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©2008 Thermo Fisher Scientific Inc. All rights reserved. RDO is a registered trademark of In-Situ Inc., Fort Collins, CO USA. All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

Environmental Instruments Water Analysis Instruments

Thermo Scientific Orion RDO® Optical Dissolved Oxygen Sensor

Quick Start GuideGuía rápida / Kurzanleitung / Guide de démarrage / Guida rapida Temperature Sensor

Sensor de TemperaturaTemperaturfühlerSonde de températureSensore di Temperatura

Thread RingAro de RoscaEinschraubringBagueAnello filettato

Spring ContactsContactos ResortesFederkontakteRessort de contactContatti a molla

Optical WindowVentana OpticaOptisches FensterFenêtre optiqueFinestra Ottica

O-ringsO-ringsO- RingeJoints toriquesO-ring

Protective GuardProtectorSchutzhülseArmature de protectionCilindro Protettore

RDO CapCapsula RDORDO- ModulTête RDOCappuccio RDO

257263-001 Rev. A 09-08

ENGLISH

RDO® Sensor Preparation Important Note: The RDO sensor has an internal clock that counts down the 365 day lifespan of a new RDO cap. The countdown begins when the RDO cap is installed on the RDO sensor, the RDO sensor is connected to the meter and the first measurement is taken. The 365 day countdown cannot be reset or changed once the first measurement is taken.

1. Remove the protective shipping cap from the end of the RDO sensor. See A.

2. Lubricate the two O-rings on the RDO sensor with a thin film of silicone grease. See B.

3. Align the arrow on the RDO cap with the arrow on the RDO sensor. See C.

4. Slide and press the RDO cap onto the RDO sensor until the cap is flush with the sensor body. See D.

Note: Do not twist the RDO cap. Once the cap is installed, it should not be removed from the RDO sensor unless a new cap needs to be installed or troubleshooting needs to be performed.

5. Connect the RDO sensor to the 9 pin miniDIN input on the meter. See E.

Note: An Err 880 message on the meter indicates that the RDO sensor is not fully connected to the meter. Reconnect the sensor by firmly pushing the connector into the 9 pin miniDIN meter input.

Note: An Err 882 message on the meter indicates that the RDO cap is missing or not properly installed on the RDO sensor.

RDO Sensor StorageStore the RDO sensor in the calibration sleeve, making sure to wet the sponge with distilled water, or store the sensor in a beaker with distilled water. See F.

A

B

C

D

E

F

Preparacion de Sensor RDO SP

Nota Importante: El Sensor RDO tiene un reloj interno que lleva una cuenta regresiva partiendo de 365 dias. Este es el periodo de vida de una nueva Capsula RDO. La cuenta regresiva comienza cuando la Capsula RDO se instala al Sensor RDO y el Sensor RDO se conecta al equipo y se toma la primera lectura. La cuenta regresiva de 365 dias no se puede cambiar ni resetear una vez que se realiza la primera lectura.

1. Remueva la capa protectora del sensor RDO. Ver A.

2. Lubricar los dos O-rings en el sensor RDO con una capa muy delgada de grasa de silicone. Ver B.

3. Alinear la flecha de la Capsula RDO con la flecha en el Sensor RDO. Ver C.

4. Deslize y presione la Capsula RDO al Sensor RDO hasta que la capsula quede emparejada al cuerpo del sensor. Ver D.

Nota: No enrosque la Capsula RDO. Una vez que la capsula se instala, la misma no debe removerse del Sensor RDO al menos que una nueva capsula se vaya a instalar o sea necesario resolver un problema en el funcionamiento del Sensor.

5. Conecte el Sensor RDO al conector de 9 pines miniDIN del equipo. Ver E.

Nota: Un mensaje de Err 880 en el equipo indica que el Sensor RDO no esta bien conectado al equipo. Reconecte el Sensor empujando firmemente el conector de Sensor al conector de 9 pines miniDIN del equipo.

Nota: Un mensaje de Err 882 en el equipo indica que falta la Capsula RDO o que la misma no esta instalada correctamente al Sensor RDO.

Almacenaje del Sensor RDOAlmacene el Sensor RDO en la manga de calibracion. Asegurese de humedecer la esponja de la manga con agua destilada o almacene el Sensor en un beaker con agua destilada. Ver F.

