CTD90M manual V5 11-11-2009
Contents
1. Relocate the mounting brackets to the middle of the box to supports both batteries as depicted in the next picture Reconnect the battery case with the probe electronics Now the probe is set on power and operating online red LED on Put the battery case back into the tube switch off the power with the magnetic rod Fix the top cap on the tube with 4 screws M3 4 mm Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 48 51 Appendix CTD90M current meter and compass The Inductive Current Meter ISM2001 is a stand allone unit and connected to the CTD90M by a cable For descriptions of the current meter please refer to HSE manual ISM2001 C The picture shows the probe and the currentmeter assembled in the protection case Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 49 51 Definition of terms The instrument axes of current meter and compass connected to the CTD90M are defined by an orthogonal co ordinate system depicted in the diagram below Current meter disc top view The positive y axis is marked according to the ISW2001C manual The CTD90M allows the acquisition of the 4 analog signals Cvx Cvy x y components of the current vect2. ka CTD90M Probe Ei Manual and operating instructions Version 5 02 06 2009 Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 2 51 Contents 1 General description 2 Mechanical characteristics 2 1 Pressure tube 2 2 Probe base 2 3 Probe lid with battery box 2 4 Sensor protection cage 2 5 Dimensions and weights 3 Sensors 3 1 Pressure sensor 3 2 Ground runner 3 3 Temperature sensor 3 4 Conductivity cell 3 5 Oxygen sensor 3 6 pH and redox sensor 3 7 SEAPOINT Turbidity sensor 3 8 TURNER Cyclops7 fluorometer 3 9 Multirange sensors 4 Sensor replacement opening the probe 5 Probe electronics 6 Connector pin assignment power supply and interfaces 6 1 Internal batteries 6 2 External power supply 6 3 Operation with multicore cables 6 4 Configuration cable 6 5 Operation with single conductor cables 7 Operating the memory probe 7 1 Control elements 7 2 Operation modes 7 3 Time mode 7 4 Increment mode 7 5 Continious mode 7 6 FSK mode 7 7 RS232 online mode without valid configuration 7 8 Command mode Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 3 51 8 Service a
3. amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 6 51 Standard probe The base offers space for 9 sensors the pressure sensor is always mounted in the centre position For the remaining sensors there are 8 fits The sensors are inserted into these fits the M4 tapped holes situated between the fits are for fastening the sensor flange with M4 screws All sensors except the pressure sensor have identical flanges The pressure transducer is inserted to the base inside and held by a M18 1 nut against the pressure from outside A Y UNF28THD tapped hole is for connecting the base to a pressure gauge so that the pressure sensor can be calibrated when installed Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 7 51 Figure 1 CTP90M standard bottom 1 4 UNF 28THD connection to __ pressure gauge 44 2227 8 standard fits for H _ bottom mounted sensors CTP90M bottom with integrated currentmeter or transmissiometer fit for currentmeter _ _ or transmissiometer standard fits for 7 C T P 02 pH Red Turb Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST
4. standard version LEMOSA connector Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 11 51 2 4 Sensor protection cage A sensor protection cage made of 6 mm titanium rods with a diameter of 120 mm and a length of 220 mm is delivered with the standard version The protection cage protects the sensors on the water floor against shocks and ground contact and guarantees a fine water flow through the sensors The protection cage is fastened with a single screw at the lower end of the pressure pipe As option any other size can be supplied The version with integrated current meter is supplied with a big size protection cage of 780mm length and 220 mm diameter covering the complete probe 2 5 CTD90M dimensions and weights pressure tube material titanium grade 2 length 390 mm diameter 89 mm wall thickness 3mm depth capability 500 m bottom cap material titanium grade 2 diameter 89 mm thickness 30 mm top cap material titanium grade 2 diameter 89 mm thickness 30 mm protection cage material titanium grade 2 diameter 150 mm length 200 mm standard probe gross length 650mm total weigth 4 8 kg bouyancy 2 kg Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user
5. 5 Operation with single conductor cables The standard application of CTD probes is profiling performed via winches with slip rings and single conductor cables The CTD90M is then supplied by constant current the FSK signal is superimposed on the constant current as voltage modulation An interface between PC and winch probe produces the constant current and convertes the FSK signal from the probe into PC compatible RS232C data The maximum voltage of the current source depends on the cable resistance cable length The wiring is as follows Inline cable Signal coax cable Pin 1 current FSK signal inner wire Pin 3 current loop return shield The basic version has a constant current of about 100 mA this can be distinctly higher when external devices are connected The voltage drop between Pin 1 and Pin 3 is approximately 17 volt The FSK signal is a sinusoidal signal of approx 5Vss and modulated on the constant voltage level A logic LOW level is the equivalent to the low frequency a functional HIGH level is equivalent to the higher frequency Standard baudrate is 1200 FSK frequencies are 2400 and 4800 Hz The FSK signals runs synchronically with the data signals Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 33 51 The TxD signal on pin 2 of the probe connector is identical with the RS232 outp
6. CTD90M user s manual page 8 51 CTD90M probe with integrated current meter or transmissiometer The flange of the current meter and transmissiometer have a diameter of 40 mm and requires more space on the bottom than the standard sensors approximately 25 mm diameter It is not possible to mount the pressure transducer in the centre position Hence the pressure sensor get its own housing and is plugged in one of the five remaining standard fits The calibration connection thread for the pressure gauge then has the ISO size M8 1 25 mm The printed circuit boards PCB are screwed on a bedplate made of 1 5 mm aluminium sheet which is mounted on the inside of bottom cap Lid and pressure tube are sealed by two O rings 76 2 5mm and are bolted onto the side with 4 screws M3 4 ith CTD LEMOSA bottom cap with C Sensors connector bedplate cable to battery pack digital board Anelog board pressure transducer bottom cap temperature sensor PE conductivity cell Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 9 51 2 3 Probe lid The lid has the same dimensions as the base and is also made of titanium Fastening and sealing are identical to that of the base Screwed into the lid is a supporting bolt with a loop for hanging it onto a shackle The standard version includes on
