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The colony counter BZG 30 has an acoustic check signal
and automatically compensates for the weights of different
Petri dishes; the pressure sensor system also provides uniform sensitivity over the whole of the working field. Zerovoltage protection guards against power inter ruptions
The ring-shaped lamp provides uniform working field
illumination; the magnifier offers distortion-free optics
and can be individually positioned on its extremely
flexible arm.
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Light passing through liquid which contains undissolved solids, such as algae, mud, microbes and other insoluble particles, is both absorbed and scattered. Turbidity increases with the amount of undissolved solids present in the sample. However, the shape, size and composition of the particles also influence the degree of turbidity. Turbidity has been determined by simply measuring light passing through the sample. Measuring the scattered light at an angle of 90° has proved to be a more accurate method particularly at lower measuring ranges. Instruments that use this method are also referred to as nephelometers
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Thermoreactors are required for the determination of COD, total nitrogen or total phosphorus. They ensure a complete
digestion of the sample, as they maintain the necessary high reaction temperature throughout the whole of the defined
period.
In each of the thermoreactors from WTW the most important temperatures and digestion times are stored in 7, easily
selectable digestion programs. In addition to these 7 fixed standard programs, CR 3200 and CR 4200 thermoreactors allow you to store 8 of your own user-defined programs. Suitable for 16 mm cuvettes.
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Colorimeter and Spectrophotometer |
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Photometry allows the concentrations of numerous parameters to be determined. The basic principle is always the same. The substance in the water which is to be determined reacts with the test kit reagents to produce a colored product. This substance appears to be colored as it absorbs certain wavelengths contained in the white light spectrum. The photometric measurement normal takes place at the wavelength which is most influenced by the colored product. The photometer measures the intensity of the light at this wavelength before and after its passage through a cuvette containing the sample. The method data stored in the computer are used to calculate, display and document the concentration.
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To incubate samples at a constant, desired temperature during the reaction period, a thermostat cabinet is necessary.
WTW offers thermostat cabinets in various sizes with a
variably adjustable temperature range of 10°C - 40 °C and a power supply of 230 V/50 Hz.
Temperature accuracy lies at ±1 °C deviation from the set
temperature.
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