RDO Sensor Vorbereitung DE

Wichtige Information: Der RDO Sensor hat eine interne Uhr, die die 365 Tage Lebensdauer eines neuen Sensormoduls herunter zählt. Das Herunterzählen beginnt, wenn das RDO – Modul angebracht, der Sensor an das Gerät angeschlossen und eine erste Messung durchgeführt wurde. Dieser Prozess kann nicht rückgängig gemacht werden, nachdem die erste Messung durchgeführt wurde.

1. Entfernen Sie die Transportschutzkappe vom Ende des RDO- Sensors. Siehe A.

2. Versehen Sie die zwei O- Ringe am RDO- Sensor mit einem dünnen Film Silikonfett. Siehe B.

3. Bringen Sie den Pfeil des RDO- Moduls mit dem Pfeil am RDO- Sensor in eine Linie. Siehe C.

4. Schieben und pressen Sie das RDO- Modul auf den RDO- Sensor bis das Modul mit dem Sensor fest verbunden ist. Siehe D.

Bemerkung: Bitte drehen Sie nicht das RDO- Modul. Wenn das Modul einmal installiert ist, sollte es nicht wieder entfernt werden, bis ein neues Modul installiert wird oder eine Fehlersuche dieses erfordert.

5. Schließen Sie den RDO- Sensor an den 9 mm miniDIN- Anschluss des Gerätes an. Siehe E.

Bemerkung: Eine Err 800 Fehlermeldung am Gerät zeigt an, dass der RDO- Sensor nicht richtig an das Gerät angeschlossen wurde. Schließen Sie den Sensor erneut an und drücken Sie dabei etwas kräftiger den Stecker in die Buchse.

Bemerkung: Eine Err 882 Fehlermeldung am Gerät zeigt an, dass das RDO- Modul fehlt oder nicht richtig am RDO- Sensor installiert ist.

RDO Sensor LagerungLagern Sie den Sensor im Kalibriergefäß, in welchem der Schwamm mit destilliertem Wasser angefeuchtet wurde oder lagern Sie den Sensor in einem Becherglas mit destilliertem Wasser. Siehe F.

Préparation sonde RDO FR

Note Importante: La sonde RDO possède une horloge interne qui décompte les 365 jours de durée de vie de la tête RDO. Le compte à rebours commence lorsque la tête RDO est installée sur la sonde, que la sonde RDO capteur est reliée à l’appareil et que la première mesure est effectuée. Le compte à rebours des 365 jours ne peut pas être réinitialisé ou modifié une fois que la première mesure est prise.

1. Retirer le capuchon de protection en bout de la sonde RDO. Voir A.

2. Lubrifier les 2 joints toriques de la sonde RDO avec une fine couche de graisse silicone. Voir B.

3. Aligner les flèches de la tête RDO avec les flèches de la sonde RDO. Voir C.

4. Faire glisser et appuyer sur la tête RDO sur la sonde jusqu’à ce que la tête soit au niveau de la sonde. Voir D.

Note: Ne pas faire tourner la tête RDO. Une fois que la tête est installée, elle ne devrait pas être retirée de la sonde RDO, sauf si une nouvelle tête doit être installé ou un dépannage doit être effectué.

5. Brancher la sonde RDO à la prise miniDIN 9 broches de l’instrument. Voir E.

Note: Le message d’erreur Err 880 indique que la sonde RDO n’est pas correctement branchée à l’instrument. Rebrancher la sonde en l’enfichant fermement dans la prise miniDIN 9 broches.

Note: Le message d’erreur Err 882 indique que la tête RDO est absente ou mal installé sur la sonde RDO.

Conservation sonde RDOConserver la sonde RDO dans son manchon de calibration, vérifier que l’éponge a été humidifiée avec de l’eau distillée, ou conserver la sonde dans un bécher avec de l’eau distillée. Voir F.

Preparazione Sonda RDO IT

Nota Importante: La sonda RDO ha un orologio interno che conta alla rovescia i 365 giorni di durata del nuovo cappuccio RDO. Il conteggio comincia quando il cappuccio RDO viene installato sulla sonda RDO, la sonda RDO viene collegata al misuratore e si effettua la prima misura. Il conteggio dei 365 giorni non può essere resettato o cambiato dopo che sia stata presa la prima misura.

