH connectors in place of standard connectors e Optional auxiliary sensors for dis
41. baud rate to upload data Computer COM port baud rate data bits and parity for communication between computer and SBE 25 C Version less than 3 0 Version 3 0 or greater COMM Port Baud Rate Interface for communication between computer and SBE 25 r Mode RS 232 Full Duplex C RS485 Hal Duplex C Inductive Modem gt Modem R5485 ID C Prompt D C Automatically get ID Notes e SEATERM s baud rate must be the same as the SBE 25 s baud rate set with SRx Baud is factory set to 600 but can be changed by the user see Command Descriptions in Section 4 Deploying and Operating SBE 25 e When you click OK SEATERM saves the Configuration Options settings to the SeaTerm ini file in your Windows directory SeaTerm ini contains the last saved settings for each instrument When you open SEATERM and select the desired instrument SBE 19 25 etc in the Configure menu the Configuration Options dialog box shows the last saved settings for that instrument Make the selections in the Configuration Options dialog box e COMM Port COM 1 through COM 10 as applicable e Baud Rate 600 documented on Configuration Sheet e Data Bits 7 e Parity Even e Mode RS 232 Full Duplex Click OK to save the settings If you did not enter the temperature and conductivity sensor serial numbers on the Upload Settings tab SEATERM responds Temperature or cond
42. ces for dirt nicks and cuts Clean or replace as necessary Apply a light coat of o ring lubricant Parker Super O Lube to O rings and mating surfaces B Carefully fit the end cap into the housing and rethread the end cap into place Use a wrench on the white plastic bar to ensure the end cap is tightly secured Verify that the magnetic switch is Off so the SBE 25 will be in quiescent sleep state 55 Section 5 Routine Maintenance and Calibration Unthread cap by rotating counter clockwise Screw typical Tab on cord Pin jacks CAUTION Do not recharge the battery pack while it is in the housing If you do so you may damage the SBE 25 electronics 1 Recharging Nickel Cadmium Batteries Remove the main housing battery end cap end cap without connectors A B C D Wipe the outside of the end cap and housing dry being careful to remove any water at the seam between them Unthread the end cap by rotating counter clockwise use a wrench on the white plastic bar if necessary Remove any water from the O ring mating surfaces inside the housing with a lint free cloth or tissue Put the end cap aside being careful to protect the O ring from damage or contamination Remove the battery pack from the housing A B Remove the three Phillips head machine screws and washers from the battery cover plate inside the housing Pull on the plastic tab on the center cord to remove
43. cleaning or storage sensor attach Tygon tubing to end of TC Duct to loop Tygon tubing to each end of cell Conductivity quick disconnect press metal lever and disconnect plumbing from cell to loop Tygon tubing to each end of cell Pressure Sensor Maintenance The SBE 29 s nylon pressure capillary fitting which includes a pressure port fitting and an external capillary tube is filled with silicone oil The oil transmits hydrostatic pressure via internal stainless steel capillary tubing to the pressure sensor inside the instrument and prevents corrosion that might occur if the sensor diaphragm was exposed to water The internal tubing and nylon capillary fitting are vacuum back filled at the factory Because of the viscosity of the silicone oil and capillary action the silicone oil does not run out of the external capillary tube However due to temperature and pressure cycling over long periods it is normal for some oil to slowly leak out of the external capillary tube When the oil is not visible or is receding inside the translucent tube or if the fitting has been damaged refill the oil BE 29 using the supplied pressure sensor oil refill kit See Application Note 12 1 pressure Pressure Port Oil Refill Procedure amp Nylon Capillary Fitting Replacement port Pump Maintenance See Application Note 75 Maintenance of SBE 5T and 5M Pumps for details 57 Sensor Calibration Note After recal
44. cy F CTD reference frequency 9 437 184 Hz At 2 kHz the resolution is 0 0076 Hz bit and at 50 kHz the resolution is 0 191 Hz bit To get resolution in engineering units divide by sensitivity for example Hz C To compute nominal values of resolution in engineering units we use the approximate values for sensitivity Sen from the sensor specification sheets The values given here are for illustration only your computer must use the more exact equations and specific calibration constants for each sensor to convert to engineering units Temperature At 1 C F 6 kHz and Sensitivity 146 Hz C At 31 C F 12 kHz and Sensitivity 233 Hz C Resolution 0 00016 C bit at 1 C 0 00020 C bit at 31 C 63 Appendix I Functional Description and Circuitry Conductivity At 1 4 Siemens meter S m F 5 kHz and Sensitivity 1900 Hz S m At 5 8 S m F 11 kHz and Sensitivity 960 Hz S m Resolution 0 00001 S m per bit at 1 4 S m 0 00004 S m per bit at 5 8 S m Accuracy CT Channels The accuracy of the system is determined by the accuracy of the sensors used and by the accuracy of the crystal oscillator used to generate the reference frequency F F is stable to within 5 ppm over the range of 0 to 50 C Any error in F causes a corresponding error in computed sensor frequency F A 5 ppm error in F would cause a 0 06 Hz error if F 12 000 Hz This in turn would resu
45. d data if Include default header form in upload file was selected in the Configuration Options dialog box Step 3 Enter the desired header header prompts Click OK 48 Section 4 Deploying and Operating SBE 25 5 Click Connect on the Toolbar to begin communications with the SBE 25 The display looks like this SBE 25 SEALOGGER CTD power on S This shows that correct communications between the computer and the SBE 25 has been established If the system does not respond as shown above e Click Connect again e Check cabling between the computer and the SBE 25 e Verify the correct instrument was selected and the COM settings were entered correctly in the Configure menu 6 Command the SBE 25 to stop data logging by e Moving the magnetic switch to the Off position or e Typing Ctrl Z or clicking Stop on the Toolbar 7 Display SBE 25 status information by clicking Status on the Toolbar The display looks like this SBE 25 CID V 4 1a SN 323 04 26 02 14 02 13 external pressure sensor range 5076 psia tcval 55 xtal 9437363 clk232767 107 vmain 10 1 iop 175 vlith 5 6 ncasts 0 samples 0 free 54980 lwait 0 msec 9 stop upcast when CTD ascends 30 of full scale pressure sensor range 2301 counts CTD configuration number of scans averaged 1 data stored at 8 scans per second real time data transmitted at 1 scans per second minimum conductivity frequency for pump turn on 2950 pump delay
46. der Note information and click OK To prepare the SBE 25 for E In the Open dialog box enter the desired upload file name and click re deployment OK The upload file has a hex extension 1 After all data has been uploaded If you selected All separated by cast or By cast number range send IL If IL is not sent and the SEATERM automatically appends the 3 digit cast identification magnetic SwITen Is Uspd 30 start number to the upload file name for example if you specify the logging new data will be stored after the last recorded sample upload file name as fest and upload casts 0 and 1 SEATERM creates preventing use of the entire test000 hex and test001 hex memory capacity F SEATERM sends the data upload command DCx DAx DBx DEx 2 Send QS to put the SBE 25 in or DDb e as applicable quiescent sleep state until G When the data has been uploaded SEATERM shows the S gt prompt ready to redeploy Quiescent current is only 150 microamps 9 Ensure all data has been uploaded from the SBE 25 by reviewing and so the batteries can be left in processing the data place without significant loss of capacity A Use SEASAVE to display the raw unprocessed data from the SBE 25 in engineering units see SEASAVE manual Help files B Use SBE Data Processing to process the data and plot the processed data see SBE Data Processing manual Help files 50 Section 4 Deploying and Operating SBE 25 Processing Data Note 1 Conve
47. e Minimum conductivity frequency Hz to enable pump turn on to prevent pump from turning on before SBE 25 is in water Pump will not turn on until pump delay seconds see next prompt after minimum conductivity frequency is reached allowing time for Tygon tubing and pump to fill with water after SBE 25 is submerged Pump stops when conductivity frequency drops below minimum conductivity frequency SBE 25 Configuration Sheet lists uncorrected raw frequency output at 0 conductivity Typical value and factory set default for salt water and estuarine application is 0 conductivity frequency 500 Hz Typical value for fresh water applications is 0 conductivity frequency 5 Hz pump delay Z new value Time seconds to wait after minimum conductivity frequency is reached before turning pump on Typical value 30 45 seconds 31 Section 4 Deploying and Operating SBE 25 Setup Commands continued stop CTD on upcast y n Z new value 20 of full scale range If N SBE 25 logs until stopped by putting magnetic switch in Off position or by typing Ctrl Z or clicking Stop on SEATERM s Toolbar If Y SBE 25 stops logging on upcast turns off power to all sensors and enters quiescent sleep state to maximize battery endurance and memory capacity If you enter Y program prompts Stop upcast when CTD ascends x of FSR x Z new x Upcast is considered to have begun when pressure sensor reading i
48. e connectors based o ring lubricant e 41124A Seacat battery cover plate battery retainer plate e 50025 Pressure sensor oil refill kit e 50026 Magnetic switch assembly e 50029 Pressure sensor capillary assembly e 50069 SBE 25 small hardware amp o ring kit see above e 17086 3 pin RMG 3FS to 3 pin RMG 3FS cable 0 6 m 2 1 ft long temperature amp conductivity sensor cables e 17168 6 pin AG 206 to 6 pin AG 206 cable 1 1 m 3 7 ft long pressure sensor cable e 801225 4 pin RMG 4FS to 9 pin DB 9S 2 4 m 8 ft data I O cable for bench use from SBE 25 J1 Y cable 17709 to computer e 801380 4 pin RMG 4FS to 9 pin DB 9S shielded I O cable 20 m 66 ft long for real time logging from SBE 25 J1 Y cable 17709 to computer e 17709 6 pin AG 206 to 2 pin RMG 2FS and 4 pin RMG 4MP Pump Data I O Y cable from SBE 25 J1 to pump 2 pin and data I O 4 pin Continued on next page 71 Appendix IV Replacement Parts Continued from previous page Part e Pee Quantity Number Part Application Description in 25 Includes cables connectors dummy plugs maintenance supplies and other mechanical spares e 171192 Locking sleeve secure cables amp dummy plugs e 171497 2 pin MCDC 2 F dummy plug e 171500 3 pin MCDC 3 F dummy plug e 171398 4 pin MCDC 4 F dummy plugs e 171498 6 pin MCDC 6 F dummy plug e 171726 6 pin MCBH 6MAS bulkhead connector e 171723 2 pin MCBH 2MAS bulkhead co
