IQ SensorNet NitraVis Sensor User Manual
Contents
1. 3 1 3 3 Installation e ead e 0000 3 2 3 3 1 Mounting the sensor 5 3 2 3 3 2 Mounting the shock protectors 3 4 3 3 3 Connecting the sensor to the IQ SENSOR NET 3 5 3 4 Initial commissioning llle 3 7 3 4 1 General information 3 7 240 2 SeHgs oo Reed ed aa EX Pes RS 3 8 Measuring Operation slllsu un 4 1 4 1 Determination of measured values 4 1 4 2 Measuring operation 202020005 4 2 4 3 Calibration llse IIR 4 3 4 3 4 Overview 0 00 eee 4 3 4 3 2 User calibration 20 4 5 4 3 3 Sensor check Zero adjustment 4 8 ba75950e02 11 2012 NitraVis 70x IQ 5 Maintenance and cleaning 5 1 5 1 Maintenance der xu ia das 5 1 5 2 Sensor cleaning 000 cece eee eee ees 5 1 5 2 1 Cleaning agents and accessories 5 1 5 2 2 General steps to be taken 5 2 5 2 3 Basic Cleaning sue ioc s tn IPS anaes oe 5 3 5 2 4 Cleaning the measuring gap 5 4 6 Spare parts maintenance equipment accessories 6 1 T MWhabiodoi exu priu eru EIE XE 7 1 8 Technical data ost b ieee ot eae ants 8 1 8 1 Measurement characteristics 4 8 1 8 2 Application conditions 00000 aes 8 2 83 Generaldata 0 00 ees 8 3 8 4 Electrical data2. Use other cleaning method Select different measurement location Setlonger cleaning duration Set more frequent cleaning procedures Install optional compressed air cleaning device Failure of the optional com pressed air cleaning system Clean the measurement win dows section 5 2 4 Check all components of the compressed air cleaning sys tem compressor compressed air line UV VIS sensor rinsing openings Substantial change of test sample sample matrix Cause Carry out new user calibration Remedy Measuring range exceeded Check process Foreign matter in the measur ing gap Clean the measuring gap sec tion 5 2 3 Erroneous user calibration Cause Repeat user calibration Make sure the samples for compari Son are representative Remedy Gas bubbles in front of the measurement windows Check the position within the process and the installation position ba75950e02 11 2012 NitraVis 70x IQ What to do if Measured values too low Display of ERROR or too high Cause Remedy Gas bubbles in front of the measurement windows Check the installation position of the sensor Measurement windows dirty Cause Clean the measurement win dows Remedy UV VIS sensor not correctly connected Check the assignment of the terminal co
3. Atleast one value is outside the measur ing range ts and structure of the log book and how you can call it up is given in the LOG Book chapter of the IQ SENSOR NET system operating manual The user calibration is not recorded in the calibration history You can however view the current value pairs in the Settings of sensors and diff sensors menu at any time ba75950e02 11 2012 Measuring Operation NitraVis 70x IQ Ultrapure water H20 dist Storage location of the Zero adjustment data Steps 4 3 3 Sensor check Zero adjustment Note The sensor check or Zero adjustment must be carried out under abso lutely clean conditions If you do not work carefully enough the Zero ad justment can deteriorate the measuring quality As ultrapure water exclusively use distilled or deionized water that is suitable for analysis purposes Especially make sure that the concen tration of metrologically relevant substances nitrate is negligible The data of the sensor checks are not stored The data of the user zero adjustment are stored in the sensor A successful Sensor check H2O dest is the prerequisite for a valid user calibration After each Sensor check H2O dest the sensor is evaluated A changed sensor evaluation proves that the cleaning was effective The steps of the sensor check or Zero adjustment are identical except for the used check solutions ultrapure water or standard solution and are des
4. a xylem brand Operating manual IQ SENSOR NET NitraVis 70x IQ NitraVis 701 IQ Optical sensor for the NitraVis 705 IQ spectral determination of nitrate ba75950e02 11 2012 NitraVis 70x IQ For the most recent version of the manual please visit il www ysi com Contact YSI 1725 Brannum Lane Yellow Springs OH 45387 USA Tel 1 937 767 7241 800 765 4974 Email environmental ysi com Internet www ysi com Copyright 2012 Xylem Inc ba75950e02 11 2012 NitraVis 70x IQ Contents NitraVis 70x IQ Contents OVEIVIEW vo Vu scc ree ene et eh Beeb ees 1 1 1 14 How to use this component operating manual 1 1 1 2 Fields of application 2020005 1 2 1 3 Measuring principle of the UV VIS sensor 1 2 1 4 Structure of the UV VIS sensor 1 3 Safely 22 ues pao khoe Scars iet e A uote esee cce gea cn 2 1 2 1 Safety information 2 5 L0 yekX se aXek EXE 2 1 2 1 1 Safety information in the operating manual 2 1 2 1 2 Safety signs on the product 2 1 2 1 3 Further documents providing safety information 2 1 2 2 Safe operation 0 000 2 2 2 2 1 Authorized use 2 2000005 2 2 2 2 2 Requirements for safe operation 2 2 2 43 Unauthorized use suus 2 2 COMMISSIONING 5255 eel RET RENEW T 3 1 3 1 IQ SENSOR NET system requirements 3 1 3 2 Scope of delivery of the NitraVis 70x IQ
5. illii 8 4 9 IdBXeS auccosreieiuu eeu Xu M HE WERE EL 9 1 9 1 Explanation of the messages 05 9 1 9 1 1 Error messages elles 9 2 9 1 2 Infomessages leeess elles 9 4 9 2 Status info a a ees 9 5 10 Appendix Glossary 0000 c eee eee eee 10 1 11 Contact Information 11 1 11 1 Ordering amp Technical Support 11 1 11 2 Service Information 00 cece ee eee 11 1 ba75950y01 11 2012 NitraVis 70x IQ Overview Overview How to use this component operating manual 1 1 1 Structure of the IQ SENSOR NET operating manual IQ Sensor Net Operating Manual System Operating Manual Ring Binder IQ Sensor Operating Manual MIQ Module Operating Manual MIQ Terminal Operating Manual Component Operating Manuals Fig 1 1 Structure of the IQ SENSOR NET operating manual The IQ SENSOR NET operating manual has a modular structure like the IQ SENSOR NET itself It consists of a system operating manual and the operating manuals of all the components used Please file this component operating manual into the ring binder of the system operating manual ba75950e02 11 2012 Overview NitraVis 70x IQ Measuring location Ultrasound cleaning system
6. 1725 Brannum Lane Yellow Springs OH 45387 USA Internet www ysi com When placing an order please have the following information available YSI account number if available Name and Phone Number Model number or brief description Billing and shipping address Quantity Purchase Order or Credit Card 11 2 Service Information YSI has authorized service centers throughout the United States and Internationally For the nearest service center information please visit www ysi com and click Support or contact YSI Technical Support directly at 800 897 4151 When returning a product for service include the Product Return form with cleaning certification The form must be completely filled out for an YSI Service Center to accept the instrument for service The Product Return form may be downloaded at www ysi com and clicking on the Support tab ba75950e02 11 1 Contact Information NitraVis 70x IQ 11 2 ba75950e02 11 2012
