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O2X 

 

 

DUO

 

- 3  - 

 

 

 

Introduction 

The O2X DUO sensor is designed to continuously measure dissolved oxygen levels in 

liquids. The O2X DUO is effective in saving energy costs associated with aeration 

systems in an activated sludge process. In addition, accurate measuring of dissolved 

oxygen allows for better control of nitrification/denitrification. 

The O2X DUO features two different principles of measuring; Clark Cell electrode or 

optical cell. See section 3 below. 

 

1.

 

A few words about this manual 

This manual details installation procedures and operational features of the Cerlic O2X 

DUO sensor. Menu navigation and technical data for the BB1/BB2 control box can be 

found in the BB1/BB2 service manual

 

2.

 

Design 

The O2X DUO sensor is manufactured with SS2343 (316SS) stainless steel. Built-in 

flushing nozzles allow for the most accurate readings with little maintenance. The 

electronics is protected in the rugged casing, ensuring its reliability in very demanding 

environments. 
The sensor has a fixed, shielded 10 m (33’) M12 cable used for signal transmission 

between the sensor and the BB1/BB2 control box. The cable sheath is made of Hytrel 

and is highly resistant to aggressive materials and fluids. 

 

3.

 

Measuring principle 

Clark cell, 

The electrode is a Clark type electrode with FEP membrane . The Clark cell 

detects the oxygen though its reduction at the Gold electrode. The sensor consists of a 

Gold cathode and Silver anode. A membrane covers the gold & silver electrodes and 

blocks access of solids to the electrodes. Only dissolved gases such as oxygen can pass 

thru  the membrane, hence the reduction current responds to the oxygen concentration. 
Active components included in the electrode are treated to maximize their life span. 

Inside the electrode there is also a temperature sensor mounted in a way that minimizes 

problems with temperature adjustments. This provides compensation of the electrode 

due to temperature changes. There is a connector on the electrode for the O2X amplifier 

cable. The temperature can be read on the BB1/BB2 and can be used as secondary 

signal when an O2X sensor is configured to use two mA outputs. The temperature 

measurement is not a precision measurement but should rather be seen as an indication. 

Optical cell, 

The optical cell is using phase shift technology to determine the oxygen 

concentration. A special coating is applied to the acrylic disc in the top of the optical 

electrode and called sensor cap in the manual. The optical cap is not sensitive to UV 

light, but it is recommended when doing an air calibration to have the sensor in the 

shade. The Clark & Optical cells can be interchanged in the O2X DUO sensor but an 

air calibration must be preformed. There is a connector on the electrode for the O2X 

amplifier cable. The temperature can be read on the BB1/BB2 and can be used as 

secondary signal when an O2X DUO sensor is configured to use two mA outputs. The 

temperature measurement is not a precision measurement but should rather be seen as 

an indication. 

Summary of Contents for O2X Duo

Page 1: ...2018 11 20 C14D5EN19 O2X DUO Dissolved Oxygen Sensor ...

Page 2: ...Mounting the protection plate 7 8 Cleaning the Sensor 8 Cleaning the Flushing Nozzle 9 Mounting plate for solenoid valves 9 9 Sensor display 9 10 Menu for O2X DUO Sensor 10 Settings 10 Calibrate 10 Cleaning 11 Scale Alarm 11 System 11 11 Calibration 12 Zero Calibration 12 Air calibrating a sensor 13 Air pressure conversion 14 12 Scaling 14 13 Technical description 15 Certificate of conformity 15 1...

Page 3: ...e and Silver anode A membrane covers the gold silver electrodes and blocks access of solids to the electrodes Only dissolved gases such as oxygen can pass thru the membrane hence the reduction current responds to the oxygen concentration Active components included in the electrode are treated to maximize their life span Inside the electrode there is also a temperature sensor mounted in a way that ...

Page 4: ...rodes Optical CellsMembranes 10305470 Sensor Holder 11205541 Telescopic Rod 3 sections Fiberglass 4 Meter 13 1 20205652 Stainless steel Handrail Mounting bracket X including rodholder 11205539 Adjustable SS slide rail and sensor holder 66 mm 11205600 Solenoid valve for flushing 230 VAC Inlet hose 16mm 5 8 to sensor 8mm 1 4 11705516A Solenoid valve for flushing 115 VAC Inlet hose 16mm 5 8 to sensor...

Page 5: ...vertical Installation Tips Adjust the rod so that the sensor is at least 30 cm 12 below the liquidsurface or the lowest water level in decant applications SBR s to prevent the sensor from coming out of the liquid In an aeration tank ensure that the sensor is not directly above a diffuser head To obtain the most representative dissolved oxygen level the sensor should be installed on the backside of...

Page 6: ...nd the sensor 7 Changing or installing a new electrode cell The electrode cell can be both assembled and disassembled without special tools Do not clamp the SS sensor housing or the cable when installing or removing the SS flushing head Please note The new optical cell can be mounted on all sensors with serial number higher than 7 25 078 bought later than 1 sept 2014 For older models please contac...

