Operating Instructions Dissolved oxygen sensor
Contents
1. 5 C07 00841xxx 14 05 00 xx 001 eps Fig 4 Measuring system example Junction box VBM optional Transmitter OOM 253 Special measuring cable Immersion assembly Oxygen sensor dAQWN mA 3 3 2 Installing a measuring point Note For immersed operation install the individual modules away from the basin on a solid base Only carry out the final installation at the intended installation location For a complete installation of a measuring point proceed as follows 1 Install a retractable or a flow assembly if used into the process 2 Connect the water supply to the rinse connections if you use an assembly with cleaning function 3 Install and connect the oxygen sensor 4 Install an immersion or an suspension assembly if used into the process Caution For immersed operation the sensor must be installed in an immersion assembly e g OYA 611 Do not install the sensor suspended from the cable Screw the sensor into the assembly so that the cable is not twisted Avoid exerting excessive tensile force on the cable e g from jerky pulling Select the installation location so that there is easy access for later calibration Warning When using metallic assemblies and installation equipment comply with national grounding regulations INSTALLATION DOS41 3 4 Installation examples2. eee eee 4 Dimensions cece eee eee 7 Disposal 0 aE TE EEN eee 27 Dit src uel a Pee Ei PTT 28 E Electrical connection Direct connection 24 13 Via junction box aaau aaaea aaa 13 Environment 28 EOS a aa NN E VINEA NATAL 25 F Floating body crier ecdesia cee eee eee 11 Flow operation eee eee 12 l ICONS ra ua Hee Seas EE anaes eee 5 Immersion operation llle 10 Incoming acceptance aa 7 Inputs PANGAN ARDE oad Ys 28 Installation o o ooooooooo o 4 7 8 Angle of cse A ERR LE PER eR 8 Check co Sees NG ete dde RR DRM ds 12 Examples s araia se hu ES eee eee eee 10 Measuring point 2 00 ee eae 9 ile AA in Ped Ce Pa 8 M Maintenance 0 0 c cee eee ee 21 Measuring point 9 Measuring principle o o o oooooo o 16 Measuring SySteM o ooocoocccoccco oo 8 Mechanical construction 28 Membrane 0000 eee eee 16 Membrane protection basket 24 O A b egi 4 Operational safety liliis less 4 Ordering information 00 000 6 P Performance characteristics 28 Polarisation o oooooooooo o 16 19 loo CC 28 Product structure elles 6 R Regenerating lesen 22 Replacing Electrolyte a 22 Membrane cap aa 23 Sealing ring cece ee eee ee 22 FAGTUED ha Cort or aar base ta copes RS
3. 3 4 1 Immersion operation Upright post and chain assembly For large basins where sufficient installation distance is required from the basin edge aeration basin especially it is advisable to use the upright post and chain assembly Fig 5 Fig 6 The free swinging of the immersed assembly practically rules out vibrations from the upright post A good self cleaning of the membrane surface is reached due to the swinging of the assembly According to this effect the sensor life time can be extended 56 2 20 1 po i 1 A 60 2 36 x 60 2 36 x 2 0 08 I I 2 o e S eie gn 3 2 I x 2 2 ll max 1400 55 12 T j e Q 1480 58 27 1500 59 06 40 1 57 e 950 37 40 1630 64 17 1580 64 20 450 17 72 Bie cheeses 120 4 72 0 1 9 LLL s i i IN i i 3 z po 9 UY EG 4 150 591 4 Ko mm inch m mm inch C07 O0S41xxx 11 05 00 en 002 eps C07 00S41xxx 11 05 00 en 004 eps Fig 5 Universal suspension assembly holder Fig 6 Immersion assembly OYA 611 with immersible pendulum assembly Protection cap Second fixing possibility for transverse pipe Immersion assembly OYA 611 1 1 Weather protection cover 2 Worm drive hose clip 2 Upright post square pipe SS AISI 304 3 Pipe clips detailed drawing in right half 3 Transverse pipe SS AISI 304 4 PVC pipe
4. 4 27 S Safety ICONS is Hanga E xA e ASO s 5 Scope of delivery ee eee 6 Sealing KING etica ee bees uem de UND ANG 22 Sensor CHECKS apad Er ER NN SE oe hu 26 DESIGN apie dedi ida 15 DIMENSIONS 20x esas LAPAG Peewee i 7 Regenerating 0 0 eee ee eee 22 Spare Pants sont osse overseen eS 27 Stora JE aia eye hd nee hanna ace 7 Storage temperature 28 SYMDOINS AA AP 5 29 DOS41 T Technical data ooooooooooo 28 Environment ooo o o 28 A en ted eom 28 Mechanical construction 28 Performance characteristics 28 PLOCESS NAGA pet ta sh OI RR ANG 28 TRANS POM edn eters eR mE 7 U Upright post 2 0 eee eee 10 A A te ana a EMI TERE SEND SES F RER 4 W Weight oet Daan Alagaan EE Deme hu 28 Z Zero CUM 28 30 Declaration of contamination Dear customer Because of legal determinations and for the safety of our employees and operating equipment we need this Declaration of contamination with your signature before your order can be handled Please include the completely filled in declaration with the device and the shipping documents in any case Add also safety sheets and or specific handling instructions if necessary Type of device sensor Serial no Medium Temperature Pressure concentration Cleaned with Conductivity Viscosity Warning hints for mediu
