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Summary of Contents for Aqualytic OxiDirect BOD-System
- Page 1 BOD-System OxiDirect ® Instruction Manual...
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Page 3: Table Of Contents
Content The system ..........5 Principle of the method . - Page 4 Content Inductive stirring system ....... . . 20 Instructions ..........21 8.1.1 Correct use.
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Page 5: The System
The System Principle of operation BOD is measured by the pressure difference within a closed system (respirometric BOD). The integrated memory saves a BOD value automatically every 24 hours for a test period of more than 3 days. Applications Determination of BOD and BOD , OECD 301F / biological degradability. -
Page 6: The Method
The Method Biochemical Oxygen Demand (BOD) The biochemical oxygen demand (BOD) of waste water, industrial effluents and surface water is an expression for the amount of oxygen consumed by the decomposition of organic matter in a biochemical process. Principle of Measurement The BOD system, consisting of the sample bottle and the BOD sensor, represents a closed system. -
Page 7: Operation
Operation Keys Functions • Switches the unit on and off (automatic switch off approx. 45 sec after last operation) • Quits sub-menus • 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 • Confirms input ENTER • Switches to other sections in menus • Head key : selects the position required • Head LED : indicates the position which has been selected... -
Page 8: Definitions
3.2 Operating Modes Operating status, in which the „OxiDirect“ displays the last stored Display mode value and the selected measurement period for a head Operating status, in which all the stored values for a head can be Read-out mode displayed, together with the associated time of measurement Start mode Operating status, in which measurements can be started The „OxiDirect“... -
Page 9: Displays
3.4 Displays and their Meanings LEDs Meaning Action required Indicate the postion which has LEDs been activated LED is lit Measurement is complete LED flashes Measurement is not yet complete Dispay Meaning Action required • Change batteries (see „Changing Battery is nearly empty the Batteries“-3.11.4) • Check whether there is a head at „OxiDirect“... - Page 10 3.4 Displays and their Meanings Dispay Meaning Action required No measurement figure present No „start-value” present, so no actual BOD value can be see „Autostart“ calculated Bottles must not be removed during the „start“ process. Also, F120 An error has occurred on „Start“ positions must not be changed during the „start“...
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Page 11: Initial Set Up
3.5 Initial Set Up The batteries are packed separately when the unit is delivered. If necessary, remove all the bottles from the rack, turn the rack and open the battery compartment. Install the three alkali- manganese batteries (C/LR14) in the battery compartment (checking for correct polarity).The unit should then switch on automatically and the display will show „Set DAte“. -
Page 12: Reading Stored Values
3.8 Reading out stored values Once the unit is switched on, press the key to select the position required and confirm by pressing the „Enter“ key. The unit will switch to „Display Mode“ for this position. The upper display will now show the measurement time and the lower display will show the value which has been stored. -
Page 13: Starting Measurement
3.10 Starting measurement Starting a new measurement will delete all stored data from the head ! Place a prepared bottle in a vacant position of the rack. Switch on the unit and press the corresponding head key to activate this position. Pressing the „Start“... -
Page 14: Parameter Menu
3.11 Parameters Menu Press the „ENTER“ key and hold it depressed. Switch on the unit with the On/Off key. Allow three decimal points in the lower display to flash for 3 seconds and then release the „ENTER“ key. The unit is now in the parameters menu. The „+“ and „-“ keys can now be used to select between the Date/Time, „Autostart“, „Autoduration“... -
Page 15: Autoduration
3.11.3 Autoduration Confirm „Set“ “dur“ with the „ENTER“ key. The „+“ and „-“ keys can be used to set figures between 1 and 28, as well as „OFF“. Figures between 1 and 28 specify the measurement period in days, while „OFF“ deactivates the „Autoduration“. With „Autoduration“ deactivated, the unit will ask for the required measurement period in the „Start Mode“... -
Page 16: Bod Measurement
BOD Measurement Sample Volume The sample volume is related to the expected BOD value. The OxiDirect is designed ® to operate with the following ranges and sample volumes, allowing BOD measurement up to 0 - 4000 mg/l, without any dilution. Range BOD mg/l Sample volume in ml Dosage ATH... - Page 17 To inhibit nitrification, we recommend the addition of nitrification inhibitor B ( = Allyl Thiourea, or ATH). This is particularly important for the low range 0 - 40 mg/l (for example, when checking discharges from effluent treatment plants). The right amount of nitrification inhibitor B is related to the measurement range - see 4.1.