49. e data sample containing temperature conductivity pressure and optional auxiliary inputs SEASAVE Sea Bird s Win 95 98 NT 2000 XP software used to acquire convert and display real time or archived raw unprocessed data SEASOFT DOS Sea Bird s complete DOS software package which includes software for communication real time data acquisition and data analysis and display SEASOFT Win32 Sea Bird s complete Win 95 98 NT 2000 XP software package which includes software for communication real time data acquisition and data analysis and display SEASOFT Win32 includes SEATERM SeatermAF SEASAVE SBE Data Processing and Plot39 SEATERM Sea Bird s Win 95 98 NT 2000 XP terminal program used to communicate with the SBE 25 SeatermAF Sea Bird s Win 95 98 NT 2000 XP terminal program used to communicate with the SBE 25 when it is used with an Auto Fire Module AFM See the AFM manual TCXO Temperature Compensated Crystal Oscillator Triton X 100 Reagent grade non ionic surfactant detergent used for cleaning the conductivity cell Triton can be ordered from Sea Bird but should also be available locally from chemical supply or laboratory products companies Triton is manufactured by J T Baker Mallinkrodt Baker Inc see http www jtbaker com distrib distrib asp seg lab for local distributors 62 A endix I Functional Description and Circuitr Appendix I Functional Description and Circuitry Senso
50. easure and display voltages read by A D converter Column Output 1 Main battery voltage 5 0161 Back up lithium battery voltage 3 873 3 Pressure voltage 4 Pressure temperature voltage 5 and up External voltages if enabled SBE 25 runs continuously during test drawing current Press Esc key or click Stop on SEATERM s Toolbar to stop test 38 Section 4 Deploying and Operating SBE 25 Data Format The SBE 25 outputs data in raw hexadecimal form as described below Eight to nineteen bytes are stored per CTD scan depending on the number of external voltages for auxiliary sensors enabled If the specified voltage is not enabled see Command Descriptions the corresponding data is not included in the output data stream shortening the data string The format is External Voltages Enabled Data Format 0 ttttttecccccsppp 1 ttttttecccccspppOuuu 2 ttttttccccccspppuuuvvv 3 ttttttccccccspppuuuvvvOwww 4 ttttttccccccspppuuuvvvWWWXXXx 5 ttttttccccccspppuuuvvvwwwxxxOyyy 6 ttttttccccccspppuuuvvvWWWXXXyyyZZZ 7 ttttttccccccspppuuuvvvwWWxxxyyyzzz0 aaa where tttttt temperature frequency 3 bytes cccccc conductivity frequency 3 bytes s sign character for pressure sign character 0 sign character 4 ppp pressure 12 bits uuu stored voltage output 0 12 bits vvv stored voltage output 1 12 bits www stored voltage output 2 12 bits XXX stor
51. ed voltage output 3 12 bits yyy stored voltage output 4 12 bits zzz stored voltage output 5 12 bits aaa stored voltage output 6 12 bits 0 zero used to provide an even number of characters 4 bits Calculation of each parameter from the data is described below use the decimal equivalent of the hex data in the equations Note e Frequency temperature or conductivity Sea Bird s data processing software byteO 256 bytel byte2 256 uses the equations shown as well as e pressure corrected A D counts ppp h i h P ai c E d x raw e voltage uuu 819 similar form for all voltage auxiliary sensors data to engineering units Alternatively you can use the Example SBE 25 with 2 external voltages sampled equations to develop your own example scan ttttttccccccspppuuuvvv processing software 1FE780281D1904293F2D1E e Temperature tttttt 1FE780 1F 31 decimal E7 231 decimal 80 128 decimal temperature frequency 31 256 231 128 256 8167 500 Hz Conductivity cccecc 281D19 28 40 decimal 1D 29 decimal 19 25 decimal conductivity frequency 40 256 29 25 256 10269 098 Hz Strain gauge pressure sppp 0429 Pressure sign character s 0 corrected A D counts ppp 429 1065 decimal corrected pressure A D counts 1065 First external voltage uuu 3F2 1010 decimal voltage 1010 819 1 233 volts Second external voltage vvv D
52. eflects this choice 0 7 Must agree with mite aN imate i evan number programmed into SBE 25 with CC see reply from status Used to determine strain DS Voltage channel 0 in con file corresponds to first external gauge pressure sensor data ASCII file opened None voltage in data stream voltage channel 1 to second external format See reply from status DS voltage in data stream etc External voltage channels 7 w 1 2 4 or 8 scans second Used to calculate elapsed e Surface PAR Select if peal Version gt 2 0 zl time if you select time as a parameter for a display Surface PAR voltage window For elapsed time calculation to be correct added by deck unit Real time data output rate 1 scan sec this entry must agree with number programmed into Selecting Surface PAR ONE i 2 channels Surface PAR voltage added to Channel Sensor table de Shaded sensors cannot be removed or changed to another Do not increase External NMEA position data added type of sensor All others are optional voltage channels to reflect this External Channel Sensor SBE 25 with CC see reply from status DS New to create new voltage channels reflects only external voltages BESEISEHE PETRUS con file for this CTD going directly to SBE 25 2 Frequency Conductivity Open to select from auxiliary sensors 3 Pressure voltage Pressure Strain Gauge je different con file poo Save or Save As to See
53. en to file may be useful for diagnostics File Capture has cap extension Click Capture again to turn off capture Capture status displays in Status bar Upload data stored in memory in format Sea Bird s data processing software can DCx DAx DBx use raw Hex Uploaded data has hex DEx or DDb e extension Before using Upload use Upload button Upload e Configure upload and header if you will be parameters in Configure menu processing data with e Stop logging SBE Data put switch in Off position send Processing Ctrl Z or click STOP on Toolbar Perform one or more diagnostic tests on SBE 25 Diagnostic test s accessed Diagnostics in this manner are non destructive DS J FR VR they do not write over any existing instrument settings Interrupt and end current activity such as PD logging uploading or diagnostic test type Ctrl Z Free computer COM port used to Disconnect communicate with SBE 25 COM port can then be used by another program See Command Descriptions in Section 4 Deploying and Operating SBE 25 20 Section 3 Power and Communications Test 3 In the Configure menu select SBE 25 The dialog box looks like this SBE 25 Configuration Options Version listed as Firmware Version Digital Board EPROM Version or Memory Board EPROM version on Configuration Sheet affects baud rate for uploading data Older versions do not allow changing
54. ent on the mode and setup See the detailed mode descriptions in Normal Mode and Standby Mode Normal Mode and using the magnetic switch to start and stop logging The SBE 25 must be in quiescent sleep state before putting the magnetic switch in the On position The first time logging is started after logging was initialized IL data recording starts at the beginning of memory and any previously recorded data is written over When the switch is put in the Off position recording stops Each time the switch is put in the On position again recording continues with new data stored after the previously recorded data and a new header written to indicate the incremented cast number date time and sample numbers contained in the cast Example user input in bold S 0S S time out SBE25 automatically times out if 2 minutes elapse without a command even if you do not send QS wait at least 3 seconds after time out appears then put switch in On position hex data displays on SEATERM screen after a few seconds Normal Mode and using commands to start logging See GL and RL below IL Initialize logging after all previous data has been uploaded from SBE 25 initialize logging before starting to log again to make entire memory available for recording IL sets sample number and header and cast number to 0 internally If these are not set to 0 data will be stored after last recorded sample if you use magnetic switch to s
55. es and close the battery end cap 4 Establish communications with the SBE 25 see Section 3 Power and Communications Test Initialize RAM IR reset the date and time ST and re enter all the setup parameters 60 Section 6 Troubleshootin Problem 2 No Data Recorded Cause Solution 1 The SBE 25 may not have been in quiescent sleep state when you slid the magnetic switch to the On position If using the magnetic switch to start logging the SBE 25 must be in quiescent state for at least 3 seconds before sliding the magnetic switch to the On position or logging will not start Place the SBE 25 in quiescent state by sending QS or waiting at least 2 minutes after sending the last command and receiving a response Cause Solution 2 The SBE 25 s memory may be full or you may have reached the maximum number of casts 100 once this occurs no further data is recorded Verify using DS free 0 if memory is full ncasts 100 if maximum number of casts have been recorded Sea Bird recommends that you upload all previous data before beginning another deployment Once the data is uploaded use IL to reset the memory After the memory is reset DS will show ncasts 0 and samples 0 Problem 3 Nonsense or Unreasonable Data The symptom of this problem is an uploaded file that contains nonsense values for example 9999 999 or unreasonable values for example values that are outside the expected range of the data Cause Soluti
56. es etc do not thermally contaminate the water that flows past the sensors Where the water temperature is very different from the temperature at which the SBE 25 has been stored better results are obtained if the SBE 25 is allowed to equilibrate to the water temperature at the surface soak for several 3 5 minutes before beginning the profile The reason is not that the electronics are temperature sensitive they are not but that the thermal influence of the instrument housing on the water entering the cell will be reduced If the difference between water and storage temperature is extreme allow more soak time 40 Section 4 Deploying and Operating SBE 25 Note See SBE Data Processing s Help files for information on data processing modules that can correct data for the influences of ship motion and minimize salinity spiking When very heavy seas cause severe ship motion the SBE 25 descent can actually stop or reverse direction if the ship heaves upward faster than the package can descend These occurrences can often be seen as loops in the real time temperature trace If the winch payout rate is too high a loop of wire can form under water when the package descent is slowed or reversed by ship heave and the winch is still paying out wire Inevitably the loop formation gets out of phase with the heave and the loop closes on itself when the ship heaves causing a kink If the package includes a Carousel Water Sampler as we
