โ Scribed by R.H.O.
No coin nor oath required. For personal study only.
a continuous analysis of flowing streams of fluids and gases, together with automatic control of those processes, give promise of advances for the chemical industry.
This was recently revealed in a paper presented before the annual meeting of the Institute of Chemical Engineers. The speaker was Everett S. Lee, chief engineer of General Electric's General Engineering and Consulting I.aboratory at Schenectady, N. Y.
Speaking on "New Process Control Instruments for the Chemical Industry," Mr. Lee described several instruments recently developed "which measure basic quantities to give opportunity for continuous analysis of a flowing process stream." He asserted that chemical industry spokesmen long have pointed to such devices as the industry's greatest need in the field of instrumentation. "A particularly interesting example of the new process control instruments for the chemical industry is the X-ray photometer, which provides economical and rapid means of making chemical comparisons," Mr. Lee said. "With this instrument it has been found possible to determine satisfactorily the tetraethyl lead content of gasoline, the concentration of an acid in water, the per cent chlorination of a plastic, or the per cent ash in coal. These determinations are made by measuring and comparing X-ray absorption of a sample and a reference."
An outstanding advantage of this method of comparison lies in the fact that X-ray absorption always is the same for a given material, whether it is hot or cold, gaseous, liquid, or solid, or whether the element being measured is alone or in chemical combination. Too, analysis is made without loss or alteration of the sample tested.
R. H. O.
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New Control Instruments.--Two new instrument lines--termed Speedomax "Type H" controllers and "Series 60" Proportional-Control Units-are announced by Leeds & Northrup Co