7. cap maximum 2 external instruments The standard CTD90M allows operation in different modes Time mode Increment mode Online FSK or RS232C Time mode is is the most important mode for long term measurements where the operator selects start and stop time and the measuring time interval Increment mode is mainly used during profiling and enables the user to carry out a great number of profiles without reading out the stored data files in between After configuration of start and stop depth and the measuring depth interval the probe will store one data set at each predestined depth In online mode the CTD90M runs on standard single conductor cables with constant current the measurement readings are transmitted as FSK signals modulated on the DC supply current This method of operation requires a specific probe interface which generates the constant current and convertes the FSK signals into PC compatible RS232 signals This mode of operation allows the releasing of multi water samplers and plancton multi nets and to recognize the status of these units number of bottles closed or number of net changes Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 5 51 For shorter distances several hundred metres a multicore cable can be used The probe is then supplied with constant voltage battery or DC pow
8. data transfer to the PC is via pin2 Transmit data TxD and pin3 GND The RxD input line of the probe must be connected to the PC in order to enable the data transfer memory probe PC Power supply inline cable Signal Signal connector Pin 2 TxD RxD Pin 2 SUB D 9 Pin 3 GND GND Pin 5 SUB D 9 Pin 5 RxD TxD Pin 3 SUB D 9 if external supply is provided Pin 3 Power GND Power GND banana plug black Pin 4 Power In Power out banana plug red The maximum length of the multicore cable data link depends mainly on the cable resistance and capacitance and can at best be several hundred meters An advantage is that a specific interface between probe and PC is not necessary 6 4 Configuration cable Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 32 51 It is delivered with the memory probe and is intended to be used for all kind of communication between probe and PC Configuration of the operation modes Data readout of stored files online transmission of data in laboratory The length of the configuration cable is about 5 m the wiring is described below memoryprobe PC serial port Power supply Pin2 TxD RxD Pin 2 9 pole SUB D Pin 5 RxD TxD Pin 3 9 pole SUB D Pin 3 GND GND Pin 5 9 pole Sub D Pin 3 Power GND Power GND Banana plug black Pin 4 Power in Power out Banana plug red 6
9. glass window for not more than a second The on Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 34 51 condition is displayed by the red LED A second activation turns the power off red LED off 7 2 Operation modes The probe has 3 configurable data storage modes time mode increment mode continuous mode and 2 on line modes FSK mode RS 232 on line mode The first 3 operation modes can be configured by the supplied Windows tm software package Sea amp Sun Technology s Standard Data Acquisition See separate manual for a complete software description Generally the memory probe has to be configured by use of this software prior to data storage applications Data readout and conversion to ASCII files is done by this software too In addition to storage modes the probe can be used like a standard direct reading probe using FSK or RS232 data tranmission During all data storage modes the measured data is transmitted via the RS232 output to a connected PC To save battery power the RS232 output is powered down if no valid RS232 voltage level is present at the RXD line of the probe 7 3 Time mode Time mode is configured by several parameters to best suit the data acquisition tasks of the application The most obvious is the time interval between two consecutive wake up periods T
10. is similar to the turbidity meter the limits are 90 and 10 of full scale The instrument has a six pin underwater plug Impulse AG306 and has to be connected by a cable to the CTD Specifications Power 8 20 VDC 15 mA average Signal 0 5 VDC each range Light source blue LED 470 nm Detector photodiode 680 nm Min detection level 0 02 ug l Depth capability 6000 m Size 64 mm diameter 168 mm length The instrument is also available in a version to measure DOC dissolved organic matter or yellow substances Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 26 51 4 Replacement of sensors opening the probe When replacing a sensor the probe generally doesn t have to be opened exception pressure sensor and Cyclops Proceed as follows remove the M4 screws which hold the flange carefully remove the respective sensor whilst gently turning it out of its fitting in the base disconnect the plug contacts pull lightly Reassemble in opposite order To remove the pressure sensor the probe has to be opened This is done in the following order remove the protection case take the lid off first of all unscrew the 4M3 screws on the side of the tube end and then pull the lid off whilst gently turning it without tilting it detach the base from the tube as with the l
11. next file is created in the memory If a stop depth was defined the probe will automatically switch off at that depth and close the current data file Otherwise the probe has to be switched off manually when it is raised to the surface and switched on again for the next profile and data file 7 5 Continuous mode At this mode all acquired datasets are stored in the internal memory of the probe Each time the probe is turned on by use of the magnetic rod a new additional file is created in the probe and all further datasets are stored until the probe is switched off again 7 6 FSK mode Connecting the memory probe to an Interface for single conductor cables enables the memory probe to enter FSK mode In this mode all data storage operations are disabled The probe turns on automatically when it is powered by the Interface and finishes the FSK mode after power down The probe acts like a true direct reading probe i e all previous storage configurations are terminated and have to be activated later on by connecting the probe to the PC software This mode is the only mode where the probe cannot be switched off by the magnetic rod Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 36 51 7 7 RS 232 on line mode is an operation mode without valid configuration The memory probe enters this mode aft
12. oxygen sensor AMT also available with standard flange H2S sensor AMT also available with standard flange methane sensor CAPSUM can be attached and operated as external sensors Power for external sensors has to be supplied by the CTD90M Standard supply voltage is 12 volt supply up to 26 VDC is possible 3 1 Pressure transducer A piezo resistive full bridge in OEM version with a diameter of 15 mm anda total height of 6 mm is used as pressure transducer produced by the Swiss manufacturer KELLER The casing and diaphragm are made of alloy C276 The transducer is delivered with a small SMD PCB and includes a temperature compensation of the pressure measurement The sensor is mounted in the base of the probe the SMD board has contacts and is plugged onto the main board of the probe Pressure transducer Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 14 51 Technical characteristics Manufacturer KELLER Switzerland Model PA7 XXX Progress XXX full scale range in bar Dimensions 15 mm diameter 5 6 mm height Full scale range 1 2 5 10 20 50 100 200 bar Bursting pressure 150 of FS range Repeatability 0 1 of FS range Hysteresis 0 1 of FS range Zero drift 0 01 C reduced to 0 1 FS by Progress Precision 0 1 in the range of 5 35 C 3 2 Ground
