The Model WLS Water Level Switch is a float operated device for supervising water level in a sprinkler supply gravity or pressure tank. The Model WLS has a bushing with 1 1/2” American Standard Pipe Threads for mounting in steel tanks. A 11/2” NPT x 2” NPT adapter bushing is available for mounting in existing 2” steel flanges. An optional bushing adapter with a buttress thread is available for mounting in wooden tanks.
The unit is capable of detecting the level of water before a 3” (7,6cm) rise and/or a 3” (7,6cm) fall in the water level in a pressure tank, as required for NFPA 72. The cover is held in place with two tamper resistant screws (provided), which require a special key for removal