7. 4 3 2 User calibration The adjustment is carried out at one or two points within the measuring range A value pair is determined at each point Each value pair consists of the raw value of the UV VIS sensor and the corresponding reference value Each value pair has to be determined at the same time and place as the test sample as possible At the time of the calibration the test sample should be in a condition that is typical of the application If the required accuracy is low the default setting of the first value pair can be adopted unchanged The first value pair is equivalent to the zero point in this case The second value pair should be close to the working point of the application This method results in a single point calibra tion If the application has to cover a wide value range with high measuring accuracy both value pairs should be used for calibration When doing So the calibration value pairs should be determined and input at the limits of the application range as possible You obtain samples of different concentrations e g by taking two samples during clearly different conditions of the plant dry period and rain period The measurement results will be ever more accurate the closer the composition of the test sample corresponds to the status at the time of the calibration If there is a fundamental change of the characteristics of the sample a new calibration may be necessary The calibration data of the user cal
8. Compressed air cleaning option 1 2 Fields of application The NitraVis 70x IQ is an online sensor for the on site determination of nitrate and total suspended solids TSS in waste water treatment plants The range of application comprises control feedback control and mon itoring NitraVis 701 IQ Aeration tank or inlet NitraVis 705 IQ Outlet The ultrasound cleaning system ensures low maintenance and long term reliable measurement operation The ultrasound source integrated in the sensor excites the measure ment windows to produce vibrations in the ultrasound range The movement of the surface as a result of this prevents the growth of pollution in almost all cases and thus ensures reliable measured values during continuous operation The sensor is designed to be equipped with an additional compressed air driven cleaning system which supports the ultrasound cleaning system as necessary 1 3 Measuring principle of the UV VIS sensor The UV VIS sensor operates according to the measuring principle of UV VIS spectrometry Any substance contained in a measuring solution attenuates a light beam that penetrates the measuring solution The attenuation absor bance of the light beam is measured for different wavelengths The wavelength dependent distribution produces the absorbance spec trum The wavelength range where an absorbance occurs is characteristic of the substance The extent of the absorbance depends on the amo
9. ascending order Operational voltage too low Check installation and cable lengths Follow installation instructions Power supply module s overloaded add power supply module s Check terminal and module connections Defective components replace components Operational voltage too low no operation possible Check installation and cable lengths Follow installation instructions Power supply module s overloaded add power supply module s Check terminal and module connections Defective components replace components Humidity to high in sensor Contact service Failure optical measurement dev ation to calibration for reference channel too high Contact service Failure optical measurement hardware lamp Contact service ba75950e02 11 2012 NitraVis 70x IQ Indexes Message code ES5541 ES6541 ES7541 Message text Failure optical measurement hardware Contact service Failure optical measurement software Contact service Failure optical measurement software BIOS Contact service ba75950e02 11 2012 Indexes NitraVis 70x IQ Message code IAC541 IC3541 IC4541 IC5541 IC6541 9 1 2 Info messages Message text Zero adjustment was successfully carried out Carry out sensor check If required carry out new user calibration The factory zero adjustment was activated Make sure the sensor op erates correctly The last valid user zero adjustment was
10. list of all the message codes and related message texts that can occur in the log book of the IQ SENSOR NET system for the NitraVis 70x IQ Information on the contents and structure of the log book and the struc ture of the message code is given in the LOG BOOK chapter of the IQ SENSOR NET system operating manual The last three digits of the message code form the component code It Li identifies the component active component that caused the message Some error messages contain an internal error code starting with Module code Component 3A1 NitraVis 701 IQ 3A2 NitraVis 705 IQ 541 BasicVis IQ ba75950e02 11 2012 9 1 Indexes NitraVis 70x IQ Message code EA2541 EA3541 EAI541 EAM3Ax EC33Ax EI1541 EI2541 ES2541 ES3541 ES4541 9 1 1 Error messages Message text Sensor temperature too high Check process and application Sensor temperature too low Check process and application Zero adjustment erroneous Clean the sensor and sensor sleeve repeatedly Position the sensor sleeve according to operating manual Rinse the measuring chamber with ultrapure water several times Fill the measuring chamber with ultrapure water Repeat the zero adjustment Meas range exceeded or undercut Check process User calibration erroneous Check raw value reference value pairs Set all values within the measuring range see operating manual Enter value pairs in
11. no Calibration sleeve VIS CV 481 074 20 flocked cleaning cards for VIS CT 481 071 cleaning the measuring gap Cleaning set VIS C SET 481 079 20 flocked cleaning cards Cleaning solutions Description Model Order no Standard 1 ST 1 481 077 with low concentration for 5 mm UVVIS sensors Standard 2 ST 2 481 078 with high concentration for 1 mm UVVIS sensors Description Model Order no Compressed air cleaning set with SET AP 481 075 15 m compressed air hose to be connected to a valve module or Cleaning Air Box Active valve module does not MIQ CHV PLUS 480 018 require a free relay output in the IQ SENSOR NET system Valve module for the DIQ CHV 472 007 IQ SENSOR NET system 182 external relay and compressed air supply Air compressor to be triggered by Cleaning Air Box 480 017 relay power supply 115 V AC 115 VAC Air compressor to be triggered by Cleaning Air Box 480 019 relay power supply 230 V AC 230 VAC ba75950e02 11 2012 Spare parts maintenance equipment accessories NitraVis 70x IQ Mounting accessories Description Model Order no Mounting set for horizontal instal VIS Set EH 481 073 lation with EH F 170 swing mount ing assembly Flow through armature VIS FT 1 480 080 Information on other IQ SENSOR NET accessories is given in the WTW catalog and on the Internet ba75950e02 11 2012 NitraVis 70x IQ What to do if 7 What to do i
12. termi nal strip of an MIQ module is described in chapter 3 INSTALLATION of the IQ SENSOR NET system operating manual Before connecting the sensor and sensor connection cable please make sure the plug connections are dry If moisture gets into the plug connections first dry the plug connections dab them dry or blow them dry using compressed air Note Do not suspend the sensor on the sensor connection cable but use the suitable mounting equipment Information on this and other IQ SENSOR NET accessories is given in the WTW catalog and on the In ternet ba75950e02 11 2012 Commissioning NitraVis 70x IQ Connecting the sensor to the sensor connection cable Take the protective caps off the plug connections of the sensor and the SACIQ SW sensor connection cable and keep them safe 2 Plug the socket of the SACIQ SW sensor connection cable onto the plug head connector of the sensor At the same time rotate the socket so that the pin in the plug head connector 1 clicks into one of the two holes in the socket 3 Then screw the coupling ring 2 of the sensor connection cable onto the sensor up to the stop Fig 3 5 Connecting the sensor 3 6 ba75950e02 11 2012 NitraVis 70x IQ Commissioning Measuring location User calibration after initial commissioning 3 4 Initial commissioning 3 4 1 General information CAUTION Never look into the measuring window or put object
