be likewise of any conventional type such as a displacement pump a control valve or the like in general as those skilled in the art appreciate the mixture of unreacted material plus polymer from the reaction zone is treated in the separation zone so as to separate the unreacted material from polymer the unreacted material need not be but usually does contain a significant percentage of unreacted monomer along with optionally or preferably depending on circumstances additional quantities of low molecular weight polymer diluents which are preferably liquid and solvents for either the monomer or the polymer and catalysts and the like preferably mass polymerization is used the unreacted material is separated from polymer in the separation zone sometimes several separation zones in a series or parallel relationship one to the other may be employed depending upon the efficiency of separation throughput rates economic considerations and the like the conditions of polymerization and the conditions of separation and the choice of flow regulating means are generally not part of the present invention are well known to the prior art and do not form a part of the present invention so no detailed individual description thereof is given herein the flow of unreacted material separated from the polymer in the separation zone for purposes of the process of the present invention is measured once the flow rate has been measured a signal representative of the flow rate is generated.