5. QBaffle plate OP extra protection for extreme current conditions UMembrane protection basket OOY 3 SK or sensor use in fish ponds 8 3 Measurement controlling and sensor cleaning 000M223 253 Transmitter with integrated sensor function monitoring measured value monitoring free configuration alarm contact field or control panel installation HART or PROFIBUS possible Ordering acc to product structure see Technical Information TI 199e00 order no 51505694 24 DOS41 TROUBLE SHOOTING 9 Trouble shooting 9 1 Trouble shooting instructions If any of the following problems occur test the measuring device as indicated Problem Remedial action No display no sensor reaction Mains voltage to the transmitter Sensor connected correctly Medium flow available Coating on the membrane Electrolyte in the measuring chamber Connect mains voltage Set up correct connection Create flow Clean the sensor Fill with electrolyte or replace electrolyte Displayed value too high With a TOP 68 connection Humidity or Polarisation complete Last calibration with different sensor Temperature display clearly too low Membrane visibly stretched Electrolyte soiled Open sensor Dry electrodes transmitter display now at 0 Anode coating dissolved is the anode silver instead of brown Gold cathode silver plated Cleaning of the TOP 68 plug in connection by using cleanin
6. 22 ft 1 1 kg 2 4 Ib with TOP68 plug in connection 0 3 kg 0 7 Ib Sensor shaft POM Membrane cap POM Materials Cathode Gold Anode Silver silver bromide Process connections G1 and NPT Cable entry Fixed cable or TOP68 plug in connection Cable length incl extension cable max 50 m 164 05 ft Temperature compensation NTC temperature sensor 30 kQ at 25 C 77 F O 50 C 32 122 F Membrane thickness approx 50 um 28 DOS41 Index A Accessories Baffle plate oo ooooooooo 24 For cleaning oooooooommoo 24 For connection saasaa ss els 24 For installation ooo o oooo o 24 Measurement controlling and cleaning 24 Membrane protection basket 24 Amperometric principle 16 Angle of installati0N 8 B Baffle plate eee eee 24 Basin rim holder oo 11 C Cable connection 0 00 eee eee 28 Cable length cece eae 28 Calibration 0 0 0 0 a 20 Calculating the calibration value 17 General eee 16 AGA AA NA S 17 Chain assembly ee eaee 10 Checking Connection 0 002 eee 14 F nction niu De ee a eae 19 Installation llli 12 Cleaning Gold Cathode o oooocoooococmoo o 22 DONSOM aia a PS e NG 21 Commissioning s a aaaeeeaa 4 19 D Designated use
7. 4 Star handle 5 Threaded coupling 5 6 Upright post and fixed immersion assembly The preferable type of installation for strong or turbulent flow gt 0 5 m s in the basin or open channels is to secure the device to an upright post and a securely mounted immersion tube Fig 7 If the flow is very strong a second transverse pipe can be installed with its own pipe support DOS41 INSTALLATION 3 5 O o LO E mg el id D po J Do 4 o EC g S amp 2 o 4011 87 lt ON o 5 SES 5 d 8 eee pi 4 x ae FRE co K S o o maa N P e Y i 4x 12 0 42 150 5 91 y mm inch C07 00S41xxx 1 1 05 00 en 003 eps Fig 7 Universal suspension assembly holder with immersion assembly 1 Star handle Pipe holder Fixing bracket Immersion assembly immersion tube AUN Basin rim mounting For fixing to the sides of the basin or channel we recommend the use of an basin rim mounting of the immersion assembly Fig 8 Fig 9 5 Ed 2 2 4 QU 4 3 3 C07 O0S41xxx 1 1 05 00 xx 005 eps C07 00S41xxx 11 05 00 xx 006 eps Fig 8 Horizontal basin rim mounting Fig 9 Vertical basin rim mounting 1 Protection cover for cable entry 4 Basin rim mounting 2 Assembly holder 5 Star handle 3 Immersion assembly SS 1 4301 AISI 304 If there is strong turbulenc
8. 6 05 00 en 002 eps Fig 1 Fixed cable version Fig 2 TOP 68 plug in head version INSTALLATION DOS41 3 2 2 Angle of installation The sensor can be installed up to the horizontal in an assembly support or a suitable process connection Fig 3 Other angles are not permissible Do not install the sensor overhead FF A C07 00S41xxx 11 05 00 xx 001 eps Fig 3 Angle of installation A Permissible installation positions 0 180 overhead installation is not permitted Note Make sure you comply with the instructions for installing sensors You will find them in the Operating Instructions for the assembly used 3 2 3 Installation place e Select the installation location so that there is easy access for later calibration e Make sure that upright posts and assemblies are secured safely and vibration free e For immersed operation in an activated sludge basin select an installation location which produces a typical oxygen concentration 3 3 Installation instructions 3 3 1 Measuring system A complete measuring system comprises at least Oxygen sensor e Transmitter e g OOM 223 253 e Special measuring cable Immmersion flow or retractable assembly Optional e Universal suspension assembly support OYH 101 for immersed operation Junction box VBM with cable extension e Automatic spray cleaning system DOS41 INSTALLATION
