Home

Microstructure Profiler MSS90

1. Sea amp Sun Technologies 24610 Trappenkamp 20 07 2006 14 03 46 L Scherungsverstarker TP27 Gel C68 eenr 2 F TP26 X Zi coz ceg g nt B r TP28 5v TP18 QQ Surer Sea amp Sun MSS Mikrostrukturprofiler Technology Baugruppe Scherungsverstarker 24610 Trappenkamp I Bre ci d Q02 E05 E Sheet 4 5 Tel 04323 910913 Gutt 20 07 2006 17 28 14 rax 04323 910915 eert 822eese 1N4148 D1 L TLC27L7 C12 T t alle tLs E O p 5 pF e EE ON N i o 120K s ILC27L7 Sea amp Sun MSS Mikrostrukturprofiler Technology Baugruppe Analogplatine 2 24610 Trappenkamp ian E Q02 E07 F Sheet 1 2 Tel 04323 910913 Gutt 07 09 2007 17 31 15 Fax 04323 910915 0026071 TP10 TPS 0 ES 6 TP18 TP11 I c28 ep Pa oIC7P Ch iganr iganr C30 100nF C31 vk 100nF 2 T Sea amp Sun Technologu 24610 Trappenkamp Erfurter Str 2 Tel 04323 910913 MSS Mikrostrukturprofiler Baugruppe Analogplatine 2 002 EQ7 F Sheet 2 2 papa B1923 919919 esp 0020074 Microstructure Conductivity Re ori K photo current coax AMT DO Signal GND black TP18 Ri ai Signal In yellow TP9 Zu JA IB 258 IE 100K Cyclops 7 green orange yellow Cskowa Jumper X 100
2. DN OO 3 The sensors The standard sensors as well as the microstructure sensors have all the same flange They can be plugged in any mounting hole of the bottom cap and are sealed to the cap with two O rings 16 1 5 Each of the flanges have a built in 6 pin glass feed through which is pressure resistant up to 400 bar and fitted with a small round connector for easy connection to the profilers electronic board The sensors are attached to the bottom cap by screws This construction allows an easy and fast exchange of sensors without the need of opening the pressure housing All you have to do is to remove the screws pull the sensor out of the mounting hole and separate the connection A new sensor will be mounted in the reverse way within a few minutes Sensor flange sensor connector face view 2x O rings 16x1 5 3 O ring 13x1 O One glass feedthrough 6pin 4 l LEMOSA 6pin connector Pin O Socket 3 1 Pressure transducer A piezo resistive full bridge in OEM version with a diameter of 15 mm and a total height of 5 mm is used as pressure transducer produced by the Swiss manufacturer KELLER The casing and diaphragm are made of corrosion proved alloy C276 The transducer is delivered with a small SMD PCB that includes a temperature compensation of the pressure measurement The sensor is mounted in the base cap of the probe the SMD board has contacts and is plugged onto the main board of the probe Manufact
3. 5 4 The conductivity sensor 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 CO 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 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 5 5 Oxyguard 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
4. Sea amp Ger t MSP Mikrostrukturprofiler Sun Baugruppe Technologies 002 E02 C prit Bearbeitet Gurt 29 82 2006 13 942 OR a IZ IZ LA TSE IZL O NO MO JO AO WON U IC13 IC14 IC16 IC17 IC18 IC21 IC22 IC23 IC24 IC11 IC4 IC25 IC6 Jala laha Naa VEE VDD IC1P IC2P UNT HOLE3 6 NT PAD RO NT PAD RO NT PAD RO NT PAD RO UNT PAD RO NT PAD RO UND3 6 UND3 6 UND3 6 UND3 6 UND3 6 UND3 6 Sea amp Sun Technologu 24610 Trappenkamp Erfurter Str 2 Te1 84323 910913 Fax 84323 910915 Li USS USS Baugruppe o MSP Mikrostrukturprofiler 002 E05 E Sheet 5 5 20 07 2006 14 03 46 Gepruft PSS TC Sea amp Sun MSS Mikrostrukturprofiler Technology Baugruppe NTC und ACC Verst rker 24610 Tr nkam 7 Bluse cee n 002 E05 E Sheet 2 5 Tel 04323 910913 Gutt 20 07 2006 14 03 46 rax 04923 910915 Sept UC 802e85e PROGRESS 0 1 2 Volt SCHWARZ BLAU GELB WEIB ROT Technology Baugruppe Druckbr cke 24618 Trappenkamp Erfurter Str 2 Zeichn Nr 882 E25 E Sheet 3 5 Te1 04323 910913 Bearbeitet Gutt 20 07 2006 14 03 46 Sea amp Sun MSP Mikrostrukturprofiler Fax 04323 910915 Gepr ft 002e05e S O o sucer Sonz oo O an qzesgs ST6016 8Z8k0 Xe 4 ETEDBTE EZEHO TIL exonaqsirexbrtugAIe y amea4edue eddnabneg dweyusdde1 T9pZ E LC AZZ Bay UdZZzcUudO E gt
5. T t B 1 2B 2 n 3B 3 n3 4B 4 n 5B 5 n3 onyet dT dz 1 v aT et Z vertical axis vz sinking velocity of the profiler n raw data output of the high passed filtered NTCHP signal 6 dT dz n R2 C v2 aT n Appendix 3 Shear sensor description and maintenance PNSO01 shear probes for microstructure measurements May 2006 ISW Wassermesstechnik Dr Hartmut Prandke Lenzer Strasse 5 OT Petersdorf D 17213 F nfseen Germany Principle of operation PNS01 shear probes are airfoil type microstructure velocity fluctuation sensors designed for microstructure profiler The mean velocity due to the profiling speed V of the probe is aligned with the axis of the axially symmetric airfoil of revolution see figure 1 red tip While the probe is not sensitive to axial forces the cross stream transverse component of turbulent velocity u produces a lifting force at the airfoil A piezoceramic beam connected with the airfoil senses the lift force in one dimension PNS shear probe EX Airfoil Cross force Profiling velocity v 1 cm l The output of the piezoceramic element is a voltage proportional to the instantaneous cross stream component of the velocity field Eigure 1 Measurement geometry of PNS shear probe PNS shear probes are sensitive in the plain parallel to the marked site notching of the hexagon at the sensor socket Shear probes measure t
6. 2 SHE preamplifier and ACC preamplifier 7 1 Voltage regulation and RS485 driver is a circular shaped board of 75 mm diameter mounted on 4 distant bolts inside the top cap of the probe The basic circuitry of this board contains a polarity protection of the power input a dc dc converter conversion of the input voltage to stabilized 5 volt and 5 volt Data received from the mainboard1 as asynchronous NRZ signal 5 volt TTL compatible is converted into RS485 by a standard transceiver protected against ESDN and capable of sinking and sourcing up to 60 mA current to the sea cable in differential mode Documentation drawing no 002 E01 L photo shows Version H 7 2 The Mainboard1 is a rectangular board of size 305mm 63 mm which is mounted on a aluminium supporting plate fixed to the bottom cap of the profiler The mainboard1 is electrically connected to the voltage regulation board by a four wire cable equipped with separable connectors Photo below shows MSS90 electronic mainboard1 with data acquisition module plugged on the right side and small progress print pressure on the left side e documentation drawing no 002 E05 E sheet 1 5 7 2 1 The data acquisition system is the heart of the MSS electronic A 8 bit microcontroller controls the high speed sampling A D conversion and the 16 channel multiplexer and produces the exciting signal for the precision temperature and conductivity bridges The analogue inputs
7. interior electrode isolating material capillary tube 0 10mm 2 Handling Before starting the measurements in the sucking chamber of the C MS sensor should be no water To remove water from the interior of the sensor see further down When soaked into water the air in the sucking chamber is compressed by the hydrostatic pressure and the interior electrode has contact to the fluid At depth greater approx 0 5m the inner electrode is completely wet 3 Maintenance After a cruise or at a longer gap in the measuring program the sea water in the sensor must be removed The following procedure is recommended 1 Bring the profiler with the C MS sensor in a vertical position 2 Open the revision hole at the sensor tip 3 Use a plastic bottle with a rubber tube as shown in figure 2 to pump the sea water from the sucking chamber of the C MS sensor 4 Put some fresh water in the plastic bottle and flush the remaining salt water from the interior of the sensor 5 Pump the remaining water out of the sucking chamber using the plastic bottle and rubber tube without water 6 Close the revision hole plastic bottle ss Figure 2 Arrangement to remove water from the sucking chamber an flush the interior of the C MC sensor C MS sensor Technical specifications can be changed without notice rubber tube Appendix 5 Sea cable Documentation Sea cable connector Sea cable wiring MSS Pr
8. blue Cskoe Jumper X 10 black 5 red TP3 TP4 pH Ref white blue S g Pr ojekt Mikr ostruktur pro iler Obj kt alogpla e 1 1 tine 2 S n J Techo 002 E07 F Sheet gt SHEET n rA S Mikrostructur profiler Pouer supplu board Connector to probe electronics Mate N Lock Housing 1 5U Connector face vieu 2 BU ket 4 5U socke O 4 seriell data output NRZ pin e Sea amp Sun Mikrostruktursonde Technology Baugruppe Seekabelkonfektionierung 24610 Trappenkamp g Erfurter Str 2 Zeichn Nr 002 D04 B Sheet 1 1 Tel04323 910913 20 07 2006 1655 46 Font 0329 1085 Genre 0 Microstructure profiler Mainboard Sensor connector pin layout and assignment Dressure transducer Keller PA 7 Progress Lemosa FFA 1 S 386 ZLA 2 6 4 5 cable length 15 cm face vieu white and yellow are connected on the SMD progress print NTC Temperature Sensor socket Connector Lemosa FFA 1 S 306 ZLA 2 5 Volt Signal in 5 Volt 3 Volt Ref 6 4 GND 5 nc cable length 12 cm face vieu Sea amp Sun Microstructure probe Technology Baugruppe Mainboard pin layout and assignment 24610 Trappenkamp I Erfurter Str 2 Zeichn Nr 002 E06 R Sheet 3 4 Tel04323 910913 20 07 2006 144119 Fas 883287918815 D Ger ee Microstructure profiler Mainboard sensor connector pin layout and assignment Current shear sensor face vieu Connector Lemosa FFA 1 S 386 ZLA 2 Pi