57. ibration Sea Bird ships the sensors back to the user with an updated configuration con file and Calibration Certificates showing the new coefficients Section 5 Routine Maintenance and Calibration Sea Bird sensors are calibrated by subjecting them to known physical conditions and measuring the sensor responses Coefficients are then computed which may be used with appropriate algorithms to obtain engineering units The conductivity temperature and pressure sensors on the SBE 25 are supplied fully calibrated with coefficients printed on their respective Calibration Certificates see back of manual and stored in the instrument configuration con file We recommend that the SBE 25 be returned to Sea Bird for calibration Conductivity Sensor The SBE 4 conductivity sensor incorporates a fixed precision resistor in parallel with the cell When the cell is dry and in air the sensor s electrical circuitry outputs a frequency representative of the fixed resistor This frequency is recorded on the Calibration Certificate and should remain stable within 1 Hz over time The primary mechanism for calibration drift in conductivity sensors is the fouling of the cell by chemical or biological deposits Fouling changes the cell geometry resulting in a shift in cell constant Accordingly the most important determinant of long term sensor accuracy is the cleanliness of the cell We recommend that the conductivity sensors be calibr
58. ill with water after the SBE 25 is submerged Determine the turn on delay by immersing the SBE 25 switch off not running just below the air bleed hole at the top of the Tygon tubing vertical orientation or just below the pump exhaust horizontal orientation Measure the time needed to completely fill the tubing by watching for when air bubbles stop coming of the air bleed valve or pump exhaust 30 seconds is typical Set the delay to approximately 1 5 times longer When actually using the SBE 25 be sure to soak the instrument just under the surface for at least the time required for pump turn on 26 Section 4 Deploying and Operating SBE 25 Real Time Setup Notes e Set the baud rate with SRx e Set the internal data storage rate and real time output rate with CC e Real time output in the table at right is based on the assumption that all voltages are enabled requiring that 40 characters 38 characters plus carriage return and line feed are transmitted for each scan see Data Baud Rate and Cable Length Without a Sea Bird Deck Unit When used without a Sea Bird deck unit the rate that real time data can be transmitted from the SBE 25 is dependent on the rate that data is stored in memory and the serial data baud rate The length of cable that the SBE 25 can drive is also dependent on the baud rate The allowable combinations are Format If you have not enabled all voltages you may be able to provide real time outpu
59. ion 4 Deploying and Operating SBE 25 Acquiring Real Time Data Instructions below are for an SBE 25 with a conventional single core armored cable used without a Sea Bird Deck Unit If using the SBE 25 with the SBE 33 or 36 Deck Unit or the SEACAT SEALOGGER RS 232 and Navigation Interface Box see the Deck Unit or Interface Box manual 1 Wiring Terminate the single core armored cable with an RMG 4FS connector Wire the cable armor to pin 1 large pin and the inner conductor to pin 3 opposite large pin on the SBE 25 s data I O connector Y cable connected to J1 On deck wire Slip ring lead 9 pin serial port from armor Pin 5 from inner conductor Pin 2 2 Double click on Seasave exe 3 Perform any desired setup in the Configure and ScreenDisplay menus 4 Inthe RealTime Data menu select Start Acquisition Ett and Display Real Time Data Set Up Configuration file defines the auxiliary sensors integrated with the instrument and channels serial numbers and calibration dates and coefficients for all the integrated sensors conductivity and temperature as well as auxiliary sensors Verify that con file matches your instrument setup See Verifying Contents of con File Select to save real time data to a file Click to select file location and name Not applicable 5 Click COMM Port Configuration mm Pott Configuration COMM Port and baud rate for
60. ll as the CTD the package creates much more drag than with only the CTD further increasing the possibility that a loop will form in the cable After 1000 to 2000 meters of cable are paid out it can be difficult or impossible to detect a loop in the cable Adding 100 to 200 kg maybe more by experimentation of lead weights to the Carousel frame will help overcome the effect of drag and allow the package to descend faster and stay more in line directly below the overboarding sheave Spiking is sometimes seen in the derived values for salinity density or sound velocity Spiking results largely from a response time mismatch of the conductivity and temperature sensors especially when the profiling descent rate is non uniform Much of the spiking can be removed from the data set by aligning the data in time This alignment can be performed when post processing the data in SBE Data Processing The amount of spiking depends on the temperature gradient and is much worse when coupled surface motion causes the instrument to stop or even reverse its descent In the event of heavy ship motion it may be worth letting the instrument free fall When very heavy seas cause severe ship motion and result in periodic reversals of the instrument descent the data set can be greatly improved by removing scans taken when the pressure is not increasing using SBE Data Processing 41 Section 4 Deploying and Operating SBE 25 Setup for Deployment Insta
61. ll new batteries see Section 5 Routine Maintenance and Calibration or ensure the existing batteries have enough capacity to cover the intended deployment Program the SBE 25 for the intended deployment using SEATERM see Section 3 Power and Communications Test for connection information see information in this section on commands and logging modes A Setthe date and time if not already done B Ensure all data has been uploaded and then send IL to make the entire memory available for recording If IL is not sent data will be stored after the last recorded sample if logging is started with the magnetic switch C Establish the setup and logging parameters If you will be using SEASAVE to acquire and view real time data verify that the configuration con file matches the instrument configuration Sea Bird supplies a con file to match the factory configuration and calibrations If the instrument is recalibrated or the configuration is changed such as by adding external sensors the con file must be updated to reflect the current condition see SEASAVE s Help files If you will be using SEATERM to view real time data click Capture on SEATERM s Toolbar to save the data to a file 42 Section 4 Deploying and Operating SBE 25 Deployment 1 Install a cable or dummy plug for each connector on the Main Housing end cap CAUTION A Lightly lubricate the inside of the dummy plug cable connector with Do not use WD 40 or other
62. load Time amp END of header NMEA Latitude 30 59 70 N NMEA Longitude 081 37 93 W NMEA UTC Time Oct 15 1999 10 57 19 Store Lat Lon Data Append to Every Scan and Append to NAV File When Ctrl F7 is Pressed Ship Sea Bird Cruise Sea Bird Header Test Station Latitude Longitude END OH HF F HF ox ox 5 In the File menu select Save not Save As If you are running Windows 2000 the following message displays You are about to save the document in a Text Only format which will remove all formatting Are you sure you want to do this Ignore the message and click Yes 6 In the File menu select Exit 52 Section 5 Routine Maintenance and Calibration Section 5 Routine Maintenance and Calibration This section reviews corrosion precautions connector mating and maintenance plumbing air valve maintenance battery replacement and recharging conductivity cell storage and cleaning pressure sensor maintenance pump maintenance and sensor calibration The SBE 25 s accuracy is sustained by the care and calibration of the sensors and by establishment of proper handling practices Corrosion Precautions Rinse the SBE 25 with fresh water after use and prior to storage Plastic Main Housing Stainless steel screws connecting the magnetic switch mount to the connector end cap have been generously lubricated with Blue Moly All other stainless steel screws that are exposed to
63. lt in a 0 0004 C maximum error in temperature or a 0 00007 S m maximum error in conductivity At lower sensor frequencies the errors would be smaller These errors are well below those typical of the sensors 0 002 C and 0 0003 S m The sensor accuracies are detailed in their spec sheets which are included in the calibration section of the manual Auxiliary Sensor Voltage Ranges Up to 7 auxiliary voltages with the range 0 to 5 volts DC may by acquired by the SBE 25 The 2 channels at J5 are differentially processed as required when using the Sea Tech Fluorometer and other high current demand instruments Accuracy and Resolution Pressure and Voltage Channels Overall accuracy of the Druck pressure sensor is 0 1 full scale range Pressure resolution is 0 015 full scale range The 5 volt reference used by the A D converter is a Precision Monolithics REF 02EZ with a maximum output voltage temperature coefficient of 8 5 ppm C The 12 bit A D converter is a National Semiconductor ADC1205CCJ 1 with a linearity error of 1 LSB The 12 bit A D converter resolution is 5 4096 or 0 0012 volts per bit Real Time Clock To minimize power and improve clock accuracy a temperature compensated crystal oscillator TCXO is used as the real time clock frequency source The TCXO is accurate to 1 minute per year 0 C to 40 C 64 Appendix I Functional Description and Circuitry Battery Wiring SBE 25 s main battery is a series c
64. make entire memory available for recording if desired C Set date and time and establish setup and logging parameters Send QS to put SBE 25 in quiescent state D Install dummy plugs and or cable connectors and locking sleeves E Remove Tygon tubing that was looped end to end around conductivity cell for storage Reconnect cell to SBE 25 plumbing Put magnetic switch in On position Deploy SBE 25 om Section 1 Introduction Unpacking SBE 25 Shown below is a typical SBE 25 shipment Data I O cable connects computer to Y cable from J1 connector on main housing end cap 25 pin to 9 pin adapter for use with computer with DB 25 connector SBE 25 SEALOGGER in cage shown with optional auxiliary sensors Conductivity cell Conductivity cell filling gt i Pressure sensor cleaning solution and storage kit oil refill kit Triton X Spare battery end cap Jackscrew Kit hardware and o ring kit SBE25 SEALOGGER 375M 1677 0137 0140 v2 Software and Electronic Copies of Software Manuals and User Manual SBE 25 Manual 6 Section 2 Description of SBE 25 Section 2 Description of SBE 25 This section describes the functions and features of the SBE 25 including specifications dimensions end cap connectors magnetic reed switch data I O batteries and battery endurance memory endurance and plumbing System Description Y cable main A St We housing to in