13. the application site and the level of contamination of the sensor as well as the coming job the cleaning procedure includes the following parts Every cleaning procedure starts with a basic cleaning It removes tough grime such as incrustation of fouling matter algae and biolog ical deposits If the sensor surface might be contaminated with pathogenic germs it should also be disinfected Cleaning the measuring gap Removal of lime deposits Cleaning the measuring gap Removal of grease deposits A heavily contaminated sensor from the inlet of a waste water treat ment plant for which a Sensor check or Zero adjustment should be carried out must run through all cleaning steps properly During the cleaning process always keep all surfaces moist to prevent already dissolved contamination and detergents from drying working wet on wet Finally thoroughly rinse off all remaining cleaning agents with ultrapure water If the sensor from example 1 should be cleaned on site during a routine visual inspection and should then continue measuring a basic cleaning might possibly be sufficient The quoted examples and the following descriptions are intended to give a general guideline Due to the sensor s wide range of application the type and level of contamination can considerably vary Therefore the cleaning procedure has to be individually composed If necessary individual cleaning steps have to be changed or repeated several
14. 00 mg L 0 01 mg L Activation NO3 0 0 300 0 mg L 0 1 mg L NO3 N 0 00 60 00 mg L 0 01 mg L Outlet NO3 0 0 750 0 mg L 0 1 mg L NO3 N 0 0 150 0 mg l 0 1 mg L Measuring Measuring Measuring range Resolution location mode Outlet NO3 0 0 250 0 mg L 0 1 mg L NO3 N 0 00 50 00 mg L 0 01 mg L The quoted measuring ranges are nominal measuring ranges that are theoretically possible In practice real measuring ranges exist that are given by the limits of photometric determination The limits are signifi cantly influenced by the light scattering due to solids and the absorption of accompanying substances sample matrix Therefore no fixed measuring range can be determined beforehand ba75950e02 11 2012 Technical data NitraVis 70x IQ Suitability and areas of application Measuring medium Pressure resistance Type of protection Immersion depth Operating position 8 2 Application conditions Municipal wastewater with a low proportion of industrial wastewater pH value 4 12 Flow rate 3 m s Temperature 0 C 45 C 32 F 113 F Sensor with connected SACIQ SW sensor connection cable Max allowed overpressure 105 Pa 1 bar The sensor meets all requirements according to article 3 3 of 97 23 EC pressure equipment directive Sensor with connected SACIQ SW sensor connection cable IP X8 1 bar 10 Pa min The measuring gap must be fi
15. 02 11 2012 NitraVis 70x IQ Safety 2 Safety 2 1 Safety information 2 1 1 Safety information in the operating manual This operating manual provides important information on the safe operation of the product Read this operating manual thoroughly and make yourself familiar with the product before putting it into operation or working with it The operating manual must be kept in the vicinity of the meter so you can always find the infor mation you need Important safety instructions are highlighted in this operating manual They are indicated by the warning symbol triangle in the left column The signal word e g CAUTION indicates the danger level WARNING indicates a possibly dangerous situation that can lead to serious irreversible injury or death if the safety instruction is not followed CAUTION indicates a possibly dangerous situation that can lead to slight reversible injury if the safety instruction is not followed Note indicates a situation where goods might be damaged if the actions mentioned are not taken 2 1 2 Safety signs on the product Note all labels information signs and safety symbols on the product A warning symbol triangle without text refers to safety information in this operating manual 2 1 3 Further documents providing safety information The following documents provide additional information which you should observe for your safety when working with the measuring system Operat
16. activated Make sure the sen sor operates correctly Invalid user zero adjustment was replaced by last valid user calibration Caution Wrong measured values possible Carry out a new successful zero adjustment to make sure the sensor operates correctly The invalid user zero adjustment was replaced by the factory zero adjustment Caution Wrong measured values possible Check whether the sensor operates correctly or carry out a new successful user zero adjustment ba75950e02 11 2012 NitraVis 70x IQ Indexes 9 2 Status info The status info is a coded piece of information on the current status of a sensor Each sensor sends this status info to the controller The sta tus info of sensors consists of 32 bits each of which can have the value 0 or 1 01234567 8 9 1011 12 13 14 15 Status info 10000000 00000000 general denariis T uetue 00000000 00000000 internal 1617181920212223 24 25 26 27 28 29 30 31 The bits 0 15 are reserved for general information The bits 16 21 are reserved for internal service information You obtain the status info via a manual query in the Seffings Servicel List of all components menu see system operating manual by an automated query ofa superordinate process control e g when connected to the Profibus ofthe IQ Data Server see operating manual of the IQ SENSOR NET software pack The evaluation of the status info e g in the case
17. ascending order 8 In the Settings of sensors and diff sensors menu enter the value pair or pairs see the following table The entry of calibration values outside the measuring range leads to a calibration error ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation i Default values are marked in bold Menu item Settings Explanations Cal raw value 1 0 00 5000 00 Raw value of the first value pair lower concentration For single point calibration enter O Cal ref value 1 0 00 5000 00 Reference value of the first value pair lower concentration For single point calibration enter O Cal raw value 2 0 00 10 00 5000 00 Raw value of the second value pair higher concentration or raw value of the single point calibration Cal ref value 2 Calibration evaluation 0 00 10 00 5000 00 Reference value of the second value pair higher concentration or reference value of the single point calibration The entered calibration data are checked for plausibility by the system The check can have the following results Display Meaning actions Measured value dis play Successful new valid calibration value pairs were entered for the sensor Information on the conten Calibration value pairs not accepted Sen sor is blocked for measurement A log book message is generated Causes Ascending order not observed