9. calibration sheet you have to transfer following new coefficients Sensor rawO2 O2 zero value input Ug mV A20 O2 input XO2 value Sensor T O2 A 0 A 3 input the coefficients of the ET polynomial 5 7 pH and ORP sensor Both sensors are principally maintenance free After its life span 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 dry 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 MO So only replace sensors under clean and dry conditions please The life span of the sensors ceases when the time constant of the pH or redox measurement drastically increases The life span has also ended when the reference electrolyte is dissolved down to the screw thread rim Water can then possibly leak in through the bolting The pH and Redox sensors are particularly endangered when they come into contact with H2S in water Some minutes in 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 refer to 7 7 Special care has to be taken that before using the sensor n
10. 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 jumpers The instrument is deliverd with the range 0 50ug l gain setting 10 For details and hints for application please refer to turner s user manual The manual is available on the CD ROM glass feedthrough 6pin 400 bar O ring 13x1 LEMOSA 6pin connector O ring 12 42 1 78 PSA 1S 306 ZLL 2 O rings Internal wiring 16 1 5 Signal colour Lemosa 2 AIN d Power red Pin 1 Power black Pin 2 Signal out orange Pin 3 4 6 Signal AGND green Pin 4 Gain 10 blue Pin 5 5 Gain 100 yellow Pin 6 e pin O socket Gain 1 Pin 5 and 6 left open Gain 10 Pin 5 tied to AGND connector face view Gain 100 Pin 6 tied to AGND 3 8 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 LI 193SA spherical quantum sensor determines specifically the Photosynthetic Photon Flux Fluence Rate PPFFR the number of photons in the vis
11. end caps and tube 4 pcs 16 1 5 mm Sealing between bottom cap and sensor flanges 2 pcs per sensor 12 1 5 mm Pressure sensor PA7 and PA8 13 1 mm glass feedthrough all sensors 8 1 5mm Sealing between microstructure sensor tips and flanges Appendix 1 The different microstructure temperature channels 11 1 Response time of the FP07 thermistor Thermometrics is the manufacturer of the famous FP07 thermistor NTC which is used worldwide for the measurement of microstructure temperature According to the company data sheet the response time of the FP07 should be about 7 ms or the signal band width approximately 23 Hz This is obviously too optimistic because our own measurements of the response time result in 11 12ms 13 14Hz cut off frequency which agrees very good with the measurements of other users The frequency response of the linear FPO7 NTC output is depicted in the plot as dark blue line in figure 1 50 10 0 FPO7 30 NTC A dB 50 70 90 0 001 0 01 0 1 1 10 100 1000 10000 frequency Hz Figure 1 The practical results show that the relatively low cut off frequency of the FP07 thermistor is not sufficient to obtain good temperature spectra due to the drop of signal noise ratio at higher frequencies In order to extend the FP07 signal band width an additional circuitry is introduced figure 2 The output of this tempera
12. pH Principle combination electrode with reference Range pH 3 5 10 5 Resolution 0 0001 pH Accuracy 0 05 pH Response time 1 sec 1 3 5 Redox sensor ORP Principle combination electrode with reference Range 2000 2000 mV Resolution 0 01 mV Accuracy 20 mV Response time 1 sec 1 3 6 Dissolved oxygen O2 Principle self galvanizing clark elektrode Range 0 200 Resolution 0 01 Yo Accuracy 2 Response time 3 sec 1 3 7 Turbidity TURB Principle optical back scattering 90 Range 0 25 125 500 2500 FTU Resolution 0 01 Accuracy 2 Response time 100 ms 1 3 8 Fluorescence sensor FL Principle fluorescence 180 Range 0 50ug L Chl A Resolution 0 01 Yo Accuracy 1 Response time 100 ms 1 3 9 Microstructure temperature sensor NTC Principle NTC resistor electronically linearized Range 2 32 C Resolution 0 0005 C Accuracy 0 02 C Response time 12 ms at 1 m s flow 1 3 10 Microstructure current shear sensor SHE Principle piezoceramic bending element Range 0 6 1 s 10 10 W kg kinetic energy dissipation Resolution approx 10 1 s Accuracy not specified Response time approx 4 ms dependent on measurements conditions 1 3 11 Acceleration sensor ACC Principle piezoceramic bending element Range 0 3 m sec Resolution 0 005 m sec Accuracy 0 02 m sec Response time approx 4 ms 1 3 12 Microstructure conductivity C
13. pin assignments as described in chapter 3 2 and 3 3 The combined sensor is mounted on a single flange The only restriction is the depth rating which is limited to 2000m 3 4 Oxygen sensor 3 4 1 Oxyguard DO522M18 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 O 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 Oxygen sensor without protection cap Co Oxygen sensor with protection cap Technical data Manufacturer and model Oxyguard DO522M18 Type of sensor Clark electrode self galvanizing Polarisation voltage 0 7 VDC RANGE NT m 0 200 96 Oxygen current O 12 pA Temperature range 2 C 30 C Response time approx 3s 6396 10s 9096 AGC UTa6V u u ua a ech 3 Maximum depth 2000 m Output resistance 1 5k The Oxyguard Sensor is internally temperature compensated with a resistor and thermistor in the full ocean temperature range and thus provides a quite linear signal output The sensor ha
14. range from 3 VDC to 3 VDC producing a raw data count from 0 to 65535 The raw data is transmitted via the microcontroller s serial port with 614 4 kBaud 16 sensors 1024 complete datasets s to the RS485 transmitter The voltage reference ICE provides a high precision voltage of 3 volt with low temperature coefficient the negative reference voltage 3 volt is produced by the A D converter and op amp IC9 On the mainboard1 are 9 analogue channels occupied the remaining free channels can be accessed via the 50 pin connector CON1 from the mainboard2 which allows a system expansion up to 16 channels documentation drawing no 002 E02 C 7 2 2 The temperature bridge is realized as a full Wheatstone bridge with the platinum sensor Pt 100 as a part of the bridge The bridge is excited by a bipolar symmetrical square wave signal of 1kHz and 50 duty cycle The nonlinear platinum resistor is linearized by a INIC IC17B The output signal of the Wheatstone bridge is full wave rectified in a synchronous rectifier IC15 and IC16A B and smoothed in a low pass filter IC13A B All resistors used in the Wheatstone bridge have ultra low temperature coefficients of 1 ppm C documentation drawing no 002 E05 E sheet1 5 7 2 3 The conductivity bridge is excited by the same precision ultra stable square wave signal as the temperature circuitry The square wave signal is the reference input of an automatic integral control amplifier IC24
15. the same sensor shaft as the standard sensors but is distinctly longer The sensitive elements of all microstructure sensors are located in a horizontal plane 220 mm above the bottom cap surface Inside the microstructure flange there is a small printed circuit board containing the electronic circuitry for the preamplifier and linearization of the NTC characteristic and offering optimum protection against electromagnetic induced noise Manufacturer SST Sensor element Thermometrics FP07 Overall response time 11 12 msec Power supply 5 Volt 5 Volt Current consumption 1 mA Analogue output 3 3 Volt 2 C 30 C Length 220 mm Connector Lemosa PSA 1S 306 ZLL Pin Signal colour 1 5volt red 2 Analog out green 3 bvolt blue 4 3volt Ref brown 5 GND black 6 n C e Pin O Socket 4 2 Current shear sensor is used for the measurement of velocity microstructure An axially symmetric airfoil of revolution stands out from a cone shaped metallic protection cap The airfoil is connected by a cantilever with a piezoceramic beam inside the cap The mean velocity due to the profiling speed of the probe is aligned with the axis of the airfoil While the probe is not sensitive to axial forces the cross stream transverse components of turbulent velocity produce a lifting force at the airfoil The piez
16. this circuitry is to be found in chapter11 3 NTC NTCHP and NTCAC are located on the analog mainboard Document 002 E 05 E sheet 2 5 11 2 The pre emphasizeded temperature NTCHP uses the well known principle of pre emphasis of the higher frequencies The circuitry is depicted in figure4 Figure 4 R1 R2 150k C1 1uF C2 10nF R3 1k C3 1UF The relationship between Input voltage Vin and output voltage Vout Is described by a differential equation 1 Vout Vin R2 C1 dV dt Vin input voltage at TP1 Vout output voltage at TP2 f 100Hz 2 f 1 2TTR C fc start point of pre emphasis 3dB slope of the pre emphasis 20dB decade R2 C1 0 15sec f 1Hz The NTCHP channel is calibrated in C using a low pass filter with 0 2s response time The frequency response of the NTCHP channel is shown in figure 5 TP2 40 20 20 TP2 A dB 40 60 80 0 001 0 01 0 1 1 10 100 1000 10000 frequency Hz Figure 5 11 3 The linear high resolution channel NTCAC Is designed for applications which require a linear characteristic with high resolution The circuitry consists of a high pass filter with f 1Hz a linear amplifier with gain G 10 and a subsequent first order low pass filter with a cut off frequency of 150Hz see figure 6 Figure 6 R1 150k C1 1ygF R3 90k R4 10k R2 1k C2 1uF The output is linear in the range 1 100Hz frequency response given below in figure
