Operating Instructions Dissolved oxygen sensor
Contents
1. C07 O0S41xxx 11 05 00 de 008 eps Fig 11 Flow assembly OOA 250 A Screw in part for sensor Screw ring Meter body Connection thread G34 Dummy plug connection for spray head COR 3 GAO NN Fig 12 DDAN C07 00S41xxx 11 05 00 xx 009 eps Bypass installation with manually actuated valves or solenoid valves Main line Medium return Oxygen sensor Manually actuated or solenoid valves Flow assembly OOA 250 A 90 pipe bracket Medium removal DOS31 INSTALLATION 3 43 Retractable assembly The assembly is designed for installation on tanks and pipes Suitable nozzles must be available for this Install the assembly at places with constant flow The minimum pipe diameter is DN 80 Detail A rotated 90 side view Detail A top view fo C07 O0A451 xx 1 1 07 00 en 001 eps Fig 13 Permissible and impermissible sensor installation positions 1 Ascending pipe best position 2 Horizontal pipe sensor top down impermissible due to air cushion or foam bubble forming 3 Horizontal pipe installation with permissible emitting angles acc to sensor version 4 Overhead installation impermissible due to missing electrolyte contact of the sensor electrodes 5 Down pipe impermissible Note e Do not install the assembly at places where air cushions or foam bubbles can be formed or where suspended particles can settle on the sensor optics gt Fi2. 25 Measurement controlling and cleaning 25 Membrane protection basket 25 Amperometric principle 17 Angle of installation 8 B Baffle plate o oooooooooommoooo 25 Basin rim holder oooooooo o 11 C Cable connection 31 Cable length 2c eee eee 31 Calibration 0 0 0 ccc eee 21 Calculating the calibration value 18 General RE re eee 17 Nai A Bioko arity 18 Chain assembly 0 00000 eevee 10 Checking Connection ded secre iaa 15 FUNGtIO Asaa L R da is 20 Installation o o ooooooooo o 13 Cleaning Gold cathode 00 eee 23 Senso a is es O a LANANG 22 Commissioning 000000 eee 4 20 D Designated use 0 4 DimensionS 0 000 eee eee ee eee 7 DISPOSAL si scsi tne A pad ett bag 29 Drite e As oa mated ah te N Seann aad ee OS 30 E Electrical connection Direct connection 14 Via junction box 0 eee ee eee 15 Environment 000 eee eee eee eee 30 EKKO Set area al Et anG ee eed 26 F Floating body a 12 Flow operation sass rierren 200 e eee eee eee 12 l CONS a a E BE EE IEE BS 5 Immersion operation o s aaaea aa 10 Incoming ACCEP aNncCe oooccooccc ee eee 7 OU unir BR As Bee ad 30 Installation o oooooooom ooo 4 7 8 Angle AA 8 A aa bka tama lg 13 Ex
3. o ooooooo 21 Maintenance 22 Cleaning the sensor 22 Regenerating the sensor 23 Accessories 25 Connection accessories 25 Installation accessories 25 Measurement controlling and sensor cleaning 25 Trouble shooting 26 Trouble shooting instructions 26 Sensor checks 27 10 5 Spare parts a 28 RETURN A o eae DS Ka RA mn 28 Disposal a 29 Technical data 30 INP e A NGA ana DAGA Dat 30 Performance characteristics 30 Environment 0 30 ie 30 Mechanical construction 31 INGOX o cdi 32 SAFETY INSTRUCTIONS oos31 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 e 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 use 1 2 Installation
4. OOK 31 length 15 m 49 22 ft 8 2 Installation accessories Olmmersion 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 ORetractable assembly OOA451 Manually driven retractable assembly stainless steel with ball valve for oxygen sensors Almmersion assembly OYA611 for sensor immersion in basins open channels and tanks PVC Almmersion assembly OOY 105 for sensor immersion in basins SS 1 4404 AISI 316L pipe SS 1 4571 AISI 316Ti fitting ABasin rim holder OOY 106 for sensor immersion into the basin SS 1 4301 AISI 304 ABaffle 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 0M00M223 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 25 TROUBLE SHOOTING DOS31 9 Trouble shooting 9 1 Trouble shooting instructions If any of the following problems occur test the measuring device as indicated Problem Check Remedial action No display no sensor reaction Mains voltage to the transmi
5. 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 e Installation instructions e Local prevailing standards and regulations 1 4 Return If the device re
