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SediMeter User Manual

1. Electrical Q Y coulomb C 1C 1 Ass charge flow Capacitance farad F 1F 1C V Resistance R ohm Q 1Q 1 V A Volume V cubic meter m Volume V liter L 1 L 10 m auxiliary unit 1 dm There are often different ways to express the same quantity e g 1 J 1 VC 1 VAs 1 Ws 1 3600 Wh or 1000 mAh 1 Ah 3600 As 3600 C 1 dm 1 L 0 001 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 39 OF 40 LINDORM COM Multiple prefixes Factor Prefix Prefix Name Symbol 10 tera T 10 giga G 10 mega M 10 kilo k 10 hekto h 10 deka da 10 10 deci d 10 centi c 10 milli m 10 micro u 10 nano n 10 pico p Notes If and only if the prefix is larger than kilo is it written with a capital letter The symbol unit never takes a plural s Correct kg Incorrect Kgs Use exponents for complex units Recommended kg m s Never write kg m s Use a space between value and unit Correct 12 V Incorrect 12V SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 40 OF 40
2. sleep and log modes Lige 32 uA Current during burst sampling Depends on sensors up to 15 mA Current idle RS485 mode 830 UA Discharge per measurement Y aa 15 MC Drain in MMC SD card idle 126 uA lt I lt 213 uA based on 3 cards 128 MB standard MMC 128 MB fast MMC 1 GB standard SD Discharge per record written 1 mC for internal flash 0 1 mC for memory cards The following formula can be used to estimate the battery requirement for a give time and number of measurements mission measurement where W ission 15 electrical the discharge of the entire mission in coulomb C Lae is idle current in ampere t is time in seconds s W neasurement 15 discharge per measurement in coulomb C and n is number of measurements the unit is 1 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 31 OF 40 LINDORM COM If V iio the battery has sufficient capacity Suitable batteries include SAFT LS14500 and Tadiran TL 5104 This battery type works well in cold weather and is more adversely affected by a hot climate The values are for 25 C If also considering the self discharge of 10 annually the following missions are all near the edge of the possible The assumption in all cases is that 2700 mAh batteries are used and if optional sensors are present they are only samples once not in an extended burst A Internal memory measurement interval 12 hours mission duration 4 5 years B Memory card 64 MB mea
3. DOC 2008 11 01 PAGE 35 OF 40 LINDORM COM way in the bit 1 52 us after switching level in 9600 baud During that time the signal will travel 10400 m that is to the end and back in a 5 2 km long cable The conclusion is that termination is not required for 1200 m cable lengths the longest permitted in the standard why no termination resistor is installed on the PC board If a future version supports an optional higher baud rate such as 115 200 baud then the termination will be required Note that with 9600 baud it takes over 0 5 s to download each record In the largest possible network 255 SediMeters it will therefore take well over 2 minutes to download all the data from one measurement This limits the possible measurement frequency the time for collecting the data which they do simultaneously must be added plus a few milliseconds for ordering the measurement The reason for introducing 115 200 baud as an option would be to increase the possible measurement frequency Regarding the number of SediMeters in the network the RS 485 standard defines load units and specifies that only 32 load units may be on the network at any one time However the chip used in the SediMeter only has a load of 1 8 load unit why 32 x 8 256 units can be on the network One of those being the computer it leaves 255 SediMeters That is also the number of available addresses NetAddr RS485 ID However for this to be true also the computer
4. and data Caplure diia 18 Post deployment procedures eee eese rr 18 OO 19 NAVPIN OPERATION EP 19 OVervieW 19 TORI dando dotados odon 20 A 20 DALE td 20 20 227 M 20 nm I M 21 TOTO D caved 21 MENO Dene EE E EEEE tse RAE ARE E ER ees TOE O E ARE 21 Error Bookmark not defined A 21 RSS A ii 21 pL M 22 STANDARD OPERATING PROCEDURES eee reete eee te enses natn tn atn ea tns tn tns tn enses enata sensn senem sensns tn sns tn snue 23 SIM 23 SERIAL COMMUNICATION cccssssssssssssssssssssesssssssssssesssnssssssssnssssssssssssssessesseasessesssasscsssssssacsssssesscsssseosaceraes 27 27 gy 27 OMU A A 28 SELECTING OPERATING MODE c 28 LA ART 29 MOG EE id sa 29 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 3 OF 40 LINDORM COM Sleep MOde
5. cannot be set using NavPin in v1 0 The individual menus and their operation are described in the following LogDator Selecting turns off the display All other clicks switches to another menu Mode Switch between RS485 mode for real time monitoring controlled by a remote computer Log Mode for self timed monitoring and Sleep Mode in which only the real time clock remains active Using Sleep Mode the SediMeter may be synchronized with a PC at the office transported to the field and then prepared using the NavPin with measurement time and interval As the final step select Log Mode Magnetic switch The reed switch beyond the display opposite the serial number sticker cycles through this menu The switch is operated by approaching a strong magnet to the instrument Each time the value changes the display is turned on for a short moment as visual feedback Date UTC The date in UTC Click select to enter edit mode click left or right to chose value to edit click up and down to edit the value and click select to stop editing The cursor blinks in the field that is active for editing Time UTC The time in UTC Click select to enter edit mode click left or right to chose value to edit click up and down to edit the value and click select to stop editing The cursor blinks in the field that is active for editing Interval Selects the interval between measurements in hours minutes seconds At present it only accepts
6. changes it in the opposite direction Select enters edit mode which is indicated visually by the presence of a cursor Left and right moves the cursor between the fields that can be edited in that particular menu Up and down changes the value Select 1 e pressing down exits edit mode with the presently indicated values Menu overview The menu system is shown in the following table SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 19 OF 40 LINDORM COM LogDator Mode Date UTC Time UTC Interval Next At Store On Memory Samples RS485 RS485 ID Display SM2 v1 4 RS485 ON 20071231 14 56 01 00 01 00 00 02 00 Internal 2MBflash opt 84 9600 bps Set 001 Turn Off turns off Log Mode set date set time set set MMC Card MarkRead set count Set ID turns off Sleep EraseAll At present only one baud rate is supported why any attempt to change the value will result in the same value being shown again The NavPin user interface can be used to prepare the SediMeter for stand alone measurements This eliminates the need for a computer in the field thus making it possible to prepare for measurements even on a small open diving boat If an MMC card is used for storing data retrieving data can also be done using a low cost vessel Note that the rate and count of optional analog sensor samples
7. download data or change memory card it is enough to remove the top plug To change batteries you must remove the cylinder too Changing batteries Use the NavPin to switch from Log mode to Sleep mode to prevent that a measurement takes place without batteries installed since that may drive down the voltage so much that a reset results The mode may be changed by approaching a magnet to the reed switch before opening the instrument on units so equipped Make sure the display is off and especially so if the display backlight is on In this situation you have several minutes of backup power available in a capacitor Exchange the batteries to new 3 6 V AA batteries with the minus pole towards the spring If other battery types become available in the future any size AA battery capable of delivering at least 15 mA at 3 V lt U lt 4 5 V can be used USB data download Switch to Sleep mode if not already done using the NavPin Connect the USB cable between the LogDator and the computer Start the SediMeter software and Connect Download the data using the Download tab Get the SediMeter settings using the Setup tab Check the clock error and take a note for reference Enter a new start time for resuming logging and click Set Switch back to Log mode in the Special tab Disconnect in the Connection tab Remove the USB cable and proceed to close the SediMeter For further instructions refer to the SediMeter Software Manual RS 485 data do
