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Aqualytic OxiDirect BOD-System, Instruction Manual

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Aqualytic OxiDirect BOD-System Instruction Manual Download Page 21

21

8.1  Instructions

8.1.1  Correct use

 

This inductive stirring system has been designed for stirring liquids in BOD bottles.

8.1.2  Symbols

 

The following instruction symbols are used in this operating manual:

 

 

DANGER!

 

 

This sign refers to dangerous voltages 

 

 

DANGER!

 

 

This sign refers to hazardous situations. 

 

Risks to human life are indicated by the term ”LIFE HAZARD” 

y

 

CAUTION!

 

 

This sign indicates risks to equipment and machinery

i

 

INFORMATION

 

 

This sign indicates easier working practices

Summary of Contents for OxiDirect BOD-System

Page 1: ...Instruction Manual GB BOD System OxiDirect ...

Page 2: ......

Page 3: ...s 9 3 5 Initial Set Up 11 3 6 Switching on 11 3 7 Switching off 11 3 8 Reading stored values 12 3 9 Reading actual values 12 3 10 Starting measurement 13 3 11 Parameter menu 14 3 11 1 Setting date and time 14 3 11 2 Autostart 14 3 11 3 Autoduration 15 3 11 4 Replacing batteries 15 3 12 Data transfer 15 3 13 Notes 15 4 BOD measurement 16 4 1 Sample volume 16 4 2 Preparing the water sample 16 5 Inte...

Page 4: ... description and function 24 8 4 Set Up 24 8 5 Magnetic stirring rods 25 8 6 Stirring 25 8 7 Maintenance and cleaning 26 8 8 Trouble shouting 26 8 8 1 The stirring rod rotates unevenly 26 8 8 2 The stirring rod swerves back and forth 26 9 Technical data 27 9 1 BOD system 27 9 2 Inductive stirring system 28 10 Accessories and spare parts 29 ...

Page 5: ...chnological applications in aqueous solutions 1 3 Illustrations Equipment supplied 1 x BOD measuring device with integrated bottle rack 6 x BOD sensor material ABS 6 x BOD bottles 6 x seal cups Gasket 6 x magnetic stirring rods 1 x stirring system drive 1 x stirring system controller 1 x nitrification inhibitor ATH 1 x potassium hydroxide solution KOH solution 45 2 x overflow measurement flasks 15...

Page 6: ...roxide in the seal gasket This generates a decrease in pressure within the system This is measured by the BOD sensor and displayed as a BOD value in mg l O2 2 3 Preparing the Sample Brief Summary Estimate the measurement range and select the volume for the sample 4 1 Carry out necessary pre treatment of the sample e g setting the pH value filtering etc 4 2 Measure the volume of the sample precisel...

Page 7: ...s Breaks off operations START Set Up of measurements READ Reading of a current value for a selected position does not store value Increases parameter figure Reduces parameter figure ENTER Confirms input Switches to other sections in menus Head key selects the position required Head LED indicates the position which has been selected 1 2 3 4 5 6 ...

Page 8: ...ing current pressure values and calculating the BOD from the difference between the two Display mode Operating status in which the OxiDirect displays the last stored value and the selected measurement period for a head Read out mode Operating status in which all the stored values for a head can be displayed together with the associated time of measurement Start mode Operating status in which measu...

Page 9: ...ether there is a head at the selected position Check contacts between head and rack xd The unit is in display mode The upper display shows the selected measurement period The lower display shows the last value which has been stored d x h x The unit is in read out mode and shows the stored value for day d hour h x 1 28 days or 1 48 hrs UFL The values are below the permitted measurement range below ...

Page 10: ...it has not located a head at the position which has been selected Insert a bottle with head and press the On Off key or Select another position The unit will change to Display Mode Srt und DEL The data for the head at the selected position have not yet been read out To continue the start process press the Enter key NOTE All data on this head will be deleted To quit the start process press the On O...

Page 11: ...ss If there is no head at this position the OxiDirect will display LoAd When it is switched on the OxiDirect is in Display Mode in which the last stored value and the selected measurement period are displayed or a display as shown in Table 3 4 For example Meaning Upper display 5d days 5 days BOD Lower display 178 mg l 178 mg l O2 as the last stored value 3 7 Switching off The unit is switched off ...

Page 12: ...can be used to select another position If this position is vacant the unit remains in read out mode and shows LoAd Place a head in this position for reading out the stored values or select another position Pressing the On Off key will cause the unit to quit read out mode and go to display mode For a measurement period of one or 2 days BOD 1 and BOD 2 the measurement time is stated in hours For mea...

Page 13: ...the measurement range Pressing the Enter key will select the displayed sample volume range and the start process will continue The unit checks whether Autoduration is active If so the unit will automatically select the specified measurement period and will activate the measurement The measurement period is not displayed If Autoduration is not active the unit will display the last measurement perio...

Page 14: ...lay shows M and the single minutes the display shows m Each entry must be confirmed by pressing the ENTER key Finally press the ENTER key once more to adopt the figures which have been set The unit sets the internal clock to these figures and provided no mistakes have been made will display iS Set The date time menu can be quitted at any time by pressing the On Off key 3 11 2 Autostart Using the A...

Page 15: ...mpartment replace all the samples their positions are not important and switch the unit on again If the unit switches automatically to the date time menu after a change of batteries this means that the break in the power supply was too long It will then be necessary to reset the date and time 3 12 Data transfer Switch the OxiDirect off Connect the OxiDirect RS232 interface with the serial interfac...

