Abstract: A probe for monitoring electrical conductivity of ground water in soil is provided. The probe includes a hollow tube that includes (a) an upper tube section with an apertured stopper, (b) a lower tube section, aligned with the upper tube section and having a porous ceramic cap for inserting into soil, and (c) a T-fitting connecting between the tube sections and having an apertured T-fitting stopper. A vacuum tube is inserted through the T-fitting stopper aperture; and a conductivity sensor electrode is inserted through the upper tube section stopper aperture. The conductivity sensor electrode includes a pair of electrode poles that are spaced apart at a distance of 3-5 mm and the distance between the conductivity sensor electrode and the hollow tube is greater than 3 mm, whereby interference by air bubbles in the ground water is mitigated.

Abstract: A probe for monitoring electrical conductivity of ground water in soil is provided. The probe includes a hollow tube that includes (a) an upper tube section with an apertured stopper, (b) a lower tube section, aligned with the upper tube section and having a porous ceramic cap for inserting into soil, and (c) a T-fitting connecting between the tube sections and having an apertured T-fitting stopper. A vacuum tube is inserted through the T-fitting stopper aperture; and a conductivity sensor electrode is inserted through the upper tube section stopper aperture. The conductivity sensor electrode includes a pair of electrode poles that are spaced apart at a distance of 3-5 mm and the distance between the conductivity sensor electrode and the hollow tube is greater than 3 mm, whereby interference by air bubbles in the ground water is mitigated.

Abstract: A probe for monitoring electrical conductivity of soil solutions is provided. The probe includes an upper hollow tube section stoppered at one end, a lower hollow tube section capped at its bottom with a porous ceramic material for inserting into soil, a T fitting connecting the other end of the upper hollow tube section in vertical alignment with the lower hollow tube section, said T fitting having an aperture which is stoppered, an electric conductivity (EC) sensor electrode inserted through the stopper of the upper hollow tube section into the lower hollow tube section, and a vacuum tube inserted through the stopper of the aperture of the T fitting extending into the lower hollow tube section. Ground solution can be withdrawn from the probe via the vacuum tube by a vacuum generator and fresh ground solution can be drawn into the probe without removing the sensor probe from the probe.