18. ay switches to the next higher level without saving the new settings ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation 4 Measuring Operation 4 1 Determination of measured values Absorbance spectrum of Absorbance spectrum of zero adjustment measurement Measured value algorithm Raw value User calibration data Measured value IQ Sensor Net Fig 4 1 Determination of measured values During a measurement the absorbance spectrum of the test sample is recorded and set against the stored absorbance spectrum of a zero adjustment measurement in ultrapure water The algorithm for the calculation depends on the selected application and or the measuring location The resulting raw value can be adjusted to an independent reference measurement with the aid of a so called user calibration ba75950e02 11 2012 4 1 Measuring Operation NitraVis 70x IQ 4 2 Measuring operation CAUTION Never look into the measuring window or put objects into the measur ing window during operation The emitted UV radiation can damage the eyes In the case of authorized use inadvertent eye contact with the light beam is not possible Measured value display Terminal PC Oct anp ral A D 010 Maluezs Location o Raw value 0309000 i identifiable by Measured value Hext sensor Display Options Fig 4 2 NitraVis 70x IQln the measured value display Factors affecti
19. cribed together below The sensor check and Zero adjustment are carried out with the aid of the sensor sleeve ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation Flowchart Cleaning the sensor e Clean the measurement windows Rinse the measuring chamber with ultrapure water several times e Carry out a sensor check H20 l l After cleaning several times l without significant change of l the sensor assesssment l Carry out zero adjustment Zero adjustment Operating error or defective sensor E OK rror Sensor blocked for measurement H sassuusucas After several zero adjustments Reset to e Factory zero adjustment or e last valid user zero adjustment After several sensor checks Operating error or defective sensor Fig 4 3 Overview of Sensortest Zero adjustment and user calibration ba75950e02 11 2012 4 9 Measuring Operation NitraVis 70x IQ Preparing the sensor Prepare the sensor check or Zero adjustment as follows check or AS HUS ile Switch to the measured value display with lt M gt 2 Use lt A V lt P gt to select the UV VIS sensor 3 Call up calibration with lt C gt The Maintenance condition Linked outputs are frozen window appears Maintenance condition Linked outputs are frozen Fig 4 4 Maintenance condition present state The cleaning and the determination of measured values are switched off The measured value
20. display shows a flashing invalid measured value il By activating the maintenance condition linked outputs remain in their 4 Confirm the maintenance condition with OK 5 Take the sensor out of the test sample 6 Remove the blind plug or unscrew the compressed air connec tion from the sensor T Thoroughly clean the sensor enclosure sensor sleeve and the compressed air channels see section 5 1 MAINTENANCE To finish the cleaning procedure thoroughly rinse the entire sensor with ultrapure water 8 Mount the cleaned sensor sleeve Loosen both coupling rings on the sensor sleeve Put the sensor sleeve on the sensor and align it The measuring gap is in the center of the sensor sleeve The filling opening of the sensor sleeve and the measur ing gap opening of the sensor are offset by 90 Tighten both coupling rings on the sensor sleeve by hand 4 10 ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation Measuring chamber Sensor sleeve Fig 4 5 Putting the sensor sleeve on the sensor 9 Put the sensor in a horizontal position on a firm and vibration free surface Turn the filling opening of the sensor sleeve upward Fig 4 5 10 Rinse the measuring chamber with ultrapure water at least 3 times 11 For Sensor check H20 dest or Zero adjustment Fill the measuring chamber with ultrapure water or For Sensor check standa
21. e time of the signal smoothing Depending on the sample matrix mea sured values can vary more or less strongly e g due to foreign bodies or air bubbles The signal filter here the Response time t90 reduces the limits of variation of the measured values The Response time t90 specifies the time after which 90 of a signal change are displayed This menu item is only available with Signal smoothing On The specified time is used as a guide value for low 10 min to high 60 min signal smoothing and can deviate from the value that was set Cleaning mode e On e Off Switching on off the automatic time controlled cleaning function ba75950e02 11 2012 Commissioning NitraVis 70x IQ Menu item Settings Explanations Cleaning type e Ultrasound e Air e Ujltrasound air Cleaning methods This menu item is only available with Cleaning mode On The duration of the cleaning procedure is defined in the sensor for all cleaning types Note The duration of the cleaning pro cedure with air can be adjusted for the linked relay in the menu 750 Settings of outputs and links Relay function I Sensorgesteuert Pulsdauer Please note the software requirements for the MIQ CR3 MIQ R6 MIQ CHVP lus DIQ S 182 relays see section 3 1 Save and quit The system confirms the saving of the settings and the display switches to the next higher level Quit The displ
22. ed in the calibration history at the same time Rating number Meaning Zero range Sensor check H20 dest successful OK 40 40 0 no deviation Positive number Measured values were too low 40 1000 Possible cause The measurement windows are contaminated Negative number Measured values were too high 40 1000 Possible cause During the last zero adjustment the measure ment windows were contaminated more than dur ing the current sensor check If the rating number is not in the zero range Repeat the cleaning procedure and the Sensor check H20 dest until the rating number no longer changes significantly If the rating number is still outside the zero range a new zero adjust ment is necessary Result Meaning Sensor released for measurement OK Zero adjustment successful Yes Error Zero adjustment not success No ful If the result is erroneous clean the sensor and all equipment once again Then carry out a new Zero adjustmentand when doing so make sure the conditions are absolutely clean ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation i Result after Sensor check standard Completing the sensor check or Zero adjustment i If no valid zero adjustment is possible under the current conditions you can restore the readiness for measurement by measuring with an older valid zero adjustment To do so select the Zero adju