13. runner The function of the ground runner is to recognize the sea floor in time during profiling online It helps avoiding damage to the sensors through ground contact The ground runner mainly consists of a mobile magnet and a reed contact which are held together by spring tension During a profile the magnet is pressed against the spring tension by a control weight on a line and so kept away from the reed contact the contact is open If the control weight has floor contact the spring release the tension and presses the magnet to the reed contact which is then closed by the magnetic field The reed contact produces a digital signal which is interrogated by the micro controller 3 3 Temperature sensor The temperature sensor is a platinum resistor Pt100 in a tiny ceramic carrier of 15 mm length and 0 9 mm diameter It is fitted in a slender titanium tube 1 2 0 1 mm about 30 mm long This delicate tip is resistant to a pressure of 600 bar but it is extremely sensitive to knocks and inflection Therefore the tip is Surrounded by a titanium perforated shield tube which is mounted onto the standard flange The platinum resistor is connected in 4 wire technique Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 15 51 Technical data Manufacturer SST Type Merz Pt 100 1509 Measuring range 2 C 3
14. the light sensors must be mounted on the top of the probe to avoid shade of neighboured instruments Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 24 51 The dynamic measuring range sensitivity of the photodiode covers approxi mately 7 to 8 decades of light intensity Logarithmic amplifiers have a different resolution depending on the current value To avoid this disadvantage the complete range is divided into 4 decades each with 14 bit resolution range range code current uA PPFFR PPFD 0 0 0 0 0 05 Ones 12 1 1 0 0 0 5 0 125 2 0 1 0 5 0 1250 3 1 1 0 50 0 12500 calculated for Ll multiplier of 250 The result is a linear response from 0 001 up to 10000 umol s m Range switching is executed automatically when the measuring value increases the 95 full scale level or decreases 5 FS of the current range 3 9 3 Seapoint Fluorometer measures chlorophyll A concentration in 4 different ranges which are selec ted by two control lines A and B range range code B A Concentration ug L 0 0 0 0 150 1 1 0 0 50 2 0 1 0 15 3 1 1 Dessau 5 Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 25 51 The range switching procedure
15. 1 3 6 2 Depth range 0 500 m pH and redox combined electrodes based on the same principles as described in 83 6 1 but more pressure resistant Technical data pH Redox Manufacturer Hamilton Hamilton Model Polylite PRO 120 XP Polylite RX 120 XP Maximum depth 500m 500m Other technical data same as above see picture next page Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 19 51 aca 3 6 3 Depth range 1200m This pH ORP Sensor uses a pressure balanced glass electrode with a reference to provide in situ measurements up to 1200m depth The sensor is equipped with a reference system using a solid gel stiff polymer mass containing Ag free KCl and a ceramic pore diaphragm and with a pressure stable pH sensitive glassy electrode The pH probe is permanently sealed and supplied with a soaker bottle attachment The bottle contents must be 3 M KCI solution pH 4 that prevents the reference electrode from drying out during storage This sensor is absolutely H2S resistant PH Redox Manufacturer AMT GmbH AMT GmbH Measuring range 4 10 2000mV 2000 mV Maximum depth 1200m 1200 m Shaft diameter 12 mm 12mm Shaft material transparent plastic transparent plastic Bulkhead material Stainless steel stainless steel Thread G1 4 ISO228 G1 4 ISO228 Shaft length 84mm 84mm Length with fla
16. 4A titanium on request which is screwed into a flange The electrical contact is made by a socket in the flange Sealing between sensor and flange is achieved by an O ring which is part of the sensor After the sensor s life span has ended the sensor has to be replaced 8 8 Seapoint turbidity meter The turbidity sensor has to be cleaned from time to time Especially the optical sensitive flat surfaces have always to be kept clean Avoid the use of chemical solvents 8 9 Cyclops7 Fluorometer The Chlorophyll A sensor has to be cleaned from time to time Especially the optical sensitive flat surface has always to be kept clean Avoid the use of chemical solvents Make use of the protection cap if the sensor is not in operation Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 43 51 9 Probe data format The probe data can be fed into the PC serial ports COM1 to COM4 The standard settings of the probe are Baud rate 1200 2400 4800 9600 Character length 8 Number of stop bits 1 Parity odd Protocol non asynchronous Signals GND TxD The data is transmitted as binary data 3 bytes 24 bit per sensor are required 16 bits are measuring values 5 bits are address and 3 are status bits The transmission format is presented in the following chart Sensor LSB MSB 1 Byte H DO Di D2 D3 D4
17. 5 C Response time approx 150 msec Repeatability lt 0 001 C Accuracy 0 005 C Maximum depth 6000 m 3 4 Conductivity cell Short description of measuring principle All models of conductivity sensors use 7 electrodes in a cylindrical arrange ment The cell is always constructed symmetrically as depicted in the following sectional drawing A BG D EF 6 The central electrode D is used to impress alternating current of 500 Hz to 1 kHz frequency square wave into the water volume while both outside electrodes A and G are the current return leads which are held on a constant potential There exist two pairs of sensing electrodes B C and E F which measure the voltage drop across them The electrical field in a homogeneous medium is symmetrically divided on both half cells The constant potential on the outer electrodes limits the electrical field to the inside of the cylinder and prevents any influence from boundary conditions outside the cell The conductivity electronic is mainly an automatic closed AC control loop which hold the voltage drop across the sensing electrodes on a constant level while the current is proportional to the actual conductivity value Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 16 51 Conductivity sensor for profiling The conductivity cell consists of a quartz gla
18. Clark electrode self galvanizing Polarisation voltage 0 7 VDC Range 0 150 Oxygen current 0 12nA Temperature range 2 C 30 C Response time approx 10 sec 98 Accuracy 3 Maximum depth 2000 m Oxygen sensor without protection cap Oxygen sensor with protection cap Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 18 51 3 6 pH and Redox sensors 3 6 1 Depth range 0 160m pH and redox combined electrodes are industrial sensors using a solid reference system stiff polymer mass containing KCl and an aperture diaphragm which allows direct contact between reference electrolyte and sample medium Regeneration of the glass membrane or filling up electrolyte is not possible When the lifetime of the sensor is over it has to be replaced by a new one The sensor has a thread PG 13 5 and is screwed into a flange A coaxial socket makes the electrical contact in the flange Sealing between sensor and flange is achieved by an O ring which is part of the sensor Technical data pH Redox Manufacturer METTLER TOLEDO METTLER TOLEDO Model 405 DXK S8 120 Pt 4805 DXK S8 120 Measuring range 4 10 2000mV 2000 mV Maximum depth 160m 160 m Shaft diameter 12 mm 12 mm Length with flange 167 mm 167 mm Response time approx 1 sec approx 1 sec 1827 SOv OL ON J8ploO VOI oO ti zHd 00310
