More About EC
EC stands for Electrical Conductivity. We measure EC with an EC meter or EC electrode designed for measuring EC in liquids. In general conductivity meters have 2 electrodes that are spaced apart. A current will pass from one electrode to the other and the microprocessor of the EC meter will calculate exactly how conductive the liquid is. This will then be displayed on the LCD display of the EC meter in either millie siemens or micro siemens.
An EC meter measures the potential for an electrical current to be transported through water. This is known as molar conductivity (electrolytic conductivity) and is measured in siemens (S). Electrons are able to flow through the water from one set of electrodes to another not because of the water molecules themselves, but because of the ions dissolved in the water. It is these ions that transport the electrons.
By the same token, the concentration of ions in the water also determines the number of electrons that can travel from one electrode to the other: the higher the concentration of ions, the greater the flow of electrons. Pure water is a very poor conductor of electricity, which is why an EC meter will read 0.0 in rainwater, reverse osmosis water or de-mineralized water. Salty seawater, on the other hand, is a much better conductor.
When we add nutrients (salts) to water, we increase the molar conductive potential for current through water and thus increase the EC value (or CF = EC*10). All conductivity measurements are directly affected by temperature and this must be allowed for when making them.
EC Meter Calibration
EC Meters are calibrated with conductivity standard. You can purchase our premium Meytec conductivity standard here for the most accurate calibration of your EC Meter and EC Electrode.