Page 7: ...electrode must be adapted to the holes for the flush pipes Tighten the SS flushing head and mount the protection plate if needed See below the instructions on mounting the protection plate A new air calibration must be performed whenever the electrode cell is changed For the optical cell also a 0 calibration shall be done The date when the electrode cell is changed shall be entered in thecalibrati...

Page 8: ...o be cleaned as a slave along with another sensor then these parameters are set for the sensor being the master Specify the freeze time in seconds after the flush forrecover If the sensor shall be cleaned as master specify the relay to be used according to the wiring inside the control box For example if the solenoid is wired torelay 1 select 1 for flushing If the sensor is to be cleaned as a slav...

Page 9: ...alves for the built in flushing nozzles Cerlic offers a predrilled Aluminum handrail mounting plate The Mounting plate is fixed to the rail using two u bolts Mounting plate P N 10305533 for one or two solenoids outside US version P N 11705516A 11705516 B US Version and a connection box P N 11505748 9 Sensor display By simultaneously pressing and ENTER you change between BB1 BB2 main menu and the s...

Page 10: ...ional information not a precision measurement Temp0 Temperature scaling value that will give max output on second channel Default is 100 C but can be adjusted Calibrate Airpres mB Specify within 10 mBar Go to weather station on internet to obtain for your zip code or location Calibrate No Zero or Air Select what calibration to do Temp info Shows actual temperature in the electrode Test info Shows ...

Page 11: ...o test the Flush cycle Scale Alarm Max 0 99 9 mg l measured value equal to 20 mA output signal Min 0 99 9 mg l measured value equal to 4 mA output signal Hi Alarm 0 99 9 mg l the value zero inactivates the alarm Low Alarm 0 99 9 mg l the value zero inactivates the alarm Alarm Relay 1 2 or 1 and 2 Check to make sure that the relay is not being used for cleaning System Type Type of sensor read only ...

Page 12: ...ug in the cell Zero calibrating a sensor Select the O2X DOU sensor in the Main Menu by using the or buttons Press ENTER for approximately five seconds to enter the SensorMenu Use the arrows to select the Calibration sub menu and pressENTER Select Calibrate Press ENTER Use the arrows to select Zero three choices can be done Air No Zero Press ENTER Wait for the zero calibration to finish usually tak...

Page 13: ... Select the Calibration press ENTER Enter the current air pressure in mBar It is sufficient to specify the pressure within 10 mBar see table below for conversion from inHg to mBar Select Calibrate Press ENTER Use the arrows to select Air three choices can be made Air No Zero Press ENTER Wait for the sensor to be calibrated A successful calibration will take anywhere between 3 to 15 minutes for the...

Page 14: ...or the 4 20mA output signal In addition this menu allows the user to set high and low alarms values that can be used to notify when the level has reached criticalpoints Max sets the 20 mA point output Min sets the 4 mA point output may be a negative valuefor special applications Hi Alarm sets the High Alarm set point the value zero inactivates the alarm Low Alarm sets the Low Alarm set point the v...

Page 15: ...m 33 ft Flushing hose material PE LD Enclosure IP68 NEMA 4X Certificate of conformity The O2X DUO sensors along with their central unit BB1 BB2 Control Box are in conformance with the following EC Directive s when installed in accordance with the installation instructions contained in the product documentation 2014 35 EU Low Voltage Directive LVD 2014 30 EU Electromagnetic Compatibility EMC Direct...

Page 16: ...ssion standard for industrial environments 14 Dimensions Appendix 1 Assembly of handrail mounting kit Mount the Flexible Mounting Bracket on handrail diameter of 1 2 32 50 mm Ø or square 1 1 8 1 5 8 28 42 mm The bent lip on the mounting plate shall be on top and faced toward the liquid or tank Adjust the Mounting Bracket to the correct angle and tighten the SS nuts The bracket shall be fixed to th...

Page 17: ...ervice the instrument wind up a couple of meters of the cable and fasten it on the rail with attached cable tie Hint on pick up let the rod hang freely and lift it straight up before you swing it over the rail Pull the M12 cable and flush hose through the sensor holder and rod Connect the telescoping fiberglass rod to the sensor with the two piece black plastic adapter The adapter halves should be...

Page 18: ...Appendix 2 Assembly of adjustable slide rail ...

Page 19: ... time for five seconds Select System and press ENTER Version Serial Box temp Box heat Leave the BB1 BB2 menu by pressing and ENTER at the same time Use or to select the sensor in the main display Go to the sensor menu it is accessed by pressing ENTER for five seconds Select System and press ENTER Type Serial SoftW Temp Select Info then press ENTER to go to the info menu MS0 MS1 Cons 1 Ch1 Ch2 Con ...

Page 20: ...b menu of the sensor menu the following parameters can be set I time No of decimals Analog Second In the Cleaning sub menu of the sensor menu the following parameters can be set Cleaner Cleaning interval Cleaning length Cleaning freeze Cleaning relay In the Scale Alarm sub menu of the sensor menu the following parameters can be set Max Min High Alarm Low Alarm Alarm Relay Leave the BB2 menu by pre...

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