idronaut Ocean Seven 304Plus, Operator'S Manual

Page 1: ......

Page 2: ...xpressed or implied including but not limited to the implied warranties of merchantability and fitness for a particular purpose Idronaut S r l may make changes of improvements in the equipment software firmware or specifications described in this document at any time and without notice These changes may be incorporated in new releases of this document This document may contain technical inaccuraci...

Page 3: ...n at the sampling site when it is ready for deployment VERY IMPORTANT Allow a 30 second interval between each ON OFF cycle LABORATORY USE When the CTD is to be used in the laboratory to verify the measurement performance or to perform the CTD sensor calibration please interface the CTD from a portable computer battery powered In fact using desktop computers may generate ground loops and interferen...

Page 4: ...ensor is a high quality transducer which can last many years if properly used Its replacement is difficult and requires that the CTD is returned to IDRONAUT INTERFACING THE OCEAN SEVEN 304Plus The OCEAN SEVEN 304Plus CTD can be interfaced in different ways depending on the type of action to be performed The below solutions must be adopted to guarantee that the OCEAN SEVEN 304Plus CTD satisfies the...

Page 5: ...ion 7 1 10 9 Configuration and Calibration 7 1 10 10 Menu submenu structure 8 1 11 CALCULATIONS 8 1 12 SENSOR SPECIFICATION 9 1 13 OPTIONAL SENSOR SPECIFICATIONS 9 1 14 THE SENSORS 9 1 14 1 The pressure sensor 9 1 14 2 The temperature sensor 10 1 14 3 The conductivity sensor equipped with the IDRONAUT seven ring cell 10 1 15 ELECTRONIC SPECIFICATIONS 11 1 16 PHYSICAL CHARACTERISTICS 11 2 INSTALLAT...

Page 6: ...4 2 2 Field operations 34 4 2 3 Ending the unattended data acquisitions 35 4 3 UNATTENDED PROFILES USING THE CONTINUOUS ACQUISITION FUNCTION 35 4 3 1 Preliminary configuration 35 4 3 2 Field operations 35 4 3 3 Ending the unattended data acquisitions 36 4 4 UNATTENDED PROFILES USING THE CONDITIONAL ACQUISITION 36 4 4 1 Preliminary configuration 36 4 4 2 Field operations 37 4 4 3 Ending the unatten...

Page 7: ...echnical support Website download area for software updates and technical support http www idronaut it download Warranty The OCEAN SEVEN 304Plus CTD is covered by a one year limited warranty that extends to all parts and labour and covers any malfunction that is due to poor workmanship or due to errors in the manufacturing process The warranty does not cover shortcomings that are due to the design...

Page 8: ...sopropyl alcohol or a solution of 1 4 cup bleach to 1 gallon tap water are suitable for most disinfecting Instruments used with wastewater may be disinfected with 5 Lysol if this is more convenient to the user The user shall take normal precautions to prevent radioactive contamination and must use appropriate decontamination procedures should exposure occur If exposure has occurred the customer mu...

Page 9: ...whole titanium and can be deployed to depths of 1000m 2000m 4000m or 7000m respectively 1 1 SAMPLING MODES User selectable sampling operating modes include Continuous Data is sampled at configurable sampling rates starting from 0 1 Hz to 6 Hz Sampling continues until interrupted Multiple cycles can be possible by switching the CTD ON and OFF Pressure Data is sampled at regular pressure intervals M...

Page 10: ...ct connection between the CTD and a personal computer by means of the six pole male connector located on the top end cap of the CTD RS232 cable up to 200m long can be prepared upon request Two different connectors cable combinations are possible depending on the type of the CTD housing The below pictures and wiring diagrams show both standard laboratory cables ...