19. D5 D6 2 Byte H D7 D8 D9 D10 Di1 D12 D13 3 Byte L Di4 D15 AO Ai A2 AS A4 DO D15 16 bit binary data decimal value 0 65535 AO A4 5 bit binary address decimal sensor address 0 31 H H L 3 status bits 1 1 0 A sensor data transmission starts with the 1 Byte LSB first and ends with the third byte MSB last Every sensor in the probe has a specifically assigned binary address which identifies the kind of sensor The status bits are useful for the PC data acquisition programmes to compile the 3 bytes in the correct sequence A complete data set begins with the lowest address and ends with the highest address All addresses between 0 and 31 may occur The transmitted physical addresses are identified by the data acquisition program and compared to those registered in the configuration file As an example the addresses for the CTD90M Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 44 51 Address 0 light transmission Address 1 battery voltage Address 2 pressure Address 3 temperature Address 4 conductivity Address 5 oxygen Address 6 pH Address 7 redox The remaining vacant addresses can be used for external probes or sensors Multirange sensors A multirange sensor with databits D15 D0 carries the range information in the least significant two bits D1 DO range DO D1 The true
20. HA405 DXK S8 1 20 Redox sensor 160m METTLER TOLEDO Pt4805 DXK S8 120 PH sensor 500m HAMILTON Polylite PRO 120 XP ORP sensor 500m HAMILTON Polylite RX 120 XP PH and ORP 1200m on request Pressure sensor KELLER PA7 XXX Progress 0 1 2 Volt XXX Full scale range in bar O rings Base and lid 76 2 5 mm Sensors flange 16 1 5 mm pressure sensor 13 1 mm stainless Steel 316L 12 1 5 mm alloy C276 PH Redox sensor 12 1 5 mm 160m 500m Underwater connector 12 42 1 78 mm Plugs and cables Dummy cap SUBCONN MCDC4F DC4F Locking sleeve SUBCONN MCDLS F DLSA Inline connector SUBCONN MCIL4F IL4F Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 47 51 Appendix Battery pack for D cells This battery pack was designed to operate third party instruments with high supply current consumption The main feature is an extended operation time due to the greater capacity of the D cells 16 20Ah depending on type and manufacturer Inserting of the batteries Unscrew the 4 fastening screws of the top cap of the probe Remove carefully the top cap with the battery case out of the tube and unplug the electrical connection Displace the mounting supports of the batteries as shown in the picture and set the 4 upper batteries into the case Insert the batteries in the correct polarity
21. ard 3 9 2 LI COR Quantum sensor is used for measuring Photo synthetically Active Radiation PAR in aquatic environments Due to its 400 700 nm quantum response it is a suitable sensor for investigation of the primary production LICOR offers two different underwater sensors LI 192SA cosine corrected quantum sensor following Lambert s cosine law measures the Photosynthetic Photon Flux Density PPFD through a plane surface photon or quantum irradiance between 400 and 700 nm Li Cor sensor type 192 SA UWQ no 6478 cross section Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 23 51 LI 193SA spherical quantum sensor determines specifically the Photosynthetic Photon Flux Fluence Rate PPFFR the number of photons in the visible range incident per unit time on the surface of a sheer divided by its cross sectional area Li Cor sensor type 193 SA SPQA no 2459 Both instruments are calibrated in umol s m uE where 1 umol is 6 023 10 photons Specification Detector silicon photodiode Range 0 10000 umol s m Calibration accuracy 5 Linearity 1 Long term stability 2 per year depth capability 350 m LI 193SA 550 m LI 192SA Sensitivity typical 3 uA 1000uE Both sensors will be connected to the probe by a 2 wire underwater cable Please note
22. ax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 37 51 8 Service and maintenance The best maintenance for the probe is to handle it with care Despite the fact that the probe is sturdily and stabile designed unnecessary strains like knocking and shocks should be avoided Apart from that there are only few instructions and maintenance rules which should be heeded or met to so as to ensure a longer life span and correct measuring results 8 1 The underwater connector Is actually maintenance free However it has proved itself to be advisable to lubricate the sealing surfaces of the pins with sea waterproof grease This reduces wear whilst plugging and unplugging Further tips clean the plugs with warm soapy water They do not have to be dried Chemicals should be avoided To avoid corrosion never plug or unplug whilst under water To conserve the cable plug never unplug by pulling on the cable Avoid bending radiuses and above all narrow sharp kins Plugs that are not in use should never be left blank They should always be protected against corrosion by a dummy cap 8 2 Pressure sensor The pressure sensor doesn t require special attendance or maintenance Personally experience has shown however that the pressure sensors should never be tested by pressing a pin onto the membrane This often causes damage of the membrane or dents it which can lead to pressure reading mistakes or to a tota
23. e underwater bulkhead connector SUBCONN MCBH5M which is used for communication configuration and data readout and external power supply and one operating control device The control device consists of a two colour LED for the display of operation conditions and messages and a magnetic switch reed contact to turn on and off the instrument The Duo LED is located behind a pressure resistant glass window the position of the reed contact is marked by a small borehole in the top cap surface configuration connector MCBH5M suspension bolt Position of reed contact glass window with DUO LED The battery box is fixed directly on the inside of the top cap A circular printed circuit board is mounted between lid and battery box It contains the the cabel driver circuitry and FSK modulator and all the necessary wiring of connectors control device and battery pack The connection to the probe electronics is established by a separable 10 wire cable connection Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 10 51 Top cap with battery box suspension bolt control device ED edd contaci configuration connector top cap protection ring inside PCB cable driver amp FSK modulator battery box batteries 8 C size battery box top cover cables to digital board battery pack
