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Densitometer is designed for measurement of cell suspension’s turbidity in the range of 0.0-6.0 McFarland units (0 – 180×10 cells/ml). Densitometers provide the opportunity to measure solution turbidity in a wider range (up to 15.0 McFarland units) however, it is necessary to remember that in this casethestandard deviation values increase. A densitometer is used for measurement of cell concentration (bacterial, yeast cells) during fermentation process, determination of microorganism sensitivity to antibiotics, microorganism identification using various test-systems, for measurement of absorption at the definite wavelength, as well as for quantitative estimation of concentration of colour solution,absorbing green light.
The operation principle is based on measurement of optical density with digital presentation of results in
McFarland units. The unit is calibrated at the factory (for operation with 16 mm diameter glass tubes) and
keeps calibration without power supply. However, if necessary it is possible to calibrate the unit by 2-6 points in 0.0-6.0 McFarland unit range. We recommend to use Biosan standards to ensure full reliability, but it is acceptable to use other commercial as well as self prepared standards (e.g. BaSO4). Possibility to restore factory calibration settings.
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