| 摘要 |
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 Ground solution can be withdrawn from the probe via the vacuum tube by a vacuum generator and fresh ground solution can be drawn into the probe without removing the sensor probe from the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. |