9. 869 1700 0 820 200 0 977 750 0 916 1250 0 864 1750 0 815 250 0 971 800 0 911 1300 0 859 1800 0 810 300 0 966 850 0 905 1350 0 854 1850 0 805 350 0 960 900 0 900 1400 0 849 1900 0 801 400 0 954 950 0 895 1450 0 844 1950 0 796 450 0 949 1000 0 890 1500 0 839 2000 0 792 500 0 943 3 Determine L rel air pressure at calibration 1013 hPa if unknown M 1 02 for calibration in air resp 1 00 for calibration in air saturated water 4 Calculate the calibration value C C S K L M Example e Air calibration at 18 C altitude 500 m above sea level air pressure 1022 hPa e S 9 45 mg l K 0 943 L 1 0089 M 1 02 Calibration value C 9 17 mg l DOS41 COMMISSIONING 6 Commissioning 6 1 Function check Before first commissioning check if e the sensor is correctly installed e the electrical connection is correct If using an assembly with automatic cleaning check the correct water connection at the assembly rinse connection Warning Danger of medium leaking off Before applying compressed air to an assembly with cleaning facility make sure the connections are correctly fitted Otherwise the assembly may not be insert into the process 6 2 Polarisation The sensor was tested in the factory for perfect functionality and is supplied ready for operation To prepare for calibration proceed as follows 1 Remove the sensor protective cap 2 Pla
10. Operating Instructions OOS41 Dissolved oxygen sensor BA284e 00 04 04 8767 Brief overview Here is how to use these Operating Instructions to commission your sensor quickly and safely Page 4 ff Page 5 Page 7 ff Page 10 ff Page 13 ff Page 15 Page 16 ff Page 16 ff Page 19 ff Page 21 ff Page 22 ff Page 27 Page 25 ff Page 29 ff Safety instructions General safety instructions Explanation of the warning symbols You can find special instructions at the appropriate position in the chapter in question The positions are indicated with the icons Warning A Caution 6 and Note a v Installation Here you can find installation conditions such as sensor dimensions and the angle of installation Installation examples can be found here v Wiring Refer to theses pages for sensor wiring v Sensor design and measuring principle Here you can read about the sensor design The measuring principle is explained on this page Here you can find the possible calibration methods v Commissioning The sensor must be polarised before calibration Please read on the given page how to do it v Maintenance It is absolutely essential to carry out maintenance tasks on a regular basis Individual parts are subject to normal wear and tear Here you can find out how to replace such parts Here you can find an overview of
11. Replacing the membrane cap uncleanable membrane damaged membrane hole or overstretch Warning Before beginning regeneration switch off the power supply at the transmitter 7 2 1 Cleaning the gold cathode The cathode only needs to be cleaned when it is visibly soiled or there is a coating of silver on it To clean it proceed as follows 1 Unscrew the membrane cap from the membrane body 2 Carefully clean the surface in two stages with the abrasive sheet contained in scope of supply until the silver coating is fully removed Use the green sheet first and then the yellow sheet Clean the electrode with drinking or distilled water Fill the membrane cap with fresh electrolyte OOY 3 F and screw it back onto the membrane body up to the stop Caution The anode is covered with a silver bromide layer at the factory Do not clean the anode under any circumstances If the coating of the anode is removed as a result of operation the sensor is unusable and must be sent in for recoating In this case contact your sales office 7 2 2 Replacing the sealing ring Replacing the sealing ring is only necessary when it is visibly damaged For replacement use only the supplied sealing rings OOY 31 OR 7 2 3 Replacing the electrolyte The electrolyte OOY 3 F is slowly used up during measuring operations The cause of this is electrochemical substance reactions No substance reactions occur in de energised state and the electrolyte i
12. ce the externally dry sensor in atmospheric air The air should be saturated with water vapour Therefore install the sensor as close to the water surface as possible When calibrating the sensor membrane make sure the membrane remains dry Therefore avoid any direct contact with the water surface Connect the sensor to the transmitter and switch on the transmitter Switch on the transmitter If you connect the sensor to the transmitter OOM223 253 polarisation is automatically performed after switching on the transmitter 5 The polarisation time takes about 1 hour Note Polarisation starts high then drops gradually You will recognise the end of polarisation when the display stabilises and remains practically constant Caution When you remove the sensor from the medium protect the sensor from strong sunlight Make sure you comply with the instructions for commissioning and calibration in the Operating Instructions of the transmitter COMMISSIONING 00541 6 3 Calibrate Calibrate the sensor Calibration in air gt Page 17 immediately after it s polarisation The calibration intervals depend heavily on e The application and e The installation position of the sensor The following methods help you determine how long the calibration intervals should be 1 Check the sensor one month after its being put into operation by taking it out of the fluid drying it and then measuring the oxygen saturation index at ai