Page 11: ...ge of the adapter is specified in 100m although line of sight ranges of 300m can be achieved However if a class 2 Bluetooth device is used to communicate with the CTD then the range will be limited to 10 20m as foreseen by class 2 devices The CTD Bluetooth interface allows instant wireless connectivity to any device supporting a compatible Bluetooth SPP protocol The connection with the CTD among t...

Page 12: ...wo plastic battery holders for the single Lithium or the double Alkaline batteries IDRONAUT does not include the batteries in the CTD shipment 2 x size AA Alkaline 1 5V battery assembled in a single pack 3 0V 1 x size AA Lithium non rechargeable battery 3 6V 2 4Ah 1 x size C Lithium non rechargeable battery 3 6V 8 4Ah 1 x size D Lithium non rechargeable battery 3 6V 19Ah NiMH IDRONAUT rechargeable...

Page 13: ...ing system It allows acquiring and displaying data in real time storing it for later retrieval and processing using REDAS 5 program While acquiring up to six different parameters are numerically shown on screen REDAS 5 Real time data acquisition processing and presentation programme which allows the numerical display and plotting of the standard sensors and the derived variables such as salinity s...

Page 14: ...0 2 Probe Access Rights The OCEAN SEVEN 304Plus configurations and functions are password protected to avoid unwanted modifications or running of functions that can led to CTD unpredictable behaviours In the CTD Service Menu it is present a command Rights which allows the operator to modify the CTD access rights Three different access rights are foreseen USR User access to perform daily operations...

Page 15: ...ing is completed automatically and the CTD operations control returns to the operator interface software module CTRL T Switches the CTD immediately from verbose to non verbose operating mode BACKSPACE Allows the operator to delete previously entered characters CTRL J Special character used to terminate the PTP protocol messages ENTER Confirms the modified numerical parameters 1 10 7 Field upgradea...

Page 16: ...ONS The fundamental properties of seawater like Salinity Sound Speed Water Density Oxygen ppm and pressure to depth conversion are obtained using the algorithms described in the UNESCO technical papers in marine science no 44 Algorithms for computation of fundamental properties of sea water The freshwater properties like TDS Total Dissolved Solids Fresh Water Conductivity corrected at 20 C and 25 ...

Page 17: ...acy Resolution Time Constant Pressure 0 7000 dbar 0 01 F S 0 002 F S 50 ms Oxygen 0 50 pm 0 1 ppm 0 01 ppm 3s 0 500 sat 1 sat 0 1 sat 3s Turbidity Meter 0 03 750 FTU NTU 5 FTU NTU 0 5 FTU NTU 0 1 s 0 03 500 FTU NTU 1 FTU NTU 0 1 FTU NTU 0 1 s 0 03 125 FTU NTU 0 25 FTU NTU 0 025 FTU NTU 0 1 s 0 03 25 FTU NTU 0 05 FTU NTU 0 005 FTU NTU 0 1 s from nitrogen to air A detailed description of the optiona...

Page 18: ...s filled with silicone oil and provided with a rubber bellow to achieve pressure compensation The IDRONAUT conductivity sensor and its associated electronics are designed to work both with plain and black platinised platinum electrodes These electrodes have the advantage that they can be used in both clean and dirty water without the fear of contamination Should electrode contamination occur they ...

Page 19: ... 6V 1 16 PHYSICAL CHARACTERISTICS Standard versions 1000 dbar 2000 dbar 2000 dbar 7000 dbar Dimensions Housing diameter 43 mm 75 mm 48 mm 48 mm Total length with hanging rod 562 mm 580 mm 560 mm 595 mm Weight In air 1 2 kg 2 2 kg 1 5 kg 1 85 kg In water 0 65 kg 0 5 kg 0 8 kg 1 15kg Material AISI316 POM POM Titanium POM Titanium Special AUV versions 1000 dbar 7000 dbar Dimensions Housing diameter 4...

Page 20: ...SECTION ONE SYSTEM DESCRIPTION IDRONAUT Brugherio MB OCEAN SEVEN 304Plus CTD 12 2015 12 OCEAN SEVEN 304Plus MI 4000 dbar COMPOSITE TITANIUM POM HOUSING ...