8. even minutes SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 20 OF 40 LINDORM COM Next At Selects the time of the next measurement in the same time zone as the clock Store On Selects the memory to use for data storage Internal or MMC Card Supported cards include standard MMC high speed MMC RS MMC with a holder and standard SD with 2 1 mm thickness MMC cards are 1 4 mm thick and have no notch SD cards have a notch on the side with a diagonal corner The following are not supported standard SD with 1 4 mm thickness SDHC high capacity all SD with more than 2 GB are SDHC Note that SD card has the tab set in the Lock position the SediMeter will not detect its presence The memory card will increase the power consumption As a general rule faster cards and cards with a higher capacity draw more current A large card will use up the battery long before the memory gets full The advice is therefore to use a small and old card if possible until such a time as the manufacturers begin to pay more attention to the need for low power low capacity memory for data logging purposes Memory This menu allows two operations that are not possible to do from the PC First it allows the RRP Read Record Pointer to be set equal to the WRP Write Record Pointer by selecting MarkRead This is useful if the memory was already read but got marked as unread by a system reset Secondly it allows all records in the flash me
9. handle outside the outer tube In the first case make sure the SediMeter does not float up In the second case carry the handle upside down so the anchor tube does not fall out Check for leaks Check the instrument house for leaks while descending and especially immediately it 15 dipped in the water If it leaks immediately return to the surface open it remove the batteries pour out all water First rinse with fresh preferably distilled water to drive out the salt then rinse with alcohol e g isopropyl 99 to drive out the water Finally drive out the alcohol if you use a blow dryer make sure no component is heated to above 50 C SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 12 OF 40 Lindorm Inc LINDORM COM Figure 8 The SediMeter with holder and handle ready for deployment Screwing down the holder tube CCW Note that the anchor screw operates counterclockwise as it has a left hand thread Place the handle over the outer tube so that the bayonet connects to the stainless steel pins on the anchor Fig 9 Place vertically on the bottom and screw down CCW until the pre determined depth SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 13 OF 40 Lindorm Inc LINDORM COM Rotate the handle slightly clockwise to disengage the bayonet and pull straight up Take care not to pull at an angle since doing so might scratch the surface of the polycarbonate holder tube Figure 9 A bayonet connects the handle to the anchor scr
10. must have a load of 1 8 load unit If the computer uses a standard 1 load unit RS 485 serial port then only 256 32 224 SediMeters may be on the network SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 36 OF 40 LINDORM COM How to calibrate the SediMeter sensor Note that the calibration is different depending on if the holder tube is used or not If you deploy the instrument both with and without do two separate calibrations 1 Deploy the sensor in a tube with 10 cm pure water in front of the sensor within 90 of the axis of measurement Block out ambient light especially NIR light Carry out a measurement Record the Uon values in V from each detector in the analysis graph Also check the Uoff values from each of the 6 zones Enter Uon values as U in column A in the calibration window of the software Enter Uoff normally near 0 as D Use B 1 386 and C 0 202 Prepare a Formazin suspension in the vessel use at least 100 FTU without holder tube and preferably 1000 FTU or more with holder tube 10 Carry out a measurement 11 Record the RAW values in V from each detector in the analysis graph 12 Calculate C RAW where is the conversion factor with units FBU V and C is the concentration in FTU 13 Enter the values in the calibration table and save the calibrations eS cuo Uh dx pur You are now ready to use the calibrations As a test you may leave the SediMeter measuring how the Formazin
11. performs a measurement only when instructed to do so by the N command for New measurement The data is not stored on flash memory but instead transferred to a RAM buffer from where the RS 485 master can request it using the P command for Previous measurement The computer will send an N as a broadcast wait until the SediMeters are finished then send a P to retrieve the data from one SediMeter at a time Log Mode In this mode the device is a stand alone instrument with an internal clock and a logger that stores measurement data either on a built in 2 MB flash memory or on a MMC or SD Card that may be up to two gigabyte in size The data is retrieved by removing the card and plugging that into a computer When the SediMeter is in Log Mode the Time for Next Measurement is updated as part of each measurement so that it always shows the time of the next measurement If the SediMeter is not in Log Mode the Time for Next Measurement does not change Sleep Mode This mode can be used for transportation and temporary storage for long term storage the battery should be removed a Reset will occur when it is powered up again It can be woken up using the NavPin through USB or even by pressing the Reset button User Interface Special Operation Modes USB The LogDator will automatically detect USB insertion regardless of which mode 1 set The USB chip is powered from the computer When in the USB state the LogDator switches from the in
12. to scratch the holder tube If it needs rinsing do so before assembly Use clean water and lint free wipes If salt has built up on the inside rinse with fresh water and if necessary blow a little ball of lint free cloth through using your lungs to help loose debris along Screw the holder tube onto the anchor screw The screw thread is 11 16 24 tpi UNF right hand Handle Remove the cotter pin from the handle bar insert the bar through the hole in the top of the handle tube and re insert the pin to lock the bar in place SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 10 OF 40 Lindorm Inc LINDORM COM Figure 6 Turn the cotter pin sideways as in this photo to get it in and out while inside the handle tube Once in place turn it back perpendicularly so it will stay safely in place Marking insertion depth Place the SediMeter outer tube and handle next to each other and aligned the way they interact Fig 7 Decide how deep you want to insert the SediMeter in the bottom If you expect sedimentation you may want to leave just 2 or 3 detectors buried and if you expect erosion you may want to leave all but 7 or 8 detectors buried Remember that the top 6 ones are used for estimating turbidity AAN a q A Figure 7 Lined up for measuring insertion depth on the handle tube Place a mark on the handle tube at your required insertion depth We suggest using electrical vinyl tape for a temporary mark You can als
