Sinit- 80 VESTNIK MOSKOVSKOGO UNIVERSITETA

Samples are taken from a body of liquid at intervals by converting continuous flow of fluid from a pressurized source into intermittent sample-propelling flow. Both the repetition frequency of sampling and the duration of individual samplings is controlled through regulation of the propellant flow rate. Principal uses are in stream monitoring for pollution control, sewage treatment facilities, and industrial waste reduction programs.