Operating Instructions Dissolved oxygen sensor
Contents
1. 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 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 Altitud K Altitud K Altitud K Altitud K e m e m e m e 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 current air pressure in bar 1013 hPa 1 013 bar if unknown 4 Calculate the calibration value C C S K L Example Air calibration at 18 C altitude 500 m above sea level current air pressure 1009 hPa 1 009 bar e 29 45 mg l K 0 943 L 1 009 Calibration value C 9 17 mg l COMMISSIONING oos61 6 Commissioning 6 1 Function check Before fi2. 70 and 130 SAT result in the calibration of the measured value at air Measured smaller than 15 96 SAT result in the calibration of the zero point Air saturated water Like air calibration DEVICE DESCRIPTION oos61 Reference measured value entry at transmitter sensor remains in the medium Measured values between 50 and 150 96 SAT result in the calibration of the measured value to the reference value while maintaining the zero point Measured values smaller than 20 96 SAT result in the calibration of the measured value to the reference value while maintaining the measured value at air If necessary calibrate Inthe air water vapor saturated type of calibration in order to calibrate the measured value at air n the air saturated water type of calibration but while using oxygen free water see Sensor check section to calibrate the zero point 5 3 2 Calibration intervals 1 If you want to calibrate the sensor in the meantime due to a special application and or a special type of installation you can determine the intervals with the following method 2 Checkthe 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 100 2 SAT you have to calibrate the sensor b Otherwise double the length of time to the next inspection 3
3. 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 5 3 3 Calibration in air 1 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 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 4 If the measured value display on the transmitter is stable carry out the calibration in accordance with the Operating Instructions of the transmitter 5 Place the sensor in the medium again Q Note Make sure you comply with the instructions for calibration in the Operating Instructions of the transmitter 5 3 4 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 O 1 Determine the sensor temperature ambient air the altitude above sea level the current air pressure zrel air pressure to sea level at the time of calibration If undeterminable use 1013 hPa for an approximate calculation 2 Define the saturation value S acc to the first table the factor K acc to the second table Dose1l DEVICE DESCRIPTION
4. sections here Use the keyword index to find the information you need quickly and efficiently DOSse 1 Table of contents Safety instructions 4 Designated use Installation commissioning and operation 4 Operational safety 4 Returne 2 2 puse ere mid x Ies 5 Notes on safety icons and symbols 5 Cross reference symbols 5 Identification 6 Product structure 004 6 Scope of delivery 20 5 6 Installation 7 Incoming acceptance transport storage 7 Installation conditions 7 Installation instructions 8 Installation examples 10 Post installation check 13 WING o ose ERG REC ER EU 14 Direct connection to the transmitter 14 Connection via junction box 14 Post connection check 15 Device description 16 Sensor design llusuus 16 Measuring principle 17 Calibration 0 0 0 0 ee ee 17 Commissioning 20 Function check 000 eee 20 Calibration 0 0 0 0 eee 20 Maintenance 21 Cleaning the sensor 21 Regenerating 000 eee ee eae 22 Accessories 23 Connection accessories 23 Installation accessories 23 Measuring monitori
5. 1 1 Field installation Connect the sensor directly to the transmitter by means of the special measuring cable with the SXP connector Pal 14 30004118 Fig 14 SXP connector 4 1 2 Panel mounting Remove the SXP connector transmitter side from the cable Refer to the following table for the cable assignment and the assigned terminals for OOM223 WX WS Please note that the cable assignment changes depending on the sensor version fixed cable or TOP68 connection Terminal Sensor with fixed cable OMK Sensor with TOP68 connection CYK71 COM223 7 Core Assignment Core Assignment 85 Yellow Ug Yellow Ug 0 Gray OV White 0v 96 Pink Comm digital Green Communication digital 97 Blue Comm digital Brown Communication digital 88 Brown Usg Coax Ug inner 4 2 Connection via junction box To extend the sensor connection beyond the length of the fixed cable the connection has to take place using a junction box VS gt ze 15 gt ze 16 Always connect the sensor cable to the junction box with the SXP connector The extension to the transmitter depends on the transmitter version i e field device or panel mounted instrument DEVICE DESCRIPTION oos61 5 Device description 5 1 Sensor design 1 n o o 20004151 Fig 17 Sensor design Sensor cable Sens
6. Operating Instructions Dissolved oxygen sensor BA387e 00 06 05 07927 Brief overview Here is how to use these Operating Instructions to commission your sensor quickly and safely Id mp my ol Ld mp my o 16 17 17 m pn uy bid gt 224 gt B29 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 and Note amp 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 these 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 Maintenance Regular maintenance tasks such as cleaning the sensor are absolutely essential and prolong the operating time of the sensor Here you can find an overview of the spare parts which can be delivered as well as an overview of the system v Troubleshooting 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