24. eceiver Flash memory Power supply and regulation 5V 5V 3 3V Power switch for external devices 5 4 Expansion board The expansion board is equipped with a second 8 channel analogue multiplexer for the upper address range from 16 to 23 This board provides the plug in position for all multirange sensor electronics and the interface circuitry for current meter and compass Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 29 51 6 Connector pin assignment power supply and interfaces The CTD90M has a 5 pin underwater connector which allows the probe to be operated in different modes The standard connector is SUBCONN MCBH5M made of titanium and neoprene Face view of bulkhead underwater connector Connector pin assignment Pin 1 Constant current loop FSK Signal option Pin2 TxD transmit data RS232C Pin 3 Constant current loop return Power GND RS232 GND Pin 4 Power input 10 15 Volt Pin5 RxD receive data RS232C Mating cable is Subconn MCIL5F with locking sleeve MCDLSF 6 1 Internal batteries 6 1 1 12V Battery The battery box is a circular shaped housing of 75 mm diameter and approximately 140 mm height and mounted on the top cap of the memory probe The box is designed for 8 alkaline batteries of size C The batteries are packed in series which guaranties a supply vo
25. edance electrolytic connection between medium sea water and electrolyte room behind the membrane This connection is necessary for proper measurements Please take care that during measurements the O ring takes always the backward position The Oxyguard DO sensor is supplied by us with a sensor protection cap made of plastic To achieve a tight fit to the sensor head the cap is equipped with an O ring 21 1 mm and a 2mm hole in the center of the bottom see photo The cap should be used as protection for the membrane and sensor head as well as useful tool for oxygen field calibration If the membrane tension is dropping during operation or time the sensors output signal is changing too The zero point of the oxygen sensor remains fix during its lifetime but the sensivity slope can vary The user can execute a field calibration after each membrane exchange or when he doesn t trust the measured values anymore Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 40 51 Field calibration The SDA software offers the possibility to perform a field calibration and to change the reading automatically Let the SDA program run with the probe connected to the PC The field calibration procedure is very simple Keep the membrane of the DO sensor dry Put the red o ring in the backward position plug the pr
26. ell within a short time 2 weeks In this case the cell has to be placed into diluted acid if necessary for a longer time and then a plastic bottlebrush has to be pushed through it This procedure may have to be repeated until the cell is completely cleaned Then the cell is rinsed with fresh water Particular care has to be taken that the metal components on the electrode surfaces are not scratched nor must they come into contact with other metals Otherwise the lifetime of the cell and the long time stability of the conductivity measurements will be impaired After the electrodes have been treated with acid a short term increased conductivity reading may occur this should normalize itself within an hour 8 5 Oxygen sensor The oxygen sensor requires some attention from time to time All the necessary maintenance like exchange of electrolyte and membrane is described in an OxyGuard leaflet in the appendix of this manual The red O ring has two different positions 1 in the front position shown in the picture below the O ring prevents leakage of the electrolyte through the thread during storage This position should not be used for measurements but only for storage Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 39 51 2 in the backward position it allows the electrolyte to build a high imp
27. er supply The PC received data directly from the probe as RS232C signal A specific interface is not required by this mode of operation The CTD90M is equipped with a 16 channel data aquisition system with 16 bit resolution A high long time stability and automatic self calibration of the 20 bit analogue digital converter guarantees stable and precise CTD measurements for many years 2 Mechanical characteristics All parts of the probe which are exposed to seawater are made of corrosion proof metals or plastics Essentially the probe consists of the following mechanical structural components Housing Pressure tube Probe base Probe lid Sensor protection cage Sensors The sensors are described in a separate chapter The underwater housing consists of a cylindrical tube closed on both ends with caps and sealed with two O rings each 2 1 Pressure tube The pressure pipe is made of a solid drawn seamless titanium tube with an external diameter of 89 mm a wall thickness of 3 mm and is able to withstand more than 500 m water depth There are 4 holes 6mm in 90 graduation 6mm away from both tube ends These holes are used for fixing both end caps of the housing to the pressure tube Pressure pipe and end caps are sealed by two O rings 76 2 5mm each 2 2 Probe base The probe base is made of solid titanium and is used for the attachment of nearly all sensors Fig 1 shows the principle arrangement of the sensor positions Sea
28. er power on under following conditions After each first Power On Battery exchange The stop time in time mode operation is reached FSK mode has been finished The internal data storage memory is full Further data storage is disabled by the PC software No data storage is possible the probe awaits another configuration and acts like a direct reading probe after being switched on by the magnetic rod Power is derived from the internal battery or external power supply The probe can opperate in this mode for unlimited time until it is switched off by the magnetic rod 7 8 Command mode When the PC software is urged to Start communication with the memory probe then it switches the probe into the command mode to start configuration or readout data During command mode no data is acquired and any data storage in progress is temporarily disabled and will be resumed after end of command mode if wanted If time mode is active during command mode the time grid updates are done in background but no data acquisition is performed Time mode will resume after leaving the command mode and start at the next configured interval in the future During data readout the communication baudrate is automatically set to 115200 Baud to speed up the process Command mode is left by closing the configuration window of the PC software Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 F
29. he second is the length of time the probe is switched on after wake up There is a Start time where the first interval starts and an optional Stop time after that the probe will terminate the time mode During the OnTime either all datasets are stored or only those at a defined time grid The parameters for Start Time and Interval are mandatory all others are optional for convenience Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 35 51 7 4 Increment mode Mostly this mode is used to obtain depth profiles with datasets stored at user defined depth levels in order to achieve appropriate data reduction The delta interval between two consecutive depth levels has to be entered Optionally a start depth and or a stop depth can be defined After crossing one of those depth levels one complete dataset is stored and the internal processor of the probe calculates the next depth level to be crossed Even if the same limit is crossed again later on no additional data is stored More than one profile can be obtained without the necessity for data readout to a PC in between A maximum of 250 files can be stored in this mode as long as the capacity of the internal solid state memory is not exhausted 64 MegaBytes For each profile the probe has to be switched on by use of the magnetic rod At that moment the
