How to calculate a cell constant of conductivity probe
You want to measure the conductivity of a liquid in the tube? If the current distribution inside the tube is homogenius, the resistor to be measured is a cylinder with a diameter of the inside diameter of the tube. The length of the cylinder is the distance of the two voltage measurement poles, this is the Distance L in the formula. The area A is calculated from the radius of the cylinder, the inside radius of the tube.