Page 21: ...YSTEM DESCRIPTION IDRONAUT Brugherio MB OCEAN SEVEN 304Plus CTD 12 2015 13 OCEAN SEVEN 304Plus 1000 dbar AISI316 POM HOUSING Note A Titanium gr 2 housing is also available rated to 7000 dbar whose diameter is 48 mm ...

Page 22: ...SECTION ONE SYSTEM DESCRIPTION IDRONAUT Brugherio MB OCEAN SEVEN 304Plus CTD 12 2015 14 OCEAN SEVEN 304Plus 2000 dbar Titanium POM HOUSING ...

Page 23: ...to communicate with the Ocean Seven 304Plus through a simulated communication port The simulated communication port is used by ITERM and other IDRONAUT programs to communicate with the CTD 2 3 HOW TO OPERATE THE CTD The CTD can be operated through the IDRONAUT Terminal Emulation software per Windows for brevity s sake hereafter referred to as ITERM The ITERM software is described in a dedicated ap...

Page 24: ...de is active type VT LF to reactivate the verbose operating mode When the CTD is turned on it keeps the operating mode of the last ON period So in case the CTD is turned off in the non verbose operating mode no menu will appear on the screen In that case the command VT LF must be typed in order to return to the verbose operating mode 2 5 THE MAIN MENU When the initialization process is completed t...

Page 25: ...ID 304 0010101 ADM 9 0_00 02 2012 14 35 25 24 11 07 2012 Acquire 0 MainMenu 1 RealTime 2 Linear 3 Timed 4 Continuous 5 Conditional 6 Burst cmd 3 2 1 Real Time This command allows the operator to see data acquired by the CTD in real time Data acquisition can be interrupted at any time by means of the CTRL C character Once running the following message appears on the screen Acquisition Type any char...

Page 26: ...inear cycle OCEAN SEVEN 304Plus ID 304 0010101 USR 9 0_00 02 2012 15 20 44 01 11 07 2012 Work Mem Cnf oK Calb oK Stat oK WakeUp 9F Data memory 1 GByte WarmUp Battery 3 60 VDC CTD Ok Analogue Ok OperatingMode Pressure PressureProfile OpenLOG 1 oK Acquisition C Stop Press Temp Cond Sal 0 19 25 4894 1 3770 1 2340 15 20 47 35 0 20 25 4902 1 3770 1 2340 15 20 47 61 0 20 25 4903 1 3770 1 2340 15 20 47 8...

Page 27: ... GByte WarmUp Battery 3 60 VDC CTD Ok Analogue Ok OperatingMode Timed TimeAcquisitionAcquisition C Stop Press Temp Cond Sal 0 28 25 7565 1 3629 1 2340 15 37 41 02M 0 28 25 7562 1 3629 1 2340 15 37 41 29M 0 28 25 7558 1 3628 1 2340 15 37 41 56M 0 28 25 7555 1 3628 1 2340 15 37 41 83M 0 28 25 7551 1 3628 1 2340 15 37 42 12M Timed Acquisition cycles left 7 NextACQTime 15 38 37 14 11 07 2012 OS304Plus...

Page 28: ... data acquisition cycle is interrupted upon receipt of the Stop Acquisition CTRL C Conditional sampling cycles can be performed by acting on the CTD ON OFF switch An example of CTD configuration message follows OCEAN SEVEN 304Plus ID 304 0010101 USR 9 0_00 02 2012 16 19 16 45 11 07 2012 Conditional Sampling Monitoring timeout 00 00 30 hh mm ss Sensor to monitor 0 Pressure 1 Temperature 2 Conductiv...