Page 16: ...ptimum pH value for biochemical oxidation is between pH 6 5 and 7 5 If the pH value of the sample is higher or lower it should be pre adjusted Any significant deviation will result in a lower BOD value If the pH value is too high it can be reduced by adding dilute hydrochloric acid 1 mol l or dilute sulphuric acid 1 mol l If the pH value is low it can be adjusted with a sodium hydroxide solution 1...

Page 17: ...ents which will attack the sensor resulting in severe damage to the plastic housing and even to a failure of the sensor The use of sealing greases and lubricants is not covered by our guarantee 6 Before measurement begins the prepared sample must be brought to the desired temperature e g BOD5 20 C This can be achieved by placing the sample in a ther mostatically controlled cabinet while stirring t...

Page 18: ... system The information given refers to normal samples municipal wastes and the normal cir cumstances of a BOD measurement However deviation are always possible depending on the samples For example if there is a reading of zero after 5 days this may be a sign of severe inhibition or oxidizing of the sample In the case of industrial effluents samples may contain toxic substances These must be remov...

Page 19: ...m contact between the BOD sensor and the bottle rack as well as insuring proper stirring the BOD measurement system has 4 levelling screws on its base If necessary the BOD base unit including the bottle rack and the BOD sensors can be cleaned carefully with a soft cloth All parts which come into contact with the sample BOD bottles seal cups magnetic stirring rod must be cleaned thoroughly after ea...

Page 20: ...20 8 Inductive Stirring System Fig 1 Inductive stirring drive with stirring controller Å Stirring place Ç Stirring device É Controller Ñ Plug Ö Cable Ñ É Ö Ç Å ...

Page 21: ...he following instruction symbols are used in this operating manual DANGER This sign refers to dangerous voltages DANGER This sign refers to hazardous situations Risks to human life are indicated by the term LIFE HAZARD y CAUTION This sign indicates risks to equipment and machinery i INFORMATION This sign indicates easier working practices ...

Page 22: ...s pacemakers watches can be affected by magnetic fields Keep such parts away from the magnetic stirrer 2 and the magnetic stirring rods DANGER Voltage and frequency must be within the range specified for the control unit 3 y CAUTION Do not use in hazardous locations y CAUTION General ambient conditions Stirring drive 2 10 to 56 C at 100 humidity Control unit 3 0 to 40 C at max 80 humidity Avoid ex...

Page 23: ...ct from mains before opening y CAUTION Do not allow the magnetic stirring rod to rest in an alternating magnetic field Do not place the magnetic stirring rod in a strong inverse magnetic field This may result in destruction of the magnetic field of the stirring rod i INFORMATION The length of the magnetic stirring rod must not exceed 40 mm Do not use elliptical stirring rods with a round cross sec...

Page 24: ... rod in the middle of the bottle The magnetic stirring rods are driven synchronously preventing practically any interfe rence between them 8 4 Set Up DANGER Voltage and frequency must be within the range specified for the control unit 3 DANGER Magnetism Magnetic or metallic parts e g data carriers pacemakers watches can be affected by magnetic fields Keep such parts away from the magnetic stirrer ...

Page 25: ... on the magnetic stirrer 2 Maximum temperature 56 C Fill the bottles with the sample Place a magnetic stirring rod into every bottle Place bottles in the BOD rack The control unit 3 is preset to operate at 320 rpm Every 40 seconds the speed is reduced to 200 rpm which will re center the nagnetic stirring rod if necessary If you want to stop the stirring process Disconnect the control unit 3 from t...

Page 26: ... 8 8 1 The magnetic stirring rod rotates unevenly Over time some ageing of the stirring rod cannot be avoided This may reduce its magnetisation y CAUTION Do not allow the magnetic stirring rod to come to rest in an alternating magnetic field e g in an unfilled stirring vessel when the stirring or mixing mode is selected Do not subject the magnetic stirring rod to a strong inverse magnetic field or...

Page 27: ...eriod User selectable between 1 and 28 days Auto result storage up to 28 results depending on measurement period Storage interval hourly 1 day for measurement period of every 2 hours 2 days daily 3 28 days Automatic start function automatic start after pressure decrease can be switched off Power supply 3 alkaline manganese batteries Battery life 1 year normal use as BOD5 meter max one reading a da...

Page 28: ...ts Weight stirring drive 1800 g Housing material PVC General Ambient Conditions 10 to 56 C at 100 humidity Operating voltage 20 V max Control cable 2 m Protection class IP 68 DIN 40050 Stirring controller 230 V version 220 240 V 10 V 50 60 Hz protection class II thermal fuse CE 115 V version 110 120 V 10 V 50 60 Hz protection class II thermal fuse CE Permanent ambient conditions 0 to 40 C at max 8...

Page 29: ...c stirring rod 418637 Magnetic stirring rod remover 418638 Overflow measuring flask 428 ml 418660 Overflow measuring flask 360 ml 418659 Overflow measuring flask 244 ml 418658 Overflow measuring flask 157 ml 418657 Overflow measuring flask 94 ml 418656 Overflow measuring flask 56 ml 418655 Overflow measuring flask 21 7 ml 418664 Complete set overflow flasks 418654 Thermostatically controlled incub...

Page 30: ...nted in Germany 11 08 No 00385163 We reserve the right to alter or amend any of the items contained herein without prior notice AQUALYTIC Postfach 41 02 53 44272 Dortmund Germany Telefon 49 0 2 31 9 45 10 755 Telefax 49 0 2 31 9 45 10 750 ...

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