13. d valves or solenoid valves 1 Main line 1 Screw in part for sensor 2 Medium return 2 Screw ring 3 Oxygen sensor 3 Meter body 4 Manually actuated or solenoid valves 4 Connection thread G 5 Flow assembly OOA 250 A 5 Dummy plug connection for spray head 6 90 pipe bracket COR 3 8 Medium removal 3 5 Post installation check e Check the membrane for leak tighness und replace it if necessary Compliance with permissible sensor installation position s the sensor installed to an assembly and is not suspended from the cable Avoid moisture by rain by fitting the protective cap to the immersion assembly DOS41 WIRING 4 Wiring Warning e The electrical connection must only be carried out by authorised technical personnel e Technical personnel must have read and understood the instructions in this manual and must adhere to them e Ensure that there is no voltage at the power cable before beginning the connection work 4 1 Direct connection to the transmitter The sensor OOS 41 is connected using a special measuring cable Fig 13 The wiring diagram is contained in the Operating Instructions of the OOM 223 253 transmitter Terminal Assignment S Outer screen 12 Active inner screen NTC 90 Cathode 91 Anode 11 NTC temperature sensor C07 O0S41xxx 04 05 00 xx 001 eps Fig 13 Special measuring cable OYK 71 Note The interior white and yellow pilot wires have no function 4 2 Con
14. de and anode The resulting polarisation current is indicated on a display on the transmitter The current starts high but then drops over time The sensor can only be calibrated when the display is stable 5 2 2 Membrane The oxygen dissolved in the medium is conveyed to the membrane by the incoming flow The membrane is only permeable for dissolved gases Other substances dissolved in the liquid phase e g ionic substances will not penetrate through the membrane Therefore medium conductivity has no impact on the measuring signal 5 2 3 Amperometric principle The oxygen molecules diffused through the membrane are reduced to hydroxide ions OH at the cathode Silver is oxidised to silver ions Ag at the anode this forms a silver bromide layer AgBr A current flows due to the connected electrode release at the cathode and accepted at the anode In equilibrium this flow is proportional to the oxygen content of the medium This current is converted in the measuring instrument and indicated on the display as an oxygen concentration in mg l as a saturation index in SAT or as an oxygen partial pressure in hPa 5 3 Calibration Calibration is a means of adapting the transmitter to the characteristic values of the sensor As no zero calibration is required for the sensor a single point calibration is carried out in the presence of oxygen The sensor requires calibration after e first commissioning e replacing a membrane or elec
15. e 1 2 Installation commissioning and operation Please note the following items Installation electrical connection commissioning operation and maintenance of the measuring system must only be carried out by trained technical personnel The technical personnel must be authorised for the specified activities by the system operator Technical personnel must have read and understood these Operating Instructions and must adhere to them Before commissioning the entire measuring point check all the connections for correctness Ensure that electrical cables and hose connections are not damaged Do not operate damaged products and secure them against unintentional commissioning Mark the damaged product as being defective Measuring point faults may only be rectified by authorised and specially trained personnel If faults can not be rectified the products must be taken out of service and secured against unintentional commissioning Repairs not described in these Operating Instructions may only be carried out at the manufacturer s or by the service organisation 1 3 Operational safety The sensor has been designed and tested according to the state of the art and left the factory in perfect functioning order Relevant regulations and European standards have been met As the user you are responsible for complying with the following safety conditions Installation instructions Local prevailing standards and regulations 1 4 Retu
16. e or flow a second basin rim mounting must be used for the immersion assembly Floating body To aid installation in strongly fluctuating water levels e g in rivers or lakes there is a floating body OOA 110 50 available Fig 10 T1 INSTALLATION DOS41 1 Cable route with strain relief and rain protection Mounting ring for ropes and chains with locking 2 screw Lugs 15 3x120 for anchoring Saltwater resistant plastic float Pipe 40x1 rust proof steel SS 1 4571 5 AISI 316Ti Shock absorber and weight Oxygen sensor 4 Co o o i o D E G1 A 5 Dt eee d YY E Ra 7 C07 00841xxx 11 05 00 de 002 eps Fig 10 Floating body 3 4 2 Flow operation The OOA 250 A flow assembly Fig 11 with automatic self venting is suitable for use in pipelines or hose connections The inlet is at the bottom of the assembly the outlet at the top connection thread G 34 It can be installed in a pipe by using two 90 pipe brackets to allow inflow to the assembly Fig 12 Pos 6 mm inch 1 E e ES o a o9 H x o Sk 5 8 Y rl a La B100 003 547 8 a 100 3 94 pai 3 C07 00S41xxx 11 05 00 xx 009 eps S S i a 5 Fig 12 Bypass installation with manually C07 00S41xxx 11 05 00 de 008 eps Fig 11 Flow assembly OOA 250 A actuate