Page 29: ... in single burst 250ms 60000ms 250 First acquisition time 00 00 00 hh mm ss Do you confirm the above setup 1 Yes 0 No Confirm 0 1 OpenLOG 5 oK BurstAcquisition HF Acquisition C Stop Press Temp Cond Sal 0 34 26 5440 1 3686 1 2340 16 44 06 37M Burst cycles left 4 NextACQTime 16 44 35 39 11 07 2012 OS304Plus Shutdown The burst data acquisition configuration parameters are described in section 4 OCEAN...

Page 30: ...ration affects both newly acquired data and stored data Therefore before recalibrating a CTD sensor we strongly suggest uploading data from the CTD memory IDRONAUT suggests a complete check and CTD sensor re calibration once per year 3 3 1 Pressure sensor calibration To avoid that a minimum drift occurs in the pressure sensor it is preferable to immerse the CTD in water up to about 10 cm from the ...

Page 31: ... Temperature sensor calibration Enter coeff x a bx cx2 a 0 304912 b 0 0078532 c 0 1289741e 12 The operator can confirm or modify the above coefficients Typing an ENTER key confirms the shown coefficients while typing new values followed by an ENTER key modifies the previous coefficients a 0 304912 b 0 0078532 c 0 12897e 12 Once the last coefficient has been confirmed or modified the CTD shows the ...

Page 32: ... Solution Transfer some Copenhagen Water into a beaker and immerse the CTD into it The value for conductivity and temperature can be read from the Real time calculated data mode The conductivity value is supposed to be coincident or very close to the theoretical one 3 4 MEMORY MANAGEMENT This group of commands allows the operator to check query and show data stored in the CTD non volatile memory O...

Page 33: ...he associated data is not effectively deleted A deleted cast can be undeleted if needed using the same command Once invoked the list of stored cast is shown on the ITERM screen Id DataSet 1stSector N Sectors Acq Mode Acq Step Status Time 001 00000003 00000000 00000001 LINEAR 1 00 002 10 19 15 10 09 2012 Cast to delete undelete 0 1 3 4 5 Initialize Memory This command allows the operator to initial...

Page 34: ...bidity meter is installed and the automatic scale management is active this time out is spent when the measuring scale is switched to allow the Turbidity sensor stabilization Main com port BPS 0 9k6 1 19k2 2 38k4 3 57k6 4 115k2 2 CTD communication speed Default value is 38K4 In case this parameter is modified the ITERM program communication speed must be modified too The modification is applied at...

Page 35: ...ion Delete Allows the operator to delete a configured sensor parameter from the list Quit Terminates editing and ends the set up too The following parameters can be configured by means of the Modify command Sensor code 0 24 255 NU Sensor mux 0 3 255 NU Sensor precision 0 6 The below table reports the value associated to the available sensors parameters Sensor Code Sensor Description Sensor Mux Sen...

Page 36: ...ed from the 16bit ADCoverter Optional sensors data acquisition in real time expressed in counts or in mV Data acquisition can be interrupted at any time by means of the CTRL C character Once running the following message appears on the screen Keyb Cmd C Quit T urbidity Scale 1 500 FTU Mux 0 Mux 1 Mux 2 Mux 3 Mux 4 Mux 5 Mux 6 Mux 7 0 0 714 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 714 2 0 0 0 1 0 0 0 0 0 0 0 ...

Page 37: ...rol None The ITERM programme help contains the description of the programme main functions OS304Plus preparation Connect the laboratory cable between the personal computer communication port and the OS304Plus and then switch on the OS304Plus As soon as you switch the OS304Plus on the start up messages must appear on the ITERM window Once the OS304Plus main menu appears select the Service Menu and ...

Page 38: ...ing speed and set up Note The ITERM port configuration is the following Communication speed 9600 bps Data bit 8 Stop bit 1 Parity None Flow Control Xon Xoff The ITERM programme help contains the description of the programme main functions At higher baud rates even if possible it cannot be used to upgrade the OS304Plus CTD firmware Therefore modify the OS304Plus communication speed and set it to th...