23. ensor with the aid of the Sensor check H2O dest you can rapidly see any changes of the sensor and whether it needs to be cleaned or if any other actions have to be taken A Sensor check H2O dest should be carried out twice per year at regular intervals An extraordinary Sensor check H20 dest should be carried out if you suspect that the sensor has been damaged such as by mechanical shock or if the measured values do not seem plausible While the Sensor check H20 dest just determines the current state of the sensor a Zero adjustment can be used to compensate for changes of the sensor A zero adjustment can be required if for example the Sensor check H2O dest is not successful even after the sensor was thoroughly cleaned The sensor should always be very thoroughly cleaned prior to a zero adjustment If the Zero adjustment is not successful the sensor is blocked for mea surement A successful Zero adjustment is required for the determina tion of measured values Use the Sensor check standard to check the sensor with a standard solution see chapter 6 SPARE PARTS MAINTENANCE EQUIPMENT ACCES SORIES During the check the recorded spectrum is compared to a reference spectrum of the standard solution stored in the sensor ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation Calibration points and value pairs Selection of calibration points i Storage location of user calibration data
24. f display Cause Remedy invalid measured value User calibration values Correct the entry and enter entered incorrectly once again section 4 3 2 Repeat Sensor check H2O dest or Sensor check H20 dest or Zero adjustment or Zero adjustment or Sensor check standard Sensor check standard defective Check conditions especially cleanliness section 4 3 3 Zero adjustment still errone Contact WTW ous after several trials Unknown Seelog book Implausible measured Cause Remedy values Erroneous user calibration Repeat user calibration Make sure the samples for compari Son are representative Substantial change of test sample sample matrix Carry out new user calibration Measurement windows dirty Clean the measurement win dows Sensor setting wrong Check and if necessary cor rect the Measuring mode Mea suring location sensor settings Carry out new user calibration Optical system maladjusted e g due to inadmissible mechanical shock Carry out Sensor check H20 dest or Zero adjustment or Sensor check standard ba75950e02 11 2012 What to do if NitraVis 70x IQ Drifting measured values Display of OFL Measured values fluctuating heavily Cause Remedy Cleaning efficiency too low measurement windows becoming more and more contaminated Clean the measurement win dows section 5 2 4
25. ibration are stored in the IQ Sensor Net controller They are loaded into the sensor during operation and automatically assigned to the replacement sensor if the sensor is exchanged ba75950e02 11 2012 Measuring Operation NitraVis 70x IQ Performing a user calibration A Proceed as follows if you want to perform a user calibration In the Settings of sensors and diff sensors menu set the Signal smoothing setting to Off Subsequently leave the menu with Save and quit How to navigate to the Settings of sensors and diff sensors menu and the operation of the menu is described in section 3 4 2 1 Bring the sensor into the measuring position 2 Switch to the measured value display with M 3 Wait for a measurement read the raw value without dimen sion and note it down In the case of fluctuating values Observe several measuring cycles and average the individual raw values 4 Take a sample at the same time as the measurement and as close to the UV VIS sensor as possible 5 Determine the reference value and note it down as a value pair together with the raw value 6 For a two point calibration Determine the second value pair step 4 to step 6 At least one value pair and a maximum of two value pairs can be entered for a valid calibration The values must be in ascending order If they are not in ascending order a calibration error will occur fe Sort the values pairs in
26. ing manuals of other components of the IQ SENSOR NET system power packs controller accessories e Safety datasheets of calibration and maintenance equipment e g cleaning solutions ba75950y01 11 2012 2 1 Safety NitraVis 70x IQ 2 2 Safe operation 2 2 1 Authorized use The authorized use of the NitraVis 70x IQ consists of its use as a sensor in the IQ SENSOR NET Only the operation and running of the product according to the instructions and technical specifications given in this operating manual is autho rized see chapter 8 TECHNICAL DATA Any other use is considered unauthor ized 2 2 2 Requirements for safe operation Note the following points for safe operation The product may only be operated according to the authorized use specified above The product may only be supplied with power by the energy sources men tioned in this operating manual The product may only be operated under the environmental conditions men tioned in this operating manual The product may not be opened 2 2 8 Unauthorized use The product must not be put into operation if it is visibly damaged e g after being transported it was stored under adverse conditions for a lengthy period of time storing conditions see chapter 8 TECHNICAL DATA ba75950y01 11 2012 NitraVis 70x IQ Commissioning Software statuses of the controller and terminal compressed air via a relay components Fo
27. ing menu setting table of the sensor The procedure is described in detail in your IQ SENSOR NET system operating manual Default values are marked in bold Menu item Settings Explanations Measuring mode e NO3 N The measured parameter is displayed e NO3 in the selected citation form Measuring location NitraVis 701 IQ Measurement location or application of e Activation e nlet e Outlet NitraVis 705 IQ Outlet permanently set the sensor The possible measurement loca tions are displayed depending on the currently set measuring mode The sample matrix on which the cal culation of the measured value is based changes with the location of the sensor ba75950e02 11 2012 NitraVis 70x IQ Commissioning Menu item Settings Explanations Measuring range Display of the measuring range see chapter 8 TECHNICAL DATA Cal raw value 1 Cal ref value 1 Cal raw value 2 Cal ref value 2 Value pairs of the user calibration see section 4 3 2 Note Leave those values unchanged during the initial commission ing Zero adjustment Factory User Setting of which zero adjustment is used in the sensor Factory zero adjustment or Zero adjustment carried out last Signal smoothing e On e Off Switching on off the signal smoothing For more details see Response time t90 Response time t90 10 60 min Respons
28. lled with test sample max 10 m depth Any ba75950e02 11 2012 NitraVis 70x IQ Technical data Dimensions in mm Weight Connection technique Materials Storage temperature 8 3 General data 865 774 381 2 Wil o 60 Socket SACIQ With shock protection 96 Approx 3 8 kg without shock protectors and without sensor connec tion cable Approx 4 8 kg with shock protectors but without sensor connection cable Connection via SACIQ SW sensor connection cable Sensor shaft Titan Grade 2 Center piece PEEK End cap PEEK Measurement window Sapphire Plug head connector housing POM Plug 3 pole ETFE blue Tefzel Protection ring POM 10 C 50 C 14 122 F ba75950e02 11 2012 Technical data NitraVis 70x IQ Instrument safety Applicable norms EN 61010 1 UL 61010 1 CAN CSA C22 2 61010 1 IEC 62471 Test certificates cETLus CE m Conforms to ANSI UL 61010 1 Certified to CAN CSA C22 2 61010 1 C LISTED Intertek 2001759 8 4 Electrical data Nominal voltage Max 24VDC via the IQ SENSOR NET for more details see chapter TECHNICAL DATA of the IQ SENSOR NET sys tem operating manual Power consumption 8 W Protective class Il 8 4 ba75950e02 11 2012 NitraVis 70x IQ Indexes 9 Indexes 9 1 Explanation of the messages This chapter contains a