17. es follow the troubleshooting instructions or contact your sales office 26 00541 TROUBLE SHOOTING 9 3 Spare parts Position Spare parts kit order no 1 Sensor see product structure 2 Sealing ring OOY 31 OR on request Material Viton 3 pieces 3 Membrane cap on request Replacement cartridge OOY 31 WP for normal response time 2 preterminated replacement cartridges with pretensioned membrane 4 Membrane protection basket on request Electrolyte OOY 3 F on reques without 10 plastic ampoules transparent fig Polishing sheets OOY 3 PF on reques for gold cathode cleaning 10 pieces Zero solution on reques 3 units to produce 3 x 1 litre oxygen free solution 2 4 Accessories kit one of each on reques C07 00S41xxx 09 05 06 xx 001 eps Electrolyte OOY 3F Fig 20 OOS 41 Replacement cartridge OOY 31 WP for normal response time Sealing ring OOY 31 OR Polishing sheet OOY 3 PF 9 4 Return If the device requires repair please send it cleaned to the sales centre responsible Please use the original packaging if possible Please enclose the completed Declaration of contamination copy the second last page of these Operating Instructions with the packaging and the transportation documents No repair without completed Declaration of contamination 9 5 Disposal The device contains electronic components and must the
18. g alcohol Wait until polarisation time ends Recalibrate Check sensor if necessary send sensor in for repair Replace membrane cap Replace electrolyte Check electrical connection If the problem still occurs send the sensor in Send in the sensor for recoating Clean the gold cathode With a TOP 68 connection Humidity or Sensor calibrated Medium flow available Displayed value too low Displayesd temperature clearly too high Coating on the membrane Electrolyte soiled Cleaning of the TOP 68 plug in connection by using cleaning alcohol Recalibrate Create flow Check sensor if necessary send sensor in for repair Clean membrane or replace membrane cap Replace electrolyte Strong deviations in displayed value Q Note Make sure you comply with the instructions for troubleshooting in the Operating Instructions of the transmitter If necessary carry out a test of the transmitter Membrane visibly stretched Open sensor Dry electrodes transmitter display now at 0 EMC interference on the measuring Replace membrane cap Check electrical connection If the problem still occurs send the sensor in Remove outer screening of sensor and extension cable at terminal S Cut measuring and signalling lines from h v power lines 25 TROUBLE SHOOTING DOS41 9 2 Sensor checks Caution Only authorised and trained personnel may test the sensor You will al
19. g electrolyte OOY3 F into the membrane cap 9 Remove allthe air bubbles in the electrolyte by tapping the side of the membrane cap e g with a pencil 10 Hold the sensor body at an angle and carefully screw the membrane cap onto it down to the stop 11 Screw the protection basket back on Note After replacing the membrane cap polarise and recalibrate the sensor Then insert the sensor into the medium and check that no alarm is displayed on the transmitter 23 ACCESSORIES DOS41 8 Accessories 8 1 Connection accessories Junction box VBM for cable extension with 10 terminals IP 65 NEMA 4X Cable entry Pg 13 5 Order no 50003987 Cable entry NPT Y Order no 51500177 UMeasuring cable OYK 71 for use as extension cable between junction box VBM and transmitter sold by the metre OMeasuring cable with TOP 68 connector OOK 41 length 7 m 22 97 ft OOK 41 length 15 m 49 22 ft 8 2 Installation accessories Ulmmersion assembly OOA110 for sensor immersion in the basin PVC pipe resp PUR floating body with SS 1 4571 AISI 316Ti immersion tube UFlow assembly OOA250 for sensor installation in pipe lines PVC Ulmmersion assembly OYA611 for sensor immersion in basins open channels and tanks PVC Ulmmersion assembly OYY 105 for sensor immersion in basins SS 1 4404 AISI 316L pipe SS 1 4571 AISI 316Ti fitting OBasin rim holder OYY 106 for sensor immersion into the basin SS 1 4301 AISI 304
20. librate essen 20 Maintenance 21 Cleaning the sensor 21 Regenerating the sensor 22 Accessories 24 Connection accessories 24 Installation accessories 24 Measurement controlling and sensor cleaning 24 Trouble shooting 25 Trouble shooting instructions 25 Sensor checks 26 10 5 Spare parts a 27 Retuma e tdt 27 Disposal seinri a 27 Technical data 28 INP NA Ba ANG NGA tol Dad de 28 Performance characteristics 28 Environment 0 28 Process ed tado kae Kiana tas 28 Mechanical construction 28 IndeX iia 29 SAFETY INSTRUCTIONS 00541 1 Safety instructions 1 1 Designated use The oxygen sensor is suitable for continuous measurement of dissolved oxygen in water Typical applications are e Measuring oxygen content in activated sludge basins The measuring signal is used for monitoring and as a control parameter e Checking oxygen content in the outlet of a sewage treatment plant e Measuring and controlling the oxygen content in fish farming water Oxygen enrichment in drinking water Any other use than the one described here compromises the safety of persons and the entire measuring system and is therefore not permitted The manufacturer is not liable for damage caused by improper or non designated us