65. mands and alternate methods for starting and stopping logging A magnetic switch mounted on the main housing is used to start and stop logging With the SBE 25 in quiescent sleep state sliding the switch to the On position wakes up the SBE 25 and starts logging Sliding the switch to the Off position stops logging The switch should be Off away from the connector end cap when the SBE 25 is not logging data i e during setup diagnostics and data extraction Data I O The SBE 25 receives set up instructions and outputs diagnostic information or previously recorded data via a three wire RS 232C link and is factory configured for 600 baud 7 data bits 1 stop bit and even parity SBE 25 RS 232 levels are directly compatible with standard serial interface cards IBM Asynchronous Communications Adapter or equal The communications baud rate can be changed using SRx see Section 4 Deploying and Operating SBE 25 Batteries For the main battery the SBE 25 uses nine D cell alkaline batteries or rechargeable Nickel Cadmium Ni Cad batteries If necessary carbon zinc or mercury cells can also be used On board lithium batteries non hazardous units that are unrestricted for shipping purposes are provided to back up the buffer and the real time clock in the event of main battery failure or exhaustion The main batteries may be replaced without affecting either the real time clock or memory Battery Endurance Note
66. mp Opetati n 535i nibo ee Tenn eee erra oed 26 Real Time Setup etre E D Pip 27 Baud Rate and Cable Length essseeeeeeeeeeene 27 Real Time Data Acquisition essere 27 Timeout Descrpltion o timed ment eet eos 28 Command Descriptions eret ED eret ep pco d eres 28 Data CONUS 39 Optimizing Data Quality siasii eieiei i sE e nennen enne 40 Setup for Deployinent 2 dere et dere EEE ENA EEE EER ET 42 Deployment EIER ere aeri eae 43 Acquiring Real Time Data with SEASAVE esee 44 Verifying Contents of con File sees 44 Acquiring Real Time Data essent 45 Multiple Deployment eese nete nennen nennen nennen enne 46 Uc ES 47 Physical Handling esses eere enne 47 Uploading D ta nne eerte tee steal 47 Processing Data iss aee t ER rebelde ie er E IATER 51 Editing Raw Data Ele eet d ree end 52 Table of Contents Section 5 Routine Maintenance and Calibration 53 Corrosion Precautions sese nennen enne tnter nennen 53 Connector Mating and Maintenance eene 54 Plumbing Maintenance Lue d quise edd indeed 54 Battery Replacement Recharging eese 55 Replacing Alkaline Batteries eeeeeeeeeen 55 Recharging Nickel Cadmium Batteries esee 56 Conductivity Cell M
67. municating with SBE 25 put switch in On position S gt RL Start logging Y N y Are you sure Y N y symbol indicates Ctrl key Hold down Ctrl key while typing y or n hex data displays on SEATERM screen after a few seconds SB Put SBE 25 in Standby Mode SBE 25 requires verification before it proceeds After SB is verified wait at least 3 seconds and then put magnetic switch in On position to start logging Put magnetic switch in Off position to stop logging logging stops but power is not removed from sensors or pump Send Ctrl Z or click Stop on SEATERM s Toolbar to take SBE 25 out of Standby Mode Failure to exit Standby mode results in exhaustion of main battery supply Example user input in bold S gt SB Start standby mode Y N y Are you sure Y N y symbolindicates Ctrl key Hold down Ctrl key while typing y or n S wait 3 seconds then put switch in On position to start logging hex data displays on SEATERM screen after a few seconds 36 Section 4 Deploying and Operating SBE 25 Data Upload Commands Stop logging before uploading data Notes e Use the Upload button on DCx Upload data from cast x at 600 baud If x SEATERM s Toolbar or Upload is omitted data from cast 0 is uploaded Data in the Data menu to upload data that will be processed by Sea Bird software Manually entering a data upload command does not produce data with the required header information
68. n AG 306 HP SS as applicable for connection to the computer for setup and i optional MCBH wet pluggable connectors uploading of data 2 pin MCBH 2 3 pin MCBH 3 or 6 pin MCBH 6 and applicable Note Wet pluggable connector material must match SBE 25 end cap anodized aluminum DR NE eG e e e H 5 e 1 H 5 e e e e e Pin oe Data I O Pump and External Power 9 Pin Signal 1 Power Common 2 Auxiliary Power Out H pelas Receive f ut 3 Pressure Signal Common ij SCOIVE TOIT comparer 3 RS 232C Transmit to computer 4 Pressure Signal A 4 Pump Power Common 5 Pressure Temperature Signal 6 Auxiliary Power Out 9 Pump Power 6 External Power In 14 16 VDC Sanset Temperature Pin Signal 1 Common 2 Temperature frequency 3 Auxiliary Power Out deri 9 Conductivity e 2 Differential Input Voltage 4 5 Pin Signal 1 Pin Signal 1 Common v5 e i Common 2 Conductivity frequency o e Voltage 4 Signal 3 Auxiliary Power Out O41 Voltage 4 Common Single Ended Input Voltage 0 3 i Pii Gs Pin Signal Auxiliary Power Out Common Voltage O Signal Voltage 3 Signal Voltage 1 Signal Voltage 2 Signal Auxiliary Power Out PAR Voltage 6 Pin Signal 1 Common 2 PAR Signal Voltage 6 Signal OORUN OuahWN Section 2 Description of SBE 25 Magnetic Reed Switch Magnetic switch Connector end cap Note See Section 4 Deploying and Operating SBE 25 for details on com
69. ng with air For an SBE 25 deployed in a vertical orientation release valve Periodically clean the air release valve with a fine wire A clogged air release valve can trap air preventing the pump from functioning properly this will affect the data quality Air release valve detail 0 5 mm 0 02 in 54 Section 5 Routine Maintenance and Calibration Battery Replacement Recharging Note If changing from alkaline to Ni Cad batteries or vice versa send CC to indicate the new battery type Alkaline D cell MN1300 LR20 Mie a Unthread cap by rotating counter clockwise Remove Phillips head Screws and washers Leave the batteries in place when storing the SBE 25 to prevent depletion of the back up lithium batteries by the real time clock Even exhausted main batteries will power the clock 150 microamperes almost indefinitely If the SBE 25 is to be stored for long periods leave the batteries in place and replace them yearly Replacing Alkaline Batteries The SBE 25 uses alkaline D cells Duracell MN1300 LR20 dropped into the battery compartment 1 Remove the main housing battery end cap end cap without connectors A Wipe the outside of the end cap and housing dry being careful to remove any water at the seam between them B Unthread the end cap by rotating counter clockwise use a wrench on the white plastic bar if necessary C Remove any water from the O ring mating
70. nnector e 171724 3 pin MCBH 3MAS bulkhead connector e 171725 4 pin MCBH 4MAS bulkhead connector e 30044 Seacat anode 1 e 30384 Tygon tubing 7 16 x 9 16 conductivity soaker hose e 30388 Tygon tubing 34 x 2 main CTD plumbing e 30409 Teflon tape adhesive 1 side insulation for metal parts to hose clamps e 30411 Triton X 100 conductivity cell SEALOGGER CTD cleaning solution 50331 SUPPort Kit SBE25 30457 parker Super O Lube with wet pluggable silicone based o ring lubricant connectors e 41124 Seacat battery cover plate battery retainer plate e 50025 Pressure sensor oil refill kit e 50026 Magnetic switch assembly e 50029 Pressure sensor capillary assembly e 50069 SBE 25 small hardware amp o ring kit see above e 171669 3 pin MCIL 3FS to 3 pin MCIL 3FS cable 0 7 m 2 5 ft long temperature amp conductivity sensor cables e 171798 6 pin MCIL 6FS to 6 pin MCIL 6FS cable 1 0 m 3 3 ft long pressure sensor cable e 801374 4 pin MCIL 4FS to 9 pin DB 9S 2 4 m 8 ft data I O cable for bench use from SBE 25 J1 Y cable 171883 to computer e 801421 4 pin MCIL 4FS to 9 pin DB 9S I O cable 20 m 66 ft long for real time logging from SBE 25 J1 Y cable 171883 to computer e 171883 6 pin MCIL 4MP to 2 pin MCIL 2FS and 4 pin MCIL 4MP Pump Data I O Y cable from SBE 25 J1 to pump 2 pin and data I O 4 pin 72 Index con file 51 A About Sea Bi
71. ny cases it is permissible to have the CTD power and or signal common lines connected to the auxiliary equipment housing However do not connect the auxiliary equipment housing to the SBE 25 s 10 5 volt power source as this can damage the platinized surfaces of the conductivity cell electrodes 53 Section 5 Routine Maintenance and Calibration Connector Mating and Maintenance Mated connectors do not require periodic disassembly or other attention Inspect connectors that are unmated for signs of corrosion product around the pins When remating 1 Lightly lubricate the inside of the dummy plug cable connector with silicone grease DC 4 or equivalent 2 Standard Connector Install the plug cable connector aligning the raised bump on the side of the plug cable connector with the large pin pin 1 ground on the SBE 25 Remove any trapped air by burping or gently squeezing the plug connector near the top and moving your fingers toward the end cap OR MCBH Connector Install the plug cable connector aligning the pins 3 Place the locking sleeve over the plug cable connector Tighten the locking sleeve finger tight only Do not overtighten the locking sleeve and do not use a wrench or pliers CAUTION Do not use WD 40 or other petroleum based lubricants as they will damage the connector Verify that a cable or dummy plug is installed for each connector on the system before deployment Plumbing Maintenance Y fitti
72. om the conductivity cell directly to the Y fitting e Main plumbing is 13 mm ID x 19 mm OD 1 2 inch x 3 4 inch Tygon tubing Air release valve detail e A 13 mm 0 5 inch long piece of 0 5 mm 0 02 in 9 5 mm ID x 18 mm OD 3 8 inch x 1 2 inch Tygon tubing to fit to the main plumbing is installed on the SBE 43 intake and exhaust Approximately 100 mm 4 inch length of Tygon tubing _ Y fitting and air release valve Secure each tubing connection with 2 cable ties not shown Josues OG r 38S Tygon Note Periodically clean air tubing release valve to ensure typical proper functioning DO sensor intake Pump intake Quick release coupling Josues E Eq TC Duct Place intake and exhaust far enough away from each other to avoid recirculation of water DO sensor intake and exhaust detail 13 mm inner diameter diameter Tygon tubing Tygon tubing 13 mm long 16 Section 2 Description of SBE 25 Horizontal Mount Place the DO sensor intake above the conductivity sensor exhaust Place the pump intake above the DO sensor exhaust Orient the pump with the exhaust outlet corner up Place a 13 mm 0 5 inch piece of the 9 5 mm ID Tygon tubing at the DO sensor intake and exhaust Slide the larger diameter tubing 13 mm ID over the smaller diameter tubing to provide tight seals e Ifthe system does not include a DO sensor connect the tubing from the conductivity cell direc
73. on 1 An uploaded data file with nonsense values may be caused by an incorrect firmware version or data upload baud rate in SEATERM s Configuration Options dialog box Verify the correct firmware version with DS firmware version is on the first line of the SBE 25 response Cause Solution 2 An uploaded data file with nonsense values may be caused by incorrect instrument configuration in the con file or incorrect assignment of voltage channels with CC Verify that the settings in the instrument con file match the instrument Configuration Sheet and that the assignment of external voltages to stored voltages check using DS also matches the instrument Configuration Sheet Cause Solution 3 An uploaded data file with unreasonable i e out of the expected range values for a sensor may be caused by incorrect calibration coefficients in the instrument con file Verify that the calibration coefficients in the instrument con file match the instrument Calibration Certificates 61 Glossar Glossary Batteries Nine alkaline D cells Duracell MN1300 LR20 standard Available with optional rechargeable Ni Cad battery pack Fouling Biological growth in the conductivity cell during deployment PCB Printed Circuit Board SBE Data Processing Sea Bird s Win 95 98 NT 2000 XP data processing software which calculates temperature conductivity and pressure and derives variables such as salinity and sound velocity Scan On
