MEDIDOR DE DEMANDA BIOQUÍMICA DE OXÍGENO.

For Biochemical Oxygen Demand (BOD) testing, Hach offers everything you need for both the traditional dilution method and the respirometric method using the BODTrak™ II Apparatus. The BodTrak II method offers unattended analysis with temperature stabilization, continuous data readout, and auto shut-off, eliminating much of the technical difficulty of BOD testing.

Simplify BOD analysis with this updated version of the BODTrak^TM Apparatus.  Results comparable to the dilution method can be achieved in only two to three days.  Use these results for process control or as a complement to the dilution method*.

Kit includes BODTrak II instrument, 100-240 V auto-switching power supply, continental European and North American power cords, six amber glass BOD bottles, six seal cups, six stir bars, spatula scoop, 50 nutrient buffer solution pillows, 25 g bottle potassium hydroxide pellets, and printed English manual.

*The BODTrakII method is not approved by the USEPA for NPDES reporting purposes.

 Principle of Operation

The BODTrak^TM II Apparatus measures Biochemical Oxygen Demand (BOD) using the respirometric method.  The BOD test measures the quantity of oxygen consumed by bacteria that oxidize organic matter in a water sample.  A pressure sensor monitors air pressure in the sample bottle and a stir bar continually mixes the sample during the incubation period.  As bacteria in the sample consume the organic matter and oxygen, the air in the bottle above the sample replenishes the oxygen used by the bacteria.  This causes a pressure drop inside the bottle.  The instrument's software converts this pressure drop to mg/L BOD. 

The carbon dioxide produced by the bacteria is removed by potassium hydroxide pellets placed in the seal cup of the sample bottle.  This assures that the measured pressure difference is in relation to only the quantity of oxygen used.  The closed system prevents atmospheric pressure changes from interfering with the test.

The large display allows the user to monitor results at any time.  The system collects 360 data points over the user-selected 5, 7, or 10 day measurement period.  The results are displayed as a graph of BOD over time.  The user can move a cursor along the curve to see the BOD value at any point in time.  These results can be downloaded to a PC or the Citizen PD-24 printer via the RS232 port on the side of the instrument.

Improvements of the BODTrak II Apparatus

The BODTrak II Apparatus is an updated version of the BODTrak and offers many additional features, which include:

• Improved stirring
• Improved temperature control
• Greaseless bottle seals
• Larger display screen
• Smaller footprint
• Auto-switching power supply
• Bottle fences
• Improved procedures with expanded options
• More intuitive user interface
• Carbon dioxide absorber in pellet form
• Software upgrade via RS232

Advantages over the Dilution Method

• Simplified procedure
• Minimal time to prepare a sample
• Decreased total test time
• No calibration or DO measurement
• Results can be monitored at any time
• Standalone operation

Key Benefits:

• Quick sample preparation
• Results comparable to the dilution method in only two to three days
• View results at any time
• No need to be present when the test is complete
• Independent channels allow you the flexibility to set different ranges and start times for up to six samples
• No calibration required
• Built-in temperature stabilization period allows for more accurate results

Standard Features:

• Large graphic display screen
• Automatic storage of 360 data points per test
• Continuous data readout
• Data transfer to PC or priner via RS232
• Automatic shut-off
• User-selectable ranges (0-35, 0-70, 0-350, 0-700 mg/L)
• 5, 7, or 10 day test length options
• Built-in temperature stabilization period
• Factory calibration

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