1. Rimuovere il cappuccino protettivo dalla fine della sonda RDO. Vedi A.

2. Lubrificare I due O-ring sulla sonda RDO con un sottile film di grasso di silicone. Vedi B.

3. Allineare la freccia sul cappuccino RDO con la freccia sulla sonda RDO. Vedi C.

4. Far scorrere e spingere il cappuccio RDO nella sonda RDO finchè il cappuccino è a livello con il corpo del sensore. Vedi D.

Nota: Non girare il cappuccino RDO. Dopo che il cappuccio è stato montato, non deve essere più rimosso dalla sonda RDO, fino a che non sia necessario montare un nuovo cappuccio o se indicato dall’individuazione guasti.

5. Collegare la sonda RDO all’ingresso 9 pin miniDIN sul misuratore. Vedi E.

Nota: Un messaggio di errore 880 sul misuratore indica che la sonda RDO non è stata ben collegata al misuratore. Ricollegare fermamente il connettore all’ingresso 9 pin miniDIN.

Nota: Un messaggio di errore 882 sul misuratore indica che il cappuccino RDO non c’è o non è stato montato correttamente sulla sonda RDO.

Conservazione della sonda RDOConservare la sonda RDO nel manicotto di calibrazione assicurandosi di aver bagnato la spugna con acqua distillata, o conservare la sonda in un bicchiere con acqua distillata. Vedi F.

User GuideRDO® Optical Dissolved OxygenSensor

ROSS and the COIL trade dress are trademarks of Thermo Fisher Scientific Inc.

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© 2008 Thermo Fisher Scientific Inc. All rights reserved. RDO is a registered trademark of In-Situ Inc., Fort Collins, CO USA. All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

The specifications, descriptions, drawings, ordering information and part numbers within this document are subject to change without notice.

This publication supersedes all previous publications on this subject.

�RDO® Optical Dissolved Oxygen Sensor User Guide

Table of Contents

�ntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

�mportant Notes – Read Before Assembling or Operating the Equipment . . . . . . . . . . . . . . . . . . . . . . . . .2

RDO Sensor Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . .3

RDO Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Calibration Sleeve Preparation for Water-Saturated Air Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . .4Zero Oxygen Solution for Zero Point Calibration . . . . . . . . . . . . . .5

Stainless Steel Protective Guard . . . . . . . . . . . . . . . . . . . .6

RDO Sensor Measurements . . . . . . . . . . . . . . . . . . . . . . . . .7

RDO Sensor Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

RDO Sensor Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .8Cleaning the RDO Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Cleaning the RDO Sensor Body . . . . . . . . . . . . . . . . . . . . . . . . . .8 Cleaning the Optical Window . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Yearly Replacement of the RDO Cap . . . . . . . . . . . . . . . . . . . . . .9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

�nterfering Substances . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Substances That Damage the RDO Sensor . . . . . . . . . . . . . . . . 12

Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

WEEE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Ordering �nformation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

�� RDO® Optical Dissolved Oxygen Sensor User Guide

1RDO® Optical Dissolved Oxygen Sensor User Guide

�ntroductionThis user guide contains information on the preparation, operation and maintenance of the Thermo Scientific Orion RDO optical dissolved oxygen sensors . These dissolved oxygen sensors are compatible with a wide range of applications including rugged field applications, water and wastewater analysis and beer and wine testing . All of the RDO sensors feature automatic temperature compensation and convenient press-on RDO caps .

Orion Star™ RDO Optical Dissolved Oxygen SensorsThe Orion Star RDO optical dissolved oxygen sensors have a 9 pin miniDIN connector that ensures a waterproof and secure connection when used with the Orion Star Plus RDO optical dissolved oxygen meters .

Figure 1 – RDO Optical Dissolved Oxygen Sensor

Temperature SensorThread Ring

RDO Cap

Spring Contacts

Optical Window

O-rings

2 RDO® Optical Dissolved Oxygen Sensor User Guide

Required Equipment1 . Thermo Scientific Orion Star Plus RDO optical

dissolved oxygen meter .

2 . Thermo Scientific Orion RDO optical dissolved oxygen sensor .

3 . RDO cap, Cat . No . 087001 .

4 . Calibration sleeve, Cat . No . 087003 .

5 . Stainless steel protective sensor guard (optional), Cat . No . 087002 .

6 . Magnetic stirrer or stirrer probe, Cat . No . 096019 . The stirrer probe can be used with 3-Star, 4-Star and 5-Star Plus benchtop RDO meters .

7 . Distilled or deionized water .