17. 19 oO u ip R2 188K 1pF 108K esol Lut CSS di e Projekt Mikrostruktursonde Technologies Ob Jekt Leitfahigkeit 24610 Trappenkamp 002 E10 D Too Tl Erfurter Str 2 H 3 E 15 01 2007 17 42 00 p nu e C 100 100nF 1 5M R23 R22 gog Sea amp Sun Projekt Mikrostruktursonde Technologies Objekt Leitf higkeit Naa 002 210 C a el Erfurter Str 2 E e es 15 01 2007 17 42 00 I Gepr t eezeseo NTC SENSOR 180K 2 poliger LEMO OPA2277PA OPA2277PA Sea amp Sun MSP Mikrostruktursensoren Technology Baugruppe NTC Uorverst rker 24610 Trappenkamp r Erfurter Str 2 Q04 E01 A Sheet 1 1 Te1 94323 918913 20 07 2086 18 13 24 rex 01929710915 oa see Sea amp Sun SP Mikrostruktursensoren Technologies TC Vorverst rker 24618 Trappenkamp Zeichn Nr Q4 E 01 6 ee Bee Gep t IJ Loge O Sea amp Sun Projet MSP_ Mikrostruktursensoren Technologies NTC Vorverst rker DU 004 E 01 0 Bottom a Ee Gepr t L fnE n Sea amp Sun MSP Mikrostruktursensoren Technology Baugruppe Scherungsvorverstarker 24610 Trappenkamp Erfurter Str 2 Zeichn Nr B804 E92 A Sheet 1 1 TeL 04323 910913 15 04 2005 119614 rem 019227910015 D Gepr ee Sea amp Sun Projekt MSP Mikrostruktursensoren Technologies ie o Scherungsflansch o Quo beam lon E772773772 TNI Sea amp Sun Projekt MSP Mikrostruktursensoren
18. 2 Exchange of DO sensor heads The exchange of sensor heads is very easy and could be done by the customer within a few minutes For exchanging the sensor head first push on the plastics cap to protect the sensor body and dry the sensor head do never touch the glass tip a little bit to avoid the get in of water into the plug connections Unscrew the titanium screw now and pull out the sensor head carefully only by light turning of the sensor head After this pull off the sensor head do not twist very carefully and slowly only 1 2 cm until the connector and the cables are visible Disconnect now carefully plug and socket Avoid the damage of the cables when disconnecting this electrical link For mounting a new sensor head take note that the pins will not be damaged inside the connection when pushing on the sensor head into the plug Therefore you will find red points on the plug and on the socket These points have to be in opposite when pushing on the sensor into the socket Do not twist socket and plug This may damage both sensor head and the socket leading to expensive repair work Now lead the sensor head into the flange and screw on the titanium screw Make sure that the sensor is mounted correct and waterproof Please note The repair of water damages or of broken pins is not covered by warranty Do not forget to make the correct inputs of coefficients and calibration constants after the exchange of the sensor head From the AMT
19. 7 A dB 100 0 001 0 01 01 1 10 100 1000 10000 frequency Hz Appendix 2 NTC data processing De emphasis of the digital NTCHP signal Please note T1 Tntc Temperature calculated from T1 ZA i n 2 n1 raw data count from the NTC channel f T3 TurcuP Temperature calculated from T3 XA i ns 2 n3 raw data count from NTCHP channel NTCHP data processing result raw data out first order low pass filter first order high pass filter Figure 7 The temperature values are obtained from the NTCHP raw data output by sending the NTCHP raw data through a first order low pass filter with a cut off frequency fc 1 21r R2 C 1Hz The de emphasized temperature T3 is calculated according to the standard SST polynomial and supplied as calibration sheet 3 T3 C gt A i n3 2 ZB i n Ali coefficients for polynomial with offset 2 B i coefficients for polynomial without offset Determination of the temperature gradient 0T 0z from NTCHP raw data The use of a first order high pass filter with the cut off frequency fc 1 21 R C 1Hz will convert the frequency dependence of NTCHP as shown in figure 5 to a high pass with the cut off frequency of approximately 100 Hz For frequencies 100Hz the output raw data n of the high pass will obey the following relationship 4 n R2 C dn ot Differenciation of SST s temperature polynomial T3 leads to OT3ldt OT3l 0n Anzl t 5
20. 7 fe ZZZZ9dO ATZE ER ZZZZYdO D 4 ZZZZYdO ET Naat ei PT OT Z x LL m 2 HT S zezzuao jT audi S pga ZZcecUdO 00T ABOT Zzccudo AZZ AOZT L 28 31 8 zZZZZZZZ GJ OQ g r T lt i q qj lt Ken lt q lt q 090090 O Q Oo 0 OQ Q O OQ Q Q OQ O O O O Q OO oOo 6 00 d o 6 6 010 0000100000000 blau schwarz rot e TP8 GTP7 GTP6 seenr L04 18BnF T 18 F x 47 A e T of x DOOD ox E IC3 amp Du Tu ME ho T R12 el TP38G ES 00K dr RE TOpF 10 F E 100K 1 EA IN E KA 1 6 10 DER T fer R31 schwarz 168K R62 R a look pu TP37 ee are KA rot rot schwarz Donn OPRZ277 IC25 TUT 162k ER NG 2 Uolt PROGRESS O TP21 TP18 TP17 TP23 ACC gt blau schuarz rot frei 888 8 Q TP31 TP29 TP30 TP40 SH2 gt blau schwarz rot frei INA gp OUT y OUTI TP28 TP26 TP27 TPS TP14 TP13 TP12 Pie TP15 SH1 gt blau schuarz rot frei 8 8 Q NTC gt blau schuarz rot braun gr n TP14r54 3 P12rp4 g P15 e MSP Mikrostruckturprofiler Analogboard 002 E05 F TP39 E INT IN2 OUT IN 0UT o IN amp TP17 LB Gi 1 S rp22 N P gt gelb weip rot schuarz blau 3 1P219 zi oO Es a F ke ZG S NP NG 4 NI 4 o y N H
21. 89 Fax 49 0 39932 13216 E mail prandke t online de Internet www isw wasser com Technical parameters can be changed without notice Appendix 4 Microstructure conductivity sensor for the MSS Profiler 1 Principle of operation The microstructure conductivity sensor is a capillary type two electrode probe This type of conductivity sensor is based on developments of the Atlantis Branch of the P P Shirshov Institute of Oceanography It s principle is described in detail in Paka Nabatov Lozovatski Dillon Oceanic Microstructure Measurements by BAKLAN and GRIF JAOT Vol 16 1519 1532 1999 The inner electrode in the conic sensor tip is a capillary tube with a diameter of 2 mm The outer electrode is the surface of the cylindrical sensor Both electrodes are made from stainless steel The contact surface between the inner electrode and the water is approx 2 3 cm This guaranties a low current density at the electrode surface and consequently a low level of contact polarisation noise According to Gibson and Swartz Detection of conductivity fluctuations in a turbulent flow field J Fluid Mech Vol 144 357 364 the spatial response of the sensor is approx 5 times the capillary tube diameter 10 mm The electrodes are driven by an alternating current at approx 28 kHz frequency socket revision hole outer electrode Figure 1 Schematic drawing of the C microstructure sensor for the MSS Profiler sucking chamber
22. 9 bTdi STdl UN NIN 1n0n NIN ea D ZUOFNT TE8b FNIL inon NIN UN NIN ang NIN iNon NIN TIG ZOOVNT K za DEE TEN4 4821 DC 2 TEN4 4822 TP14 TP16 TP17 TP15 Gas 8 Gin Projekt Mikrostruktursonde Technologies Ob Jekt Deckelplatine pues 502 011 Erfurter Str 2 a en 20 09 2007 15 29 30 er Ggep t LL Lee2eoa1 ocexco TI ds GT60T6 EZEV0 xe 4 DELT GOOc 90 90 YING aaxegsesg ETEBTE EZELO TOL Pea OHNO T T T 1890S O Z03 200 4N UYITEZ Z AS 4axanj43 uonirsinbeueie eddnabneg AB duexuedde4 T9pZ 4epuoadaninaisooaxm ASW 219 429 UN 3 POS Zo 991 deal IN IN NEE NC ENG zz jugar DN TONO d43l MHIL IN TIN NIA INON NG r asevod U d JON9Y Nasha ge Ba er 813 ddn u194 noxqozzo E 4dea 029 J T a88204 J TNO zHW99 6T 434N NISANOI Adz LSD NSO NIITI TO ANIN Naa taan eb N38H can KET m aT 972 d r E zT ATT ATT TE dugot JUYOT HL SQN8U Tdlcdl 4r 43un 2d S 43an 9a sa o Q Ng NG c O O Q NSI eau NAM T3 Bad NINE Wb ZI9T ANING GJ SNINS 9999 Q rr r 9909999999 rdi Edl 43 9 NZA38 299 UI V NG no CON2 TP1 TP2 cal a T N O NO od HY
23. A The output of IC24B presents the actual value of the voltage sensing electrodes which is kept constant by the integral controller The ac current flowing via the current sensing resistor R50 is linear dependent on the specific conductivity of the sea water The ac voltage across R50 is amplified and full wave rectified in a synchronous rectifier IC15 IC18A B and filtered in a low pass filter IC14A B documentation drawing no 002 E05 E sheet 1 5 7 2 4 The pressure amplifier consists of two parts one is the small SMD board named PROGRESS delivered with the transducer and containing the full temperature compensation of zero point and sensitivity The analogue output of this board is 0 1 2 volt DC with reference to the negative supply rail 5 volt The second part is a differential amplifier and low pass filter with a gain of 2 7 producing a bipolar output signal in the range of 2 7 volt documentation drawing no 002 E05 E sheet 3 5 7 2 5 SHE and ACC amplifier uses exactly the same circuitry it is a non inverting amplifier with a bandwidth of 0 16Hz to 300Hz 3dB with a fixed gain of 1 shear sensors and 2 for acceleration sensor documentation drawing no 002 E05 E sheet 2 5 and sheet 4 5 7 2 6 The NTC amplifier has three different analogue outputs NTC HTCHP and NTCAC The circuitry is described separately in the appendix documentation drawing no 002 E05 E sheet 2 5 7 3 Microstructure sensors Al