13. 1 million baud Typically the computer would be in one end with a long cable to the first SediMeter and short cables connecting the following SediMeters to each other However another possibility is to have the computer in the middle with the two cable ends going out in different directions to two clusters of SediMeters on the same network In high speed communication the signal out may have shifted from high to low or vice versa before the previous signal has returned as an echo from the end of the cable its velocity is 200 Mm s In such cases termination is necessary The termination consists of a resistor across the pair at each end of the cable There should be no termination on the intermediate SediMeters or the computer if that is in the middle The termination resistors short through 120 Q the signal wires in each end This of course increases the power demand for driving them Furthermore the idle lines should have a certain voltage potential between them To maintain that difference biasing resistors are needed which increases the power demand also in idle The LogDator has pads for a termination resistor R22 size 0805 resistance 120 Q It also has a switch above the NavPin for turning termination on and off However at the currently only supported baud rate of 9600 baud the echoes are long since gone before the receiver samples the line with a 1200 m cable The line is sampled half SEDIMETER USER MANUAL
14. For short term storage set in Sleep mode For longer term storage remove the or s END 39 Leakage open the house remove the batteries pour out all water First rinse with fresh preferably distilled water to drive out the salt then rinse with alcohol e g isopropyl 99 to drive out the water Finally drive out the alcohol carefully wipe off the excess then consider using a fan If you use a blow dryer make sure no component is heated to above 50 C Finally let the device dry completely in a low humidity environment for 48 h before connecting power again Hint vacuum also helps removing moisture if you by any chance have a vacuum chamber big enough If it does not work after this treatment contact the manufacturer sesion C tomi Sa Spr teo END SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 26 OF 40 LINDORM COM Both protocols may be used with the SediMeter software with the recommended method in bold as follows Use RS 485 USB Set up self timed logging Yes Yes Download recorded data Yes but 100 times slower Yes than USB Logging while connected Yes when only physically Yes but a temperature bias connected is introduced if using the No when communication is standard sensor established Real time measurements Yes Yes but a temperature bias 1s introduced if using the standard sensor RS 485 For RS 485 to be operational the SediMe
15. If the screw anchor is used assemble the handle and descend to the SediMeter If you desire to re use the holder tUbe oooooooocccccnnncccnooooocccnnonoconanaannnnnnos 31 If the holder tube will not be 4 mene nnne 32 Using the hands or fins to create turbulence make a depression around the instrument that exposes all the reflex detectors on the SediMeter and a few centimeters ANOLE tada 32 Loosen the yellow finger screw and remove the SediMeter instrument from the holder ss 33 Slide the handle over the holder tube and push it down through the sediments while turning it alternately clockwise and counter clockwise to help it get down When the bayonet is reached rotate it until you feel that the bayonet lines up push it down hard and turn clockwise 34 Screw the anchor up clockwise When it is quite close to the surface you may lift it straight up do not use excessive force but unscrew it until it no longer makes resistance before pulp oil 35 Bring the SediMeter to the surface Rinse both the instrument and the handle in freshi di tU 36 Disassemble and dry the handle as per point 16 37 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 25 OF 40 LINDORM COM 37 Dry the instrument and open it To retrieve data connect a USB cable or RS 485 and download Since the USB or RS 485 supplies power the batteries are not required Tor this operation aire 38 38
16. Lindorm Inc LINDORM COM SediMeter User Manual final draft SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 1 OF 40 LINDORM COM Document Scope This 15 a user manual for SediMeter instruments model family SM2 The document does not cover the SediMeter software refer to the SediMeter Software Manual nor file formats serial communication protocols or similar refer to the SediMeter Tech Manual The sections on the LogDator computer are equally valid for the LogDator instrument Document Version Document version 1 0 2 dated 2008 11 01 Use and limitations This device is intended only for scientific and professional use whether in a laboratory or in nature under the water It uses and may emit radio frequency energy and it is not designed or tested with regard to radio interference The user is responsible for mitigating any problems that may arise The device 15 furthermore exempt from complying with the RoHS directive and it is not lead free traditional solder being used Recycling Apart from the electronics the materials of the instrument are polycarbonate black and clear stainless steel 316 equivalent to A4 and silicon filling in the sensor The yellow finger knob is an unknown plastic The holder tube is PC and the anchor screw 5316 The handle is aluminium in the 6060 range with an SS316 cotter pin Legal Notices Copyright This manual 15 Lindorm Inc 2008 All rights reserved Contact copyrightO li
17. SD card by pressing it in until you feel a click that releases it Remove it and put in the new one Check the display it may take several seconds for the card to be mounted If the display reads MMC Card Mounted all is well and you may proceed it will say MMC even if it is an SD card that is perfectly normal and not an error On the other hand if the display says MMC Card Error XX where XX is a two digit hexadecimal number the card is not mounted You may want to try again sometimes it works after several attempts If not try with another card Refer to the error codes for further debugging Hint Code 80 means that 1t cannot communicate at all 1 it 1 a non supported card Code 08 means that it cannot read the partition table which may be because the card is not formatted in FAT16 in which case it must be formatted in a computer However code 08 may also appear if the card was not reset properly so you may want to remove it wait a few seconds and try again or even press the SediMeter reset button with the card in place since that resets also works for the card and the built in memory chip If nothing happens after 5 s with an SD card check that the write protect slide is not engaged If it is the LogDator will not detect the card Each time a card is inserted or the SediMeter is reset with a card in place a new 1d2 file is created in its root folder The file name is constructed as follows Two digi
18. batteries can be used as a safety precaution in case RS485 power is lost Display Selecting turns off the display All other clicks switches to another menu SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 22 OF 40 LINDORM COM Guide 1 Using the NavPin user interface eoo uoi A A A Celo A A 2 Using a computer whether RS 485 or 5 6 2 Da 3 Retrieving data and or changing battery 19 End of mission TSMC vil E 30 3 Install batteries Press Reset Observe number of free records If sufficient TUD c 5 Display reads NO free records or an insufficient value less than 4096 4 Repeatedly click right on the NavPin to get to menu Memory Click select to enter edit mode and click up until MarkRead appears on the second line Click select to execute The text changes to MarkedOK when done Click any direction to return to the text 2MBflash Click select to again enter edit mode and up twice to show EraseAll Click select and it responds with ERASE N Click up or down and the last letter changes to ERASE Y Click select All records will now be erased a process that takes in the order Of a minute or more to execute When done the second line will read Erased Click right or left until you get to either the LogDator menu or the Dis