74. onnection of D cells that drop into the battery compartment as a cluster of end to end stacks three batteries each standard 9 cell battery pack has three stacks The positive battery connections are contact areas on double thick printed circuit disks that form the internal bulkhead and battery retainer plates Battery negative contacts are heavy beryllium copper springs The three cell stacks are aligned by plastic insulated aluminum spacers which also serve as electrical interconnects The battery to circuit card connection is made by means of a Molex type 3 pin pc board connector JP3 on the power PCB The Power PCB contains two series connected Panasonic BR 2 3A lithium cells non hazardous which are diode OR d with the main battery and external power source if used The lithium supply is capable of supporting all SBE 25 functions and serves to permit orderly shutdown in the event of failed or exhausted main batteries The main batteries can be changed without disturbing memory or the real time clock If the back up lithium battery voltage vlith in the DS response falls below 4 5 volts replace the back up batteries 65 Appendix Il Electronics Disassembly Reassembl Appendix II Electronics Disassembly Reassembly Note Disassembling the electronics erases the SBE 25 memory all logged data in memory is lost and all user programmable parameters date and time sampling scheme etc are reset to default values Di
75. or or a Sea Tech fluorometer Standby Mode provides a way to leave power on to all the sensors and the pump when you stop logging Logging is started by e Sending SB waiting at least 3 seconds and then putting the magnetic switch in the On position Power is applied as follows e Temperature conductivity and pressure sensors and sensors connected to the single ended input connector J4 and PAR connector J6 Power is applied when the switch is put in the On position e Pump Power is applied pump delay seconds after the minimum conductivity frequency is reached see Pump Operation Both the pump delay and the minimum conductivity frequency are user programmable with CC e Sensors connected to the differential input connector J5 Power is applied 5 seconds after power is applied to the pump to reduce the surge current required from the batteries at pump turn on After power is applied to the differential input connector the first data point is stored in memory and the cast header date and time is written Logging is stopped by e Putting the magnetic switch in the Off position stops logging but does not remove power from any sensors or the pump OR e Clicking Stop on SEATERM s Toolbar or typing Ctrl Z stops logging removes power from the pump and the sensors connected to the differential input connector but does not put remove power from the other sensors This also causes the SBE 25 to exit Standby Mode
76. or to add explanatory notes about the cast Editing the raw hex file can corrupt the data making it impossible to perform further processing using Sea Bird software Sea Bird strongly recommends that you first convert the data to a cnv file using Data Conversion in SBE Data Processing and then use other SBE Data Processing modules to edit the cnv file as desired The procedure for editing a hex data file described below has been found to work correctly on computers running Windows 98 2000 and NT If the editing is not performed using this technique SBE Data Processing may reject the edited data file and give you an error message 1 Make a back up copy of your hex data file before you begin 2 Run WordPad 3 Inthe File menu select Open The Open dialog box appears For Files of type select All Documents Browse to the desired hex data file and click Open 4 Edit the file as desired inserting any new header lines after the System Upload Time line Note that all header lines must begin with an asterisk and END indicates the end of the header An example is shown below for an SBE 21 with the added lines in bold Sea Bird SBE 21 Data File FileName C Odis SAT2 ODIS oct14 19 o0c15_99 hex Software Version Seasave Win32 v1 10 Temperature SN 2366 Conductivity SN 2366 System UpLoad Time Oct 15 1999 10 57 19 Testing adding header lines Must start with an asterisk Place anywhere between System Up
77. plete setup review the configuration setting for your instrument by selecting your instrument type from the Configure menu list Instrument Type BA COM Port Select the instrument type SBE 25 and the computer COM port for communication with the SBE 25 Click OK 2 The main screen looks like this EM SeaTerm Version 1 26 SeaTerm By File Configure Communications Utilities Data View Help Command Data Echo Area Capture Status bar to file status grayed out if not capturing Note There is at least one way and as many as three ways to enter a command e Manually type a command in Command Data Echo Area e Use a menu to automatically generate a command e Use a Toolbar button to automatically generate a command Upload parameter ve comi eze Ceptuing ses Instrument Baud rate data bits EPROM version stop bits and parity Menus Contains tasks and frequently executed instrument commands e Toolbar Contains buttons for frequently executed tasks and instrument commands All tasks and commands accessed through the Toolbar are also available in the Menus To display or hide the Note Toolbar select View Toolbar in the View menu Grayed out Toolbar Once the system is configured and buttons are not applicable connected Steps 3 through 5 e Command Data Echo Area Echoes a command executed using a below to update the Status bar Menu or Toolbar button
78. profile very near the top of the water The cell inlet and pump outlet must not come above the water surface or the prime will be lost e f prime is lost put the magnetic switch in the Off position Wait at least 3 seconds then put the switch in the On position submerge the SBE 25 completely and wait for the pump delay time before beginning the profile Pump turn on occurs when two user programmable conditions have been met e Raw conductivity frequency exceeds the minimum conductivity frequency CC Set the minimum conductivity frequency for pump turn on above the instrument s zero conductivity raw frequency shown on the SBE 25 Configuration Sheet to prevent the pump from turning on when the SBE 25 is in air Forsalt water and estuarine applications typical value zero conductivity raw frequency 500 Hz gt For fresh nearly fresh water typical value zero conductivity raw frequency 5 Hz If the minimum conductivity frequency is too close to the zero conductivity raw frequency the pump may turn on when the SBE 25 is in air as result of small drifts in the electronics Some experimentation may be required and in some cases it may be necessary to rely only on the pump turn on delay time to control the pump If so set a minimum conductivity frequency lower than the zero conductivity raw frequency e Pump turn on delay time has elapsed CC Set the pump turn on delay time to allow time for the Tygon tubing and pump to f
79. r condition unknown error condition Example user input in bold Upload header for cast O to a file Click Capture on Toolbar and enter desired filename in dialog box S gt DHO cast 0 11 05 12 30 33 samples 0 to 87 nv 3 avg 4 stop switch off 37 Section 4 Deploying and Operating SBE 25 Diagnostic Commands TM Perform memory test which destroys all logged data in SBE 25 memory SBE 25 requires verification before proceeding A pattern is written into all locations of each RAM Data in RAM is then compared to pattern TE Perform extended memory test which destroys all logged data in SBE 25 memory SBE 25 requires verification before proceeding Same as TM test but 10 passes are performed with pattern incremented by 1 for each pass Example user input in bold S te Extended memory test Y N y Are you sure Y N y symbolindicates Ctrl key Hold down Ctrl key while typing y or n Pass 1 Ram 0 OK Ram 31 OK repeats entire sequence for passes 2 through 10 At conclusion of test or when Esc is received SBE 25 displays Ram test passed with no errors FR Measure and display temperature t and conductivity c frequencies Hz SBE 25 runs continuously during test drawing current Press Esc key or click Stop on SEATERM s Toolbar to stop test Example user input in bold S gt fr t 4719 009 c 2752 085 t 4719 76 c 2752 093 VR M
80. rd 5 B Batteries 11 14 42 alkaline 55 Ni Cad 56 recharging 56 replacing 55 Battery endurance 14 Baud 14 Baud rate 21 27 30 37 45 47 C Cable length 27 Calibration 11 58 Circuitry 63 Cleaning 54 57 Clock 11 Command summary 68 Commands data upload 37 descriptions 28 diagnostic 38 logging 35 setup 30 status 29 Communication defaults 21 Configuration file 51 Connectors 13 54 Corrosion precautions 53 D Data bits 14 Data format 39 Data I O 14 Data processing 51 Data storage 11 15 Deployment fresh water 26 installation 43 multiple 46 optimizing data quality 40 saltwater 26 setup 42 Description 7 Dimensions 12 E Editing data files 52 Electronics disassembly reassembly 66 End cap 13 54 55 66 Index 73 F Format data output 39 Fresh water deployment 26 Functional description 63 G Glossary 62 L Logging 23 35 Logging mode normal 24 36 standby 25 36 M Magnetic reed switch 14 24 25 35 Maintenance 53 Memory 11 15 N Normal mode 24 36 P Parity 14 Parts replacement 69 Plumbing 15 54 Power 11 14 Power endurance 14 Pressure sensor maintenance 57 Processing data 51 Pump maintenance 57 Pump operation 26 Q Quick Start 5 R Real time data acquisition 44 Real time setup baud rate 27 cable length 27 Recovery
81. rdware including e 30145 Screw 6 32 x 1 2 Phillips head stainless steel secures alkaline battery cover plate to battery posts secures Ni Cad battery pack to battery posts Spare battery end ca 60021 Sinis d faic e 30242 Washer 6 flat stainless steel z for 30145 e 30816 Parker 2 234E603 70 battery end cap to housing piston seal e 30090 Parker 2 153N674 70 battery end cap to housing face seal Continued on next page 69 Appendix IV Replacement Parts Continued from previous page Part Paar ENT Quantity Nuniber Part Application Description in 25 O rings and hardware including e 50087 TC Duct cell filling amp storage kit e 30145 Screw 6 32 x 1 Phillips head stainless steel secures alkaline battery cover plate to battery posts secures Ni Cad battery pack to battery posts e 30242 Washer 6 flat stainless steel for 30145 e 30424 Screw 10 24 x 2 PH SS connector end cap hardware for plastic housing e 30237 Washer 10 Nylon for 30424 e 30425 Screw 8 32 x 2 PH SS connector end cap hardware for aluminum housing e 30267 Screw insulator 8 x 2 for 30425 Spare hardware and e 30377 Bolt 4 20 x 1 1 4 socket SS 50069 o ring kit secures mount blocks to cage e 30254 Washer 4 split ring lock for 30377 e 30816 Parker 2 234E603 70 battery end cap to housing piston seal e 30090 Parker 2 153N674 70 battery end cap to housing face seal e 30815 Parker 2 233N674