6. 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 Star handle 5 Threaded coupling 5 6 DOS31 INSTALLATION 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 2 3 co o 3 Max 1400 55 12 e 5 1490 58 66 Tl UH e ni II NM 4 Q Tr 30 1 18 x 30 1 18 x 2 0 06 a v o 2 40 1 57 AIR NG ae DIN o 5 mere 5 8 co S Q O N AAN A Y 4x 12 0 42 150 5 91 mm inch C07 00S41xxx 11 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 KR MN 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 8 m 4 E 2 2 4 A 4 ko 3 3 C07 00841xxx 11 05 00 xx 005 eps C07 00S41xxx 11 05 00 xx 006 eps Fig 8 Horizontal basin ri
7. 7 2 4 Replacing the 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 E INO Tsk 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 containing electrolyte OOY3 F into the membrane cap 9 Remove all the 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 24 DOS31 ACCESSORIES 8 Accessories 8 1 Connection accessories OVS junction box with plug in socket and 7 pole plug for cable extension from sensor OOS 31 OOS 3 with SXP connector to transmitter IP 65 order no 50001054 QMeasuring cable OMK for use as extension cable between junction box VS and transmitter not terminated QMeasuring cable for sensors OOS 31 and OOS 71 with TOP 68 connector OOK 31 length 1 5 m 4 92 ft OOK 31 length 7 m 22 97 ft
8. A CC To A 00 JN lg o o NM o 9 o L V n T FT S J7 dE Y Jr T Y vt E y y y SS So HN MH Y v Y 040 1 57 mm inch i 40 1 57 mm inch C07 00S41xxx 06 05 00 en 001 eps C07 00S41xxx 06 05 00 en 002 eps Fig 1 Fixed cable version Fig 2 TOP 68 plug in head version INSTALLATION DOS31 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 e Oxygen sensor e Transmitter e g OOM223 253 e Special measuring cable e Assembly e g flow assembly OOA250 immersion assembly OOA110 o
9. Technical data o ooooooooo 30 Environment o 30 A O cnt A O 30 Mechanical construction 31 Performance characteristics 30 AA Oe tec le deen ES An Bet 30 Transport 7 U Upright post 0 6 0 2 eee eee eee 10 USO ares est ARN eet a Pei Pate a ake e 4 W Weigh secured Kuh pt DWAYNE ae Sade 31 Z Zero CUTRE AE A 30 33 DOS31 34 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 medium 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
10. 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 28 DOS31 TROUBLE SHOOTING 9 5 Disposal The device contains electronic components and must therefore be disposed of in accordance with regulations on the disposal of electronic waste Please observe local regulations 29 TECHNICAL DATA DOS31 10 Technical data 10 1 Input Measured value dissolved oxygen mg l SAT hPa Measuring range with OOM223 253 0 05 60 00 mg l 0 00 600 SAT 0 1200 hPa 10 2 Performance characteristics Response time e OOS31 XXX1 membrane cap for normal response time Too 3 minutes Tog 9 minutes each at 20 C e OOS31 XXX2 membrane cap for fast response time Too 0 5 minutes Tog 1 5 minutes each at 20 C Slope approx 300 nA at 20 C 1013 hPa Polarisation time lt 60 minutes Minimum flow rate for 95 of measured value display e OOS31 XXX1 typical 0 5 cm s e OOS31 XXX2 typical 2 5 cm s Drift with permanent polarisation lt 1 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
11. 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 BA285e 00 04 04 Printed in Germany FM SGML 6 0 DT 51506569
12. 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 30 00s31 TECHNICAL DATA 10 5 Mechanical construction Design dimensions see chapter Installation with cable length 7 m 22 97 ft 0 7 kg 1 5 lb Weights with cable length 15 m 49 22 ft 1 1 kg 2 4 lb with TOP68 plug in connection 0 3 kg 0 7 Ib Sensor shaft stainless steel 1 4571 AISI 316Ti Materials Membrane cap POM Cathode Gold Anode Silver Silver bromide Process connections G1 Cable entry sensor Fixed cable or TOP68 plug in connection Cable entry transmitter e SXP plug field device e Terminal connection panel mounted device Cable length incl extension cable max 100 m 328 1 ft including cable extension Temperature compensation NTC temperature sensor 30 kQ at 25 C 77 F 0 50 C 32 122 F Membrane thickness e 00S31 XXX1 approx 50 um e 00S31 XXX2 approx 25 um Q DOS31 Index A Accessories Baffle plate ooooooooooo 25 For cleaninQ ooooooooomomo 25 For CONNECtION o o o oooooooooo o 25 For installation