Page 39: ...ort SPACE New Firmware Two commands are available CTRL C Aborts the firmware upgrading procedure and runs the previous firmware again SPACE Starts the firmware upgrading procedure 3 When the SPACE is typed a dot appears after the bracket immediately After few seconds a second dot appears at the same position 4 When this happens select the OceanSeven304Plus_xxx txt file using the TRANSFER SEND TEXT...

Page 40: ...rocedure starting from point 2 above Note This procedure cannot be interrupted or aborted after you ve run it you must complete it as described otherwise the OS304Plus device will not operate properly Please be sure that the OS304Plus power source is stable and never interrupted during the firmware upgrading Please be sure that the connected PC is well powered and do not run any other software dur...

Page 41: ...ll be used during the acquisition cycles to store data in memory Data Set per acquisition 50 3 Number of data set to store for each pressure interval Confirm 0 No 1 Yes Now the CTD switches OFF by itself and is ready to perform the data acquisition Disconnect the USB laboratory cable and rotate the magnetic rotary switch in OFF position 4 1 2 Field operations Once you have reached the sampling sit...

Page 42: ...time and adding the data acquisition step to the current date and time Otherwise the next acquisition time will be the configured first acquisition time Next Time 10 00 00 10 09 2005 At the end of configuration the CTD switches OFF by itself and waits for the next start up before starting to acquire data Confirm 0 No 1 Yes The operator must confirm the configuration before the unattended measureme...

Page 43: ...al computer using the USB laboratory cable and then switch ON the CTD The CTD main menu must appear Check and set up the RTC if needed Select the DATA ACQUISITION MENU and then select the CONTINUOUS DATA ACQUISITION Answer the following questions Continuous acquisitions Data acquisition scan rate 125ms 1 125 Data acquisition rate The parameter is configure in ms The minimum value is 125 ms and can...

Page 44: ...f needed Select the DATA ACQUISITION MENU and then select the CONDITIONAL DATA ACQUISITION Answer the following question Conditional Sampling Monitoring time out 5s to 1day 5 Monitoring time out used by the CTD to judge the value of the condition sensor The minimum configurable time out is 5 seconds the maximum is one day The CTD waits for the time between consecutive time outs in OFF condition th...

Page 45: ...rsonal computer using the USB laboratory cable and then switch ON the CTD The CTD starts to wake up and the start up messages appear Type the CTRL C key until the main menu appears The unattended conditional sampling cycle is ended and the CTD is working in the default mode waiting for the operator s commands 4 5 UNATTENDED BURST SAMPLING Burst sampling is useful when the CTD is used to monitor th...

Page 46: ...gative answer the CTD returns to the Main Menu Vice versa a positive answer causes the CTD to switch OFF by itself ready to perform the configured data acquisition cycle Note 1 Once started the data acquisition cycle can be interrupted at any time by rotating the magnetic switch arm to the OFF position The cycle will start again when the CTD is switched ON The new data acquisition time out is auto...

Page 47: ... OK button the REDAS 5 programme starts to upload all the selected casts automatically 4 7 UNATTENDED ACQUISITIONS IMPORTANT TIPS 4 7 1 Power consumption reduction The CTD is equipped with a firmware protection to prevent the battery pack from running down At the beginning of the unattended acquisition cycles and at preset intervals during the unattended acquisitions the battery energy is monitore...

Page 48: ...TION FOUR SELF RECORDING IDRONAUT Brugherio MB OCEAN SEVEN 304Plus CTD 12 2015 40 4 7 5 Probe autonomy A programme distributed with the ITERM software allows the user to calculate memory and power autonomy ...

Page 49: ... the following files ITERM EXE Terminal emulation program Iterm rtf ITERM programme documentation Read Only 5 2 INSTALLATION Before running the programme please create a new folder and name it as you like Then copy the ITERM EXE and the ITERM RTF programme in that new folder A shortcut on the desktop can be created using the Windows operating system resources 5 3 PROGRAMME MENUS AND FUNCTIONS The ...