82. rom status Verifying Contents of con File SEASAVE our real time data acquisition and display program requires a con file which defines the instrument auxiliary sensors integrated with the instrument and channels serial numbers and calibration dates and coefficients for all integrated sensors conductivity temperature and pressure as well as auxiliary sensors SEASAVE as well as our data processing software uses the information in the con file to interpret and process the raw data If the con file does not match the actual instrument configuration the software will not be able to interpret and process the data correctly 1 Double click on Seasave exe 2 In SEASAVE s Configure menu select New Style Instrument Configuration Select Instrument Configuration In the dialog box select the appropriate con file and click Open 3 Inthe Configure menu select New Style Instrument Configuration Modify Selected Instrument Configuration The configuration dialog box appears Verify that the sensors match those on your SBE 25 and that auxiliary sensors are assigned to the correct voltage channels Verify that the calibration coefficients for all the sensors are up to date Channel Sensor table reflects this choice 0 7 Must agree with DS Voltage channel 0 in con file corresponds to first external voltage in data stream voltage channel 1 to second external ASCII file opened None l voltage in data stream etc
83. rovide any data until differential input power is applied When processing data after the cast you can eliminate these initial scans in memory by setting up the post processing software to skip the scans see SBE Data Processing s manual Help files Logging is stopped by e Putting the magnetic switch in the Off position stops logging and puts SBE 25 into quiescent sleep state removing power from all equipment OR e Clicking Stop on SEATERM s Toolbar or typing Ctrl Z stops logging removes power from the pump and the sensors connected to the differential input connector but does not put remove power from the other sensors Note that the SBE 25 automatically enters quiescent sleep state removing power from the remaining sensors after 2 minutes without receiving a command 24 Section 4 Deploying and Operating SBE 25 Note The SBE 25 will not respond to any commands after receiving SB which places it in Standby Mode You must remove it from Standby Mode by typing Ctrl Z or clicking Stop on SEATERWM s Toolbar before it will respond to commands Standby Mode Standby Mode is designed for work where there are repetitive short casts In Normal Mode power to the sensors is turned off at the end of each cast This may not be desired when casts are made in rapid succession if your system includes sensors that require a long warm up before providing accurate data for example a Beckman or YSI type oxygen sens
84. rs and Sensor Interface The SBE 4 conductivity sensor contains a 3 electrode 2 terminal borosilicate glass cell The SBE 3 temperature sensor has a pressure protected thermistor The conductivity and temperature sensors produce variable frequency outputs To obtain the high encoding speed and resolution required by profiling applications a hybrid period counting technique is used Two 12 bit counters are used one counter accumulates the integral number of sensor counts during the sample interval 1 36 second and the other counter measures the time from the beginning of the measurement period until the first positive going zero crossing of the sensor frequency i e determines the fractional count The SBE 29 pressure sensor contains a Druck strain gauge sensor and is powered with a 5 volt reference The resulting output voltage is amplified and then digitized with a 12 bit A D converter using the same 5 volt reference Sensor Frequency Ranges Each counter can handle 4096 counts The maximum time that the N counter is gated on is 1 F Since the N counter runs at 9 437 184 Hz the minimum allowable F is given by 9 437 184 4096 or 2304 Hz The maximum allowable sensor frequency is determined by the size of the N counter no more than 4096 counts may be accumulated during the measurement interval Thus maximum F 4096 1 36 147 456 Hz Resolution CT Channels Resolution Hz bit 36 F F where F sensor frequen
85. rt the hex raw data file real time file from SEASAVE or See the SBE Data Processing uploaded from SBE 25 memory to a cnv engineering units file in manual and or Help files SBE Data Processing s Data Conversion module 2 Once the data is converted perform further processing align filter remove bad data etc calculate derived variables and plot data using SBE Data Processing s other modules Verifying Contents of Configuration con File To convert the hex raw data file you need a con file which defines the instrument integrated sensors and channels serial numbers and calibration dates and coefficients for all sensors conductivity temperature and pressure as well as auxiliary sensors SBE Data Processing uses the con file information to interpret and process the raw data If the con file does not match the actual instrument configuration the software will be unable to interpret and process the data correctly To view or modify the con file 1 Double click on SBEDataProc exe 2 Inthe Configure menu select SBE 25 Sealogger CTD The configuration dialog box appears In the configuration dialog box click Open 3 In the Open dialog box select the appropriate con file and click Open Verify that the sensors match those on your SBE 25 and that auxiliary sensors are assigned to the correct voltage channels Verify that calibration coefficients for all sensors are up to date Channel Sensor table r
86. ry Apply a light coat of O ring lubricant Parker Super O Lube to O ring and mating surfaces Reconnect the Molex connector to the PCB assembly Verify the connector holds and pins are properly aligned Carefully fit the PCB assembly into the housing aligning the holes in the end cap and housing Reinstall the 4 Phillips head screws and washers to secure the end cap to the housing Reinstall the 3 plastic hex head screws in the end cap Reinstall the 2 Phillips head screws to secure the magnetic switch bracket to the side of the housing Establish communications with the SBE 25 see Section 4 Deploying and Operating SBE 25 Initialize RAM IR reset the date and time ST and re enter all the setup parameters 67 A endix Ill Command Summar Appendix Ill Command Summary CATEGORY COMMAND DESCRIPTION Status DS Display status and setup parameters ST Set real time clock date and time SRx x baud rate indicator 12600 221200 329600 424800 Default 600 Configure a number of parameters e Internal data storage rate e Real time data output rate e Pressure sensor range e Pressure temperature compensation value CC on ae e Minimum conductivity frequency for pump turn on Setup e Pump turn on delay e Stop CTD on upcast e Battery type e Number of external voltages to sample x wait interval milliseconds after each line of data LWx Norm
87. s e See Specifications for power requirements e See Data Storage and Specifications for data storage limitations The standard 9 cell alkaline battery pack has a nominal capacity of 14 amp hours for planning purposes Sea Bird recommends using a conservative value of 10 5 amp hours The optional Ni Cad battery pack has a nominal capacity of 4 4 amp hours Current consumption varies depending on inclusion of auxiliary sensors Examples are shown below for two sampling schemes Example 1 standard alkaline batteries no auxiliary sensors Sampling current T C and P 190 mA 20 19 A Pump current 150 mA 0 15 A Maximum sampling time 10 5 amp hours 0 19 Amps 0 15 Amps 30 hours Example 2 standard alkaline batteries auxiliary sensors drawing 100 mA Sampling current T C and P 190 mA 20 19 A Pump current 150 mA 0 15 A Auxiliary sensor current 100 mA 0 10 A Maximum sampling time 10 5 amp hours 0 19 Amps 0 15 Amps 0 10 Amps 23 hours 14 Section 2 Description of SBE 25 Data Storage Note The SBE 25 has a 1024 KB standard memory 8 MB optional Shown below See Specifications for are calculations of available data storage for several configurations data storage required for each parameter Example 1 1024 KB standard memory no auxiliary sensors T C and P 8 bytes sample Storage space 1 024 000 8 128 000 samples Example 2 1024 KB standard memory
88. s x of full scale range FSR less than maximum value of pressure reached during downcast Set this value greater than expected peak to peak ship heave to avoid stopping logging before upcast actually begins Stopping on upcast is enabled only after cast has reached a pressure of at least 20 of FSR to prevent SBE 25 from stopping while you are positioning it in water to begin cast Surface Stop on upcast enabled after SBE 25 at least this deep Stop logging when pressure decreases this much from maximum pressure X 96 of full scale range ME TIME x Bottom of cast Note before continuing If the battery voltage is below the battery cut off voltage the following displays in response to DS WARNING LOW BATTERY VOLTAGE Replace the batteries 32 maximum pressure battery type NICAD or ALKALINE enter A or N Z new value A for Alkaline N for Ni Cad If Alkaline logging halts when battery drops below 7 5 volts for five consecutive scans This reduces battery load to quiescent current 150 microamps If Ni Cad logging halts when battery drops below 7 5 volts for five consecutive scans or when battery voltage is less than 10 2 volts and voltage drop is greater than 1 volt minute as determined by two 30 second moving averages This reduces battery load to quiescent current 150 microamps once first cell in battery pack is exhausted Section 4 Deploying and Operating SBE 25
89. salt water have been generously lubricated with DC 4 After each cruise remove all these screws and re lubricate These compounds are electrically conductive use care to ensure they do not get on PCBs The SBE 25 has a large zinc anode screwed into the magnetic switch mount Check the anode periodically to verify that it is securely fastened and has not been eaten away Avoid direct attachment of metal objects to the aluminum end cap Aluminum Main Housing All stainless steel screws that are exposed to salt water have been generously lubricated with Blue Moly After each cruise remove these screws and re lubricate This compound is electrically conductive use care to ensure it does not get on PCBs The SBE 25 has a large zinc anode screwed into the battery end cap and the magnetic switch mount Check the anodes periodically to verify that they are securely fastened and have not been eaten away The housing is insulated from the stainless steel guard cage and sea cable power circuits preventing heavy corrosion of the housing Avoid direct attachment of metal objects to the housing Modular Sensors and Auxiliary Equipment The modular temperature conductivity and pressure sensors have ring shaped zinc anodes Check the anodes periodically to verify that they are securely fastened and have not been eaten away Auxiliary equipment powered from the SBE 25 should ideally have a floating housing relative to their power circuits In ma