24. A A AV INN SI TV NN NY HIA HIA vv Fa lt S PS PS PS PS lt gt lt A BC D EFG The outside and middle electrodes are the current electrodes the smaller ones are the voltage sensing electrodes The middle electrode D is driven by an alternating current while the outside electrodes A G are held constant on sea water potential This symmetrical arrangement leads to an independence of the conductivity measurement from boundary conditions because the electrical field is completely kept inside the glass cylinder The great advantage is an easy and accurate calibration procedure with the same results in any surrounding The housing of the conductivity cell is made of a special sealing compound founded in a mould Manufacturer ADM Type 7 electrodes cylindrical cell max depth 600 Bar Elte 0 1 mS cm 0 6 mS cm 0 60 mS cm Length 15 mm Connector Lemosa PSA 1S 306 ZLL 7 standard ranges any other range between 1 70mS cm is possible The following diagram shows the face view of the sensor connector and gives the colours of the connection cable to the PCB Pin Signal colour 2 C blue 3 D red i 4 E yellow 5 5 F violet e Pin O Socket 9 G A green Option Combined T C sensor In case of insufficient space for sensors SST can offer a T C sensor with the same electrical specifications and
25. D14 L FEE ends statusbits AO A4 5 binary adress bits of the parameter D0 D15 6 binary raw data bits of the parameter Data transmission starts with the first byte from the right LSB to the left MSB and ends with the third byte The 16 sensors are transmitted in an uprising sequence of their binary addresses The parameters and their assigned binary addresses is listed in the following table The first bit of every byte is a fixed status bit which enables the data acquisition program to assemble the 3 bytes of each parameter in the correct sequence A complete data set is transmitted block wise starting with the binary address Oge and ending with the highest address 15 gec 16 sensors Address parameter Basic version mainboard1 Counter NTC microstructure temperature P pressure SH1 current shear 1 Pt100 precision temperature SH2 current shear 2 C conductivity ACC acceleration NTCHP microstructure temperature with emphasis NTCAC high resolution microstructure linear differential Additional parameters on mainboard2 MSS 36 CMdc Microstructure conductivity PAR Cmac Microstructure conductivity differential ChlA Cyclops 7 AMT fast DO Redox pH 9 Calculation of physical data The physical values are calculated from the binary raw data by the MSDA program The calculation is generally a polynomial of nth order Y XA i n 32768 calculation type N Verse physical value of the parame
26. DLSF and on the ship side with a LEMOSA round connector The cable drum is not intended to be used as hand winch The sea cable connection of the profiler is done by a male bulkhead underwater connector SUBCONN MCBH5M made of titanium and neoprene The following figure shows the face view and the pin assignment of the underwater connector MCBH5M Subconn face view Subconn Signal 1 pin 1 18 72 Volt 5 2 pin 2 0 Volt pin 3 RS485A 4 3 pin 4 RS485B pin 5 not connected The power supplied by the board unit is about 60VDC The basic version of the MSS profiler C T D NTC 2 SH ACC has a current consumption of approximately 25 mA on the short laboratory cable corresponding to 1 5W power consumption Data transmission is done in a RS485 and RS422 compatible mode The driver is able to supply 60 mA output current in differential mode The sea cable is terminated at the board with 112 Ohm resistor between A and B line and 56Ohm to GND 7 Short description of the electronics The electronic circuitry inside the MSS profiler consists of several printed circuit boards the basic version of MSS90 comprises the following boards and circuitries 7 1 Voltage regulation and RS485 driver 7 2 Mainboard1 with Data acquisition system Temperature bridge T Conductivity bridge C Pressure amplifier P Current Shear amplifier 2 SHE Acceleration amplifier ACC NTC amplifiers and filters NTC NTCHP NTCAC 7 3 1 NTC preamplifier
27. Microstructure Profiler MSS90 Operating instructions User s manual Version 5 17 11 2006 Table of contents 1 General System description 1 1 System properties 1 2 System parameters 1 3 Sensor specifications 2 Microstructure profiler design 2 1 The housing 2 2 The bottom cap 2 3 The top cap 2 4 Profiler suspension to the sea cable 2 5 Weights and flotation elements 2 6 Weights and measures 2 7 Dismantling the profiler 3 The standard sensors 3 1 Pressure transducer 3 2 Temperature sensor PT100 3 3 Conductivity cell 3 4 Oxygen sensors 3 5 pH and ORP sensor 3 6 Turbidity sensor 3 7 Cyclops fluorometer 3 8 PAR sensor 4 The microstructure sensors 4 1 Temperature sensor NTC 4 2 Shear sensor 4 3 Acceleration sensor 4 4 Microstructure conductivity 4 5 Surface detector 5 Maintenance of the profiler 5 1 Underwater connectors 5 2 Pressure transducer 5 3 temperature sensor PT100 5 4 Conductivity cell 5 5 DO sensor 5 6 pH and Redox 5 7 Turbidtity sensor 5 8 Cyclops 7 5 9 Microstructure sensors 6 Power supply and sea cable signals 7 Short description of the electronics 7 1 Voltage regulation and RS485 driver 7 2 Mainboard 7 2 1 Data aquisition system 7 2 2 Temperature bridge 7 2 3 Conductivity bridge 7 2 4 Pressure amplifier 7 2 5 SHE and ACC amplifier 7 2 6 NTC amplifier 7 3 Microstructure sensors 8 Serial data output and data format 9 Ca
28. Technologies Objekt Scherungs lanseh LL rashes Fees lot Ta ns ae I
29. chieved by a separable 6 pin round connector 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 ere 7 20 VDC 3 5 mA average Signal 0 5 VDC each range Scatterance angle 90 avg 15 150 Light source wavelength 880 nm The 4 ranges of the turbidity sensor can be selected by two control lines A and B The user is able to select a suitable range by operating two small SIL switches on the mainboard 2 please refer to circuitry documentation 002 E07 E Pin Signal colour O O ON 1 O volt brown 2 signalout blue A d 3 Signal GND green 4 10 volt yellow 5 5 Gain A orange e Pin O Socket 6 Gain B red 3 7 Cyclops 7 Fluorometer ChlA The Cyclops 7 used here for MSS90 is not the standard instrument from Turner Design In order to adapt the instrument to the pobe 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
30. de 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 KCI 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 mKCI solution pH 4 that prevents the reference electrode from drying out during storage a ER N NS NEA kb P dE _ pe paren 00 Q This kind of 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 12 mm Shaft material transparent plastic transparent plastic Bulkhead material Stainless steel stainless steel Thread G1 4 180228 G1 4 ISO228 Shaft length 84mm 84mm Length with flange 117 mm 117 mm Response time approx 1 sec approx 1 sec This sensor is pressure resistant up to several thousand meters depth with a slight increase of pH ORP values The connector pin assignment is the same for all models and depicted below pin signal colour 2 Ref white o o 3 pH ORP blue e o 4 5 5 e Pin O Socket 9 i 3 6 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 a
31. eplaced 5 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 Don t scratch the flat optical surfaces When mounting the sensor protection cage keep the font before the flat side free from reflective materials rods The sensitive volume is approximately 120 5 9 Cyclops 7 The Cyclops 7 is nearly maintenance free From time to time clean the polished optical surfaces with a soft paper Avoid the use of chemicals Don t scratch the fine optical surface Please note that the light beam has a certain angel to the instrument axis To avoid reflections and hence zero shifts of the measured values the sensor light cone should always be directed away from the neighboured sensors 5 8 Microstructure sensors The ACC and NTC sensors are maintenance free and do not require any attention Cleaning procedures for shear sensor and microstructure conductivity will be found in appendix 3 and 4 6 Power supply and sea cable signals The MSS profiler is connected to the board unit by a four conductor cable which has nearly neutral buoyancy and can carry weights of more than 50 kg If the system is ordered without winch a cable drum with slip rings is provided for the transport of the sea cable The cable is fitted with the proper underwater inline connector SUBCONN MCIL5F and locking sleeve SUBCONN MC
32. eramic beam of a PNS01 shear probe in a pressure tank at 300 bar There is no decrease of the impedance during the 75 days test period Maintenance Don t let dry out salt water in the inside the shear probe After recovery of the profiler the shear probe should be flushed with fresh water As shown in figure 10 a soft rubber tube is pressed to the conical cap for flushing the sensor After flushing the remaining water in the interior of the shear probe should be pumped out using the plastic bottle and rubber tube without water profiler in vertical position plastic bottle fresh water rubber tube Figure 7 Arrangement to flush the PNS shear probes In situations with high particle concentration the PNS shear probes should be cleaned from time to time by additional flashing with fresh water Technical parameters Impedance piezo ceramic beam typical 100 GO Capacity piezo ceramic beam typical 1 6 nF Piezoceramic beam isolation Teflon Resonance frequency approx 420 Hz Depth range max 1000m tested Airfoil dimensions 3 0 mm L 4 0 mm Sensor dimension Length total 65 mm Diameter 11 mm Materials Housing Titanium Airfoil Plastic Please notice The piezo ceramic bending element in the shear probe can easily break Shear sensors are consumables Contact ISW Wassermesstechnik Dr Hartmut Prandke Lenzer Strasse 5 OT Petersdorf D 17213 F nfseen Germany Phone 49 0 39932 131
