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General instrument information

Category
sitna (<200.000 kn)
Standalone or bound
samostalan
Equipment condition
funkcionalan, ali zastario
Disciplines
Kemija
Year of manufacture
1991
Acquisition date
01.01.1990
External link

Characteristics

Model
Coulter Counter Multisizer II
Manufacturer
Coulter Ltd.
Operating and measuring scope
veličina čestica 5 µm - 200 µm
Principle of work
A Coulter counter is an instrument for counting and sizing particles suspended in electrolytes. In a instrument, a tube with a small aperture on the wall is immersed into a container in which particles are suspended in a low-concentration electrolyte. Two electrodes, one inside the aperture tube and one outside the tube create a current path through the electrolyte when an electric field is applied. The impedance (effective resistance) between the electrodes is then measured. The aperture therefore creates a "sensing zone" and particles suspended in the electrolyte can be counted by passing them through the aperture. As a particle passes through the aperture, a volume of electrolyte equivalent to the immersed volume of the particle is displaced from the sensing zone. This causes a short-term change in the impedance across the aperture which can be measured as a voltage or current pulse. The pulse height is proportional to the volume of the sensed particle.
Additional equipment
a tubes with a different aperture standards
Portability
No
Remote work
No

Location

Address
Bijenička c. 54
Room
VII. krilo/podrum/soba 009

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