Prompt decisions can be made to correct the technology in order to obtain the best result if one has information on the states of liquids used in various technologies at all stages in the working chain (extraction, transportation, processing to give the finished products, storage, and use, which sometimes is prolonged). The state or quality of the liquid is characterized from a set of physicochemical parameters, whose number varies on average from 20 to 30 for different liquids [ 1 ]. All these parameters are determined by appropriate individual methods with specialized equipment. Many of them can be recorded only under laboratory conditions, with the use of specially equipped buildings and highly qualified staff. Also, considerable time is consumed by the analysis, as well as the need for substantial specimens, and large amounts of electrical power, reagents, and other consumable materials. In part, such laboratories are fairly remote from the users of data on the specimen quality, so there is also a problem of stability and representativeness in specimens sent over long distances and held for long times. Then in most cases the user does not obtain prompt information on the liquid quality.There is an urgent need to set up methods and facilities to determine these parameters for various purposes, which should support rapid throughput (express methods), with less consumption of the specimens, power, and other materials; there should be automatic data acquisition, storage, and transmission by means of personal computers, and there should be less use of especially equipped buildings (including making portable instruments) and less demand for highly qualified staff.These measures would greatly reduce the material consumption, the cost, and the time consumed in estimating liquid quality for various purposes, the main point being that it would make available prompt and reliable information on the state at the point of production.All these requirements are met by a method of comprehensive determination of physical parameters on a single specimen, which has been developed at the Kovrov State Technical Academy. The quantities determined are selected physical parameters, for two reasons: firstly, the selected physical parameters are the molecular composition and the molecular interactions [2], which characterize all the properties of the liquids; secondly, determining the exact values can quite readily be automated. The measurements are made with a sensor of piezoelectric transducer-cylinder-piston type (Fig. 1).The piezoelectric transducer radiates into the liquid and receives the ultrasound reflected from the end of the piston. The reflected wave is converted to an electrical signal, which is processed by an electronic system. The radiated power is so low that it does not cause any changes in the liquid. The solenoid uses a magnetic field to displace the piston from the bottom position to the top one. The piston is returned to the initial position under gravity. During its motion, the parameters of the reflected ultrasou...

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