33. ft side the MSS90L with the housing length of 1 25m the housing of the standard model MSS90 is only 1m long This fact lead to a difference in weight 12 5kg 10kg and to a different number of necessary buoyancy rings 8 6 The standard MSS90 is easier to handle especially from small ships but the shear sensor data quality of the MSS90L is superior due to the higher mass and stability of the MSS90L The deployment depth for MSS90 and MSS9OL is 500m For special applications the MSS90 can be delivered with a lighter housing smaller wall thickness This version has a weight in air of approx 9kg and an operation depth of not more than 300m MSS90D photo middle and right This model is designed for a maximum depth of 6000m The length of the housing is relatively short 62cm compared with the other models The MSS90D uses a single buoyancy element which is clamped with a POM ring on the top of the housing The total weight in air is approximately 26kg housing 8kg the total length about 1 30m The profiler stability is excellent and the best of all models All the different housings have the same diameter and are made of seamless drawn titanium tube MSS90 and MSS90L MSS90D complete MSS90D housing 2 2 The bottom cap The bottom cap is designed to accept a high number of sensors on the smallest possible diameter We have 9 positions for sensor mounting and a diameter of 90 mm The inner four positions are intended for the mount
34. g buoyancy The flotation elements are clamped to the pressure pipe with two locking rings made of POM which have nearly neutral buoyancy photo right The uppermost flotation element has a ring of fringes which increases the drag of the profiler and prevents the generation of large eddies at the end of the profiler which would increase the vibration level of the sinking instrument 2 6 Weights and measures MSS90 MSS90L MSS90D Length overall approx L mm 1400 1600 1600 Length of the housing L mm 1020 1270 640 pipe diameter mm 89 89 89 wall thickness mm 510 5 5 7 6 Sensor protection cage L mm 275 275 275 sensor protection cage mm 255 255 255 probe suspension L mm 165 165 180 Weight overall approx kg 10 12 5 26 1 including end caps without weights and buoyancy elements in air 2 7 Dismantling of the probe Sometimes it may be necessary to dismantle the profiler e g for repair Please keep the following sequence switch off the sea cable supply MSS90D remove the buoyancy element MSS90 L D pull off the top cap after removing 4 screws at the end of the tube suspension and cap need not to be separated separate the cable connection between top cap and electronics remove the sensor protection cage pull off the bottom cap after removing 4 screws at the end of the tube Be careful during handling in order not to damage the sensors The assembling of the profiler is done in the reverse sequence
35. he velocity fluctuation relative to the movement of the profiler Consequently shear measurements require a low vibration level of the profiler Free sinking profiler operation with a slack in the cable between profiler and ship is recommended At rising measurements an additional buoyancy body below the profiler should be used to pull the cable from an underwater winch or a guide pulley Between profiler and buoyancy body a slack in the cable must be generated and kept during the measuring process To avoid falsification of the measured shear by resonant oscillation of the airfoil cantilever construction the profiling speed should not exceed 1 m s Construction of PNS shear probes The basic construction of the PNS01 shear probes is shown below _ Sensor shaft g 11mm __ Hole Piezoceramic beam Teflon tube Metallic cap Cantilever Airfoil 3 mm length 4 mm Figure 3 PNS01 shear probe Designed in 2001 produced since August 2002 The piezo ceramic beam is inside a Teflon tube The lift force is directly transmitted to the piezo ceramic beam Properties of PNS01 shear probes The properties of PNS01 shear sensors as described below have been determined during a series of laboratory tests and field measurements The general behaviour of the sensor is described Individual probes can have somewhat deviating properties Sensitivity The sensitivity is in the order of 1 10 Vms
36. hear probe is dependent on the temperature it decreases with sinking temperatures This effect is shown in figure 5 1 1 Sensitivity rel Temperature C Figure 5 Typical dependency of the of PNS01 shear probe sensitivity in relative values on the temperature The drop of the sensitivity with decreasing temperature can be approximated by the function Suse 1 0 011 Tc Tu Tc and Ty are the temperatures in C during the calibration and the shear measurements at sea respectively Sy and Sc are the sensitivities at the temperatures Ty and Tc Tc belongs to 21 C for shear sensors calibrated by ISW Wassermesstechnik The resulting correction factor for the dissipation rate is 141 0 014 Te Ti Long term stability Piezo ceramic beams as used in the PNS shear probes to detect lift forces have an extreme high impedance in the order of 10 Q 100 GQ If moisture penetrates through the isolation during long term exposure of the shear probes to water the impedance decreases This leads to a decrease of the shear probe sensitivity At PNS01 the Teflon tube effect an excellent isolation against water Even under high pressure the impedance of the piezo ceramic beam remains for a long time above 100 GO see figure 6 C c CH e T T Impedance GOhm T 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Time days Figure 6 Measurement of the impedance of the piezo c
37. ible 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 6 023 107 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 The sensor is mounted via a 4wire underwater cable Please note the light sensors must be mounted on the top of the probe to avoid shade of neighboured instruments 4 The microstructure sensors 4 1 Temperature sensor NTC This thermo probe consists of a small diameter glass coated thermistor bead hermetically sealed at the tips of shock resistant glass rods The extremely small size allows an ultra fast response time of 7 ms at 1m s flow The thermistor beads are aged for extended periods at a temperature of 300 degree Celsius which results in an excellent long term stability and accuracy The thermistor element is glued with adhesive into the sensor tip and protected by a perforated tube against impact and collision with other material The angular width for undisturbed measurements is approximately 120 degrees which allows sinking velocities down to 10 cm sec The sensor tip is made of titanium and screwed into the microstructure flange The microstructure flange has
38. ing of the microstructure sensors the 4 positions on the outer pitch circle should be occupied with standard sensors All sensors have the same flange and fit in any mounting hole of the bottom cap The sensors are fixed to the end cap by screws M4 8 DIN 912 The pressure transducer is inserted into the base in the centre position inside and held by a brass nut M18 1 against the pressure from outside A female thread 1 2 UNF 28 THD is used as calibration connection for a pressure gauge The bottom cap is made of titanium and is screwed to the pressure tube with 4 screws M3 6 DIN912 and sealed with two O rings 76 2 5 mm On the inner side of the cap there are four threads M4 for the mounting of the supporting plate and electronic boards Electronic boards and sensors are connected by separable cable connectors for easy exchange of sensors 2 3 The top cap The top cap has the same size and shape as the bottom cap and is made of titanium fixing to the tube and sealing is done in the same way It has a thread 7 16 UNF 20 THD for the mounting of the sea cable bulkhead connector There are 2 threads M6 for the attachment of the sea cable suspension Inside the cap a circular shaped electronic board is mounted on 4 distant bolts The board contains the DC DC converters for power supply and the RS485 cable driver The link between the top cap and the profiler electronic boards is done by a separable cable connection 2 4 Profiler sus
39. kg Individual calibration is necessary For the calibration of shear sensors a special shear probe calibration system has to be used ISW Wassermesstechnik provides a calibration service for shear probes The following calibration arrangement is used The probe rotates about its axis of symmetry at 1 Hz under an angle of attack a in a water jet of a constant velocity U At different angles of attack the rms voltage output E of the probe is measured The probe sensitivity is the slope of the regression best fit of a cubic approximation obtained from the equation E qU S sin2a q is the density of water and S is the shear probe sensitivity in Vms kg Thermal drift Exposed to temperature changes shear probes show an offset in its output voltage The low frequency thermal drift time scale several seconds has to be filtered out in the procedure of shear computation 20000 000 SHE1 6001 1 50000 000 0 000 NTC dest 1 20 000 L 1 1 1 L 1 1 1 1 J 0 000 1 PRESS dbar 1 1 1 1 1 f 40 000 L L Figure 4 Shear measurements with a rising MSS profiler across a strong thermocline Blue temperature measured with fast FP07 sensor Green output of shear sensors raw data The PNS01 shear probe shows a pronounced offset of the output voltage when crossing the thermocline The low frequent oscillations near the surface are caused by waves Temperature dependency of sensitivity The sensitivity of PNSO1 s
