U.G. Mamedov - Assistant, Azerbaijan State Oil Academy. E-mail: mulduz@mail.ru

An analysis of polymer molecular weight determination is conducted. A generalized flowchart of a system for determination of the mentioned parameter is suggested and its operations principle is suggested. With this purpose a viscosimetric method is used, in which, by determining characteristic viscosity a molecular weight of a polymer is calculated. In the suggested system at first a dissolvent with the definite volume V0 is filled up into a capacity E with a mixer. By using a pump (P) dissolvent is introduced into a measuring device for viscosity and density (MDVD) for measurement of viscosity and density of a dissolvent. After this, by using a solution input device (SID), a solution of a polymer of a volume V1 with the concentration C1 is introduced into the capacity E. After mixing solution with dissolvent in the capacity E a solution of concentration C1* is obtained. In the process of mixing by using P the solution is uninterrupted returned through the MDVD into the capacity E to obtain homogenous solution. Control of homogeneity of the solution is carried out by using MDVD by measuring viscosity and density. The described process is executed until fre the prescribed polymer solution concentration is achieved. After this, on the base of the obtained data a molecular weight of the polymer is determined. The main link of the system is MDVD. Then two schemes MDVD of solution or fluid are considered. It is considered a device for determination of viscosity and density of fluids which is based on measuring fluid velocity in measuring tube for suspense of a on ball and forces actuating on another ball. A measuring tube consist of a vertical and a horizontal parts. Based on the measured values of fluids velocity and those of a force exerted on the ball by the moving fluid the viscosity and density are determined. It is suggested device for simultaneous measuring density and viscosity of fluids with one ultrasonic sensor in which tracking a free immersion of a ball into a stationary fluid, allows for determination of time coordinates of its movement which are related to density and viscosity. In inactive status a ball is at a bottom shop a wire mesh. A fluid is introduced into a measuring tube upwards by using a pump. A ball comes up and stops at a top stop - a position identifier and a reel which form electromagnetic stopping device (ESD). At a moment of a contact of a ball and ESD a pump stops and the ball is held in this position with the use of reel. On the base of a fixed distance between a matched piezoelectric converter of an ultrasonic sensor (US) and ESD a velocity of ultrasound in medium. After this a current feed to ESD is switched off by a computing and control device (CCD) and a ball falls into a stationary medium. Being conducted by the CCD, the US pulses short time ultrasonic waves into medium with definite periodicity US registers a time of reflected waves - arrival from moving ball and sends it to CCD. Based on the obtained time values, coordinates, velocity and acceleration which are functionally connected with viscosity and density of fluid are determined. The process of measurement with US is conducted after loss of contact of fluid boundary level from the ball. The suggested approach to measurement allows to decreases of length of measuring tube. A solution of the equation of the ball's moving when be immersed into a fluid is given on the base of application of physical quantities and phenomena. So, the suggested system and devices allow to determine main physical parameters of fluids and to automatize a determination of molecular weight of polymer.