The FCL series Free Chlorine sensors utilize amperometric technology for real time Free Chlorine measurements. Applications include water treatment disinfection and free chlorine generators. These sensors integrate a temperature element for ATC and provide a fixed temperature compensated 4-20mA output. A power supply voltage of 12-24VDC is required. The FCL-402D is designed for 0-2ppm measurements and the FCL410D features a measuring range of 0-10ppm. The newest addition to this line is the FCL-405D which measures 0-5ppm. Membrane caps are easily replaceable. Electrolyte is also available and should be used to refill the membrane cap when replaced. The sensor's body is constructed of Black PVC. A specialized acrylic flow cell (FC72) provides a controlled flow environment for stability.