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Page 18: Interpretation Of Results
Interpreting the Results Start 1. Day 2. Day 3. Day 4. Day 5. Day The BOD value on any particular day must be higher than the one of the previous day. BOD values do not increase in a linear manner. The increase is always smaller than the one of the previous day. -
Page 19: Checking The Measurement System
Checking the Measurement System Test Set (Order code: 418328) The test set enables a check of all the components of the OxiDirect . Using a special ® reagent tablet, a defined underpressure is generated in the sealed BOD bottle. Maintenance High-quality metal alloys are used for the contacts between the BOD sensors and the bottle rack. -
Page 20: Inductive Stirring System
Inductive Stirring System É Ñ Ö Å Ç Fig. 1: Inductive stirring drive with stirring controller Å Stirring place Ç Stirring device É Controller Ñ Plug Ö Cable... -
Page 21: Instructions
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” CAUTION! This sign indicates risks to equipment and machinery INFORMATION... -
Page 22: Safety Requirements
Safety Requirements For your own safety, you should observe the following warnings. The safety warnings indicate a possible source of danger. At the same time they give information how to avoid damage. You will always find these signs where danger can occur. - Page 23 CAUTION! Do not place hot samples on top of the magnetic stirrer (2). Maximum temperature : 56 °C. CAUTION! In case of repair, the equipment must only be opened by an authorised service technician. Disconnect from mains before opening ! 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.
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Page 24: Equipment Description And Function
Equipment Description and Function The stirring system has been designed for stirring liquids in standard BOD bottles. The ultra-slim stirring drive (2) has 6 stirring areas (1) and a separate controller (3). Bottles can be removed from the rack without stopping the stirring drive (2). The inductive stirring drive has no motor and is therefore wear-free. -
Page 25: Magnetic Stirring Rods
Magnetic stirring rods We recommend the use of PTFE-coated magnetic stirring rods. INFORMATION The length of the magnetic stirring rod (8) must not exceed 40 mm. Stirring CAUTION! Do not place hot samples on the magnetic stirrer (2). Maximum temperature : 56 °C. Fill the bottles with the sample. Place a magnetic stirring rod into every bottle. -
Page 26: Maintenance And Cleaning
Maintenance and Cleaning The stirring drive (2) is maintenance-free. The magnetic drive is embedded in a synthetic resin and is completely watertight. Clean the surface of the stirring drive (2) in regular intervals using a cleaning or a disinfectant solution suitable for use on PVC. Clean the surface of the stirring controller (3) using dry cloth. -
Page 27: Technical Data
Technical Data BOD System Type OxiDirect ® Measurement principle Manometric; mercury-free; electronic pressure sensor Ranges 0 - 40, 0 - 80, 0 - 200, 0 - 400, 0 - 800, 0 - 2000, 0 – 4000 mg/l [mg/l O Applications , BSB , OECD 301 F ... -
Page 28: Inductive Stirring System
Inductive Stirring System Type Inductive Stirring System Stirring volume 6 BOD bottles Stirring power Rotation speed 320 rpm (reduced to 200 rpm every 40 s) Dimensions (W x D x H) 270 x 180 x 25 mm Distance between 88 mm stirring points Weight (stirring drive) 1800 g... -
Page 29: Accessories And Spare Parts
10. Accessories and Spare Parts List Article Order code Replacement BOD sensor 2444430 Stirring controller 444413 Inductive stirring drive 2444451 Test Set 418328 Potassium hydroxide solution (50 ml) 2418634 Nitrification inhibitor B (50 ml) 2418642 BOD sample bottle 418644 Seal cup (gasket) 418636 Magnetic stirring rod 418637... - Page 30 AQUALYTIC ® Technische Änderungen vorbehalten. Postfach 41 02 53 Printed in Germany 11/08 44272 Dortmund No.: 00385163 Germany We reserve the right to alter Telefon: (+49) (0)2 31/9 45 10 - 755 or amend any of the items Telefax: (+49) (0)2 31/9 45 10 - 750 contained herein without prior notice.
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