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BD 600

Accurate, automatic & direct control of your wastewater samples

Applications: Waste Water, Determination of Biological Activity, Waste Water Treatment Plants, Analytical Laboratories, Scientific & Research


The images can be downloaded here as a zip. archive in high resolution.


  • bd600
  • bd600
  • bd600


  • User friendly
  • Large, illuminated & brilliant graphic display
  • Graphical representation of measured values
  • USB & SD Card data transfer
  • Mercury-free, environmentally-friendly
  • Remote control
  • User-selectable time span from 1 to 28 days
  • Free individual programming of each of the six samples
  • Inductive stirring system, 100 – 240 V / 50 – 60 Hz


Respirometric BOD measurement using BD 600

The AQUALYTIC® sensor system BD 600 is a 6 sample system that allows precise measurements of BOD based on the manometric principle. Manometric respirometers relate oxygen uptake to the change in pressure caused by oxygen consumption while maintaining a constant volume. Due to the modern integral pressure sensors, it is not necessary to use mercury for the measurements.AQUALYTIC BOD-Bottle

Biochemical Oxygen Demand (BOD)

BOD – biochemical oxygen demand – is an expression for the quantity of oxygen required for biological degradation of organic matter in a waste water sample. BOD measurement is therefore used as a basis for the detection of biologically degradable organic matter in water. The difference between BOD and chemical oxygen demand (COD) is that COD additionally registers biologically non-degradable organic matter.

BOD measurement is therefore an important measurement of the effects of domestic and industrial waste water on sewage plants and outflow points.

Measuring ranges and sample volumes

The BOD level of a sample depends on the quantity of organic matter present, which can vary considerably. The BOD measuring system BD 600 is therefore calibrated for the various sample volumes and the corresponding measuring ranges listed in the table below. The overall measuring range of the system is 0 – 4000 mg/l. For all measuring ranges, BOD is shown directly in mg/l.

Range mg/l BOD Sample Volume ml
0 – 40 428
0 – 80 360
0 – 200 244
0 – 400 157
0 – 800 94
0 – 2000 56
0 – 4000 21,7

BD 600 Principle

Respirometric methods provide direct measurements of the oxygen consumed by microorganisms from an air or oxygenenriched environment in a closed vessel under conditions of constant temperature and agitation. Carbon dioxide produced metabolically by the bacteria is chemically bound by the potassium hydroxide solution contained in the seal cup in the bottle.

The result is a pressure drop in the system, which is directly proportional to the BOD value and is measured by the BOD sensor. The BOD level is then displayed directly in mg/l.

The BOD values are stored automatically in the sensor memory in regulary intervals and can be called up on the large-format display at any time without the need for time-consuming conversion using factors. This means that test series that end on a Sunday can be evaluated during the following week without any problem. Measurement series can be stored on USB stick/ SD card or transfered via USB cable to evaluate the datas on a computer.

The measurement period is user-selectable between 1 and 28 days to suit the application. While short measurement periods are useful for scientific applications, standard BOD measurements typically extend over a period of 5 days – and manometric determination of OECD, for example, generally takes place over a period of 28 days.

Catalogue extract

The Cat­a­logue ex­tract for the BD 600 with more in­for­ma­tion, tech­ni­cal data and order codes can be down­load­ed as a PDF » AL606 & AL612 PDF