21. m used mark the appropriate hints AAAAA E LI LI LI radioactive explosive caustic poisonous harmful to biologically inflammable safe health hazardous Reason for return Company data Company Contact person Department Address Phone Fax e mail Your order no I hereby certify that the returned equipment has been cleaned and decontaminated acc to good industrial practices and is in compliance with all regulations This equipment poses no health or safety risks due to contamination Place date Company stamp and legally binding signature BA284e 00 04 04 Printed in Germany FM SGML 6 0 DT TTA 767 31508
22. medium again Note Make sure you comply with the instructions for calibration in the Operating Instructions of the transmitter 5 3 2 Calculation example for the calibration value As a check you can calculate the expected calibration value transmitter display as shown in the following example salinity is 0 1 Determine the sensor temperature ambient air the altitude above sea level the current air pressure rel air pressure to sea level at the time of calibration If undeterminable use 1013 hPa for an approximate calculation Define the saturation value S acc to the first table the factor K acc to the second table EG S mg l C S mg l C S mg l ES S mg l 0 14 64 11 10 99 21 8 90 31 7 42 1 14 23 12 10 75 22 8 73 32 7 30 2 13 83 13 10 51 23 8 57 33 7 18 3 13 45 14 10 28 24 8 41 34 7 06 4 13 09 15 10 06 25 8 25 35 6 94 5 12 75 16 9 85 26 8 11 36 6 83 6 12 42 17 9 64 27 7 96 37 6 72 7 12 11 18 9 45 28 7 82 38 6 61 8 11 81 19 9 26 29 7 69 39 6 51 9 11 53 20 9 08 30 7 55 40 6 41 10 11 25 OPERATION DOS41 Altitude K Altitude K Altitude K Altitude K m m m m 0 1 000 550 0 938 1050 0 885 1550 0 834 50 0 994 600 0 932 1100 0 879 1600 0 830 100 0 988 650 0 927 1150 0 874 1650 0 825 150 0 982 700 0 922 1200 0
23. nection via junction box To lengthen the sensor connection beyond the length of the fixed cable you require a junction box VBM Fig 15 Fig 16 The connection is lengthened to the transmitter using the special measuring cable OYK 71 O 2 O C07 00541xx0x 04 05 00 xx 002 eps Fig 14 Connection via junction box VBM 1 Sensor 2 Junction box 3 Extension cable 4 Transmitter WIRING DOS41 C07 00S41xxx 04 05 00 de 003 eps C07 00541xxx 04 05 00 de 004 eps Fig 15 Junction box VBM side view Fig 16 Junction box VBM top view 4 3 Post connection check Instrument status and specifications Remarks Are the sensor assembly junction box or cable damaged Visual inspection Electrical connection Remarks Does the supply voltage of the transmitter match the specifications 110 230 V AC on the nameplate 24V AC DC Are the installed cables strain relieved and not twisted Is the cable type route completely isolated Power cable weak current cable Are the power supply and signal cable correctly connected to the Use the connection diagram of transmitter OOM 2x3 Are all the screws terminals properly tightened Are all the cable entries installed tightened and sealed For cable entries lateral cable loops downwards for water to be able to drip off Are all the cable entries installed downwards
24. or lateral DOS41 OPERATION 5 Operation 5 1 Sensor design C07 00S41xxx 16 05 07 xx 001 eps Fig 18 Sensor head cutaway drawing 7 Membrane 8 Electrolyte 9 Anode 10 Threaded connection for protection basket 11 Sealing ring 12 Threaded connection for membrane cap 13 Membrane cap C07 00841xxx 03 05 00 xx 001 eps Fig 17 Sensor design Sensor cable Threaded connection NPT 34 Threaded connection G1 Sensor shaft Protection basket Gold cathode Membrane Electrolyte Anode 6 Gold cathode C07 00541xxx 16 05 03 xx 002 eps Fig 19 Sensor head top view OANDAA WH a The sensor consists of the following function units e Sensor shaft Fig 17 pos 4 e Sensor head with Gold cathode and anode Fig 18 Fig 19 e Membrane cap with electrolyte filling Fig 18 pos 13 and 8 e Protection basket Fig 17 pos 5 Note Alternatively to the protection basket you can use a spray head OOR 3 for use in immersed operation with cleaning function The membrane cap screwed onto the sensor head is filled with electrolyte The screw connection seals it from the medium The membrane which is in contact with the medium is pretensioned in the factory 15 OPERATION DOS41 5 2 Measuring principle 5 2 1 Polarisation When the sensor is connected to the transmitter a fixed external voltage is applied between the catho
25. r after 10 minutes Decide using the results a If the measured value is not at 102 2 SAT you have to calibrate the sensor b Otherwise double the length of time to the next inspection 2 Proceed as per Point 1 after two four and or eight months In this way you can determine the optimum calibration interval for your sensor Note Be sure to calibrate the sensor at least once a year 20 DOS41 MAINTENANCE 7 Maintenance Maintenance work must carried out at regular intervals To ensure that it is carried out we recommend you enter the maintenance dates into an operations logbook or in an operations calendar in advance The following activities must be carried out e Cleaning the sensor In particular when the membrane is soiled Check the measuring function 1 Remove the sensor from the medium Clean and dry the membrane After about 10 minutes measure the oxygen saturation index in air without recalibration The measured value should be near to 102 SAT display of O saturation with OOM 2x3 by pressing 4 times the key B 0o N Replace a defective membrane or one which cannot be cleaned any more Recalibration Note For regular automatic sensor cleaning we recommend equipping the measuring point with a fully automatic cleaning system 7 1 Cleaning the sensor The measurement can be corrupted by sensor fouling or malfunction e g Coatings on the sensor membrane m ca