�mportant Notes – Read Before Assembling or Operating the Equipment

Note: Do not touch the bottom of the RDO cap, optical window or spring contacts on the RDO sensor.

Note: The silicone grease that is supplied with the RDO sensor should only be used to lubricate the two O-rings on the RDO sensor. Do not fill the RDO cap with the silicone grease, as this will impair the function of the RDO sensor and damage the optical window and RDO cap.

Note: The RDO sensor has an internal clock that counts down the 365 day lifespan of a new RDO cap. The countdown begins when the RDO cap is installed on the RDO sensor, the sensor is connected to the meter and the first measurement is taken. The 365 day countdown cannot be reset or changed once the first measurement is taken.

3RDO® Optical Dissolved Oxygen Sensor User Guide

RDO Sensor Preparation1 . Remove the protective shipping cap from the end of the

RDO sensor

2 . Lubricate the two O-rings on the RDO sensor with a thin film of the silicone grease that is supplied with the sensor .

3 . Align the arrow on the RDO cap with the arrow on the RDO sensor . See Figure 2 .

Temperature Sensor

Thread Cap

RDO Cap

Spring Contacts

Optical Window

O-rings

Figure 2

4 . Slide and press the RDO cap onto the RDO sensor until the cap is flush with the sensor body . See Figure 3 .

Note: Do not twist the RDO cap. Once the cap is installed, the cap should not be removed from the RDO sensor until a new cap needs to be installed or troubleshooting needs to be performed.

Figure 3

5 . Connect the RDO sensor to the 9 pin miniDIN input on the meter . See Figure 4 .

Figure 4

Note: An Err 880 message on the meter indicates that the RDO sensor is not fully connected to the meter. If this error appears, reconnect the sensor by firmly pushing the connector into the 9 pin miniDIN meter input.

Note: An Err 882 message on the meter indicates that the RDO cap is missing or not properly installed on the sensor.

4 RDO® Optical Dissolved Oxygen Sensor User Guide

RDO Sensor CalibrationCalibration of an RDO optical dissolved oxygen sensor can be done quickly and conveniently by performing a water-saturated air calibration . Under equilibrium conditions, the partial pressure of oxygen in air-saturated water is equal to the partial pressure of oxygen in water-saturated air . This means that a sensor calibrated in water-saturated air will correctly read the partial pressure of oxygen in water samples . When measuring low concentration samples (less than 1 ppm), a second calibration with a zero oxygen standard is recommended .

Calibration Sleeve Preparation for Water-Saturated Air Calibration1 . Remove the cap from the calibration sleeve and remove the

sponge from the cap .

2 . Saturate the sponge with distilled water and squeeze the excess water out of the sponge .

3 . Reassemble the calibration sleeve .

4 . Unscrew and remove the thread ring from the RDO sensor . See Figure 5 . Slide the calibration sleeve over the front of the RDO sensor and screw the sleeve onto the sensor .

5 . Wait at least five minutes for the RDO sensor to equilibrate .

6 . Follow the instructions in the meter user guide for performing a water-saturated air calibration .

�RDO® Optical Dissolved Oxygen Sensor User Guide

Zero Oxygen Solution for Zero Point Calibration1 . Perform a water-saturated air calibration .

2 . Prepare a sodium sulfite solution by dissolving about 15 .0 g of Na2SO3 in about 250 mL of distilled water . Transfer the solution to a BOD bottle or flask .

Note: A small amount of cobalt salt can be added to the sodium sulfite solution. The cobalt salt will act as an indicator and change color when the sodium sulfite solution no longer has a zero oxygen content.

3 . Add a stir bar to the bottle or flask . Insert the RDO sensor into the bottle or flask and use parafilm to seal the open area between the bottle or flask and the sensor .

4 . Place the bottle or flask on a magnetic stir plate and gently stir the solution .

5 . Wait at least five minutes for the RDO sensor to equilibrate .

6 . Follow the instructions in the meter user guide for performing a zero point calibration .

7 . Thoroughly rinse the RDO sensor under running water and blot it dry with a lint-free tissue .

Note: If the RDO sensor is sluggish or inaccurate after a zero point calibration, not all of the sodium sulfite was removed from the sensor. A very thorough soaking and rinsing of the RDO sensor in distilled water is required to remove all of the sodium sulfite solution and restore the sensor performance. Soak the RDO sensor in distilled water for 30 minutes, blot it dry with a lint-free tissue, use a wash bottle to rinse the sensor with distilled water, soak the sensor for another 30 minutes in fresh distilled water and blot it dry with a lint-free tissue.