90. sassembly Sea Bird provides a jackscrew kit with the SBE 25 to assist in removal of the main housing connector end cap The kit contains e 2 Allen wrenches e 3jackscrews e 2 spare plastic socket hex head screws Jackscrew kit CAUTION Remove the connector end cap and attached electronics PCB assembly Disconnect sensors from the connector as follows end cap before disassembly to avoid breaking sensors 1 Establish communications with the SBE 25 see Section 4 Deploying and Operating SBE 25 Upload any data in memory before beginning 2 Wipe the outside of the end cap and housing dry being careful to remove any water at the seam between them 3 Remove the 2 stainless steel Phillips head screws securing the magnetic switch bracket to the side of the housing Do not remove the 2 screws Leave in place Remove screw securing the bracket to the end cap you will be sliding the bracket off Screw connecting connecting bracket bracket to end to housing with the end cap cap typical typical 2 places 2 places 4 Remove the end cap with attached magnetic switch bracket and electronics Remove Phillips head Screw and washer typical 4 places A Remove the 4 stainless steel Phillips head screws and washers securing the connector end cap to the housing B Remove the 3 plastic hex head screws from the end cap using the larger Allen wrench Insert the three jackscrews in these three holes in the end cap
91. ser input header C Include default header form in the upload file information not included in upload file Note When you click OK SEATERM saves the Configuration Options settings to the SeaTerm ini file in your Windows directory SeaTerm ini contains the last saved settings for each instrument When you open SEATERM and select the desired instrument SBE 19 25 etc in the Configure menu the Configuration Options dialog box shows the last saved settings for that instrument Cancel Default Help DK ums LIN Select the desired header information option Click OK to save all the settings in the Configuration Options dialog box 4 In the Configure menu select Header Form to customize the user input header The dialog box looks like this default prompts are shown m Edit Header Prompts mI x Prompttor line 1 hp 7 0 Prompt far line 2 mise SS Promptiorline3 Son Promptiorline4 Laud Prompt for line 5 longitude Prompt for line 6 Prormpttor line Z Pemp olineg Pmporineg Promptiorine 1 Prompttor line 11 Do Promptforline 12 770 Cancel OK The entries are free form 0 to 12 lines long This dialog box establishes e header prompts that appear for the user to fill in when uploading data if Prompt for header information was selected in the Configuration Options dialog box Step 3 e user input header included with the uploade
92. solved oxygen pH fluorescence light PAR light transmission and turbidity e Nickel Cadmium Ni Cad batteries and charger The SBE 25 can be used with the following Sea Bird equipment e SBE 32 Carousel Water Sampler and SBE 33 Carousel Deck Unit The SBE 32 provides 15 VDC power to the SBE 25 and has ample power available for auxiliary sensors not normally supported by battery powered CTDs The CTD data from the SBE 25 is converted into single wire telemetry for transmission over long up to 10 000 meter 32 800 feet sea cables Bottles may be closed at any depth without interrupting CTD data via software control using the SEASAVE program or from the front panel of the SBE 33 Deck Unit See the SBE 33 manual for system operating details SBE 33 Carousel Deck Unit SBE 32 Carousel SBE 19 19plus or 25 Section 2 Description of SBE 25 e SBE 36 CTD Deck Unit and Power Data Interface Module PDIM These items provide power and real time data handling capabilities over single conductor sea cables using the same method as employed in the SBE 32 SBE 33 Carousel Water Sampler The PDIM is a small pressure housing that is mounted on or near the SBE 25 It provides 15 VDC power to the SBE 25 and interfaces two way RS 232 communications from the SBE 25 to the telemetry used on the sea cable See the SBE 36 PDIM manual for system operating details optional NMEA 0183 interface GPS Serial data SBE 36 C
93. some residual effect allowing the SBE 25 to equilibrate before starting will provide the most accurate calibration correction Note The SBE 29 pressure sensor is an absolute sensor so its raw output 1 Place the SBE 25 in the orientation it will have when deployed includes the effect of atmospheric pressure 14 7 psi As shown on the 2 In SEASAVE in the con file set the pressure offset to 0 0 Calibration Sheet Sea Bird s calibration and resulting calibration 3 Acquire data and display the SBE 25 pressure sensor output in decibars coefficients is in terms of psia However when outputting pressure in engineering units SEASAVE outputs pressure relative to the ocean surface 4 Compare the SBE 25 output to the reading from a good barometer at the same elevation as the SBE 25 s pressure sensor i e at the surface the output pressure Calculate offset barometer reading SBE 25 reading is 0 decibars SEASAVE uses the following equation to convert psia to 5 Enter calculated offset positive or negative in the con file decibars Pressure db pressure psia 14 7 0 689476 Absolute pressure measured by a barometer is 1010 50 mbar Pressure displayed from SBE 25 is 2 5 dbars Convert barometer reading to dbars using the relationship mbar 0 01 dbar Barometer reading 1010 50 mbar 0 01 10 1050 dbar SEASAVE outputs gage pressure using an assumed value of 14 7 psi for atmospheric pressure
94. surfaces inside the housing with a lint free cloth or tissue D Putthe end cap aside being careful to protect the O ring from damage or contamination 2 Remove the battery cover plate from the housing A Remove the three Phillips head screws and washers from the battery cover plate inside the housing B The battery cover plate will pop out Put it aside 3 Turn the SBE 25 over and remove the batteries 4 Install the new batteries with the terminals against the flat battery contacts and the terminals against the spring contacts 5 Reinstall the battery cover plate in the housing A Align the battery cover plate with the housing The posts inside the housing are not placed symmetrically so the cover plate fits into the housing only one way Looking at the cover plate note that one screw hole is closer to the edge than the others corresponding to the post that is closest to the housing B Reinstall the three Phillips head screws and washers while pushing hard on the battery cover plate to depress the spring contacts at the bottom of the battery compartment The screws must be fully tightened or battery power to the circuitry will be intermittent 6 Check the battery voltage at BAT and BAT on the battery cover plate It should be approximately 13 5 volts 7 Reinstall the battery end cap A Remove any water from the O rings and mating surfaces with a lint free cloth or tissue Inspect the O rings and mating surfa
95. t at a faster rate Calculate maximum real time output rate seconds of characters 10 bits character baud Maximum Baud Data Storage Real Time Cable Length Rate in Memory Output meters scans second scans second 1600 600 8 4 2 or 1 1 800 1200 8 nd 2 1 H 2 8 1 2 4 or 8 4 1 2 or 4 200 4800 7 rae 1 1 8 1 2 4 or 8 4 1 2 0r4 100 9600 7 lor2 1 1 With a Sea Bird Deck Unit Set the SBE 25 s baud rate to 4800 if using the SBE 25 with either of the following real time data acquisition systems e SBE 36 CTD Deck Unit and Power and Data Interface Module PDIM e SBE 33 Carousel Deck Unit and SBE 32 Carousel Water Sampler The data telemetry link can drive 10 000 meters of cable while accepting 4800 baud serial data The relationship between real time output and data storage in memory is as shown in the table above for the 4800 baud rate Real Time Data Acquisition Real time data can be acquired in either of the following ways e With SEASAVE typical method Data can be viewed in SEASAVE in tabular form or as plots as raw data or as converted engineering units data Data acquired with SEASAVE can be processed with SBE Data Processing See SEASAVE s manual Help files for setting up the program displays baud rates etc and beginning data acquisition e With SEATERM Click Capture on SEATERM s Toolbar Begin logging The hex data displayed in SEATE
96. tart logging Do not send IL until all existing data has been uploaded SBE 25 requires verification before it proceeds Example user input in bold S gt IL Initialize logging Y N y Are you sure Y N y symbol indicates Ctrl key Hold down Ctrl key while typing y or n 35 Section 4 Deploying and Operating SBE 25 Logging Commands continued Notes uploading data e Put the magnetic switch in the Off position to stop logging or GL Start logging now overwriting all logged data in SBE 25 memory Magnetic type Ctrl Z or click Stop on switch must be On when sending GL First SEATERM s Toolbar sample number and header number is set e You must stop logging before to 0 so any previously recorded data is written over regardless of whether memory has been initialized IL SBE 25 requires verification before it proceeds Example user input in bold S while communicating with SBE 25 put switch in On position S gt GL Start logging Y N y Are you sure Y N y symbol indicates Ctrl key Hold down Ctrl key while typing y or n hex data displays on SEATERM screen after a few seconds RL Resume logging writing data to memory without resetting sample or header number do not overwrite previously recorded data Magnetic switch must be On when sending RL SBE 25 requires verification before it proceeds Example user input in bold S while com
97. tial memory contents i e all zeros can be a useful cross check when data is retrieved S gt IR writing ram 0 writing ram 31 Initialize ram Y N y Are you sure Y N y symbol indicates Ctrl key Hold down Ctrl key while typing y or n Example user input in bold Initialize RAM memory QS 34 Quit session and place SBE 25 in quiescent sleep state 150 microamps Main power is turned off Memory retention is not affected Put SBE 25 in quiescent state for at least 3 seconds before putting magnetic switch in On position to start logging If not in quiescent state SBE 25 will not respond to movement of magnetic switch and will not begin logging Section 4 Deploying and Operating SBE 25 Notes e In SEATERM to save real time data to a file click Capture on the Toolbar before beginning logging e If the memory is filled to capacity data sampling and transmission of real time data continue but excess data is not saved in memory e The maximum number of casts in memory is 100 e If the SBE 25 is sampling data and the battery voltage is less than the cut off voltage the SBE 25 halts logging and displays WARNING LOW BATTERY VOLTAGE in response to DS Logging Commands Logging commands direct the SBE 25 to sample data When commanded to start logging the SBE 25 takes samples stores the data in its memory and transmits real time data Operation is depend
