FIELD: measurement equipment.
SUBSTANCE: proposed invention relates to instruments of measurement of charged particles in samples for tests in biology, chemistry, industry or ecology, in particular, to instruments for measurement of ion concentration, for instance, lithium ion concentration in samples, such as blood samples. The technical result is achieved due to the fact that an instrument (1) for measurement of concentration of one type of charged particles in the sample (10), the first chain with a unit (54) of voltage control, which is connected to two first electrodes (30, 30'), located along the channel (12), containing a sample (10); the second chain with a unit (55) for detection of specific conductivity, which is connected to at least two second electrodes (5, 5'), placed in the channel (12), besides, the first chain and the second chain have electric isolation from each other; and the channel (12) contains fluid medium, containing gas, concentration of which inside the channel (12) is maintained at the level not exceeding the specified limit value. At the same time the first chain and the second chain have electric isolation for facilities of one or several transformers.
EFFECT: higher accuracy to measure concentration of charged particles.
10 cl, 8 dwg
