By Joel B. Fowler, Michael A, Lind, Edward F. Zalewski
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Extra resources for A Servo Controlled Electro-Optic Modulator for cw Laser Power Stabilization and Control
Modern transmitters for conductivity measurement in highpurity water automatically take account of these relationships in the temperature compensation. 1 0 0 5 10 15 20 25 30 35 40 50 60 70 80 Concentration in % by weight at 20 °C KCl HCl H2SO4 NaOH Fig. 17: Relationship between conductivity and concentration (for various substances) A conductivity measurement does not give any information on the nature of the dissolved substances. The measured value could have been produced by any ions. For solutions with a varying or unknown composition, the measured conductivity is a substitute for a concentration value.
Morash K. , Thornton R. D. …, Measurement of the resistivity of highpurity water at elevated temperature, Ultra-pure water journal, 1994 ! United States Pharmacopeia, (USP), water conductivity <645> in the currently valid version ! de ! Wu Y. , Absolute Determination of Electrical Conductivity for Primary Standard KCl Solutions from 0 to 50°C, Journal of Solution Chemistry, Vol. 20, No. 2 Sample calibration certificate for a transmitter 52 JUMO GmbH & Co. net FAS 624 JUMO Instrument Co. Ltd. uk JUMO PROCESS CONTROL INC.
That is why the conductivity measurement takes place in the actual flow. The material of the measuring cell and the flow-through container must not themselves influence the conductivity, as is the case, for example, when glass is used. Measuring cells and containers made from stainless steel have proved themselves as the best choice for this application. High-purity water has a very low conductivity value. 01cm-1, is an essential requirement for an adequate measurement signal of the measuring cell.
A Servo Controlled Electro-Optic Modulator for cw Laser Power Stabilization and Control by Joel B. Fowler, Michael A, Lind, Edward F. Zalewski