The BLC10X controllers are low-cost electronic level controllers / indicators available for DIN-rail and panel mounting. They employ measurement of electrical conductivity of the liquid between electrodes or between electrode and metal vessel case. BLC10X are applicable for liquids with relatively high conductivity that are normally used in chemical, paper, food, wine, biotechnological industries, etc. The level indicator BLC10X allows monitoring 1 or 2 fixed levels, and BLC10Xallows monitoring 1, 2, or 3 fixed levels. When each level is reached, the corresponding relay is activated or deactivated (drainage / supply control). BLC101 is also available as a drainage or supply level controller with alarm relay (see model BLC105). The BLC10Xlevel indicator / controller is based on a high-tech microprocessor circuit, guaranteeing accuracy and stability, preventing electrolytic polarization, and ensuring stable operation. The direction of relay action at level reach as well as the connection (dependence) between levels is programmable. Output relays may be used for signaling reached level or controlling electrical actuators. The possibility to adjust output activation threshold as well as the LED indication makes the BLC10X level indicator a solution for a wide range of level related problems.