The WIS-1 is used to detect the presence of water by providing a relay signal to any monitoring unit. The WIS-1 operates on 12VDC and functions as a normally closed switch. The unit can detect a layer of water of 1.6mm (1/16in) in depth.
Theses units should be tested with water after installation and checked every year thereafter. The WIS-1 comes standard with a 6 feet jacketed lead.