30. id disconnect all of the sensor plugs unsolder the pressure sensor cable on the main board detach the bedplate from the base unscrew the pressure sensor holding screw pull the sensor out carefully by its cable from 100 m range upwards blow it out if necessary with compressed air from the front side Attention When replacing the pressure sensor the progress print must always be replaced as well because it contains the temperature compensation for the specific pressure sensor When inserting the new pressure sensor grease the O ring thoroughly Reassembling is done in the opposite sequence Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 27 51 5 Probe electronics The electronics of the basic version consists of 3 printed circuit boards Power supply and cable driver located between battery box and lid Analog main board and plug in modules Digital main board Expansion board eS 5 1 Probe power supply is situated on a small circular board 40 mm diameter which is screwed to the inside of the lid This board contains the FSK modulator the cable driver and the zenerdiode for constant current supply Components which produce a considerable heat are screwed onto the lid thus using the good thermal contact for heat abduction to the metal housing and seawater cable driver transisto
31. ie box with 8 D cells is available see appendix 6 1 2 3V Battery If there is no need to supply third party instruments with higher voltages than 5V a3 volt supply is more effective The length of the probe is 50mm shorter than the basic version Specifications Batteries 4 1 5 volt C cells Type alkaline Nominal capacity 7 8Ah IEC designation LR14 Size 26 52mm Power consumption 50 80mA for C T D O2 pH redox Lifetime approximately 250 hours continuous operation Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 31 51 6 2 External power supply The memoryprobe can be powered externally via cable connection to an external battery or a DC power supply regulated or unregulated The external supply voltage may range from 9 to 15volt The internal batteries need not to be removed they are polarity protected by a diode against higher voltage The memory probe is then supplied by the source with the higher voltage External Power Connection Pin3 Power GND Pin 4 Power In 9 15 VDC 6 3 Operation with multicore cables The use of multicore cables is adviseable for shorter distances between probe and PC and paricularily in a laboratory The probe is then supplied either by a battery or an external power supply The voltage is applied to Pin3 negative and Pin4 positive Online
32. l damage Pressure sensors damaged in such a way are not covered by the guarantee 8 3 The temperature sensor The temperature sensor is maintenance free Dirt and plant cover only prolong the time constant but have no effect on the precision When cleaning the sensor take special care of the sensitive tip which should not be bent Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 38 51 8 4 The conductivity cell Is principally not maintenance free It must regularly be inspected for plant cover and electrolytic calcification Both effects reduce the measured conductivity It is appropriate if the probe is rinsed on deck with fresh water after each application This prevents the formation of salt crystals on the cell surface Calcareous deposits which originate from the electrical current flow in the cell are easily removed if the cell is immersed for a few minutes in a diluted acid The quantity of rising COz2 bubbles gives information on the rate of calcification The cell is completely decalcified when the bubble formation has ceased Afterwards the cell has to be rinsed with fresh water Depending on the operating time this procedure is only necessary every few months Cleaning is more difficult after long time application especially during warm months when heavy sea pest growth densely populates the c
33. le analogue output The CTD90M supports these multirange sensors by automatic range switching and transmits measurement values and range information to the board unit in a single 16 bit word Analogue values have 16 bit resolution The range code consists of 2 bits and occupies the two least significant bit of the 16 bit measuring value This limits the real resolution of the multirange sensors to 14 bits But since all these sensors doesn t need CTD resolution the overall accuracy is not affected by this procedure 3 9 1 Seapoint turbidity meter Description is given in 3 7 Beside the hardwiring of the selected range the CTD90M offers the possibility of automatic range switching Both versions have 4 ranges which are controlled by two independent gain control lines A and B Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 22 51 range B A gain calibration range 0 0 0 1 0 2500 FTU linear up to 1000 FTU 1 1 0 5 0 500 FTU 2 0 1 20 0 125 FTU 3 1 1 100 0 25 FTU 0 line tied to GND 1 line left open The CTD electronic monitors the signal output of the turbidity sensor and selects automatically the next suitable range if a certain limit is exceeded or dropped The limits are approximately 10 resp 90 of the current range The instrument is factory calibrated with a formazine turbidity stand
34. ltage of 12 VDC 8 1 5 volt at full capacity of 7 8Ah All battery contacts are springs which are loaded and they assure a safe operation without power interuption even under stress and shock conditions and rough handling For exchange of batteries you have Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 30 51 to pull carefully the top cap off the pipe after having unscrewed before the four screws M8 at the tubes end Then separate the cable connection to the electronics and remove the cover of the battery box screw M6 Insert the new batteries in the correct sequence as depicted on the battery box housing Closing of the instrument is done in the opposite order Please take care that the O rings of the top cap are always lubricated with silicone grease Spare O rings are part of the delivery Specifications Batteries 8 1 5 volt C cells Type alkaline Nominal capacity 7 8Ah IEC designation LR14 Size 26 52 mm Power consumption 20mA for C T D O2 pH redox Lifetime approximately 300 hours continious operation The CTP90M is protected against low battery In memory mode data storage active the probe probe is switched off when the battery voltage falls below 9 5 VDC and can only be activated by connetion to a PC via RS232 communication For units with high current consumption a batter