26. refore be disposed of in accordance with regulations on the disposal of electronic waste Please observe local regulations 27 TECHNICAL DATA DOS41 10 Technical data 10 1 Input Measured value dissolved oxygen mg l SAT hPa Measuring range with OOM 223 253 0 05 20 00 mg l ppm 0 00 200 SAT 0 400 hPa 10 2 Performance characteristics Response time Too 3 minutes Tog 9 minutes each at 20 C Slope approx 300 nA at 20 C 1013 hPa Polarisation time 60 minutes Minimum flow rate typical 0 5 cm s for 95 measured value display Drift with permanent polarisation 1 6 per month Zero current zero current free Sensor monitoring with OOM 223 253 cable interruption or short circuit incorrect measurement and sensor passivation 10 3 Environment Storage temperature filled with electrolyte 5 50 C 23 122 F without electrolyte 20 60 C 4 140 F Ingress protection IP 68 10 4 Process Process pressure max 10 bar 145 psi permissible overpressure Underpressure operation is not permissible Process temperature 5 50 C 23 122 F 10 5 Mechanical construction Design dimensions see chapter Installation with cable length 7 m 22 97 ft 0 7 kg 1 5 Ib Weights with cable length 15 m 49
27. rn If the device requires repair please send it cleaned to the sales centre responsible Please use the original packaging if possible Please enclose the completed Declaration of contamination copy the second last page of these Operating Instructions with the packaging and the transportation documents No repair without completed Declaration of contamination DOS41 SAFETY INSTRUCTIONS 1 5 Notes on safety icons and symbols Warning A This symbol alerts you to hazards They can cause serious damage to the instrument or to persons if ignored Caution 5 This symbol alerts you to possible faults which could arise from incorrect operation They could cause damage to the instrument if ignored Note DN This symbol indicates important items of information IDENTIFICATION DOS41 2 2 1 Identification Product structure Cable length 2 Cable length 7 m 22 97 ft 4 Cable length 15 m 49 22 ft 8 Without Cable TOP 68 version only 9 Special design to customer specifications Cable connection F Fixed cable connection S Cable connection using TOP 68 plug OOS41 Complete order code 2 2 The following items are included in the delivery Oxygen sensor with transport protection cap for membrane protection Accessories Set with the following contents 2 replacement cartridges replacement membrane caps 10 plastic ampoules containing elect
28. rolyte Scope of delivery 1 sealing kit with 3 O rings 6 abrasive sheets Operating Instructions english If you have any questions please contact your supplier or your sales centre responsible DOS41 INSTALLATION 3 Installation 3 1 Incoming acceptance transport storage Make sure the packaging is undamaged Inform the supplier about damage to the packaging Keep the damaged packaging until the matter has been settled Make sure the contents are undamaged Inform the supplier about damage to the delivery contents Keep the damaged products until the matter has been settled Check that the scope of delivery is complete and agrees with your order and the shipping documents The packaging material used to store or to transport the product must provide shock protection and humidity protection The original packaging offers the best protection Also keep to the approved ambient conditions see Technical data If you have any questions please contact your supplier or your sales centre responsible 3 2 Installation conditions 3 2 1 Dimensions Fa A A pu To A 00 gx 2 o o NM o 9o co Ox C FT S y 7 dE x Jr T t t E Y Y Y rr So Hn MH Y v ov 040 1 57 mm inch 940 1 57 mm inch C07 OOS41xxx 06 05 00 en 001 eps C07 O0841xxx 0
29. s not used up The theoretical life of an electrolyte filling for use in air saturated drinking water at 20 C is max 5 years The electrolyte life is shortened by diffused dissolved gases such as H S NH or high concentrations of CO Particular loads occur with e anaerobic stages e g denitrification e strongly polluted industrial wastewater particularly at high temperatures 22 DOS41 MAINTENANCE Warning Risk of acid burns The electrolyte is strongly alkaline You must follow the appropriate occupational safety regulations Always wear protective gloves and goggles with handling electrolytes To replace the electrolyte proceed as follows 1 Remove the membrane cap 2 Replace the electrolyte and if necessary the membrane cap 3 Place the membrane cap back on the membrane body and screw the cap to the stop 7 2 4 Replacing the membrane cap Caution Please use for the OOS 41 sensor only the OOY 31 WP colour black membrane cap Removing the old membrane cap Remove the sensor from the medium Unscrew the protection basket Clean the outside of the sensor Unscrew the membrane cap If necessary clean the cathode or replace the sealing ring if it is damaged 00 45 Qo T9 zt Rinse the electrode holder with drinking water Installing the new membrane cap 7 Make sure that there are no dirt particles on the sealing surface 8 Fill the complete contents of a plastic ampoule containin