29. n Mass or amount of a dissolved substance per volume e g in g L or mol L The measuring system comprises all the devices used for measuring e g measuring instrument and sensor In addition there is the cable and possibly an amplifier terminal strip and armature The measured parameter is the physical dimension determined by measuring e g pH conductivity or D O concentration With the measuring method used a correlated measured parameter is not determined directly A correlated measured parameter can however be derived from a determinable measured parameter The precondition for this is that there is a reproducible interrelationship correlation between the determinable and correlated measured parameter Designation of the test sample ready to be measured The measuring gap is between the two measurement windows In the measuring gap the light beam penetrates the test sample The measured value is the special value of a measured parameter to be determined It is given as a combination of the numerical value and unit e g 3m 0 5 s 5 2 A 373 15 K The measured value is determined from the raw value taking into account the data from a user calibration The measured value is displayed together with the raw value in the measured value display ba75950e02 11 2012 10 1 Appendix Glossary NitraVis 70x IQ NO2 N NO3 N Zero adjustment Sample matrix Reference sample Ultrapure water H2O dis
30. ng the The following factors can adversely affect the measurement quality measured value The measuring gap is not sufficiently filled and flowed through by the test sample Foreign bodies and air bubbles are in the measuring gap Extraordinary changes interferences of the sample matrix Contaminated measurement windows due to difficult waste water matrix Damaged measuring windows Lacking quality of the zero adjustment e g due to contaminated ultrapure water The user calibration is not representative or erroneous 4 2 ba75950e02 11 2012 NitraVis 70x IQ Measuring Operation 4 3 Calibration 4 3 1 Overview In the delivery condition the sensor is precalibrated and ready to mea sure see section 3 4 1 There are two types of calibration that are included into the calculation of the measured value at different points see section 4 1 User calibration see section 4 3 2 Sensor check Zero adjustment see section 4 3 3 An overview diagram of the calibration procedures can be found on page 4 9 User calibration With a user calibration you compensate for the influence of the test sample The user calibration requires a successful Sensor check H2O dest and a valid Zero adjustment We recommend to check the current user calibration against indepen dent comparison measurements if you suspect a basic change of the characteristics of the test sample If the comparison measurements sho
31. nnections Load at a power supply mod ule too high Install another power supply module in the vicinity of the sensor IQ SENSOR NET cable to wards the NitraVis 70x IQ too long voltage drop too great Install another power supply module in the vicinity of the sensor Electrical connection be tween power supply module and NitraVis 70x IQ is inter rupted Check the cable connection step by step starting with the power supply module and replace any defective cable sections Check the contacts on the MIQ modules stack mounting Clean any dirty contacts Care fully bend back contact springs that have been pressed flat or bent pay attention to sufficient spring tension ba75950e02 11 2012 What to do if NitraVis 70x IQ 7 4 ba75950e02 11 2012 NitraVis 70x IQ Technical data Measuring principle Wavelength range Measuring gap optical layer thickness Nitrate measurement 1 mm gap width Nitrate measurement 5 mm gap width i 8 Technical data 8 1 Measurement characteristics Spectrophotometric absorption measurement integrated micropro cessor electronics shielded 2 wire connection for power and data transmission 200 720 nm NitraVis 701 IQ 1 mm NitraVis 705 IQ 5 mm Measuring Measuring Measuring range Resolution location mode Inlet NO3 0 0 300 0 mg L 0 1 mg L NO3 N 0 00 60
32. not touch any metallic objects in order to prevent contact corrosion Note Do not suspend the sensor on the sensor connection cable Risk of ca ble break and water penetration at the cable gland A wide range of mounting accessories is available for the installation of the NitraVis 70x IQ see chapter 6 SPARE PARTS MAINTENANCE EQUIP MENT ACCESSORIES Thus all prevalent ways of mounting are possible Generally observe the following general rules when mounting the sensor at the measuring location When mounting the sensor horizontally the measuring gap opening should be on the side Thus any air bubbles can escape upward after cleaning and no sediment can collect in the measuring gap The sensor should be aligned in parallel with the flow direction Measuring gap opening Fig 3 1 Horizontal installation ba75950e02 11 2012 NitraVis 70x IQ Commissioning Vertical installation For vertical installation mount the sensor in a position that allows inter fering elements in the measuring gap to escape with the current In the case of vertical installation the minimum flow rate is 0 2 m s so the measuring gap is kept clean optimally AR asuring gap opening Fig 3 2 Vertical installation Protection against shocks When installing the sensor always make sure it cannot knock against a wall or another obstacle Make sure the safety margins are sufficient e g with suspended mounting Mount the enclosed
33. of an automated i query has to be made individually for each bit Status info Status bit Description NitraVis 70x IQ Bit O Component hardware defective Bit 1 Component hardware defective xxx Bit 2 Optical measuring range exceeded Bit 3 31 ba75950e02 11 2012 9 5 Indexes NitraVis 70x IQ ba75950e02 11 2012 NitraVis 70x IQ Appendix Glossary Resolution Absorbance Absorption Adjusting Calibration Calibration value pair Concentration Measuring system Measured parameter Measured parameter correlated Test sample Measuring gap Measured value 10 Appendix Glossary Smallest difference between two measured values that can be displayed by a meter Attenuation of the light beam when it penetrates the sample To manipulate a measuring system so that the relevant value e g the displayed value differs as little as possible from the correct value or a value that is regarded as correct or that the difference remains within the tolerance Comparing the value from a measuring system e g the displayed value to the correct value or a value that is regarded as correct Often this expression is also used when the measuring system is adjusted at the same time see adjusting Value pair consisting of the raw value measured by the UV VIS sensor and a reference value measured e g by a laboratory deter mination The calibration value pairs are the result of the user calibra tio
