Conductive level switches

The NE conductive level switch can be used to monitor the level of weakly to strongly conductive liquids. The device works through measurement of the electrical resistance between a sensing electrode and a reference electrode. This design incorporates no moving parts and makes this device especially suitable for difficult applications, such as monitoring the level of low density liquids, high viscosity liquids, or liquids containing large quantities of suspended particulates. The basic NE comes with either one or two electrodes, depending on whether the user has selected to use the container walls (for conductive containers only) as the reference electrode or has opted to obtain a second immersed electrode to serve as a reference. in this configuration, the user may monitor a single level setpoint. Up to six conductive electrodes may be mounted on each NE, making a total of six setpoints possible. A complete NE level switch system consists of a reference electrode, a sensing (control) electrode, and a relay/power supply. The NE level switch is available in a wide variety of materials. Through selection of the proper electrode, concentrated hydrochloric, sulfuric, hydrofluoric, or nitric acids present no difficulty. Even with impure media, or in cases where mist forms, faultless function is assured if completely coated electrodes are installed.