19. densation inside it after closing it Although you should always use a moisture absorbing desiccant inside the instrument house to protect against condensation keep the following in mind When the instrument is getting colder as in cold seas or in winter the dew point will be reached unless the air was very dry and or cold when closing the instrument In many cases the dew point is only a few degrees below the air temperature out at sea Unless the sea is warmer than the air you will need a desiccant Cleaning and sealing Make sure the o ring grooves and the cylinder mating surfaces are clean Especially look for fibers since any fiber such as a tiny hair or a fiber from a cloth or a paper towel when placed across the o ring will break the seal and allow water to enter Also make sure that the o rings are greased on all surfaces with a thin layer of grease There must be no dry spot whatsoever Removing o rings If there is dirt in the o ring groove if the o ring needs to get a new layer of grease if the o ring show signs of damage such as cracks or if it is time to replace the o ring due to age proceed to remove the o ring as follows Put your thumb on the o ring on one side of the cylinder and the index finger on the opposite side and push towards the same direction so that the o ring bulges up from its groove Gently push the bulge sideways so it leaves the groove and continue along both sides until it is completely out of the gr
20. e inner surface of the outer tube For turbidity profile measurements it is recommended to mount the instrument in some other way One possibility is to mount it upside down burying the logger house in the sea floor so that only the sensor sticks up That will also create the least drag It should be noted though that the instrument must be calibrated specifically for this mounting method It is possible to use a separate calibration file for use with and without outer tube and for an acrylic outer tube instead of a polycarbonate one the acrylic gives lower noise but is much more fragile SEDIMETER USER MANUAL DOC 2008 11 01 PAGE38 or 40 LINDORM COM Quantity Symbol Unit Symbol Definition Time t second 5 Base Unit Length 1 meter m Base Unit Mass m kilogram kg Base Unit Temperature T kelvin K Base Unit Luminous I candela Base Unit intensity Amount of n mole mol Base Unit matter Electrical I ampere A Base Unit current Solid angle Q steradian sr Force F newton N 1 kgms Pressure pascal Pa 1 Paz 1 Nim Energy work E W etc joule J 1J 1 Effect power P watt W 1W 1 Js Radiant Wsr intensity Irradiance W m Radiance W m sr Luminous flux lumen lm 1 Im 1 cd sr Illumination E lux Ix 11x 1 Imm Luminance Frequency f hertz Hz 1Hz 1s Electrical U volt V 1V 1W A potential difference
21. e mode in which it is controlled through RS 485 The operating mode can be set using the built in user interface the magnetic switch or by serial communication commands After a Reset the device is in RS485 Mode An Excel sheet is available for estimating battery and memory use http lindorm com downloads batteryuse xls Some values when using the internal memory are given below When using an MMC or SD card there is virtually no limit on how much data can be stored but the rather high battery consumption of the card becomes the limiting factor It is recommended to use as small a card as possible and at any rate not a high density card since they are not supported and as slow a card as possible since smaller and slower use less battery Mode Self Timed Remote Current drain in Battery Measurements Measurements rest Lifet RS485 No Yes 830 uA 102 days Log Yes No 32 uA 4 years Sleep No No 32 4 25 years Battery life is calculated based 7560 2 1 Ah useable capacity and one measurement per hour without any optional sensors Note that the internal memory will get full after only 170 days at this measurement rate In RS485 mode the power would typically be supplied through the cable The battery life 1s the life absent such supply This value is excluding any memory card Selecting operating mode RS485 is selected for remote operation The real time clock interval o
22. ediMeter can be used close to the surface even in daytime It should be noted that if FBU U the ambient light is strong enough it may saturate the detectors 0 B U they are nearly but not U U amb quite saturated low turbidity levels may still Uo Uon when FTU 0 in water with no reflectors be possible to measure U dark in darkness where y adjustment for U c U U iar 15 the ambient light amb amb amb but not high turbidity since background light U amp U are reported by the SediMeter and reflected light is Kpry 15 proportionality constant determined in darkness added in the signal Calibrations values in the software for each OBS unless noted The effect in the software analysis window may be that correct values are reported in the water but invalid data is shown below the D U one value for each of the 6 zones bottom This allows the user to at least estimate the water turbidity and a maximum bed elevation but not the exact bed elevation or a minimum for it This compromise was deemed acceptable in order to increase the turbidity resolution It is possible to change the range by replacing resistors AO to A5 contact the factory if the need arises Optimizing Turbidity Accuracy Turbidity accuracy after calibration when using a polycarbonate outer tube is ca 100 FBU most of the uncertainty stems from variations in reflections on th
23. er screw Handle bar Plug long e Handle cotter pin Cylinder O Figure 1 The main parts The handle tube is now anodized yellow and the bar in blue Optional sensors Backlight E Figure 2 The logic unit of the SediMeter the LogDator The printed circuit board PCB under the front panel is exposed for illustration only in normal use the front panel SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 5 OF 40 LINDORM COM should never be removed The user interface consists of the NavPin a tact switch with 4 directions plus select the display and the Reset button Using a thin object the Reset button is accessible through the opening in the front panel The display can be used with or without backlight The switch for turning backlight on and off is located almost under the black cap of the NavPin it is the closer one in the double switch the farther one is for RS 485 termination The USB and memory card slot are accessed from the end through panel openings If RS 485 UW contacts are installed they are connected using the indicated RS 485 PCB connector If optional sensors are installed they are connected via cables to the bottom left analog part of the LogDator Dator is Swedish for computer SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 6 OF 40 LINDORM COM Deployment Avoid moisture due to the condensation risk Pay attention to the humidity when servicing the SediMeter to avoid con
24. ew It does not lock in place so if transporting them together while swimming hold the anchor screw upwards to prevent it from falling out Note Newer handles are anodized yellow for better corrosion protection Placing the instrument in the holder Pick up the SediMeter and hold it vertically Carefully slide the SediMeter into the holder tube Make sure it does not scratch at the entrance When it is down all the way so the outer tube is about 2 cm into the end of the SediMeter tighten the yellow finger screw until the SediMeter is no longer loose lift it to test Do not over tighten as that will break the outer tube Post dive procedures Rinsing the handle Disassemble the handle in its 3 components and rinse in fresh water Rinse especially carefully inside the tube since any salt accumulation there risks scratching the holder tube After removing all traces of salt dry the tube push or blow a cloth through the tube to dry it inside and store it in a dry place Note that the cotter pin is stainless steel To prevent galvanic corrosion it should not be left in the aluminium cross bar unless both components are absolutely dry and free of salt For maximum protection do not assemble the parts for storage SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 14 OF 40 Lindorm Inc LINDORM COM Temporary retrieval for getting data and or replacing batteries Preparation Bring fresh water for rinsing and lint free towels It is reco
