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a xylem lxand Issued: 03/2012 Supersedes: 03/2010 Flygt FLS Sensor Family DESCRIPTION The FLS(sometimes referred to as FLS-20)is a sensor designed to detect water presence into the stator housing.FLS is designed for CP/DP model pumps,which are installed in a vertical position. The Float Leak Detector is an electro-mechanical type device.It has a rigid aluminum frame,with two small fixed resistors.Two wires are provided for device connection. Inside the frame,a mobile stainless steel float element can move up and down guided by a shaft.The float contains a permanent magnet which,on the uppermost float position,causes the "reed-switch"closure. .. t Illustration I: Float leak Illustration 2: FLS-10 Detector Illustration 3: FLS Note: When ordering FLS leakage sensor,a MiniCASII er- "ter unit should be ordered with the pump. MODE OF OPERATION In normal conditions,the float element will rest at the bottom of the frame.Across the connection wires,the Float Leak Detector and FLS resistance is about 1500 ohms. When water or any liquid enters the stator housing,the float element and magnet will raise and finally touch the upper side of the frame.The"reed-switch"will close and add a 375 ohms resistor in parallel with a 1500 ohms resistor.The resulting resistance across Float Leak Detector/FLS leads is 300 ohms. 430 ohms in series wM a:770 ohm msisten Alith fie leakage,the r-esis4Emee meastwed should be afeend 1200 ohms -W leakage eeetir-s the"reed switeh"will elese and dr-ep eta the 770 Ohm resistor-4efft the eir-euit r-estilting in a r-esistaffee valti e f Avi 30 Oh s.