40. l microstructure sensors SHE ACC NTC have integrated preamplifiers in their flange The reason is to achieve a better performance by reducing the electromagnetic induced noise Especially the ultra high impedance outputs of the shear and acceleration sensors need good magnetic and electric shields for an acceptable noise immunity The printed circuit boards are supplied with 5 volt and 5 volt and are soldered directly on the inner side of the glass feedthroughs All boards and sensors are connected by separable 2 pin connectors inside the flange NTC preamplifier on the glass feedthrough ACC and SHE have a gain of 11 and a high pass filter with a low cut off frequency of 0 16 Hz while the NTC amplifier has a linear response documentation drawing no 004 E01 A NTC 004 E02 A SHE ACC 8 Serial data output and data format The serial data uses an UART compatible NRZ format with the following characteristics Baudrate 614400 16 sensors PANY TT no Character length 8 Number of stop bits 1 Protocol uu asas none Klee RS485 SIg a S1u u uuu u tu A B Q Q Data is transmitted only in groups of 16 sensors at a repetition rate of 1024 complete datasets per second Each of the 16 parameters is transmitted with 3 bytes according to the following scheme 1 byte D6 D5 D4 D3 D2 D1 D0 H 2 byte D13 D12 D11 D10 D9 D8 D7 H 3 byte A4 A3 A2 A1 A0 D15
41. l wiring and connector pin assignment of both transducers is depicted below lin ato 6 Uout Uout Lemosa connector PSA 1S 306 ZLL face view lin lin2 socket e pin Pin No Signal cable color 1 lin black 2 lin 1 white 3 U out blue 4 U out red 5 lin2 yellow 6 not connected 3 2 Temperature sensor Pt 100 is a platinum resistor of 100 Ohm at 0 C and a size of 0 9 mm diameter and 15 mm length It is mounted into a thin titanium tube of 1 2 0 1 mm and approximately 35 mm length The fine needle shaped pipe is very sensitive against touching or bending and therefore sheltered by a perforated protecting tube of 10 mm diameter The electrical connection is done in four wire technique in order to avoid the influence of the wire and the connector resistance Manufacturer SST PO EE Isotech P100 1509 Response time 150 ms at 1m sec flow Length 90 mm Lemosa connector PSA 1S 306 ZLL 2 T1 T2 3 1 5 face view T4 T3 O socket e Pin The sensor is connected in four pole technique pin assignment is depicted below Pin1 T1 black Pin4 T4 black Pin2 T2 red Pin5 not connected Pin3 T3 red Pin6 not connected 3 3 The conductivity sensor uses a cylindrical 7 electrode quartz glass cell with platinum coated rings as electrodes in the inner side of the glass cylinder The following schematic shows the electrode arrangement and cell geometry AV A A
42. lculation of physical values from raw data 10 11 12 13 14 15 16 Accessories and spare parts Appendix1 The different microstructure temperature channels Appendix 2 NTC data processing Appendix 3 Shear sensor description and maintenance Appendix 4 Microstructure conductivity sensor for MSS profiler Appendix 5 Documentation Appendix 6 Oxyguard DO sensor 1 General system description 1 1 System properties The MSS90 Profiler is an instrument for simultaneous microstructure and precision measurements of physical parameters in marine and limnic waters It is designed for vertical profiling within the upper 2000 m Microstructure investigation requires an undisturbed measuring procedure of the profiling instrument Effects caused by cable tension vibrations and the ship s movement have to be excluded by buoyancy driven free sinking of the MSS Profiler This requires a slack in the cable near to the profiler The loop in the cable is generated and kept during the profiling by immersing sufficient cable into the water For vertical sinking measurements the profiler has to be balanced with a slightly negative buoyancy which gives it a sinking velocity in the range between 0 3 to 0 7 m sec The profiler can be manually handled and recovered For more convenient operation special portable winches are available The data are transmitted via electrical cable to an on board unit and further to a data ac
43. m Principle capillary cell two electrodes Range 0 60 mS cm Resolution 1uS cm Accuracy 0 5 mS cm Response time approx 5 ms 2 Microstructure profiler design All mechanical parts are of the profiler are constructed under the premise of a low vibration level during the sinking or rising movement of the instrument in water Furthermore the housing of the MSS is designed to have a resonance frequency of the first bending mode above the frequency range used for computation of turbulence parameters from the shear measurement approx 1 50Hz 2 1 The housing The housing of the MSS profiler has to comply several conditions It must have a certain length and weight in order to stabilize the instrument during profiling and to reduce tumbling in shear layers Another important consideration is that the volume of the housing has to compensate the weight of the probe the remaining negative buoyancy of the profiler in seawater should be compensated by floating elements mounted on the top end of the housing On the other hand the instrument should not exceed in size and weight the limits of easy handling and simple deployment But most important is to withstand the water pressure All these aspects lead to the following different models designed for different depth ranges and measurement conditions MSS90 and MSS90L There are 3 different models available with the same electronic and sensor equipment The photos below show on the le
44. macros The macros can be applied to one data file or to a list of data files Graphical utilities enable a comfortable quick look of the measured and processed data The MSS microstructure measuring system has some outstanding properties which results to a superior performance related to other microstructure profilers The MSS90 profiler has a high sample rate and high analogue band width The system allows a number of sensors to be connected directly to the bottom of the profiler without the need to use underwater connections The following table lists the most important features in a short review sample rate 1024 data sets sec Number of parameters 16 dataset number of analogue channels 15 Bandwidth of microstructure channel 150 Hz 3dB response time of MS channels 12 ms Resolution all channels 16 bit Data transmission is 614 4 kbaud tested for cable length up to 1000 m 1 2 Sensor equipment The MSS90 profiler may be equipped with up to 9 different sensors on the bottom cap which can be subdivided in two different groups Standard CTD sensors Microstructure sensors The standard CTD sensors have a relatively slow response but high accuracy The following sensors are available Pressure Temperature PT 100 Conductivity pH ORP Oxygen Fluorescence Chl A Turbidity The microstructure sensors are especially designed for the measurement of small scale stratification and t
45. n No Signal cable color 1 3 5 Uolt Signal input 5 Uolt nc 6 4 GND nc 5 cable length 10 cm pin e Socket C Acceleration sensor shear reference Lemosa FFA 1 S 306 zZL 2 5 Volt Signal input 5 Volt nc 6 4 GND 5 nc face vieu cable length 10 cm Sea amp Sun Microstructure probe Technology Baugruppe Mainboard pin layout and assignment 24610 Trappenkamp I Erfurter Str 2 Zeichn Nr 002 E06 R Sheet 1 4 Tel04323 910913 20 07 2006 144110 re 883287918815 D Ger ee Microstructure profiler Mainboard sensor connector pin layout and assignemt Temperature Pt 100 Lemosa FFA 1 S 306 72LR TA T2 T3 T4 nc nc cable length 25 cm face vieu socket Conductivity Lemosa FFA 1 S 306 2LA cable length 28 cm face view Sea amp Sun Microstructure probe Technology Baugruppe Mainboard pin layout and assignment 24618 Trappenkamp I Erfurter Str 2 Zeichn Nr 002 E06 R Sheet 2 4 Tel04323 910913 20 07 2006 144119 ra 88328798815 D Ger ee devaze o 4n4deg GTGOTG EZEVO Xe 4 80 29 97 zeoz To aT ml i r qdaesg ET6016 EZEFB TOL T T 1eeusg Or3 208 4N uu5I 2 Z AS 4e14nj43 Mex3biuente addnubneg dueyuedde4 T9pZ spuosamamasosgu 95 AboTouy3a ung 3 ees o z ei AUT 1890T0v 13H AQyE AQyF C22 100K I Exo S Ns 1 K n B C16 ly HEF 4 53BT C
46. nse time typ lt 1sec Accuracy 296 Maximum depth 100 m Ranges up to 150 mg L available on request To achieve the highest possible accuracy the sensor has to be re ca librated from time to time This is especially recommended during the first weeks of the sensor life connector pin assignment Lemosa colour signal Pin 1 DC Pin 2 yellow current in 0 5 nA Pin 3 black signal GND Pin 4 DC Pin 5 DC Pin 6 DC 3 5 pH and ORP sensors 3 5 1 Depth range 0 500m pH and ORP 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 Hamilton Hamilton Model Polylite PRO 120 XP Polylite RX 120 XP Measuring range 4 10 2000mV 2000 mV Maximum depth 500m 500 m Shaft diameter 12 mm 12 mm Length with flange 167 mm 167 mm Response time approx 1 sec approx 1 sec 3 5 2 Depth range 1200m This pH ORP Sensor uses a pressure balanced plastic electro
47. o 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 pH ORP sensor 1200m H2S 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 AI cap from bo Moving elect Avoid any air inside the bottle fill completely with 3 M KCl 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 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 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 r