34. plug or compressed air connection ba75950e02 11 2012 Maintenance and cleaning NitraVis 70x IQ 5 2 4 Cleaning the measuring gap To remove lime or grease deposits use the flocked cleaning cards together with the following detergents Contamination Cleaning agents Lime deposits Hydrochloric acid 5 96 for analysis Grease deposits Mixture of isopropanol and water approx 70 isopropanol made of 7 volume parts isopropanol for analysis and 3 volume parts ultrapure water Proceeding e Start by removing any lime deposits Soak a flocked cleaning card with the relevant detergent and use it to clean the measuring windows according to step 6 in section 5 2 3 BASIC CLEANING If necessary leave the cleaning card in the measuring gap for a few minutes so the detergent can take effect M d Thoroughly rinse with ultrapure water the measuring gap and the surrounding areas moistened with detergent Then wipe the measurement window with a lens tissue The surface of the measurement windows must be free of streaks Protect the cleaned sensor against new contamination ba75950e02 11 2012 NitraVis 70x IQ Spare parts maintenance equipment accessories General accessories replacement parts Test equipment Components for the optional compressed air cleaning system 6 Spare parts maintenance equipment accessories Description Model Order
35. r cleaning with 3 Commissioning 3 1 IQ SENSOR NET system requirements The operation of the NitraVis 70x IQ requires the following software versions in the IQ SENSOR NET e DIQ S 182 Controller software MIQ MC2 Controller software MIQ TC 2020 XT Controller software IQ Software pack Software version CONNECT MIQ CR3 Software version MIQ R6 Software version MIQ CHV PLUS Software version DIQ S 182 XT Software version Version 3 45 or higher Version 3 37 or higher Version 3 37 or higher Version 1 00 or higher Version 2 88 or higher Version 2 88 or higher Version 2 88 or higher Version 3 44 or higher 3 2 Scope of delivery of the NitraVis 70x IQ The following parts are included in the scope of delivery of the NitraVis 70x IQ UV VIS sensor Sensor sleeve Shock protectors Operating manual ba75950e02 11 2012 Commissioning NitraVis 70x IQ Horizontal installation 3 3 Installation 3 3 14 Mounting the sensor Note The sensor is an optical precision instrument that is to be protected against shocks Make sure the distances to the wall bottom and other installation surroundings are sufficient If necessary protect the sensor from hitting with the protective ring provided Mount any fixing elements only on the stable metal shaft Note Always make sure the surface of the enclosure is not damaged by sharp edged objects The enclosure of the sensor may
36. rd Fill the measuring chamber with standard solution see sec tion 6 12 Ifthere are any air bubbles on the measuring windows remove them by gently knocking on the sensor sleeve with a bar filling the sensor sleeve If you wait longer the result of the Sensor Carry out the intended sensor check or Zero adjustment directly after li check Zero adjustment will be affected canying edt m 13 Select the required option with A V lt gt and lt OK gt Zero adjustment e Sensor check H20 dest e Zero adjustment e Sensor check standard 14 Confirm with OK A multipart checklist appears Use it to check once more whether all preparations have been completed ba75950e02 11 2012 4 11 Measuring Operation NitraVis 70x IQ i Result after Sensor check H20 dest Result after Zero adjustment 15 Confirm each checklist with OK until the Start measurement display appears Up to this point you can break off the calibration procedure at any time with the lt ESC gt key The system continues to work with the old calibra tion data The maintenance condition however has to be switched off again in any case After starting the calibration with the OK key step 16 you can no longer cancel the calibration procedure 16 Confirm with OK The measurement is started After the end of the measurement the result appears With the Zero adjustment the result is enter
37. s into the measur ing window during operation The emitted UV radiation can damage the eyes In the case of authorized use inadvertent eye contact with the light beam is not possible The NitraVis 701 IQ sensor is prepared for operation in the aeration tank and calibrated in the factory For use in the inlet you only have to change the Measuring location setting The NitraVis 705 IQ sensor is prepared for operation in the outlet of the waste water treatment plant and calibrated in the factory The sensor is immediately ready to measure How to adjust the settings is described in the following section section 3 4 2 On the basis of a reference measurement laboratory value check whether the default settings deliver sufficiently accurate measured values or whether you want to carry out a user calibration see section 4 3 CALIBRATION ba75950e02 11 2012 Commissioning NitraVis 70x IQ Measuring cycle Carrying out settings 3 4 2 Settings A measuring cycle consists of the cleaning procedure the adjustment time for the measuring system and the determination of the measured value The following graphic demonstrates the relevant settings Measuring cycle o E pud c o E n E o lt x Measurement Cleaning Measuring interval Fig 3 6 Measuring cycle of the UV VIS sensor Using lt S gt switch from the measured value display to the main menu of the settings Then navigate to the sett
38. shock protectors see section 3 3 2 Their soft rub ber compound absorbs hard impacts Fig 3 3 Sensor with mounted shock protectors ba75950e02 11 2012 3 3 Commissioning NitraVis 70x IQ 3 3 2 Mounting the shock protectors The shock protectors consist of two rings a cap and four cable ties To mount the shock protectors proceed as follows Sensor with mounted shock protectors Fig 3 4 Mounting the shock protectors 1 Plug the cap pos 2 in Fig 3 4 on one of the two rings pos 1 2 Put the assembled unit on the sensor end and fix it with 2 cable ties pos 3 as shown in Fig 3 4 3 Put the second ring on the cable end of the sensor and fix it with the remaining two cable ties in the same way ba75950e02 11 2012 NitraVis 70x IQ Commissioning Connection cable Are the plug connections dry 3 3 3 Connecting the sensor to the IQ SENSOR NET A sensor connection cable of the SACIQ or SACIQ SW type is required to connect the sensor The cable is available in different lengths Compared to the standard model SACIQ the SACIQ SW sensor connection cable is optimized regarding its corrosion resistance in seawater and brackish water and adapted for use in conjunction with the NitraVis 70x IQ Information on this and other IQ SENSOR NET accessories is given in the WTW catalog and on the Internet How to connect the SACIQ SW sensor connection cable to the
39. sor check or Zero aajustment ba75950e02 11 2012 Measuring Operation NitraVis 70x IQ ba75950e02 11 2012 NitraVis 70x IQ Maintenance and cleaning 5 Maintenance and cleaning 5 1 Maintenance The UV VIS NitraVis 70x IQ sensor operates maintenance free 5 2 Sensor cleaning 5 2 1 Cleaning agents and accessories Cleaning agents To clean the sensor use the following cleaning agents only Contamination Cleaning agents Water soluble substances Primary cleaning Tapwater warm if possible 30 50 C Precision cleaning House hold washing up liquid ultra pure water Lime deposits 5 96 hydrochloric acid Grease deposits Mixture of isopropanol and water approx 70 96 isopropanol Forthe final cleaning prior to a Sensor check or Zero adjustment only use cleaning agents with purity grade for analysis Finally thoroughly rinse the sensor with ultrapure water Accessories Sponge e Plastic bristled brushes of different sizes Interdental brushes are suitable for the cleaning of the compressed air channels Flocked cleaning cards see accessories Lens tissues e Wash bottle Note Never use any pressure washer steam blaster abrasives or metal brushes to clean the sensor Risk of damaging the sensor ba75950e02 11 2012 5 1 Maintenance and cleaning NitraVis 70x IQ Example 1 Example 2 i 5 2 2 General steps to be taken Depending on