35. nd maintenance information 8 1 Underwater connector 8 2 Pressure sensor 8 3 Temperature transducer 8 4 Conductivity cell 8 5 Oxygen sensor 8 6 pH Redox sensor 8 7 pH ORP sensor 8 8 Seapoint Turbidity Sensor 8 9 Cyclops7 Fluorometer 9 Probe data format 10 Calculation of the physical data 11 Spare parts and accessories 12 History of document Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 4 51 1 General description The CTD90M memory probe is a microprocessor controlled multiparameter probe for precise online measurements as well as for self contained operation in deep and shallow water Apart of the CTD sensors it is possible to interface a number of chemical physical and optical sensors and instruments The housing of the probe is pressure resistant up to 500m depth the maximum allowable operation depth depends on the sensors line up In spite of its relative big size the standard CTD has a weight of approximately 4 5kg due to the fact that it is completely made of titanium The housing is inert against nearly all chemical compounds except hydrofluoric acid and absolutely corrosion free The housing diameter of 89 mm allows a maximum of 9 sensors or external units to be connected to the bottom cap Additional sensors or instruments can be attached externally to the probes top
36. nge 117mm 117mm Response time approx 1 sec approx 1 sec wu d il kee a This sensor is pressure resistant up to several thousand meters depth with a slight increase of pH ORP values Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 20 51 3 7 Seapoint turbidity sensor The bottom mounted turbidity sensor is based on the SEAPOINT turbidity meter in the bulkhead version which is screwed onto a standard flange Electrical connection is achieved by a separable 6 pin round connector For further details please refer to SEAPOINT s manual The Turbidity sensor measures the concentration of suspended matter It is equipped with a pulsed infrared light transmitter and detects the scattered light from the particles suspended in water Transmitter and detector arrangement uses 90 scattering at a wavelength of 880 nm The output signal is proportional to the particle concentration in a very wide range For detailed description of Seapoint turbidity meter refer to the special user manual Specifications Power 7 20 VDC 3 5 mA average Signal 0 5 VDC each range Scatterance angle 90 avg 15 150 Light source wavelength 880 nm Linearity 2 Depth capability 6000 m Size 2 5 cm diameter 11 cm length Ranges 0 25 0 125 0 500 0 2500 FTU Picture shows the bulkhead versi
37. on with flange The turbidity sensor is available in two different versions standard version has an underwater plug is connected to the probe via a 6 wire cable and has to be fixed to the probes protection cage with a clamp The Bulkhead version is plugged into a fit of the bottom cap of the probe and hence needs no underwater connection cable The range can be selected by hardwiring according to the customers requirements Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 21 51 3 8 Cyclops7 Fluorometer The Cyclops 7 used here for MSS90 is the standard Cyclop 7 instrument from Turner Design In order to adapt the instrument to the probes end cap the Subconn connector was skipped and instead our standard flange was screwed into the connectors thread To avoid corrosion problems the cyclops7 housing is made of titanium The gain setting lines can be set to a range of 0 5 0 50 or 0 500ug l The selection of the gain is made inside the profiler by the use of two SIL switches The instrument is delivered with the default range 0 50ug I gain setting 10 For details and hints for application please refer to turner s user manual The manual is available on the CD ROM 3 9 Multirange sensors There are a number of sensors which have several measuring ranges with different sensitivities on a sing
38. or related to instrument axes Hx Hy DIR VDIR CDIR VCSP VCSP CDIR calibrated in m s x y components of the magnetic field intensities related to instrument axes calibrated in arbitrary units angle between positive y axis and North direction angle between positive y axis and current vector angle between North direction and current vector magnitude of current vector cvx cvy 12 VDIR DIR arctanCvx Cvy arctanHx Hy Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 50 51 Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 51 51 12 History of document Version 4 17 11 08 Appendix Corrosion protection for pressure transducer removed Inserting of battery case for D cells Version 5 02 06 2009 Appendix Currentmeter and compass revised edition Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com
39. otection cap onto the sensor head with a proper fitting o ring Fill a small plastic cup with water and immerse the sensor head up to the flange small white plastic cup is part of the delivery after a short time the enclosed air in the cap is water vapour saturated and the the oxygen reading should have 100 partial pressure lf the oxygen reading is stable click menu point Calibrate and 02 Field Calib When O2 Field Calib is selected the current oxygen reading is automatically stored The default value 100 is accepted when clicking on the button Calculate slope now The SDA programm calculates the new oxygen Field calibration coefficient originally 1 and the reading is now 100 The field calibration method works in any basin or tank and the result is independent of the salinity When putting the complete probe into a basin you have to estimate the immersion depth of the oxygen sensor measured from the membrane to water surface Every 10 cm immersion depth lead to an increase of the oxygen reading of 1 So e g if the procedure is executed with the DO sensor 30cm below the water surface the default value in the button field Enter desired value has to be changed to 103 8 6 pH and Redox sensor 160m 500m Both sensors are principally maintenance free After its life soan has ended the corresponding sensor has to be replaced When unscrewing the sensors no moisture e g water drops what so ever must reach the contacts d
40. r zenerdiode The wires of the probes underwater connector are soldered onto this board the connection to the main board is separable by a plug 5 2 The main board Measures 150 mm 50 mm and contains the following circuitry Data acquisition 16 channel analogue multiplexer RS 232 driver Water sampler releaser Temperature module Conductivity module Pressure amplifier with Progress print as plug in module Oxygen amplifier Redox amplifier PH amplifier Differential amplifier for sensors with analogue output The main board has an expansion plug which contains all necessary signals for a system extension to 32 sensors On the backside of the bedplate a further same sized additional printed circuit board can be attached which incorporates the electronics for further sensors Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 28 51 The heart of the probe is a microprocessor controlled 20 bit analogue digital converter which generates an auto calibration cycle each time the probe is switched on This results in an exceptionally good long term stability This is especially important for the stability and precision of the CTD sensors 5 3 Digital board Contains the following circuitry Processor in and out ports Toggle switch for reed contact RS232 driver and r