Page 50: ...obe Identify It identifies the connected CTD information like the serial number the hardware and firmware release are shown on screen Probe Upgrade This function is not available on the OCEAN SEVEN 304Plus CTD Probe Set Time It sets up CTD time and date It is possible to select the time among GMT and local time or to customize the date and time Probe UploadCast This function allows the operator to...

Page 51: ...This function allows the operator to decide the type of font to use to show messages on the terminal window Aspect Colour This function allows the operator to select the foreground and background colours among a list of possible choices Transfer SendTextFile It allows the operator to transfer a text file to the CTD connected through the serial port Transfer CaptureToFile This function captures the...

Page 52: ...ss appears over the icon when running Pressing once stops the capture and closes the text file 5 5 START UP SWITCHES It is possible to customize the programme at the start up by adding the following switches to the programme properties p x Where x represents the communication port number 1 8 b bps Where bps represents the communication speed and can be 1200 2400 4800 9600 19200 38400 57600 115200 ...

Page 53: ...E IDRONAUT Brugherio MB OCEAN SEVEN 304Plus CTD 12 2015 45 5 6 2 OceanSevenCalibration This programme distributed with ITERM allows the operator to properly acquire and store data in a text file during the OS304Plus verification in a calibration laboratory ...

Page 54: ...RIES IN THE DOUBLE BATTERY HOLDER AND CONNECTING IT TO THE OS304Plus TOP COVER WILL CAUSE A PERMANENT DAMAGE OF THE OS304Plus CTD ELECTRONICS Optional USB Laboratory cable The status of the internal battery pack can be derived from the battery diagnostic reading of the CTD start up message This last is carried out only when the USB laboratory cable is not connected Therefore to update the battery ...

Page 55: ...ng 7 Lifting the CTD vertically helps to properly insert and mount the top cover 8 Check the correct position of the o ring and close the CTD with the four hexagonal screws Gradually tighten the four screws in sequence so as to close the cover uniformly 6 3 OPTIONAL RECHARGEABLE BATTERY PACK The internal custom NiMH rechargeable battery pack 3 6VDC 2 6Ah comes complete with the international batte...

Page 56: ...erly insert and mount the top cover 9 Check the correct position of the o ring and close the CTD with the three hexagonal screws Gradually tighten the three hexagonal screws in sequence so as to close the cover uniformly 6 5 OPTIONAL RECHARGEABLE BATTERY PACK The internal custom NiMH rechargeable battery pack 3 6VDC 2 6Ah comes complete with the international battery charger 6 5 1 Battery rechargi...

Page 57: ... battery that can be installed in the OS304Plus The forecast assumes that fully charged new batteries are used Type of battery Autonomy hours 2x1 5 Alkaline AA cell 30 1x3 6 Lithium AA cell 40 3x1 2 NiMH AA cell 48 1x3 6 Lithium C cell 160 1x3 6 Lithium D cell 330 6 7 RTC AND BATTERY The internal real time clock is kept by means of the CTD main battery pack Therefore when the battery pack is remov...

Page 58: ...ctly depend on the type of message Each incoming message must end with an LF that is the ASCII character line feed 0x0A hexadecimal 10 decimal Vice versa the Line Feed character on a PC keyboard can be obtained by pressing the CTRL J press and hold the CTRL key press and release the J key release the CTRL key The CTD operates in slave mode meaning that it does nothing but waits for user commands t...

Page 59: ...the anode and the cathode The membrane is shielded from accidental bumps by a protective ring The anode acts as a reference cell providing a constant potential with respect to the cathode The cathode where oxygen is consumed or reduced is separated from the sample to be analyzed by a thin layer of electrolyte and a special composite membrane The electrolyte permits the chemical reaction to occur w...