6 RDO® Optical Dissolved Oxygen Sensor User Guide

Stainless Steel Protective GuardThe RDO optical dissolved oxygen sensor can be used with the stainless steel protective guard, Cat . No . 087002 . The guard protects the RDO sensor from damage and adds weight to the sensor for low depth measuring applications .

�nstallation of the Protective Guard1 . Unscrew and remove the thread ring from the RDO sensor .

See Figure 5 .

Figure 5 – Thread Ring

Temperature Sensor

Thread Cap

RDO Cap

Spring Contacts

Optical Window

O-rings

2 . Slide the protective guard over the front of the RDO sensor and screw the guard onto the sensor . See Figure 6 .

Figure 6 – RDO Sensor with Protective Guard

Temperature Sensor

Thread Cap

RDO Cap

Spring Contacts

Optical Window

O-rings

7RDO® Optical Dissolved Oxygen Sensor User Guide

RDO Sensor MeasurementsFor accurate measurements, the RDO sensor must be immersed in solution until the temperature sensor is covered by at least a ½ inch of the solution .

If any salt or mineral deposits are observed on the RDO sensor, immediately rinse them off with distilled or deionized water .

1 . Rinse the RDO sensor with distilled water, blot it dry with a lint-free tissue and insert it into the sample .

2 . Follow the instructions in the meter user guide for performing a measurement .

3 . Remove the RDO sensor from the sample, rinse it with distilled water, blot it dry with a lint-free tissue, insert the sensor into the next sample and repeat step 2 or refer to the RDO Sensor Storage section for the recommended storage procedures .

RDO Sensor Storage

Short Term StorageBetween measurements and overnight, leave the RDO cap on the RDO sensor and keep the sensor in the calibration sleeve, making sure to wet the sponge with distilled water, or in a beaker with distilled water . Keep the RDO sensor away from direct sunlight during storage .

Long Term StorageLeave the RDO cap on the RDO sensor and keep the sensor in the calibration sleeve, making sure to wet the sponge with distilled water, or in a beaker with distilled water . Keep the RDO sensor away from direct sunlight during storage .

8 RDO® Optical Dissolved Oxygen Sensor User Guide

RDO Sensor MaintenanceFigure 7 – RDO Sensor and RDO Cap

Temperature Sensor

RDO Cap

Spring Contacts

Optical Window

O-rings

Cleaning the RDO Cap1 . Make sure that the RDO cap is properly installed on the

RDO sensor and rinse the cap and temperature sections of the sensor with distilled water from a squirt bottle or spray bottle and blot dry with a lint-free soft cloth .

2 . Inspect the RDO cap for scratches or discoloration and replace the cap if any flaws are observed . If algal growth is present on the RDO cap, gently clean it with a soft brush .

Note: Do not use solvents or soaps to clean the RDO cap and do not rub the cap with abrasive material. Use of these materials will damage the RDO cap and void the warranty. Do not let salt or mineral deposits form on the RDO cap. To remove salt or mineral deposits from the cap, refer to step 2 in the Cleaning the RDO Sensor Body section.

Cleaning the RDO Sensor Body1 . Make sure that the RDO cap is properly installed on the

sensor and gently scrub the sensor body with a soft brush .

2 . Calcareous fouling can normally be dissolved with household vinegar . Disconnect the RDO sensor from the meter and soak the assembled sensor, with the RDO cap installed on the sensor, in vinegar overnight . If the marine growth remains, use clean cotton swabs to gently wipe the growth off after it has been softened by soaking in vinegar .

3 . After cleaning the RDO sensor, thoroughly rinse the sensor in distilled water and blot it dry with a lint-free tissue before using or storing it . After cleaning the RDO sensor, a water-saturated air calibration should be performed .

�RDO® Optical Dissolved Oxygen Sensor User Guide

Cleaning the Optical Window1 . Remove the RDO cap and gently wipe the optical window

with a clean lens cloth .

Note: Do not wet the optical window area with water or any other solution.

Yearly Replacement of the RDO Cap The RDO cap must be replaced every 365 days . The meter will display an Err 881 message when the RDO cap needs to be replaced . To view the days remaining before the RDO cap must be replaced, refer to the meter user guide .