25. h back to Log Mode SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 34 OF 40 LINDORM COM Considerations The computer must have an RS 485 serial port USB to RS 485 adapter may be used One pair in a twisted pair cable is used for the signals A and B One of the two is normally positive the other normally negative Unfortunately a majority of manufacturers have A and B opposite to the standard why a trial and error approach may be necessary 1f an unfamiliar port device is used The second twisted pair or straight wires may be used for power supply to the SediMeter This is not necessary but considering the high power demand of the SediMeter in RS485 mode which it needs to be in to allow communication by RS 485 in most cases it is clearly preferable If the cable is long and many instruments are connected calculate to make sure that a thick enough wire is used AWG in the US Most power for the measurements are provided by an internal super capacitor It is charged up slowly through an internal current limiting resistor R6 the only hole mounted resistor If the cable itself has a significant resistance one can short R6 to limit the voltage drop and permit faster re charge times A diode prevents current from flowing out from the super capacitor so each instrument depends on its own capacitor RS 485 network topology is a daisy chain with all units connected along a single cable that may be up to 1200 m long with full speed
26. icon 29 USER INTERFACE SPECIAL OPERATION MODES 29 USB csl uU PP CUTE 29 Display and Neat 30 SPECIFICATIONS 31 DIMENSIONS AND WEIGHTS 31 CURRENT USE AND BATTERY LIFETIME ESTIMATE eee eee nennen n nnne nennen nne entes erret nnns entres 31 MEMORY CARD FUNCTIONALITY 33 INSERTION E tratarla 33 CREATION dai b tesi UG e cereus dod Casas A er deoa us 33 MEMORY CARD SELECTION ccssscscssssscscssecessssseescssneuscscesuscsneusessususesususessnsusesnsusesensusesnsusesensusosensusosensusosenens 33 EXCHANGING MEMORY CARD DURING LOGGING eene eene tetti tettetett testte 34 SETTING UP AN RS 485 NETWORK e eee ee eene e eene een seen ete o etes estne seen seen esses eene seen seen seen seen esten essa 35 CONSIDERATIONS nSSHRSSURHERSHREHRNRRRERHEERERRHRERRRHRHEHSHRHRERERHAERUAHERGHRRRHAHEHS 35 CALIBRATION 2 2 ceoce dee coo Qe eG dee de ee ran ego 37 OPTIMIZING TURBIDITY ACCURACY wacsssssssssscessesessossescscestesescesscsesonssescsonstssebcessetescnssescsoussescbcessesesensvessseus 38 APPENDIX THE SES YS UULTUS 39 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 4 OF 40 Lindorm Inc LINDORM COM Overview of Parts Anchor screw SediMeter sensor amp LogDator Spring A K Holder tube Handle tube Fing
27. if the card is in the holder during a Reset a new file will be created Since the Reset sets the date and time to 2007 12 31 00 00 00 the file name will be 07C31000 1d2 the modification date as the creation date and the size zero 0 To get a file with correct date in the name take out the card before resetting the LogDator and set at least the date before re inserting the card Memory Card Selection As default the LogDator records data on the internal memory Use the NavPin to switch from Internal to MMC Card this also covers SD cards If no MMC or SD card is mounted when the NavPin is depressed for selection it automatically switches back to Internal The same happens if the card is removed during logging although you should turn Log Mode off before removing the card to avoid the risk that you remove the card while it is recording data SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 33 OF 40 LINDORM COM Exchanging memory card during logging e Switch to Sleep mode using the NavPin if a measurement is in progress the display may be unresponsive for up to 166 s 83 sample intervals 0 5 Hz while burst samples are being collected Remove the old card Insert the new card and check that the display says Card Mounted Check that the time of next measurement is in the future i e that the clock did not pass the next time while you switched cards If necessary change the Next time Switc
28. linder and place it in its groove Finally you may want to remove traces of o ring grease left behind to avoid that it attracts dirt It may be easier to just cover the logger with clean plastics taped in place Desiccant When the SediMeter s LogDator has been prepared and set up the final step before closing the lid is to place a bag of desiccant inside The reason is that there is a certain amount of humidity in the air that will be trapped and if the instrument gets cooled down sufficiently that humidity will condensate which may cause malfunction Figure 3 When closing the lid after making sure the o ring and its groove and mating surfaces are clean and the o ring is greased push it in until it makes resistance At that time give it a twist to easily get the o ring into the cylinder without risking harm to the o ring a red o ring is used on the photos for clarity the real o ring is black Closing the lid It does not matter if you first place the top lid on the cylinder and then the cylinder on the SediMeter itself or if you do it in the opposite order In any case you may find that the lid SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 8 OF 40 Lindorm Inc LINDORM COM wants to come off as a result of the pressure inside the cylinder This is a good sign since it shows that the o rings are sealing Figure 4 Closing the spring Hold the lid down while you swing the locking spring in place Fig 4 Push on the be
29. mmended to cap the tube while the SediMeter is gone both because the transparent tube is very hard to see and to prevent dirt from getting in A black or yellow cap or plastic bolt is recommended the colour depending on the colour of the bottom The tube has 20 mm outside diameter 16 mm inside Another tip is to use the handle as a marker Diver procedures When reaching the SediMeter we recommend recording the bottom level and taking a photo to serve as ground truth Loosen the finger screw carefully remove the SediMeter and cap the tube with the marker or the handle Opening and data capture When the SediMeter is back above the surface it should be rinsed in fresh water and the instrument house dried Never let salt water dry on the sensor If possible use compressed air to blow away some of the water sitting under the cylinder but outside the o rings A lint free cloth can also be used to get the water out by capillary action Figure 10 To open push on the spring s corners SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 15 OF 40 LINDORM COM It 15 best to let a non diving and thus dry person open the SediMeter If that 15 not possible you should dry your hair and face so you will not drip then rinse your hands with fresh water and dry them When both the hands and the SediMeter are salt free and dry open the spring Hold the cylinder with both hands and push on the bends of the spring with your thumbs Fig 10 To
30. mory to be erased Normally the memory is used in a round robin fashion so as to use all pages equally and not wear out the beginning there 15 a limit to how many times flash memory can be used and certain applications might exceed that limit for the first page 1f not using a round robin scheme To erase all requires the user to first select EraseAll and then confirm it by shifting from Erase N to Erase Y and finally clicking select The erasing takes ca 20 seconds Check the real time clock after erasing the memory as it may have been affected Samples For each measurement the optional sensors can be sampled up to 84 times Set the count in this menu Set to 0 if no optional sensors are present since it conserves battery power RS485 RS 485 baud rate The only choice is 9600 baud RS485 ID The RS 485 network ID called NetAddr in the computer software can be changed here If more than one SediMeter is on the same network they must have unique IDs The ID is a SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 21 OF 40 LINDORM COM value from 1 to 255 Each SediMeter has a pre programmed ID Only in the unlikely event that two SediMeters with the same ID happen to be on the same network must one of them have its ID changed It can be changed either using this menu or the PC software The changed value is stored in RAM so after each reset the ID returns to the default value The RAM retains its values down to 1 8 V so two alkaline