30. so require a multimeter voltage resistance Check Measure Setpoint Voltage inspection With the sensor connected test the polarisation voltage on the OOM 223 253 transmitter between terminals 90 and 91 650 mV Slope inspection Place the sensor in the air and dry with a paper towel After 10 minutes approx 102 SAT 4 times L Zero point inspection mmerse the sensor in zero solution Open the measuring chamber and dry he electrodes Display near to O mg l 0 Sat Temperature sensor check Disconnect the sensor and measure he resistance between red and brown flexible wires depending on temperature 5 C 74 4 ka 10 C 58 7 kQ 15 C 46 7 kQ 20 C 37 3 kQ 25 C 30 0 kQ 30 C 24 3 kQ Cable check Disconnect open and dry the sensor Measure the resistance between gold cathode and white braided wire Measure the resistance between anode and green braided wire lt 1 Q each 1 How to use the zero solution Fill a large beaker 1 5 2 I with approx 1 I of water Pour a cap full of the zero solution into the water Immerse the sensor into the water and wait a sufficient period of time 15 min for oxygen depletion The display drops to around O mg l O SAT Depending on the conditions contact surface water air the zero solution is stable for up to 12 hours Note If there are deviations from the reference valu
31. the spare parts which can be delivered as well as an overview of the system v Trouble shooting If faults occur during operation use the checklist to locate the cause v v Index You can find important terms and keywords on the individual sections here Use the keyword index to find the information you need quickly and efficiently DOS41 Table of contents m m m m cb o Roc NN N hu 9 1 9 2 Safety instructions 4 Designated use Installation commissioning and operation 4 Operational safety 4 Bet tti nae choke A e 4 Notes on safety icons and symbols 5 Identification 6 Product structure 6 Scope of delivery 6 Installation 7 Incoming acceptance transport storage 7 Installation conditions 7 Installation instructions 8 Installation examples 10 Post installation check 12 Wiring cerato DEO KANG 13 Direct connection to the transmitter 13 Connection via junction box 13 Post connection check 14 Operation 15 Sensor design lusus 15 Measuring principle 16 Calibration o 16 Commissioning 19 Function check 19 Polarisation essen 19 Ca
32. trolyte e cleaning the cathode e long breaks in operation without power supply e typical time intervals dependent on operating experience There are three basic types of calibration e in air preferably saturated water vapour e g near the water surface e in air saturated water by entering a reference measured value in the transmitter sensor remains in the medium Note Following only the calibration in air is discribed because it is the easiest and that s why the recommended method of calibration Calibration in air is only possible if air temperature gt 5 C DOS41 OPERATION 5 3 1 Calibration in air Remove the sensor from the medium 2 Clean the outside of the sensor with a damp cloth Then dry the sensor membrane e g by using a tissue 3 Ifthe sensor is removed from a closed pressure system with a process pressure greater than atmospheric pressure Open the membrane cap to equilibrate the pressure and clean the cap if necessary Replace the electrolyte filling and close the membrane cap again Wait for the polarisation time to end 4 Then wait while the sensor adjusts to the temperature of the ambient air This takes about 20 minutes Check that the sensor is not in direct sunlight during this time 5 Ifthe measured value display on the transmitter is stable carry out the calibration in accordance with the Operating Instructions of the transmitter 6 Place the sensor in the
33. use longer response times and a reduced slope Soiling or poisoning of the electrolyte causes longer response times and false measurement To ensure reliable measurement the sensor must be cleaned at regular intervals The frequency and intensity of the cleaning operation depend on the measuring medium Clean the sensor before every calibration at regular intervals during operation as necessary before returning it for repairs Depending on the type of soiling proceed as follows Type of soiling Cleaning Salt deposits Immerse the sensor in drinking water or in 1 5 hydrochloric acid for a few minutes Afterwards rinse it with copious amounts of water Dirt particles on the sensor body Clean the sensor body mechanically with water and a suitable not on the membrane brush Dirt particles on the membrane cap or Clean the membrane with water and a soft sponge the membrane Caution After cleaning rinse the sensor with copious amounts of clean water MAINTENANCE DOS41 7 2 Regenerating the sensor Parts of the sensor will suffer wear and tear during operation Suitable action can restore normal operating functionality This action includes Action Cause Cleaning the cathode soiled or plated cathode Replacing the sealing ring visual damage to the sealing ring Replacing the electrolyte unstable or implausible measuring signal or electrolyte soiling
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