7. SAT hPa Temperature C F 10 1 2 Measuring range with OOM 223 253 0 20 mg l 0 200 SAT 0 400 hPa 10 2 Environment 10 2 1 Storage temperature 20 70 C at 95 relative air humidity not condensing 10 2 2 Ambient temperature range 5 50 C 10 2 3 Degree of protection IP 68 10 3 Process 10 3 1 Process pressure Max permitted overpressure 10 bar 10 3 2 Process temperature 20 60 C 10 4 Performance characteristics 10 4 1 Response time tgo 60 S 10 4 2 Maximum measured error 2 of end of measuring range TECHNICAL DATA Dosel 10 4 3 Repeatability 0 5 96 of end of measuring range 10 4 4 Operating life of sensor cap 1 year protect against direct sunshine 10 5 Mechanical construction 10 5 1 Weights For cable length 7 m 23 ft 0 7 kg 1 5 Ibs For cable length 15 m 49 ft 1 1 kg 2 4 Ibs With TOP68 connection 0 3 kg 0 66 Ibs 10 5 2 Materials Sensor shaft Stainless steel 1 4571 AISI 316Ti Cap with fluorescence layer POM Fluorescence layer Silicone 10 5 3 Process connection G1 10 5 4 Sensor cable Shielded 7 core fixed cable or double shielded coaxial cable with 4 pilot wires for TOP68 connection 10 5 5 Cable connection to transmitter SXP connector field device Terminal connection panel mounted instrument 10 5 6 Maximum cable length Max 100 m 328 ft including cable extension 10 5 7 Temperature co
8. ble process connection Other angles and overhead installation are not recommended Reason possible sediment formation and resulting falsification of measured value 80004087 Fig 3 Angle of installation A Recommended angle of installation 0 180 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 Mounting location Select the installation location so that there is easy access for later calibration Make sure that upright posts and assemblies are secured safely and vibration free 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 Transmitter Special measuring cable if extension necessary Assembly Optional e ssembly holder for immersed operation Junction box with cable extension Automatic spray cleaning system DOSse 1 INSTALLATION 3 4 8 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 a0004117 en Fi
9. ch the marker molecules As a result the response signals are shorter and less intense Measurement result The sensor returns a signal that is in proportion to the oxygen concentration in the medium The fluid temperature and air pressure are already calculated in the sensor 5 2 2 Fluorescence cap The oxygen dissolved in the medium is diffused into the fluorescence cap Suitable flow is not necessarily mandatory but it does improve the speed at which the measuring system responds and ensures a more representative measured value compared to a measurement in static medium The cap 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 3 Calibration Calibration is a means of adapting the transmitter to the characteristic values of the sensor Normally sensor calibration is seldom necessary It is necessary after Changing the fluorescence cap Within the framework of system monitoring and supervision for example the calibration can also be cyclically monitored at typical time intervals depending on operating experience or renewed Note Ideally use the calibration vessel see Accessories for calibration 5 3 1 Types of calibration Types of calibration Air preferably saturated water vapor e g near the water surface Measured values between
10. g 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 installation angle acc to sensor version 4 Overhead installation critical due to possible sediment buildup on fluorescence cap 5 Down pipe impermissible Note 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 el 13 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 Sensor and cable undamaged Fluorescence cap undamaged Compliance with permissible sensor installation position Is the sensor installed in an assembly and is not suspended from the cable Avoid moisture by rain by fitting the protective cap to the immersion assembly WIRING DOSse 1i N 4 Wiring Warning The electrical connection must only be carried out by an electrical technician The electrical technician 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 4
11. mpensation Internal 10 5 8 Interface RS 485
12. ng and cleaning 23 Troubleshooting 24 Troubleshooting instructions 24 Sensor checks 000000 e eee 24 Spare parts 9 4 9 5 10 10 1 10 2 10 3 10 4 10 5 Retur eee nthe MI dit meret RADI HO b aet dt 25 Disposal rtm 26 Technical data 27 Input ese vet dei Rh eke 4 27 Environment sse 27 PFOCESS eue deinem heran uy ias 27 Performance characteristics 27 Mechanical construction 28 Index iiu tae Meee ees 29 SAFETY INSTRUCTIONS Dose 1l 1 Safety instructions 1 1 Designated use The oxygen sensor is suitable for continuous measurement of dissolved oxygen in water Typical applications are Measuring monitoring and regulating the oxygen content in activated sludge basins Monitoring the oxygen content in the sewage treatment plant outlet Monitoring measuring and regulating the oxygen content in public waters and fish farming water Monitoring of 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 commissioning and operation Please note the following items Installation electrical connection commissioning operation and maintenance of the measuring system must only be carried out b