13. 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 DOS31 Table of contents m m m m cb aho NN N n 9 1 9 2 Safety instructions 4 Designated use Installation commissioning and operation 4 Operational safety 4 RETURN 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 13 WIND scott os 14 Direct connection to the transmitter 14 Connection via junction box 15 Post connection check 15 Operation 16 Sensor design aaa 16 Measuring principle 17 Calibration o 17 Commissioning 20 Function check 20 Polarisation oo ooooo o o 20 Calibrate
14. troubleshooting instructions or contact your sales office 9 3 Spare parts Position Spare parts kit order no 1 Sensor see product structure 2 Sealing ring OOY31 OR on request Material Viton 3 pieces Membrane cap on request Replacement cartridge OOY31 WP for normal response time 2 preterminated replacement cartridges with pretensioned membrane Membrane cap on request Replacement cartridge OOY31S WP for fast response time 2 preterminated replacement cartridges with pretensioned membrane 4 Membrane protection basket on reques Electrolyte OOY3 F On reques without 10 plastic ampoules transparent fig Polishing sheets OOY3 PF on reques for cathode cleaning C07 00841xxx 09 05 06 xx 001 eps _ 10 pieces Fig 20 OOS31 Zero solution on reques 3 units to produce 3 x 1 litre oxygen free solution Accessories kit OOY31 Z one of each on reques Electrolyte OOY3F Replacement cartridge OOY31 WP for normal response time Sealing ring OOY31 OR Polishing sheet OOY3 PF 2 4 Accessories kit OOY31 5 Z one of each on request Electrolyte OOY3F Replacement cartridge OOY31S WP for fast response time Sealing ring OOY31 OR Polishing sheet OOY3 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
15. with water and a soft sponge the membrane Caution After cleaning rinse the sensor with copious amounts of clean water 22 DOS31 MAINTENANCE 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 Replacing the membrane cap uncleanable membrane damaged membrane hole or overstretch AN Warning Before beginning regeneration switch off the power supply at the transmitter 7 2 1 Cleaning the 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 5 Caution The anode is covered with a silver bromide layer at the factory Do not clean the a
16. 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 58 20 9 08 30 7 55 40 6 41 10 11 25 DOS31 OPERATION 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 0 869 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 COMMISSIONING oos31 6 Commissioning 6 1 Function check Before first commissioning check if e the sensor is correctly installed e th
17. Operating Instructions 00S31 Dissolved oxygen sensor BA285e 00 04 04 06569 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 14 ff Page 16 Page 17 ff Page 17 ff Page 20 ff Page 22 ff Page 23 ff Page 28 Page 26 ff Page 32 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 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
18. TOP68 plug in connection Pin of Sensor with fixed cable OMK Sensor with TOP68 plug in head CYK71 00M223 x H Colour Assignment Colour Assignment 87 yellow Ug yellow Ug 0 grey OV white OV 96 pink NTC analogue or comm digital green Communication digital 97 blue NTC analogue or comm digital brown Communication digital 88 brown Up COAx Up inner 19 green Alarm 18 white Sensor signal DOS31 WIRING 4 2 Connection via junction box To lengthen the sensor connection beyond the length of the fixed cable you require a junction box VS Fig 15 Fig 16 Always connect the sensor cable with the SXP plug to the junction box The cable extension to the transmitter then depends from the transmitter version i e field device or panel mounted device 82 80 C07 00831xxx 04 05 00 de 001 eps Fig 15 Junction box VS to a field device 1 SXP plug to field device 3 2 SXP plug from sensor 4 4 3 Post connection check C07 00S31xxx 04 05 00 xx 002 eps Fig 16 Junction box VS to a panel mounted device 2 SXP plug from sensor Measuring cable OMK to the transmitter Connection department of the transmitter 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 transm