31. n settings http lindorm com downloads batteryuse xls SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 32 OF 40 LINDORM COM MMC cards MMCplus cards and SD cards can be used and have been tested RS MMC MMCmobile and MMCmicro are expected to work with the appropriate adapter since they differ only in size from the former but they have not been tested The card must be formatted in the FATI16 file system this may also be called FAT in formatting software Note that SDHD cards high density SD are not supported Insertion When the card is inserted an interrupt is hardware generated to the MPU The CPU will wake up and shall establish communication with the MMC card An error code is reported on the display if something goes wrong If everything goes well the display reports that the card is mounted File creation Each time the card is inserted a new file is created on the first free sector Multiple insertions and removals thus blocks a number of sectors by creating directory entries although no data is actually written These O sized files can be deleted in a computer but not in the LogDator itself The name of the file reflects the time of creation with the month represented as one hexadecimal character in the range 1 to The file name is thus YYMDDXXX sd2 where XXX is a number updated for each new file created the same day The date and time in the directory entry reflects the last modification of the file Note that
32. nd of the spring to make it mate with the groove on the lid Some springs when they are new may need a little bit of help in opening up around the cylinder Make sure it slips into the groove all the way around Finally check that the ends of the spring are not coming out of their holes If they are push them back in the bend should be within a mm or two from the plastic The purpose of the spring The purpose of the spring is just to hold the lid in place on land As soon as the SediMeter gets under water the water pressure will hold the lid in place SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 9 OF 40 Lindorm Inc LINDORM COM 9 Figure 5 The battery compartment holds two size 3 6 Li primary batteries Cleaning the sensor Use the protective cover on the sensor whenever handling the instrument As the last preparation remove the protection and using clean water and a non abrading wipe clean off the sensor surface Substances that can not be dissolved with water may be cleaned off using isopropyl alcohol but do not let the alcohol sit for more than some seconds on the polycarbonate surface since prolonged exposure may turn the plastic white and ruin the sensor If in any doubt try on the rear side of the sensor first Polycarbonate is impact resistant but rather sensitive to scratches Never let the sensor get in contact with hard surfaces or objects Preparation for the dive Holder tube Be careful not
33. nder Bring carefully into the water while looking at the o ring seals checking for any sign of water leaking into the house While descending towards the bottom keep checking for signs of water leakage If no leakage is 10 If water is entering hold the instrument so the water accumulates in a spot away from the PCB while returning to the surface Proceed with emergency inr HDI arios 30 Deploying in sediments using the anchor and holder tube 11 Deploying on hard bottoms upside 17 Screw the holder tube onto the stainless steel anchor Put the handle bar through the hole on the handle tube and secure it with the cotter pin Attach the handle to the anchor over the tube Hold the SediMeter next to it and put on a tape or similar on the handle to mark the desired depth of insertion into the bottom Pass the SediMeter and the handle holder assembly to a diver or s rkeleralr ady in the Water id 12 Dive to the bottom If the SediMeter is properly ballasted it can be parked on the bottom with the probe pointing up thus freeing up both hands 13 Screw down the anchor to the indicated depth by turning counterclockwise keeping it vertical Turn the handle clockwise some 10 20 Lift it straight up ntil it is free from th holdet 15 Insert the SediMe
34. ndorm com to request permission to use the material Warranty The instrument has a 12 month warranty against defects in material or workmanship Contact the factory or the place you bought the instrument to obtain an RMA before returning it for repairs No express or implied warranty is made regarding the usefulness for a specific purpose beyond what is mandated by applicable law The user must verify that the device performs in the way required by the specific circumstances SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 2 OF 40 LINDORM COM Contents DOCUMENT SCOPE P 2 Document Versiono aeea dead 2 MUA a lente a E aR 2 LEGAL OA ULE E E EE E E ada 2 ias 2 da 2 OVERVIEW OF 5 STANDARD 7 7 Cleaning and 7 Pra NA ea 10 Under Water procedi il 12 RTT RUE 14 TEMPORARY RETRIEVAL FOR GETTING DATA AND OR REPLACING BATTERIES 15 Prepara OW 15 Diver PRO CEAUIES iaa 15 soo ee e E EE NEE EE 15 RETRIEVING AT END OF MISSION 17 Preparan ON sao 17 Diver procedures ir 17 Opening
35. o make a permanent mark with a marker on the anodized tube Buoyancy It is more convenient to handle objects on the bottom such as the SediMeter if they are heavier than water You may want to check that the SediMeter really has negative buoyancy and if that is not the case tape some ballast inside it or on its top end Diver considerations It is easier to screw the anchor into the bottom if the diver can maintain negative buoyancy at the bottom We recommend at least a couple of kg of negative buoyancy with empty SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 11 OF 40 LINDORM COM buoyancy vest or dry suit The heavier the better but keep in mind the safety and the capacity of the vest or suit It is also possible to deploy the SediMeter by snorkeling in shallow waters Count on making several dives to screw the anchor all the way down Unless you have neutral or negative buoyancy you have to swim downwards while screwing which is difficult but not impossible We recommend a weight belt for neutral buoyancy or better negative buoyancy in combination with a safety vest and a flotation device at the surface for resting Under water procedures Carrying the SediMeter You need to bring 3 things to the bottom The SediMeter instrument itself the outer tube with anchor screw and the handle Fig 8 If it has to be brought by one person in one dive there are two options placing the SediMeter inside the outer tube or placing the
36. oove If you are removing the lower o ring you must roll it over the LogDator Be careful not to slide it especially over the display or any exposed metal edge that could damage it As an extra precaution one may cover the logger with some clean plastic or tape over the metal parts Cleaning and greasing o rings First clean out the o ring grooves then the o rings themselves Use a lint free cloth to gently wipe off dust dirt and old grease Work in an environment that is as dust free as possible Clothes household paper towels and windy beaches should absolutely be avoided Apply a thin but covering coat of o ring grease by spreading it out with your fingers use single use gloves for even less contamination risk plus it keeps you clean Pull the o ring between your fingers several revolutions until every spot for sure is covered SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 7 OF 40 Lindorm Inc LINDORM COM Replacing o rings Make sure that the o ring groove and the surrounding surfaces are clean and most importantly free from fibers Place the o ring into the groove on one side and push it with your fingers along both sides so it slides in completely To replace the o ring in the lower end under the LogDator first clean very carefully the entire length of the LogDator house Be careful not to wet the display when cleaning though Use a moist lint free wipe to clean off any dust and fibers Then roll the o ring down the cy