48. oceramic beam senses the lift force The cantilever construction acts as a lever increasing the bending force at the position of the beam The output of the piezoceramic element is a voltage proportional to the instantaneous cross stream component of the velocity field The axis of sensitivity of the shear probe is indicated by two marks at the housing of the sensor head near to the hexagonal section The narrow gap between cantilever and cap prevents damage to the beam by strong bending During in situ operations the interior of the cap is water filled Side holes at the upper end of the cap prevent air being trapped inside the cap The shear probe is screwed into the long microstructure flange Because of the extremely high impedance output of the shear sensor an ultra low bias preamplifier on a small printed circuit board is mounted inside the flange Type AA AA PNS01 Time constant 4 msec Power supply 5 volt 5 volt Current consumption 1 mA El 11 Rl P High pass 20dB decade Low frequency cutoff 1 Hz 3dB Connector Lemosa PSA 1S 306 ZLL Pin Signal colour i SIN 1 1 5volt red 2 Analog out green 3 Svolt blue 5 5 GND black e Pin O Socket 9 n C 4 3 Acceleration sensor To determine the level of vibration during the profiling process the MSS probe is equipped with a highly sensitive vibration control sen
49. od visibility of the instrument in the darkness Connector Lemosa PSA 1S 306 ZLL face view Pin Signal colour Pint 5V red Pin2 signal out grey Pina 5V blue Pind not connected Pind OVolt AGND black e Pin Q Socket Pin6 not connected 5 Maintenance and routine service of the MSS probe 5 1 The underwater connector is nearly maintenance free It is proved to lubricate the sealing surfaces not the contacts with silicone grease in order to reduce the forces during plugging and unplugging Please observe the following recommendations e connectors are best cleaned with warm soap water they do not have to be dried avoid the use of chemical cleaners do not disconnect by pulling on cables avoid sharp bends at cable entry to connector to prevent corrosion of the contacts never plug or unplug the connectors under water e unused connectors should never be left free they must be protected against sea water by dummy caps 5 2 The pressure transducer doesn t need any special treatment Never touch the stainless steel membrane with sharp or pointed tools in order to check the function of the transducer Doing so will affect the calibration and long term stability and sometimes lead to lasting damage 5 3 The temperature sensor is maintenance free Dirt and sediments only increase the time constant but do not affect the accuracy Be careful when cleaning the sensor Please do not bend the extremely sensitive needle
50. ofiler Power supply and cable driver Board layout and circuitry Internal connector Mainboard Mainboard1 Mainboard1 Mainboard1 Mainboard1 Mainboard1 Mainboard1 Mainboard1 1 T and C bridge NTC ACC amplifier Pressure amplifier SHE amplifiers misc Layout Sensor connectors Sensor connectors SHE ACC Sensor connectors T C Sensor connectors P NTC Mainboard data acquisition system Mainboard Mainboard2 AMT DO pH ORP PAR Module CM 2 Mainboard2 sensor connectors Mikrostructure sensors NTC preamplifier SHE ACC preamplifier drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no drawing no 002 E04B 002 E04B 002 E01 L 002 D04 B 002 E05 E sheet 1 5 002 E05 E sheet 2 5 002 E05 E sheet 3 5 002 E05 E sheet 4 5 002 E05 E sheet 5 5 002 E05 E 002 E06A sheet 1 4 002 E06A sheet 2 4 002 E06A sheet 3 4 002 E02 C 002 E07 F 002 E10 D MSS90 sensor connections drawing no drawing no 004 E01A 004 E02A ze o a GTGOTG EZEVO Xe 4 92 92 37 200z 6wOz yaragieag T60T6 EZEV0 TAL T T rays T 103 200 4N uu ti 2 Z AS 4exnj43 eune die32eg addnubneg duexuedde4 T9pZ spuosammasormu E AboTjouyaa UNS 3 Bag D CE8F FNIL 1non NIN 9Tdl ZTdl Q9 CTdl ETdl Q9 UNO NIN C
51. pension to the sea cable MSS90 and MSS90L The suspension is screwed with 2 screws M6 16 DIN 912 to the top cap and is necessary for the proper cable pull relief The intention is to keep pulling forces off the moulding junction of the cable The sea cable is first guided through a cable inlet which serves as anti kink device to protect the cable from damage Then it is winded in several turns on two bollards before it is definitely fixed in a clamp on the top of one bollard MSS90D The suspension of the MSS90D is mounted to the top of the buoyancy element Similar to the MSS90 90L version the cable is guided through a cable inlet and is then wrapped in several turns and fixed on a bollard 2 5 Weights and flotation elements In order to adjust the sinking velocity each MSS90 probe is supplied with flotation rings and a set of ring shaped stainless steel weights The standard set of weight rings consists of 10 rings with 125 90 mm diameter 2mm thickness which provides a maximum total weight of approx 1kg The weights are located on the sensor protection cage and fixed by a clamp photo left The MSS90D requires more weight rings The flotation rings are fixed at the upper end of the profiler housing photo right weights 5 125 90 mm 2 mm height 92g each 5 125 90 mm 5 mm height 230 g each The flotation elements are hollow cylinders made of syntactic foam The size of these elements is 150 90 mm diameter 42mm height 0 3 k
52. quisition PC The on board unit generates the power supply for the profiler and the receiver of the data link Data are stored online on the hard disc of the acquisition PC during the measuring process The basic hardware system for microstructure field measurements consists of several parts microstructure profiler USB Interface for power supply and data link to PC sea cable connection between interface and profiler winch manual or electrical PC Laptop or Notebook with USB port The measuring system can be powered either by mains 230VAC standard version or battery 9 36 VDC special version For data acquisition the Standard Data Acquisition program SDA is used SDA is running on Windows 98 to XP It displays the received data online and stores it on hard disk Graphical functions allow a convenient operation and online control of the system Conversion of the stored data files to ASCII is included For data evaluation the program DatPro can be used DatPro is specially designed for customers of the MSS Profiler It has the character of a toolbox It consists of a management program and many modules to carry out various steps of data evaluation The management program handles all modules and manages the dialogue with the user of the program The user of DatPro can select the various steps and the sequence in the data evaluation process dependent on his needs and aims of his investigation Single modules can be combined to
53. 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 2 in the backward position it allows the electrolyte to build a high impedance 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 centre 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 sensitivity slope can vary The user can execute a field calibration after each membrane exchange or when he doesn t trust the measured values anymore 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 p
54. rocedure is very simple Keep the membrane of the DO sensor dry Putthe red o ring in the backward position plug the protection 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 f 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 5 6 1 AMT fast DO sensor Mechanical stress of the sensor tip especially cross forces unintentional touch downs or strong
55. s a low output signal of approximately 30 40 mV for 10096 saturation Since the DO sensor is self galvanizing the output voltage is always available an can be checked with a standard voltmeter between pin2 and pin3 of the sensor connector Pin Signal colour Vout brown Vout blue O O1 O N 5 e Pin O Socket 3 4 2 AMT fast DO sensor The AMT fast DO shallow water sensor is a galvanic micro sensor which has been developed above all for the very fast in situ profiling of dissolved oxygen with CTD probe systems for depths of up to 100 m The sensor has a very short response time A streaming of the membrane as it is well known from nearly all kind of Clark type oxygen sensors is not necessary So profiling and stationary measurements without stirring the analyte become possible with a very high signal and local resolution The sensor is self polarising This avoids long adjust ment times after switching on The adjustment time depends only on the membrane swelling in water if the sensor was dryed out during storage and on the exchange of oxygen concentration at the very small sensor membrane The exchange of the sensor head is very easy and could be done by the customer himself Technical Specifications Manufacturer AMT Model galvanic Clark type micro sensor Polarisation approx 0 7VDC self polarising Range 0 200 saturation Oxygen input current 0 2 5 nA Temperature range 0 C 30 C Respo