1 . Turn the power to the meter off .

2 . Remove the old RDO cap from the RDO sensor . Pull the cap straight off of the sensor and do not twist the cap .

3 . Remove the existing two O-rings from the RDO sensor .

4 . Remove any moisture from the RDO sensor body with a lint-free tissue . Do not touch the optical window or spring contacts with anything other than a lint-free tissue . Make sure that there is no moisture in the O-ring grooves .

5 . Apply a thin film of silicone grease around the O-ring grooves and install the two new O-rings on the sensor . Only use the silicone grease and O-rings that are supplied with the RDO cap .

6 . Lubricate the two O-rings on the RDO sensor with a thin film of silicone grease . Do not allow any silicone grease to touch the optical window or spring contacts .

7 . Examine the optical window for scratches or dirt and clean it if necessary . To clean the optical window, gently wipe it with a clean lens cloth .

8 . Install a new RDO cap onto the RDO sensor by aligning the arrow on the cap with the arrow on the sensor and pressing the cap onto the sensor until the cap is flush with the sensor body . Do not twist the RDO cap . Make sure that the O-rings are not pinched or rolled between the cap and the sensor .

9 . Turn the power to the meter on .

10 . After replacing the RDO cap, a water-saturated air calibration should be performed .

10 RDO® Optical Dissolved Oxygen Sensor User Guide

TroubleshootingThe most important principle in troubleshooting is to isolate the components of the system and check each in turn . The components of the system include the meter, RDO sensor, sample and technique .

Meter The meter is the easiest component to eliminate as a possible cause of error . Thermo Scientific Orion meters include an instrument checkout procedure in the meter user guide . Consult the meter user guide for complete instructions and verify that the meter operates correctly and is stable in all steps .

RDO Sensor 1 . Rinse the RDO sensor thoroughly with distilled water, blot

it dry with a lint-free tissue and inspect the RDO cap for scratches or discoloration .

2 . Remove the RDO cap from the RDO sensor and make sure that there is no water inside the cap, the optical window is clean and clear, the O-rings are intact and have a thin coating of silicone grease and the spring contacts are clean and undamaged .

3 . If readings continue to be erratic and unstable, the RDO cap may need to be replaced . Refer to the RDO Sensor Maintenance section .

Sample If the RDO sensor works properly in standards but not in the sample, look for possible interferences or substances in the sample that could alter the sensor response or physically damage the sensor . If possible, determine the composition of the sample and check for issues .

Technique Check if the method of analysis is compatible with your sample .

11RDO® Optical Dissolved Oxygen Sensor User Guide

Troubleshooting Chart

Issue Recommended Action

Unable to calibrate the RDO sensor

Verify the calibration setup and procedure .

Make sure that no water droplets are on the surface of the RDO cap .

Perform RDO sensor maintenance . Refer to the Troubleshooting and RDO Sensor Maintenance sections .

Dissolved oxygen measurements are unstable

Measurements may take longer if the solution temperature is unstable .

Perform RDO sensor maintenance . Refer to the Troubleshooting and RDO Sensor Maintenance sections .

Interfering substance may be present .

Dissolved oxygen measurement is too low

Salt may be present in the sample . Set the salinity factor in the meter .

Perform RDO sensor maintenance . Refer to the Troubleshooting and RDO Sensor Maintenance sections .

Wrong temperature displayed

Verify that the temperature sensor on the RDO sensor is immersed in the solution .

Contact Technical Support .

Bad zero point calibration

The RDO sensor must be in an oxygen-free solution for at least five minutes .

Make sure that the open area between the sensor and bottle is covered with parafilm .

Bad reading after zero point calibration

Soak the RDO sensor in distilled water for 30 minutes, use a wash bottle to thoroughly rinse the sensor with distilled water and then soak the sensor for another 30 minutes in fresh distilled water .

Err 880 error message

The RDO sensor is not fully connected to the meter . Reconnect the RDO sensor .

Err 881 error message

The RDO cap has expired . Install a new RDO cap .

Err 882 error message

Verify that the RDO cap is fully seated on the sensor body .

Install a new RDO cap .

12 RDO® Optical Dissolved Oxygen Sensor User Guide

�nterfering SubstancesAlcohols greater than 5%, hydrogen peroxide (H2O2) greater than 3%, sodium hypochlorite (NaClO, commercial bleach) greater than 3%, gaseous sulfur dioxide (SO2) and gaseous chlorine (Cl2) may interfere with the dissolved oxygen measurements . If the measurements are unstable and other troubleshooting procedures do not correct the problem, there may be interfering substances present in the solution .