37. play Turn Off menu Clicking select in either of those turns the display off Press Reset again Observe the value it should be 4096 Value Set Date Time Next start of measurements Interval time between measurements and Samples optional sensors All times are in 24 hour format The first measurement will take place when the clock reaches the Next time provided that Log Mode is active If the deployment is more than 24 hours into the future select Sleep mode otherwise select Log Mode 7 Set up the LogDator following instructions in the SediMeter Software Manual J If you plan to use an MMC card install it make sure the display says MMC Card Mounted and select Store On MMC Card using the NavPin 8 If the SediMeter is buoyant a small ballast may be used in the house e g small bag with nuts The required amount is in the order of tens of grams rather than hundreds of grams dad 9 Make sure both o rings are clean and are completely covered by a thin layer of grease Examine closely to make sure there are no fibers threads or hair on the o rings in the grooves or on the cylinder s seating surface Assemble SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 23 OF 40 LINDORM COM 10 11 12 13 15 16 17 18 19 the house and close the spring Inspect the o ring seals around the cylinder making sure they are in contact with the cyli
38. r start time are not used to trigger measurements Instead measurements are triggered by commands over the network These may be either broadcast to all instruments or sent to a specific instrument The only setting that 1s still used is the interval between analog measurements For fastest response especially if no analog sensors are present set 0 For self timed logging set to Log Mode Also set date time interval and start time Data can be stored either internally or on a memory card MMC or SD The data are transferred to a computer by moving the card to a computer and opening the 142 file using the SediMeter software If the internal memory is used the recorded data can be transferred to a computer through USB or RS 485 but it is much slower 40 minutes to download the entire memory SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 28 OF 40 LINDORM COM The instrument can also be set in Sleep mode in which neither logging nor remote operation 1s possible Settings are still retained and the real time clock remains running This mode may be used when transporting the instrument or storing it for shorter periods RS485 Mode In this mode the device is functioning as a remote controlled instrument without internal data logging It 15 the default mode after Reset The instrument is listening to RS 485 communication It is not performing any self triggered measurements regardless of the logging interval and start time settings It
39. se the instrument with fresh water and blow to remove most drops from around the O rings If using something to dry it with make sure it does not abrade the plastic and that it does not leave fibers on the surface 21 Un snap the spring lock To replace batteries 23 To exch nge memory card Only Ra 24 Remove the cylinder and the upper plug Use the NavPin to switch to Sleep mode or the magnetic switch Replace the batteries 25 Remove We Upper RR 25 Press the memory card in so it clicks and ejects Pull it out Put in a new memory card pushing it in so far that 1t clicks and locks in place Verify that the display reads MMC Card Mounted sse eee 26 If the display reads MMC Card Error followed by an error code or nothing 27 Using the NavPin go to the Store On menu and change to MMC Card 28 Try again a few times then reformat the card as FAT16 If nothing helps use another card If no reply for an SD card check the write protection 25 Check the O rings assemble and descend as per step 9 29 Insert the SediMeter probe carefully into the holder all the way Secure it with the yellow finger screw Be careful not to disturb the bottom near the instrument if a continuous measurement series is desired ee eee eee eee END
40. settles It will take a few hours to start seeing the process Theory The data from the sensor are translated to FTU values called FBU for Formazin Backscatter Units using the equation shown in the box It takes the background light into account in the form of a second degree equation U The background light is measured virtually simultaneously with the backscatter so as to account for the very fast order of magnitude fluctuations that are present when sunlight shines through waves in shallow tropical waters In fact the procedure is to measure the background the backscatter the background again and to interpolate the two background values to estimate the value at the same millisecond when the backscatter was measured While the units may correctly be labeled FTU the use of the SediMeter unit FBU is more specific since it shows that the measurement was made with 945 nm light 180 backscatter and with compensation for the contemporary ambient light according to this method The ambient light is measured after a black filter that only allows NIR light to pass Since NIR SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 37 OF 40 LINDORM COM is attenuated very quickly in water even quicker than red light and the LED emits a strong strobe ambient light 1 only a factor in the first couple of meters in tropical waters and perhaps the first meter in extra tropical waters However by introducing this procedure to compensate for it the S
41. surement interval 6 minutes mission duration 1 year C Memory card 128 MB measurement interval 1 minute mission duration 6 months D Memory card 256 MB measurement interval 5 seconds mission duration 30 days Due to the high idle current of memory cards any card with higher capacity than 256 MB will exhaust the battery before the memory is full even at the most extreme measurement rate The recommendation is to use as small a card as possible and the old standard speed of MMC rather than the new high speed since capacity and speed are the two factors that seem to increase the idle current Contrary to in many other fields old cards are thus preferable Unfortunately there is currently no development pressure to lower the power consumption in these cards nor do the manufacturers make those data available to the buyers When planning a mission always leave some margin on the batteries It is better to replace half empty batteries than to have them run out halfway through the deployment These values may help to give you an idea It would take over 600 000 measurements to empty the batteries if the idle current was zero corresponding to ca 300 MB in storage space The idle current and self discharge together will empty the batteries in about 5 years even if no measurements are made i e in sleep mode if there was no self discharge they would last for over 9 years You may also download an Excel spreadsheet for estimating optimal missio
42. ter must be in RS485 mode After a Reset it automatically enters RS485 mode Once it has been set in sleep mode or logging mode it can only be returned to RS485 mode by 1 a Reset 2 by using the magnetic switch 3 through the NavPin user interface or 4 by issuing commands through USB For an instrument under water only methods 1 and 2 work For method 1 the power must be cut long enough for a Reset to take place it means that the instrument must not have batteries installed For method 2 a diver must approach the magnet to the instrument Self timed measurements are suppressed while in RS485 mode but externally ordered real time measurements can be made using command N If the computer does not have RS 485 built in an adapter from USB to RS 485 may be used USB Measurements can be made while the USB is connected However be aware that while in USB mode the CPU 1 running on a much higher clock frequency which warms up the computer so that the temperature reading from the standard sensor no longer is reliable It will show the computer temperature not the ambient temperature In normal use as a logger the duty cycle of the computer is so low and constant from measurement to measurement that the sensor for all intents and purposes shows the ambient temperature SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 27 OF 40 LINDORM COM The device has one inactive mode and two operating modes a stand alone Log Mode and a remot