56. s the surface of the cylindrical sensor Both electrodes are made of stainless steel The contact surface between the inner electrode and the water is approx 2 3 cm This guaranties a low current density at the electrode surface and consequently a low level of contact polarisation noise According to Gibson and Swartz Detection of conductivity fluctuations in a turbulent flow field J Fluid Mech Vol 144 357 364 the spatial response of the sensor is approximately 5 times the capillary tube diameter 10 mm The electrodes are driven by an alternating square wave at a frequency of 28 kHz The sensor tip has a revision hole with a female thread MA which is closed during operation by a screw with O ring This hole allows the cleaning of the sensor and calibration in laboratory under low water level conditions Pin Signal 3 O O ON 1 inner electrode 2 inner electrode 3 inner electrode e 5 4 GND 5 5 GND e Pin O Socket 6 GND 4 5 Surface detector The surface detector is used in the uprising mode to determine the exact moment when the microstructure sensors push through the water surface This sensor has a small titanium wire on the sensor tip and measures the polarisation of the water molecules independent of the actual conductivity The comparator output changes within one ms after having detected the surface An ultra bright high efficiency red LED is mounted inside the detector s transparent tip in order to assure a go
57. sor The vibration control sensor measures the horizontal acceleration of the profiler in one direction using a piezoceramic element Horizontal acceleration of the profiler generates a lifting force at a cantilever construction inside the ACC sensor The lifting force and thus the output of the sensor is proportional to the acceleration Due to the lack of space on the bottom end cap the ACC sensor is mounted inside the probe The housing of the ACC sensor has a length of 70mm and a diameter of 10mm and is made of brass At the bottom side is a mounting thread M4 Inside the brass cylinder is the piezo element and a tiny SMD preamplifier for the amplification of the ultra high impedance sensor signal Manufacturer ISW Type AA ACC Time constant 4 msec Power supply 5 volt 5 volt Current consumption 1 mA Gli 11 SIE High pass 20 dB decade Low frequency cutoff 1Hz 3 dB Connector Lemosa PSA 1S 306 ZLL Pin Signal colour 3 6 9 11 5volt red 2 Analog out yellow o o 3 Svolt blue e 4 n c 5 5 GND black 6 n c e Pin O Socket 4 4 Microstructure conductivity The microstructure conductivity sensor is a capillary type two electrode probe The inner electrode in the conic sensor tip is a capillary tube with a diameter of 2 mm The outer electrode i
58. ter een decimal value 0 65535 of the binary raw data Alias calibration coefficients determined as the result of a regression calculation after a calibration procedure Kennen index 0 5 P A5 gt A i n 32768 i 0 4 calculation type P A 5 is used for air pressure compensation zeroing pressure display For sensors with two different successive calibrations the NFC type Is used please refer to SDA manual page 47 Y A 4 A 5 X X ZA i n 32768 i 0 3 Such successive polynomial computations are used for PAR and fluorencence ChlA For each physical parameter there exists a calibration protocol with raw data physical data and physical values calculated according to the above described procedure Calculated sensors like salinity density or sound velocity use the actual UNESCO formulas 10 Accessories and spare parts In the following tables you find a selection of consumption material necessary for maintenance and service 10 1 Underwater connectors SUBCONN MCBH5M titanium Bulkhead connector on the top cap of the profiler SUBCONN IL5F Inline connector 60 cm pigtail for termination of sea cable SUBCONN MCDLSF Locking sleeve SUBCONN O ring 12 42 1 78 mm O ring for bulkhead connector 10 2 Interface connectors LEMOSA FFA 1E 304 CLAC50 Sea cable termination at the interface end LEMOSA ERA 1E 304 CLL Interface socket for sea cable connection 10 3 O rings 76 2 5 mm Sealing between
59. ture sensor T1 NTC removes the first low pass in the FP07 signal response sd N C O NTC Sensor Figure 2 R1 R2 12k C1 1uF C2 100nF R3 1k C3 1pF The exact cut off frequency is not known but the frequency response of this output is similar to the light blue line in figure 1 The following diagram depicts the principle structure of the NTC electronics for MSS90 T1 FP07 NTC NTC u amplifier frequency linearization compensation T4 High resolution AC coupled linear Figure 3 The block diagram shows the four different function blocks NTC lin is a small circuitry mounted on a 15mm glass feedthrough with a six pole Lemosa round connector and plugged into the flange of the microstructure temperature sensor please see photo chapter 7 3 This little board a preamplifier with a linearization of the nonlinear thermistor characteristic NTC is the circuitry described in figure 2 and contains the electronic for the FP07 band width extension The frequency response of the NTC output is quite linear even beyond the FP07 cut off frequency NTCHP is a pre emphasized analogue channel with a frequency dependent gain described in chapter11 2 This output should be used to achieve better signal to noise ratio at higher frequencies The data derived from this temperature has to be de emphasized later in order to get right scaled spectra NTCAC is an ac coupled linear amplifier with the gain G 10 the description of
60. urbulence They have a fast response and limited accuracy and long term stability Following sensors are available Temperature Thermistor NTC Current shear Conductivity Furthermore housekeeping sensors are integrated in the profiler Horizontal profiler acceleration Tilt two components Surface detector for rising measurements Except the tilt sensor all the above mentioned sensors will be mounted directly on the bottom cap of the profiler with no external underwater cable connection The tilt sensor is placed inside the profiler housing Details and a full description of all sensors are given in the following chapter 1 3 Sensor specifications The following specifications do not refer only to the sensor s properties but cover the complete instrument over the full temperature range from 2 C to 32 C 1 3 1 Pressure sensor P Principle temperature compensated piezoresistive full bridge Ranges 10 20 50 100 200 Bar Resolution 0 002 FS Accuracy 0 1 FS Response time 150ms 1 3 2 Precision temperature sensor T Principle linearized Wheatstone bridge with PT 100 Range 2 36 C Resolution 0 0006 C Accuracy 0 01 C Response time 150 ms at 1 m s flow 1 3 3 Precision conductivity sensor C Principle symmetrical cell with 7 electrodes Ranges 0 60 0 6 mS cm Resolution 0 001 mS cm 0 0001 mS cm Accuracy 0 02 mS cm 0 005 mS cm Response time 150 ms 1 3 4 pH sensor
61. urer KELLER Switzerland Model uuu uu PA7 50 Progress Measurement range 50 Bar Burst pressure 150 FS Overall accuracy 0 1 FS Sensor diameter 15 mm Sensor height 5 6 mm OTING VE 13 1 mm 50 standard range 10 20 100 Bar optional Full Scale range for MSS90 and MSS90L The sensor is a full Wheatstone bridge with a bridge resistance of 3 5kOhm at air pressure and driven by constant current The actual temperature of the bridge silicon chip is measured via the bridge voltage and used for compensation of thermal drifts of zero point and sensivity This results in good temperature and long term stability A female thread UNE 28THD with a depth of 10 mm in the center of the bottom cap allows the connection to a pressure gauge for calibration Please take care that the maximum allowable thread length of the gauge connector does not exceed 10 mm The deep sea version MSS90D uses a different model as pressure transducer Manufacturer KELLER Switzerland Models ee PA8 200 Progress Measurement range 200 Bar Burst pressure 150 FS Overall accuracy 0 1 FS Sensor diameter 15 mm Sensor height 13 mm Organe 12 1 5 mm 200Bar standard range 400 600 Bar optional Full Scale range for MSS90D Interna
62. vibrations have to be avoided The sensor tip is very weak Do not touch it Mechanical damage of the sensor tip excludes repair covered by guarantee If the probe is used near the bottom it is recommended to protect the sensor tip with an additional protection cap containing as much bore holes as necessary to guanrantee a good sample exchange The experience shows that a small hole in the bottom and two long holes on both sides of the cap are a good choice For cleaning the sensor head rinse it in water only Do not use organic solutions If there should be any biofouling at the sensor tip it is recommended to clean the sensor tip by immersing it into very diluted H2SO4 0 02 N H2SO4 or diluted NaOH 0 02 N NaOH for a maximum of up to 24 hours In case of higher concentrations the sensor tip may be damaged Protect the sensor tip with the wetting cap during long breaks Fill the wetting cap with less than 74 with destilled water If the sensor tip dries out it takes some minutes for swelling the membrane in water if the sensor is used again After buying a new sensor tip please calibrate periodically within the first weeks if necessary Within the first weeks the sensor s slope will decrease until it stabilises This is due to the adjustment of chemical and electrochemical equilibriums Please take care that the wet sensor tip does not freeze out in winter during storage on board of a ship This may damage the sensor tip 5 6

Microstructure Profiler MSS90

Contents

Download Pdf Manuals

Related Search

Related Contents