FIELD: instrument engineering.
SUBSTANCE: invention relates to a sampling unit for liquid samples adapted to be fitted into a system with pressure variations, which system contains or transports a liquid. Sampling unit comprises a wall section which partly surrounds a cavity filled with liquid, an opening equipped with a blocking element, that prevents the liquid from flowing into or out of the cavity at a substantially stable pressure in the system, but allows the liquid to flow into the cavity when the pressure in the system increases from a resting pressure to an operating pressure, and out of the cavity when the pressure in the system drops back from the operating pressure to the resting pressure.
EFFECT: invention makes it possible to obtain a sample of liquid from the system for a predetermined period of time and to determine the level of the substance that the liquid contained.
21 cl, 14 dwg
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