19. amples scaradar enera ien ik EN RE eee 10 Flow operation o o oocooccocoooccoco ooo 12 Immersion operation 10 Measuring point a 9 MG AA 8 Retractable assembly 13 M Maintenance 0 00 cee eee eee 22 Measuring point aasa uaaa 0 0 ee eee eee 9 Measuring principle o oo oooooo 17 Measuring system 0 20 eee eee o 8 Mechanical construction 31 Membrane iii ereta 0 000 eee eee eee 17 Membrane protection basket 25 O Operation reen nrenen 4 Operational Safety 4 Ordering information ooococcooccooo 6 P Performance characteristics 30 Polarisation ooooooooo momo 17 20 Processu oa e id 30 Product Structure suae sale a 6 R Regenerating o 23 Replacing Electrolyte o o oooooooooommomo 23 Membrane cap aa 24 Sealing ting coruna 23 Retractable assembly aa 13 RETURN Baan karag KAN na gaan da 4 28 S Salety ICONS mea nane u da LNG 5 32 DOS31 Scope of delivery aa 6 Sealing ring nanana 0 0 cece eee 23 Sensor CHECKS test Sandee heer bee DAA 27 Design 16 Dimensions 2a 7 Regenerating a na uaaa a 23 Spare parts 1 2 2 0 2 cece eee 28 A Mine AA MAAN ed on 7 Storage temperature 30 Symbols 2 EEN So aAa eee 5 T
20. brane cap Electrolyte soiled Replace electrolyte Strong deviations in displayed value Membrane visibly stretched Replace membrane cap Open sensor Dry electrodes transmitter display now at 0 Check electrical connection If the problem still occurs send the sensor in EMC interference on the measuring system Remove outer screening of sensor and extension cable at terminal S Cut measuring and signalling lines from h v power lines 26 DOS31 TROUBLE SHOOTING Problem Check Remedial action Membrane no longer sealed due to Replace membrane cap polarise damage and calibrate the sensor Membrane outside to outside not Screw membrane cap tight damaged If the alarm still occurs Separate sensor from transmitter for min 30 seconds Repeat once or twice if the alarm remains If the alarm still occurs replace Membrane breakage membrane cap polarise and alarm calibrate Sealing ring of membrane cap not clean Take the sensor from the medium clean and dry it Clean the sealing ring or replace it if it is damaged Separate sensor from transmitter for min 30 seconds Repeat once or twice if the alarm remains If the alarm still occurs send sensor in for repair 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 transmitt
21. ded in the delivery e Oxygen sensor with transport protection cap for membrane protection e Accessories Set with the following contents 2 replacement cartridges replacement membrane caps 10 plastic ampoules containing electrolyte 1 sealing kit with 3 O rings 6 abrasive sheets e Operating Instructions english If you have any questions please contact your supplier or your sales centre responsible DOS31 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
22. e 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 Bu oO N e Replace a defective membrane or one which cannot be cleaned any more e 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 e Coatings on the sensor membrane w cause longer response times and a reduced slope e 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 e before every calibration e at regular intervals during operation as necessary e 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
23. e 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 Place 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 e When you remove the sensor from the medium protect the sensor from strong sunlight e Make sure you comply with the instructi
24. ection basket Fig 17 pos 5 Q Note e Alternatively to the protection basket you can use a spray head OOR 3 optional see Accessories for use in immersed operation with cleaning function e The membrane cap screwed onto the sensor head is filled with electrolyte The screw connection seals it from the medium e The membrane which is in contact with the medium is pretensioned in the factory DOS31 OPERATION 5 2 Measuring principle 5 2 1 Polarisation When the sensor is connected to the transmitter a fixed external voltage is applied between the cathode 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 equ
