◇ Overview UDK-201 series electric contact liquid level controller, is the imitation of Japanese OMRON Corporation 16F series of electrical contact liquid level controller is designed for automatic control of conductive liquid position control instruments. UDK-210 / G-type is suitable for water purification and sewage water supply and drainage automatic control. UDK-201 / GH is suitable for water and distilled water, water supply and drainage automatic control. Sheung Shui on the rise and boiler water level control is particularly applicable. The instrument is reliable and easy to install small size, low cost, easy installation and maintenance. ◇ working principle of the instrument through a conductive liquid electrode contact between the electrodes from the off state to the liquid resistance in series to produce an electrical signal, the control circuit so that the meter relay output signal to the level control. The instrument has three requirements according to the level of varying length electrode E1, E2, E3.