41. r to 8 7 Special care has to be taken that before using the sensor no air bubble is to be found in the pH electrolyte directly behind the ion permeable glass layer because it would interrupt the internal electrical connection to the pH electrode The air bubble has to be shaken out similar to the shaking of a thermometer The air bubble often occurs when the sensor has been stored horizontally for a longer time 8 7 pH ORP sensor 1200m H S resistant Do never touch the sensitive tip Protect the pH sensor with the delivered soaker bottle containing the storage solution and avoid any dry out of the sensitive tip Avoid any air inside the bottle fill completely with 3 M KCI Make sure that only 3 M KCI with pH 4 buffer is used for storage It is not allowed to use other wetting caps in order to avoid any air pressing into the diaphragm leading to sensor malfunctions or damage Damage because of using other wetting caps or storage without any wetting cap is not covered by guarantee The pH sensor has to be rinsed carefully with fresh water after finishing the measurements weap from bol moving electo Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 42 51 The pH sensor is a replacement part and has to be changed if the sensor has reached the lifetime The sensor has a stainless steel thread G1
42. resolution of a multirange sensor is therefore 14 bit but the sensor data is handled by the SDA program like any other 16 bit value The range information is used by the SDA software to load the correct calibration coefficients for the calculation of the engineering units Sea amp Sun Technology GmbH Arndtstra e 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 45 51 10 Calculation of the physical data Data transmission and data storage when online are performed solely in binary dates The PC data acquisition program carries out the calculation of the physical values from the raw data and their display The calculation of physical values for standard sensors is made by a polynomial of n th order Measurement value Ai ni Ai calibration coefficients i 0 4 Normally imax 1 OF imax 2 The coefficients are determined by calibration measurements against a normal or subnormal and subsequent regression calculations Further calculations such as the absolute oxygen concentration salinity density and sound velocity are carried out with the current UNESCO formulas Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 46 51 11 Spare parts 11 1 11 2 Sensors pH senor 160m METTLER TOLEDO
43. ry beforehand A single drop of saltwater is enough to cause long lasting incorrect measurements this is due to the high output impedance of 100 400 MQ So only replace sensors under clean and dry conditions please Please note screwing the Mettler Toledo pH or ORP into the socket of the flange must be executed very carefully in order not to damage the plastic thread of the sensor Tighten the sensor only by hand don t use a tool Damaged threads are not covered by warranty Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 41 51 The life span of the sensors ceases when the response time of the pH or redox measurement drastically increases The life span also ends when the reference electrolyte is dissolved down to the screw thread rim Water can then possibly leak in through the bolting Caution Do not expose these pH or ORP sensor to H2S The pH and Redox sensors are particularly endangered when they get into contact with HS in water Some minutes in water containing hydrogen sulphide is enough to irreparably ruin the sensor In most cases stable measuring results cannot be achieved anymore despite lengthy rinses with cleansing or buffer solutions If measurements in H2S concentrations are necessary we recommend to remove the sensors and to screw on locking caps or to use the 1200m sensor refe
44. s manual page 12 51 3 Sensors The CTD90M has a maximum of 16 analogue channels and 8 digital inputs or outputs for the connection of different sensors A maximum of 9 sensors fit onto the bottom The other sensors or instruments have to be connected externally via additional underwater plugs in the sensor lid The following sensors can be accommodated in the sensor base bottom mounted sensors without cable connection Pressure transducer Ground runner Temperature sensor Pt 100 Conductivity cell Oxygen sensor Ph and redox sensor Seapoint turbidity meter The standard sensors have the same flange with an integrated six pin glass feed through 400 bar equipped with a small six pin round connector see figure below All of these sensors can therefore be removed from the outside and can easily be replaced without having to open the probe standard sensor flange 2x O rings 16x1 5 rina 13x1 pin glass SER feedthrough LEMOSA 6pin connector Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 13 51 External sensors with analogue outputs and cable connection to the top cap of the CTD90M fluorometer Seapoint TRIOS Cyclops7 current meter hs engineers transmissiometer light sensors LI COR multi water samplers Hydro Bios multi plankton nets Hydro Bios fast
45. ss cylinder with 7 platinum coated electrodes Because of the small inner diameter of 8 mm the cell needs a minimum vertical flow velocity to obtain full accuracy The cell is vulcanised with rubber in a mould The cleaning procedure must be carried out very carefully hence the glass cylinder is sensitive against shock and impact Technical characteristics Manufacturer ADM Model 7 pole electrode cell Cell factor K 1 2 Ranges 0 6 mS cm 65ms cm Response time 100 msec at 0 5 m sec flow Reproducibility lt 2uS cm Accuracy 10 uS cm Maximum depth 6000 m Min flow through the cell 5 cm sec Conductivity sensor 6000 m Combined CT sensor Can be used up to 2000m instead of single sensors T and C Specifications and description see 3 3 and 3 4 Sea amp Sun Technology GmbH ArndtstraBe 9 13 D 24610 Trappenkamp Germany Tel 49 0 4323 910913 Fax 49 0 4323 910915 www Sea Sun Tech com SST CTD90M user s manual page 17 51 3 5 Oxygen sensor The oxygen sensor measures the dissolved oxygen in the water using polarographic methods The platinum cathode has a diameter of 4mm and is encased with a teflon membrane The oxygen current consumption ranges from 0 to 12 pA due to the big diameter of the platinum wire The relative high current consumption requires a minimum current flow of 10 cm sec in order to avoid oxygen depletion in front of the membrane Technical data Manufacturer SST Oxyguard DO522M18 Type
46. ut of the probe interface 7 Operating the memory probe 7 1 Control elements On the top cap of the memory probe there is a duo coloured LED and a reed contact located behind a glass window The LED s are used to display operating conditions red LED Oi see Power on red LED off Power off green LED blinking Storage of data The green LED is on only the short time data is written to the flash eprom Red and green LED on at the same time result in light yellow colour When the probe is connected to a power source either battery or external power supply it is always operating in an unconfigurated mode without valid configuration transmitting data without data storage The probe then can be switched off with the magnet Power switching is executed under several conditions 1 A signal on the RxD line turns the power on in any mode The start communication command in the user menu is used to switch the probe on and interrupts the current operating mode 2 Activation of the reed contact turns the power on and starts the selected operation mode except FSK mode and time mode 3 Detection of turn on time time mode switches the power on 4 Detection of FSK status bit turns the probe automatically on Reed contact The activation of the reed contact is made by a magnetic rod part of the delivery The rod should be led vertically with the magnetic tip to the indicated borehole near the
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