25. er 9 2 Sensor checks Caution Only authorised and trained personnel may test the sensor You will also require a multimeter voltage resistance Check Measure Setpoint With the sensor connected test the between terminals 87 and 0 8 V Voltage inspection operating voltage on the OOM 223 253 between terminals 88 and 0 8 V transmitter A i Place the sensor in the air and dry with After 10 minutes Slope inspection a paper towel approx 102 SAT 4 times 4 Immerse the sensor in zero solution Display near to O mg l 0 Sat Zero point inspection Open the measuring chamber and dry the electrodes Disconnect the sensor and measure depending on temperature the resistance 5 C 74 4 ka Temperature sensor between TOP68 pins 3 and 4 i 10 C 58 7 kQ check between SXP pins 3 and 4 with fixed 15 C 46 7 KQ cable version 20 C 37 3 kQ 25 C 30 0 kQ 30 C 24 3 kQ 1 How to use the zero solution 1 Fill a large beaker 1 5 2 I with approx 1 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 27 TROUBLE SHOOTING oos31 DN Note If there are deviations from the reference values follow the
26. g 13 e Measuring errors can occur if the sensor is not immersed into the medium suspended particles are settled on the sensor membrane the sensor is installed overhead 3 5 Post installation check e Check the membrane for leak tighness und replace it if necessary e Compliance with permissible sensor installation position e Is the sensor installed to an assembly and is not suspended from the cable e Avoid moisture by rain by fitting the protective cap to the immersion assembly 13 WIRING DOS31 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 Ensure that there is no voltage at the power cable before beginning the connection work 4 1 Direct connection to the transmitter The sensor connection is different acc to the transmitter version e Field device OOM253 Connect the sensor directly to the transmitter by using the special measuring cable with SXP plug C07 00S41xxx 04 05 00 xx 001 eps Fig 14 SXP plug e Panel mounted device OOM223 Please remove the SXP plug transmitter side from the cable Take out the cable specification and the corresponding pins of OOM223 from the following table Please note that the cable specification differs acc to the sensor version fixed cable or
27. ilibrium 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 electrolyte 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 OPERATION DOS31 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 If the sensor is removed from a closed pressure system with a process pres
28. itter match the specifications 110 230 V AC on the nameplate 24 V 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 transmitter Use the connection diagram of OOM 2x3 Are all the screws terminals properly tightened Are all the cable entries installed tightened and sealed Are all the cable entries installed downwards or lateral For cable entries lateral cable loops downwards for water to be able to drip off 15 OPERATION oos31 5 Operation 5 1 Sensor design C07 00S41xxx 16 05 07 xx 001 eps Fig 18 Sensor head cutaway drawing 4 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 008371xx 03 05 00 xx 001 eps Fig 17 Sensor design Sensor cable Threaded connection G1 Sensor shaft Protection basket Cathode ee Fig 19 Sensor head top view Anode 6 Cathode C07 00S41xxx 16 05 03 xx 002 eps O DNOG AA Wa The sensor consists of the following function units e Sensor shaft Fig 17 pos 4 e Sensor head with cathode and anode Fig 18 Fig 19 e Membrane cap with electrolyte filling Fig 18 pos 13 and 8 e Prot
29. m 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 turbulence or flow a second basin rim mounting must be used for the immersion assembly T1 INSTALLATION DOS31 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 o i O ta n o Q i i G1 A 5 e YY A 7 C07 00S41xxx 11 05 00 de 002 eps Fig 10 Floating body 3 4 2 Flow operation OQ AK amp N Oo Cable route with strain relief and rain protection Mounting ring for ropes and chains with locking screw Lugs 15 3x120 for anchoring Saltwater resistant plastic float Pipe 40x1 rust proof steel SS 1 4571 AISI 316Ti Shock absorber and weight Oxygen sensor 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 I con EET eae 034 1 34 34 196 7 72 roa 68 2 68 G A 0 3 54 100 3 94