For information and instructions on using the RDO sensor for specific applications that may contain interfering substances, contact Technical Support or visit our application and technical resources website at www .thermo .com/waterapps .

Carbon dioxide (CO2), ammonia (NH3), pH, any ionic species like sulfide (S2

-), sulfate (SO4-2), chloride (Cl-) and hydrogen sulfide

(HS-) do not interfere with the dissolved oxygen measurements .

Substances That Damage the RDO SensorDo not use the RDO sensor in solutions that contain organic solvents, such as acetone, chloroform or methylene chloride .

AssistanceAfter troubleshooting all components of your measurement system, contact Technical Support . Within the United States call 1 .800 .225 .1480 and outside the United States call 978 .232 .6000 or fax 978 .232 .6031 . In Europe, the Middle East and Africa, contact your local authorized dealer . For the most current contact information, visit www .thermo .com/contactwater .

For the latest application and technical resources for Thermo Scientific Orion products, visit www .thermo .com/waterapps .

WarrantyFor the most current warranty information, visit www .thermo .com/water .

13RDO® Optical Dissolved Oxygen Sensor User Guide

WEEE Compliance This product is required to comply with the European

Union’s Waste Electrical & Electronic Equipment (WEEE) Directive 2002/96/EC . It is marked with the symbol on the left .

We have contracted with one or more recycling/disposal companies in each EU Member State and this product should be disposed of or recycled through them . Further information on compliance with these directives, the recyclers in your country and information on Thermo Scientific Orion products that may assist the detection of substances subject to the RoHS directive are available at www .thermo .com/WEEERoHS .

Ordering �nformation

Cat. No. Description

087010MD RDO optical dissolved oxygen sensor with 3 meter cable, RDO cap, calibration sleeve and stainless steel protective guard

087020MD RDO optical dissolved oxygen sensor with 6 meter cable, RDO cap, calibration sleeve and stainless steel protective guard

087030MD RDO optical dissolved oxygen sensor with 10 meter cable, RDO cap, calibration sleeve and stainless steel protective guard

087050MD RDO optical dissolved oxygen sensor with 15 meter cable, RDO cap, calibration sleeve and stainless steel protective guard

087100MD RDO optical dissolved oxygen sensor with 30 meter cable, RDO cap, calibration sleeve and stainless steel protective guard

087001 Replacement RDO cap

087002 Stainless steel protective guard

087003 Calibration sleeve

14 RDO® Optical Dissolved Oxygen Sensor User Guide

Specifications

Dissolved Oxygen Range 0 to 20 mg/L 0 to 200 %

Dissolved Oxygen Accuracy ± 0 .1 mg/L up to 8 mg/L ± 0 .2 mg/L from 8 to 20 mg/L

Dissolved Oxygen Resolution

0 .01 mg/L

Dissolved Oxygen Response Time

90% of final value in 30 seconds, 95% of final value in 90 seconds

Temperature Range 0 to 50 °C

Temperature Accuracy ± 0 .3 °C

Minimum Immersion Depth 40 mm

Sensor Length (Tip) 70 mm

Sensor Diameter (Tip) 16 mm

Overall Sensor Length 190 mm

Maximum Sensor Diameter 33 mm

Cable Length 087010MD – 3 meters 087020MD – 6 meters 087030MD – 10 meters 087050MD – 15 meters 087100MD – 30 meters

RDO Cap Expected Lifespan

1 year

Specifications are subject to change without notice

Thermo Fisher Scientific

Environmental Instruments Water Analysis InstrumentsNorth America 166 Cummings Center Beverly, MA 01915 USA Toll Free: 1-800-225-1480 Tel: 1-978-232-6000 Dom. Fax: 1-978-232-6015 Int’l Fax: 978-232-6031

EuropeP.O. Box 254, 3860 AG Nijkerk Wallerstraat 125K, 3862 BN Nijkerk, The Netherlands Tel: (31) 033-2463887 Fax: (31) 033-2460832

Asia PacificBlk 55, Ayer Rajah Crescent #04-16/24, Singapore 139949 Tel: 65-6778-6876 Fax: 65-6773-0836

www.thermo.com/water258432-001 Rev. A 10-08