Page 2 of PP conductivity measuring cell with flow-through measuring vessel by Metrohm AG

depending on the tolerable measurement error an open vessel suffices if necessary under an argon atmosphere or the measurement must be performed in the flow-through mode for instance in precision measurements error <1 below 100 µs/cm figure 5 shows the conductivity values of one and the same solution measured in an open vessel and in the flowthrough vessel use of the flow-through measuring vessel completely eliminates the co2 influence on the conductivity measurement thus allowing measurements well below 1 µs/cm thanks to the chemical resistance of the materials used ­ glass and teflon ­ the flow-through measuring vessel is also suitable for the investigation of corrosive media the measuring vessel can accommodate sensors with a diameter of 12 mm fig 3 measured specific conductivity of pure h2o as a function of the saturation with co2 of the ambient air specified in atmospheric co2 measuring instrument with a cell constant of approx 1 cm­1 the measuring instrument must be able to record a high resistance precisely when analyzing ultrapure water thanks to the outstanding resolution of the 712 conductometer in the low conductivity range with the pp conductivity cell correct and accurate measurements well below 1 µs/cm are possible despite the relatively high cell constant c 0.8 cm­1 fig 4 error in the measurement of the specific conductivity at different saturation levels with co2 of the ambient air fig 5 specific conductivity of ion exchanger water at 20 °c as a function of the measurement time in an open vessel and in the flow-through mode at a volume flow of 80 ml/min 6.0912.110 pp conductivity cell 6.1420.100 flow-through measuring vessel

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