30. nd installation equipment comply with national grounding regulations INSTALLATION DOS31 3 4 Installation examples 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 O S eee E eo 3 E i I x 2 2 Its max 1400 55 12 2 T j o a 1480 58 27 1500 59 06 40 1 57 950 37 40 1630 64 17 1580 64 20 25 0 98 N Ng T Lal 5 e LO To I 1 a O s N N Boi g a TY Q z A A o KA YY EG 4 150 591 Ko mm inch mm inch C07 O0S41xxx 11 05 00 en 002 eps C07 O0S41xxx 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
31. node 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 is 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 23 MAINTENANCE DOS31 A 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
32. ons for commissioning and calibration in the Operating Instructions of the transmitter 20 DOS31 COMMISSIONING 6 3 Calibrate Calibrate the sensor Calibration in air Page 18 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 air 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 Q Note Be sure to calibrate the sensor at least once a year MAINTENANCE DOS31 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 e Check the measuring function 1 Remove the sensor from the medium Clean and dry the membran
33. quires 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 DOS31 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 DOS31 2 2 1 Certificate A Identification Product structure Ex free version Cable length Cable length 1 5 m 4 92 ft Cable length 7 m 22 97 ft Cable length 15 m 49 22 ft Without Cable TOP 68 version only Special design to customer specifications own AN O Cable connection F Fixed cable connection S Cable connection using TOP 68 plug Membrane cap 1 OOY31 WP membrane cap minimum flow rate 5 mm s for normal response time 2 OOY31 S WP membrane cap minimum flow rate 25 mm s for fast response time 00S31 Complete order code 2 2 Scope of delivery The following items are inclu
34. r retractable assembly OOA451 Optional e Universal suspension assembly support OOH 101 for immersed operation e Junction box VS with cable extension e Automatic spray cleaning system DOS31 INSTALLATION C07 00871xxx 14 05 00 xx 001 eps Fig 4 Measuring system example 1 Flow assembly 2 Junction box VS optional 3 Transmitter OOM253 4 Oxygen sensor 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 e 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 e Screw the sensor into the assembly so that the cable is not twisted e Avoid exerting excessive tensile force on the cable e g from jerky pulling e Select the installation location so that there is easy access for later calibration Warning When using metallic assemblies a
35. sure 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 If the 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 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 T 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 C S mg l C S mg l C S mg l C 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 ng 8 57 33 7 18 3 13 45
36. tter Connect mains voltage Sensor connected correctly Set up correct connection Medium flow available Create flow Coating on the membrane Clean the sensor Electrolyte in the measuring chamber Fill with electrolyte or replace electrolyte Displayed value too high With a TOP 68 connection humidity or dirt in plug Cleaning of the TOP 68 plug in connection by using cleaning alcohol Polarisation complete Wait until polarisation time ends Last calibration with different sensor Recalibrate Temperature display clearly too low Check sensor if necessary send sensor in for repair Membrane visibly stretched Replace membrane cap Electrolyte soiled Replace electrolyte Open sensor Dry electrodes transmitter display now at 0 Check electrical connection If the problem still occurs send the sensor in Anode coating dissolved is the anode silver instead of brown Send in the sensor for recoating Cathode silver plated Clean the cathode Displayed value too low With a TOP 68 connection Humidity or dirt in plug Cleaning of the TOP 68 plug in connection by using cleaning alcohol Sensor calibrated Recalibrate Medium flow available Create flow Displayesd temperature clearly too high Check sensor if necessary send sensor in for repair Coating on the membrane Clean membrane or replace mem
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