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Conductivity Sensors

Conductivity Sensors. Stacy Young Megan Boekeloo. Conductivity Equations. C = κ / Λ Λ = molar conductivity [S m 2/kmol] κ = conductivity [S] C = concentration [kmol/ m 3]. κ = (A/x) * (1/R) κ = conductivity [S] A = area of electrode [ m 2] x = distance between electrodes [m]

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Conductivity Sensors

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  1. Conductivity Sensors Stacy Young Megan Boekeloo

  2. Conductivity Equations C = κ / Λ Λ = molar conductivity [Sm2/kmol] κ = conductivity [S] C = concentration [kmol/m3] κ = (A/x) * (1/R) κ = conductivity [S] A = area of electrode [m2] x = distance between electrodes [m] R = resistance [ohm, Ω] C = [(A/x) * (1/R)] / Λ

  3. Sensor Types 2-electrode cell • Most commonly used • Glass cells • Platinum electrodes • Epoxy cells • Graphite electrodes • Easy to clean electrodes Images from: http://www.topac.com/conductivityprobes.html

  4. Sensor Types • 4-electrode cell • Alternating current on outer electrodes • Inner electrodes measure voltage • Superior function • No fouling • No polarization error Images from: http://www.topac.com/conductivityprobes.html

  5. Sensor Types Submersible Probes • Continuous monitoring • Integral resistance thermometer • Platinum electrodes Image from: http://www.pulseinstruments.net/index.asp?PageAction=VIEWPROD&ProdID=1243

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