BOD Measurement System with Direct sample selection & Interface

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

Galerie

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Highlights

• Direct sample selection
• Accurate and direct display of BOD values in mg/l
• User-friendly handling
• User-selectable measuring period from 1 to 28 days (BOD5, BOD7, OECD…)
• Storage of all values
• Measuring ranges from 0-40 mg/l to 0-4000 mg/l BOD, sample volume related
• Auto start function after temperature equalisation
• Mercury-free, environmentally-friendly
• Inductive stirring system with automatic re-centering of stirring rods
• Interface RS 232

Description

AL606 & AL612

The AQUALYTIC sensor system AL606 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. Thanks to the modern integral pressure sensors, it is no longer necessary to use mercury for pressure measurements.

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 AL606 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.

AL606 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 AQUALYTIC BOD sensor. The BOD level is then displayed directly in mg/l.

The BOD values are stored in the sensor memory 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.

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 AL606 & AL612 with more in­for­ma­tion, tech­ni­cal data and order codes can be down­load­ed as a PDF »