Page 60: ...rform daily profiling or monitoring Calibration frequency weekly Maintenance measuring membrane replacement electrolyte replacement A 3 DISSOLVED OXYGEN SENSOR MAINTENANCE FREE VERSION 5 bar only Type polarographic with Pt Ir cathode and Ag 99 99 anode Measurement range 0 50 ppm 0 500 sat Accuracy 0 1 ppm 1 sat Resolution 0 01 ppm 0 1 sat Polarization voltage 650 mV DC Response time 30 s membrane ...

Page 61: ...correction factors by the operator is a relatively straight forward procedure The oxygen sensor calibration and the correction coefficient calculation are both described at the Sensors Calibration section of this manual A 4 CALCULATIONS Calculation of the oxygen content in parts per million ppm is carried out in three steps A 4 1 Calculation of solubility The following constants are required for c...

Page 62: ...ete allows the operator to delete a configured sensor parameter from the list Quit terminates the data acquisition parameter editing and ends the configuration command too The new configuration is stored in a non volatile memory The following parameters can be configured by means of the Modify command Sensor code 0 24 255 NU 6 Sensor mux 0 3 255 NU 1 Sensor precision 0 6 1 A 6 CALIBRATION The oxyg...

Page 63: ...efficient Correction coeff for Barometric pressure and Stirring effect Coeff 1 05 The operator must confirm the default coefficient 1 05 or enter a different value see the below note the calibration continues with the confirmation of the Oxygen sensor DC OFFSET value This value is indicated in the document accompanying the CTD and should not be modified unless the sensor is changed DC OFFSET 56 NO...

Page 64: ... be touched during this check If the read out is higher there is most probably a film of moisture still in contact with the sensor tip Carefully dry the sensor tip Carefully fill the membrane cap with the O2 electrolyte do this in such a way that drops are deposited directly into the bottom of the membrane in order to prevent the formation of big air bubbles in the cap To eliminate trapped air bub...

Page 65: ...XYGEN SENSOR MAINTENANCE KIT Locate and pull out the following parts from the maintenance kit one oxygen measuring green membrane one o ring o ring mounting tool Remove the protection ring from the membrane cap Remove and discard the black o ring and the membrane s Fit the new o ring over the mounting tool and roll it down to the widest part of the tool Place the cap on a desk top with its narrow ...

Page 66: ... to reach the normal stability level of 0 1 to 0 3 ppm week A 7 6 Oxygen sensor check in the absence of oxygen To guarantee maximum accuracy in results it is a good practice to test the response of the sensor once a month in the absence of oxygen Nitrogen is recommended for this check should Nitrogen not be available an aqueous solution chemically reduced can be alternatively used To carry out thi...

Page 67: ...LINEAR CONTINUOUS CONDITIONAL B 2 SET UP OF THE UV LED ANTIFOULING STERILIZATION TIME Through the CTD set up it is possible to configure the UV LED antifouling sterilization time in seconds This time is spent by the probe during the wake up to sterilize the conductivity sensor The sterilization continues as it does not affect the conductivity measurements until the CTD switches off by itself and c...

Page 68: ...nsumption can be resumed as follows CTD at wake up sterilization UV ON 55 mAh 3 0V CTD running measurement UV ON 78 mAh 3 0V Considering a typical cycle of 5 seconds dedicated to the UV sterilization only 4 seconds to carry out the measurement and sterilization and 2 seconds spent during the wake up and shutdown functions it is possible to calculate the following battery endurance with a 3 6V C ty...

Page 69: ...y or accuracy of 0 025 Below these levels expression Precision is the ability of a pressure transmitter to be at each pressure point within 0 01 FS relative to these commercial standards C 2 2 Technical specifications Standard Pressure Ranges FS and Overpressure in Bar Available ranges 0 8 1 2 3 10 30 100 300 1000 Overpressure 2 5 20 60 200 400 1000 Output RS 485 Supply V 8 28 Vcc Accuracy Error B...