13. or shaft O ring Protection guard Threaded connection Detector Emitter diode Fluorescence cap Oe O0O04A4 QW The sensor consists of the following function units Sensor shaft Sensor head with optics emitter and detector Fluorescence cap Protection guard Q Note Alternatively to the protection guard you can use a spray head OOR 3 optional see Accessories for use in immersed operation with cleaning function DOSse 1 DEVICE DESCRIPTION 5 2 Measuring principle 5 2 1 Oxygen measurement based on the principle of fluorescence quenching Sensor design Oxygen sensitive molecules markers are integrated in an optically active layer fluorescence layer The surface of the fluorescence layer is in contact with the medium The sensor optics are directed at the underside of the fluorescence layer There is an equilibrium between the oxygen partial pressure in the medium and that in the fluorescence layer f the sensor is immersed in the medium the equilibrium is established very quickly Measuring process The sensor optics send green light pulses to the fluorescence layer The markers answer fluoresce with red light pulses The duration and intensity of the response signals is directly dependent on the oxygen contents and the partial pressure If the medium is free from oxygen the response signals are long and very intense Oxygen molecules quen
14. rst commissioning check if the sensor is correctly installed the electrical connection is correct If using an assembly with automatic cleaning check the correct water connection at the assembly rinse connection N 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 Calibration The sensor is calibrated at the factory A new calibration is only needed in special situations DOSse 1 MAINTENANCE 7 Maintenance Maintenance work must be 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 maintenance cycle primarily depends on the system the installation conditions and the medium in which measurement is taking place The following activities must be carried out e Cleaning the sensor e Check the measuring function 1 Remove the sensor from the medium 2 Clean and dry the membrane 3 After about 10 minutes measure the oxygen saturation index in air without recalibration 4 The measured value should be at 100 4 SAT f necessary replace a defective membrane or one which cannot be cleaned any more Recalibration if desired or required 7 1 Cleaning the sensor The measurement can be corrupted b
15. tion copy the second last page of these Operating Instructions with the packaging and the transportation documents No repair without completed Declaration of contamination 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 Wi This symbol alerts you to possible faults which could arise from incorrect operation They could cause damage to the instrument if ignored Note Bw This symbol indicates important items of information 1 6 Cross reference symbols 1 This symbol stands for a cross reference to a specific page e g Page 1 e 2 This symbol stands for a cross reference to a specific graphic e g Fig 2 IDENTIFICATION oos61 2 Identification 2 1 Product structure Certificate A Version for non hazardous area Cable length incl extension cable Cable length 1 5 m 4 9 ft Cable length 7 5 m 23 ft Cable length 15 m 49 ft No cable for replacement for TOP 68 version Special version upon request o ono Sensor head F Thread G1 fixed cable with SXP connector S Thread G1 TOP68 connector Accessories 0 Without accessories OOS61 Complete order code 2 2 Scope of delivery The following items are included in the delivery Oxygen sensor with transport protection cap for membrane protection Operating Instruc
16. tions English If you have any questions please contact your supplier or your sales center responsible DOSse 1 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 center responsible 3 2 Installation conditions 3 2 1 Dimensions 00 A mo G M 3 9 Q N o N Su o E 9 N Y Y 040 1 57 040 1 57 E 3 a0004083 en a0004084 en Fig 1 Fixed cable version Fig 2 TOP 68 plug in head version INSTALLATION DOSse 1 3 2 2 Orientation The sensor can be installed up to the horizontal in an assembly support or a suita
17. y sensor fouling or malfunction e g Buildup on the fluorescence cap gt causes longer response times and a reduced slope under certain circumstances 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 1 596 hydrochloric acid for a few minutes Afterwards rinse it with copious amounts of water Dirt particles on the sensor body not cap Clean the sensor body mechanically with water and a suitable brush Dirt particles on the fluorescence cap Clean the membrane with water and a soft sponge Caution After cleaning rinse the sensor with copious amounts of clean water 7 1 1 Cleaning the optics The optics only need to be cleaned if medium has penetrated through a defective fluorescence cap To clean it proceed as follows 1 Unscrew the protection guard and fluorescence cap from the sensor head 2 Carefully clean the optical surface with a soft cloth until the buildup is fully removed DOSse 1 TECHNICAL DATA 10 Technical data 10 1 Input 10 1 4 Measured value Dissolved oxygen mg l
18. y trained technical personnel The technical personnel must be authorized 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 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 authorized and specially trained personnel If faults cannot 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 organization 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 Dosel SAFETY INSTRUCTIONS 1 4 Return If the device requires repair please send it cleaned to the sales center responsible Please use the original packaging if possible Please enclose the completed Declaration of contamina
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