40. stment setting in the sensor settings Factory factory zero adjustment or User last valid user zero adjust ment Then check the measurement results with a Sensor check standard Suitable standards check equipment for your sensor are available as accessories see chapter 6 Result Meaning OK Sensor check standard successful Error Sensor check standard not successful Possible cause wrong or expired standard After a successful sensor check or Zero adjustment return to measure ment as follows 17 Confirm the calibration result with lt OK gt 18 Confirm the message After successful ca with OK The display returns to the measured value display The mea sured value flashes because the sensor is still in the mainte nance condition 19 Pour away the ultrapure water or standard solution and remove the sensor sleeve 20 Screw in the blind plug or compressed air connector and install the sensor at the measuring site 21 After the Sensor check standara Thoroughly rinse the sensor and sensor sleeve with ultrapure water 22 Switch off the maintenance condition use lt A V lt P gt to select the UV VIS sensor press lt OK gt and make the setting in the Display Options menu 23 Switch to the measured value display with lt M gt The measured value stops flashing Store the sensor sleeve in a clean environment e g in a plastic bag until the next sen
41. t Raw value SAK SAC Spectrum The proportion of nitrogen coming from nitrite The proportion of nitrogen coming from nitrate Measuring and saving the absorbance spectrum of ultrapure water Defines the zero points in the spectrum for all wavelengths The light beam is not alleviated at the zero point The zero point influences the calculation of the raw value Composition of the test sample of different individual substances Random sample of the test sample for comparative chemical analyt ical laboratory analyses intended for user calibration Ultrapure water is distilled or deionized water suitable for analysis purposes The raw value is determined from the spectrum while taking into account the data from the zero adjustment The raw value is displayed on the right side of the measured value in the measured value display Spectral absorption coefficient at a certain wavelength The SAC 254 value is a measure of the contents of organic compounds Distribution of the absorbance depending of the wavelength With the aid of the zero adjustment and user calibration the measured values are calculated from the spectrum 10 2 ba75950e02 11 2012 NitraVis 70x IQ Contact Information 11 Contact Information 11 1 Ordering amp Technical Support Telephone 800 897 4151 937 767 7241 Monday through Friday 8 00 AM to 5 00 PM ET Fax 937 767 1058 Email environmental Q ysi com Mail YSI Incorporated
42. times until the result meets the requirements ba75950e02 11 2012 NitraVis 70x IQ Maintenance and cleaning Steps of the basic cleaning 5 2 3 Basic cleaning Take the sensor out of the test sample and remove any solid matter deposits and incrustation of fouling matter manually with a brush or sponge Wash the sensor down with warm tapwater 30 50 C Note Do not use a pressure washer or steam blaster If the sensor might be contaminated with pathogenic germs it should be disinfected with a surface disinfectant This also applies to the cable and mounting parts Note Follow the instruction manual of the disinfectant reac tion time Remove the blind plug or unscrew the compressed air connec tion from the sensor Clean the sensor with soapy water When doing so clean the area of the measuring gap and the compressed air channels very thoroughly The compressed air channels can be cleaned with the aid of interdental brushes and rinsed with soapy water from a wash bottle Soak the flocked cleaning cards with soapy water and use them to clean the measuring gap as shown in the following fig ure Cut suitable strips off the cleaning card to clean the bottom of the measuring gap Then rinse the sensor with running warm tapwater and finally with a lot of ultrapure water Finally wipe the measurement window with a lens tissue After completing the cleaning procedure screw in the blind
43. unt of the substance The influence of typical interference matrix variants occurring at munic ipal waste water treatment plants can be eliminated by including the entire absorbance spectrum With this measuring principle measuring does not take place continu ously but at intervals ba75950e02 11 2012 NitraVis 70x IQ Overview 1 4 Structure of the UV VIS sensor A UV VIS sensor contains a light source 1 a measuring gap 3 to enable the contact of light with the measuring solution and a detector 5 to measure the attenuated light beam The sender of the optical system 2 directs a light beam the measuring beam 6 through the measuring solution and a second light beam the reference beam 8 over a distance without measuring solution The test sample is between both measurement windows 3 in the measuring gap The receiver of the optical system 4 directs the measuring beam and reference beam to the detector In the detector the light is received by fixed photo diodes 6 1 2S 45 Im mt s DN Fig 1 2 Structure of a UV VIS sensor Light source Sender of the optical system Measuring gap between the measurement windows Receiver of the optical system Detector Measuring beam Reference beam Connection for the optional compressed air cleaning system o 1 JOoj O01 o N ba75950e02 Overview NitraVis 70x IQ 1 4 ba75950e
44. w clear deviations these can be compensated by a user calibration Recalibration after changing the measuring location and the setting Measuring location was changed we recommend to carry out a Sensor check H20 dest and if the Sensor check H20 dest was not successful an additional Zero adjustmentif necessary with a subse quent user calibration il Each time after the application or measurement location troller and thus assigned to the measuring location not to the sensor The data of the user calibration are stored in the IQ SENSOR NET con i The calibration data of the Zero adjustment are stored in the sensor ba75950e02 11 2012 4 3 Measuring Operation NitraVis 70x IQ Sensor check H20 dest lil Zero adjustment lil Sensor check standard The characteristics of a sensor and thus the measured values provided by it change in the course of time The reasons for this can be the aging of the sensor or contamination or mechanical damage of the sensor Contamination or mechanical damage in the area of the measuring chamber or on the measurement windows affect the measured values In UV VISspectroscopy very small contamination that is not visible to the eye can considerably affect the measured value The proper and thorough cleaning of the sensor is the basis for reliable measurement data A Sensor check H20 dest determines the condition of the UV VIS sensor By checking the s
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