43. ter probe carefully into the holder all the way Secure it with the yellow finger screw do not over 16 Return the handle to the surface disassemble and rinse off the components inside and outside with fresh water Let it dry before storing END Drill a hole with diameter 55 mm and at least 34 cm deep 18 Insert the SediMeter without yellow finger knob instrument first into the hole and place ballast e g a donut shaped weight to hold it in place END Loosen the yellow finger knob pull out the SediMeter and bring to the surface Note 1 Since the holder tube is very hard to see without the SediMeter in it it is recommended to use some kind of marker in the meantime It could be as simple as a white plastic bolt inserted into the transparent tube perhaps with a white plastic strip attached to it This also prevents debris from falling into the tube Note 2 Make sure not to disturb the bottom around the SediMeter if a continuous measurement record is desired It is much easier for a SCUBA diver to maneuver precisely using a buoyancy vest than it is when snorkeliNg coooonoonoccconcnononononancnnnnncncnonnnnannncncnnnnnnns 20 SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 24 OF 40 LINDORM COM 20 21 23 24 25 26 27 28 29 30 31 32 33 34 35 36 If possible rin
44. ternal oscillator on the MPU to an external 3 6 Mhz crystal This increases the power demand also for components not supplied by the computer Therefore either disconnect the USB whenever it is not needed or remove the batteries The higher velocity and continuously running system clock leads to that the MPU warms up more The temperature measurements may therefore be too high for a while after disconnecting USB As the USB uses the same serial port as the SediMeter probe measurements will conflict with USB SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 29 OF 40 LINDORM COM Display and NavPin The LCD without backlight is rather low on power and using it for a few minutes will not have any appreciable effect on the battery lifetime However for every second the backlight is on it draws the same amount of power as one measurement does The display backlight is turned on and off using the switch immediately above the NavPin 2 on the dual switch 1 is for RS 485 termination SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 30 OF 40 LINDORM COM Dimensions and weights Length overall 700 mm House diameter 51 mm Sensor length 510 mm Sensor diameter 15 mm Volume 0 4 L Mass as deployed ca 0 4 kg Buoyancy Nearly neutral Current use and battery lifetime estimate If you are unfamiliar with the SI units refer to the appendix Batteries 2 size AA 3 6 V Li batteries Battery Capacity 7560 2100 mAh Current idle
45. ts for the year one for the month with range 0 two for the day and three digits for the file number on that date 000 999 The files can not be erased in the SediMeter and they have the read only flag set to prevent inadvertent modification in a computer The modified date shows the last time data was written to the file If all is well proceed to set a new start time using the NavPin since some measurement may have been lost while you changed the card Finally switch back to Log Mode and turn off the display Proceed to close the SediMeter Retrieving at end of mission Preparation Bring fresh water for rinsing and lint free towels Assemble the handle Diver procedures When reaching the SediMeter put away the handle temporarily on the sea floor You may want to record the bottom level relative the sensor and take a close up photo SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 17 OF 40 LINDORM COM To protect the tube from scratches in the active measurement zone when forcing the handle down to the anchor first make a depression to the depth of the lowermost detector Use hands or flippers Loosen the finger screw remove the SediMeter and leave it in a safe place Push down the handle twisting it right and left while pushing until it reaches the anchor and connects to the bayonet Screw the anchor up clockwise If the anchor is shallow and the sediments are soft you may also be able to pull it up gently by the holder
46. tube You can safely twist clockwise without risking unscrewing the tube since the holder tube has got a clockwise thread and the anchor a counterclockwise thread Opening and data capture Use the same method described above for retrieving data Post deployment procedures Rinse and dry all components Remove batteries Insert desiccant and close the SediMeter Clean the handle as described above Clean the holder tube carefully if it will be re used If it is scratched beyond repair discard it Rinse the anchor from sand and mud and let dry A note on scratches Large scratches that are shiny in the bottom are not so much a concern since they will not reflect much light Remember that they get filled with water and become almost invisible once submerged The concern is the small and white scratches that will trap air under water It is theoretically possible to polish tiny scratches such as those left by polishing with a very fine sand paper by warming the surface with a hot air gun Polycarbonate PC melts at over 120 C However it absorbs moisture and when it reaches 100 C the water starts boiling creating vapor bubbles in the plastic unless it is dried first The drying procedure is incompatible with the sensor but the holder tube might be salvageable If the PC material is not dried a hot air gun can still be used to remove the finest scratches but the exposure time must be kept to seconds The creation of bubbles goes
47. very quickly it destroys the product permanently and the method should never be attempted except as the absolutely last resort The method requires a lot of practice but even with practice it is very risky It is better to accept one or two bad detectors than to try polishing and risk ruining the entire sensor SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 18 OF 40 Lindorm Inc LINDORM COM User Interface Different versions of SediMeters may be operated either by using a built in user interface with a control stick called NavPin or by software connected either through USB or RS 485 The SediMeter has a built in real time clock that is programmed to keep track of time in UTC similar to GMT it 15 the time at the O meridian This eliminates the need to keep track of time zones and seasonal time changes daylight savings time summer time When setting the time from a computer the clock is automatically set to within ca 0 02 seconds Just remember that when setting the start time of measurements one must set that too in UTC Figure 3 Operation of the NavPin It may also be operated with the cylinder in place use a finger if your thumb does not fit The backlight is on in this photo but in most cases it may be preferable to leave 1t off to save power NavPin operation The NavPin can be tilted in four directions up down left right and pressed straight down select Left or down changes the menu in one direction right or up
48. wnload Although not originally intended for downloads it is possible to download data over the RS 485 serial communication link You do need a contact and cable though and it is rather slow 9600 baud Note that if the instrument has an UW connector and an UW cable is available data may be downloaded without retrieving the instrument The diver would instead connect the cable change the SediMeter to RS485 mode using the magnetic switch and when the download was complete disconnect the cable again Otherwise the procedure is the same as below Connect RS 485 cable between the LogDator and the computer Switch to RS485 mode using the NavPin or the magnetic switch Start the SediMeter software and click Connect Download the data using the Download tab Get the SediMeter settings using the Setup tab Check the clock error and take a note for reference Enter a new start time for resuming logging and click Set Switch back to Log mode in the Special tab An error message appears saying that no reply came that is because the mode change cut off the SEDIMETER USER MANUAL DOC 2008 11 01 PAGE 16 OF 40 LINDORM COM connection Disconnect in the Connection tab to free the serial port Remove the cable and replace the dummy to protect the connector For further instructions refer to the SediMeter Software Manual Memory card exchange Switch to Sleep mode if not already done using the NavPin or the magnetic switch Remove the MMC or

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