98. time data output rate in the header to calculate elapsed time File uploaded from SBE 25 memory SBE Data Processing uses the internal data storage rate in the header to calculate elapsed time Note See Pump Operation internal data storage rate scans sec 1 2 4 or 8 Z new value SBE 25 can store data at full sampling rate 8 scans second or can average data for storage Number of scans averaged in memory 8 internal data storage rate real time data output rate scans sec 1 2 4 or 8 Z new value SBE 25 can transmit real time data at full sampling rate 8 scans second or can average data for real time transmission Number of scans averaged and output real time 8 real time data output rate Real time data output rate cannot be faster than internal storage rate see previous prompt and is also dependent on baud rate and cable length see Real Time Setup pressure sensor range psia Z new value Range of SBE 29 pressure sensor from Calibration Sheet SBE 25 uses this to determine when to stop logging if you set stop CTD on upcast to Yes see below for prompt in CC pressure temperature compensation value Z new value Temperature Compensation TC value from SBE 29 pressure sensor Calibration Sheet SBE 25 uses this to correct pressure data corrected pressure data is stored in memory and transmitted real time minimum conductivity frequency for pump turn on Z new valu
99. tly to the pump intake Place pump exhaust above intake and DO S sensor with exhaust outlet corner up Secure each tubing connection with 2 cable ties not shown Tygon tubing Pump intake TC Duct DO sensor intake Quick release coupling me e Main plumbing is 13 mm ID x 19 mm OD 2m 1 2 inch x 3 4 inch Tygon tubing e A 18 mm 0 5 inch long piece of Place DO sensor with exhaust above 9 5 mm ID x 13 mm OD 3 8 inch x 1 2 inch Tygon tubing to fit to the main plumbing is IRR NGRIRE A 0 installed on the SBE 43 intake and exhaust DO sensor intake and exhaust tubing detail plenum hose 9 5 mm inner 1 diameter Tygon tubing 13 mm inner diameter Tygon tubing 13 mm long 17 Section 3 Power and Communications Test Section 3 Power and Communications Test This section describes software installation and the pre check procedure for preparing the SBE 25 for deployment The power and communications test will verify that the system works prior to deployment Software Installation Recommended minimum system requirements for running SEASOFT Win32 Pentium 90 CPU 64 Mbyte RAM Windows 98 or later If not already installed install SEATERM and other Sea Bird software Note programs on your computer using the supplied software CD It is possible to use the SBE 25 l Insert the CD in your CD drive without SEATERM by sending 2 Double click on Seasoft Win32 exe direct commands from a
100. troduction uersa reet orate p eoe Rhone en rk PR EP URS UP EEDE 5 About this Manual 5 cette ter te rented cele 5 How to Contact Sea Bird sesenta 5 Quick Start istae esee memo ene ei m UD D ERREUR ER 5 Unpacking SBE 25 enne cd si ecdesia tende eden 6 Section 2 Description of SBE 25 4 eeeee eee eres ee ee eese ee eene 7 System DeSCEIDLOR ose rere pee deo Per Pee rete rts 7 Specifications end iit get eh o Re tede oie uet ett e SR 11 Dimensions irte re ete db gi tee eee dte eee eos den 12 Main Housing End Cap Connectors eese 13 Magnetic Reed Switch requise eher tete es 14 Data I Q isset etre doeet enmt ettet 14 Batteries c 14 Battery End rahCe ecce ede pei eee dete eyes 14 Data Storage ssscciisicsecsseesttstessssssspesishssbasseudidatetusssesssyeoeacsebessocsones t p 15 Plurnibing iiineeet oer ERU HERE THREE RETE DRAN 15 Vertical Mount mtra RR D ERU ERR ED DEEE 16 Horizontal Mo nt eterne rote EGO a RE R 17 Section 3 Power and Communications Test 18 Software Installation essere 18 Test SOUP EM sugeacebves svethe ceantvsnesetectentehouecbarnee 18 MES EH G 19 Section 4 Deploying and Operating SBE 25 23 EAA T E motam bem ane ae erar 23 Normal Mode estate mer sn DR AE EO EUER 24 Standby Made e eR ee skh date dece rero teet 25 Pu
101. uctivity serial number not entered Ignore this message for now the serial numbers are required only when you upload data from the SBE 25 s memory and do not affect the operation of the instrument see Uploading Data in Section 4 Deploying and Operating SBE 25 In the Communications menu select Options Cycle baud when connecting Click Connect on the Toolbar SEATERM tries to connect to the SBE 25 at the baud set in Step 3 If it cannot it cycles through all other possible baud rates to try to connect When it connects the display looks like this SBE 25 SEALOGGER CTD power on S gt This shows that correct communications between the computer and the SBE 25 has been established If the system does not respond with the S gt prompt e Click Connect again e Verify the correct instrument was selected in the Configure menu and the settings were entered correctly in the Configuration Options dialog box Note that the baud rate is documented on the Configuration Sheet e Check cabling between the computer and SBE 25 21 Section 3 Power and Communications Test 6 Display SBE 25 status information by clicking Status on the Toolbar The display looks like this Note SBE 25 CTD V 4 1a SN 323 04 26 02 14 02 13 The SBE 25 automatically enters external pressure sensor range 5076 psia tcval 55 quiescent sleep state after xtal 9437363 clk 32767 107 vmain 10 1 iop 175 vlith 5 6 2 minutes without receiving a
102. uency for pump turn on 2950 CC pump delay 45 seconds CC battery type ALKALINE CC 7 external voltages sampled CC Stored voltage 0 external voltage 0 CC stored voltage 41 external voltage 1 CC stored voltage 42 external voltage 2 CC Stored voltage 43 external voltage 3 CC stored voltage 44 external voltage 4 CC Stored voltage 45 external voltage 5 CC stored voltage 6 external voltage 6 CC 29 Section 4 Deploying and Operating SBE 25 Note The SBE 25 s baud rate set with SRx must be the same as SEATERWM s baud rate set in the Configure menu Setup Commands ST SRx CC Set real time clock date and time S ST Example user input in bold Set date and time to 05 October 2002 12 00 00 date MMDDYY 100502 time HHMMSS 120000 x baud rate indicator for communication with SBE 25 12600 221200 329600 4 4800 If you change SBE 25 s baud rate SEATERM stops communicating Change SEATERM s baud rate to match In Configure menu select SBE 25 select new baud on COM Settings tab of Configuration Options dialog box and click OK Then click Connect on Toolbar to reconnect at new baud rate Baud resets to 600 if power is removed from PCBs by disassembly of electronics or using Reset button on battery bulkhead Baud set with SRx is used by data upload command DDb e Baud set with SRx does not affect baud rate controlled by data upload commands D
103. ummary of CTD configuration displays For the example above omitting details except for external voltages 2 external voltages sampled stored voltage 0 external voltage 4 Stored voltage 1 external voltage 6 When finished entering all parameters in response to prompts for CC a summary of CTD configuration displays as shown below This information is also included in response to DS Example CTD configuration summary after data entered with CC CTD configuration number of scans averaged 1 data stored at 8 scans per second real time data transmitted at 1 scans per second minimum conductivity frequency for pump turn on 3450 battery type ALKALINE 2 external voltages sampled stored voltage 0 external voltage 4 stored voltage 1 external voltage 6 33 Section 4 Deploying and Operating SBE 25 Setup Commands continued LWx IR x wait interval milliseconds after each line of data Normally set to 0 increase for very old slow computers Range 0 65535 Initialize memory which destroys all logged data in SBE 25 s memory SBE 25 requires you to enter IR twice to provide verification before it proceeds All data bits are set to 0 Sample number header number and data pointers are set to 0 Send IR after uploading all data Use of IR is optional as SBE 25 writes over previously recorded information when IL is used before beginning logging However knowledge of ini
104. ware e Timeout description e Command descriptions e Data format e Optimizing data quality e Setup for deployment e Deployment e Acquiring real time data with SEASAVE e Multiple deployments e Recovery physical handling and uploading data e Processing data Logging When logging the SBE 25 samples data at 8 Hz 8 samples second stores the data in its memory at a user defined rate CC and transmits the data real time at a user defined rate CC Each time the SBE 25 begins logging it writes a header to memory containing the cast number and date and time that logging was started The maximum number of casts in memory is 100 even if the amount of data in memory is below the memory capacity When the memory is full or more than 100 casts have been taken the SBE 25 will continue to operate and transmit real time data However the data will not be recorded in memory and will not overwrite previously recorded data There are two logging modes Normal and Standby The mode affects how logging is started and stopped and when power is applied to and removed from the sensors Descriptions follow Review the operation of the modes and the commands described in Command Descriptions before setting up your system 23 Section 4 Deploying and Operating SBE 25 Normal Mode Logging is started by e Putting the SBE 25 in quiescent sleep state QS waiting at least Note 3 seconds and then putting the magnetic s
105. witch in the On position Data The SBE 25 automatically is stored in memory after the last recorded data enters quiescent sleep state after 2 minutes without receiving a command OR e Putting the magnetic switch in the On position when not in quiescent state and then sending GL start logging overwriting any data in memory or RL resume logging adding data to memory after the last recorded data Power is applied as follows e Temperature conductivity and pressure sensors and sensors connected to the single ended input connector J4 and PAR connector J6 Power is applied when the switch is put in the On position e Pump Power is applied pump delay seconds after the minimum conductivity frequency is reached see Pump Operation Both the pump delay and the minimum conductivity frequency are user programmable with CC e Sensors connected to the differential input connector J5 Power is applied 5 seconds after power is applied to the pump to reduce the surge current required from the batteries at pump turn on As soon as logging is started the first data point is stored in memory and the cast header date and time is written Therefore the memory will include bad data at the beginning of the cast because e sensors depending on the pump conductivity optional dissolved oxygen etc will not provide good data until the pump turns on and e sensors connected to the differential input connector will not p

SBE 25 .SEALOGGER CTD

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