Page 70: ...roprocessor When the pressure transmitter is in service the microprocessor measures the signals S and T calculates the coefficients according to the temperature and produces the exact pressure value by solving the P S T equation Calculations and conversions are performed at least 400 times per second C 3 CONFIGURATION Through the CTD set up it is possible to configure the Highly Precise Sensor by ...

Page 71: ...ing formazine Turbidity Standard The user may also calibrate the sensor with particles of interest to measure their suspended concentrations The SEAPOINT Turbidity Meter is constructed from rugged corrosion free materials and quality surface mount electronic components for durability and high reliability D 1 1 Characteristics Range setting 25 125 500 750 FTU Output Time Constant 0 1 sec Sensing Di...

Page 72: ...ter has more than one measuring scale Answer 1 for yes in this case Do you want the automatic range 1 Yes 0 No In case the turbidity meter has multiple measuring scales it is possible to leave the CTD the responsibility to select the most appropriate measuring scale according to the sample under measurement Answering 1 for yes enables the automatic measuring range adaptation whereas answering 0 fo...

Page 73: ...ue for the preparation of such turbidity standards is discussed by Wilde and Gibs 1998 see note 1 Thus preparation of the calibration standards is a customer s responsibility From a technical point of view we suggest that at least a blank and two calibration standard solutions should be prepared for each measuring range 25 125 500 and greater than 750 FTU Furthermore we suggest that the calibratio...

Page 74: ...digit PIN code which identifies each IDRONAUT OCEAN SEVEN 304Plus CTD Features Fully Bluetooth Class 1 v1 1 SPP compliant Wireless range of over 100m 330ft Platform independent Access security guaranteed by means of a unique 8 digit PIN code Low power sleep mode when not in use Integrated antenna Power supply powered by CTD IDRONAUT Windows programs like REDAS 5 and ITERM flawlessly operate the OC...

Page 75: ...wing parameter Tx data at start up 0 No 1 Yes 1 The OS304Plus automatically acquires and transmits data after the start up Tx data AUV format 0 BLUEFIN 21 1 OEX C 1 Select the format of transmission see below Tx data Rate 0 1 8Hz 8 000000 Select the sampling rate or and data transmission rate F 3 BLUEFIN data format The OS304Plus acquires and transmits in real time Conductivity mS cm Temperature C...

Page 76: ...ctor please see the dedicated section A slack not well inserted or damaged cable end connector may cause the damaging of the bulkhead connector and malfunctioning of the OCEAN SEVEN 3xx CTD G 4 DUMMY PLUGS The purpose of the dummy plug is to protect the connector contacts from being in contact with water during the CTD immersion The dummy plug connector integrity is as important as the submersible...

Page 77: ...luggable connectors may be installed in wet conditions as their pins do not need to be dried before Anyhow they must not be mated while submerged Installation of cable end or dummy plug is simpler Proceed to align the female and male connectors looking at the connector s shape and insert them in a straight way Guidelines Lubricate mating surface with 3M Silicon Spray or equivalent DO NOT grease Co...

Page 78: ...il In this case do not use this water In case the CTD body or the sensors have any visible deposits of marine growths we recommend cleaning the CTD body with some liquid soap and a small soft brush to clean the sensor bulkheads between the sensors In case the OCEAN SEVEN 3xx sensors had been exposed to oil we suggest using the Triton X 100 solution at 1 2 in place of the liquid soap Alternatively ...

Page 79: ... is not in use it is kept dry Should cell contamination occur it can be easily cleaned even with up to 30 hydrochloric acid without affecting the conductivity cell performance or requiring re calibration To clean the conductivity cell use common cotton buds The cleaning can be done using the Idronaut Conductivity Sensor Cleaning Solution or a non ionic detergent like Triton X 100 At the end of cle...