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Sensorex FCL5 Free Chlorine Sensors

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Sensorex FCL5 Free Chlorine Sensors

Price on request

The Sensorex FCL series (free chlorine sensors) is designed for disinfection applications in water treatment. The series feature amperometric measurement technology and includes built-in temperature compensation.

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Chlorine exists in different chemical forms in solution, including free chlorine (hypochlorite ion and hypochlorous acid) and combined chlorine. Free chlorine is the only form that can perform disinfection, so knowing free chlorine concentration is critical for applications like water and wastewater treatment.
FCL free chlorine sensors from Sensorex provide a direct measurement of free chlorine in parts per million (ppm). Using field tested amperometric technology, the FCL sensors perform continuous monitoring without any additional reagents. With a direct ModBUS RS485 output, the FCL sensors can be used with any instrument accepting ModBUS input or connected directly to a PLC or SCADA.
Choose the FCL502 for 0-2ppm and FCL505 for 0-5ppm and FCL510 for 0-10ppm of free chlorine.

• Industrial wastewater
• Cooling water
• Bottle Rinsing
• Irrigation water in agriculture

Membrane cap and fill solution are easily replaceable to maximize sensor life.
Sensors should be used in new installations with the Sensorex flow cell.
An optional flow meter (FM001) is available to ensure regulated flow between 0.2 to 0.6 gpm for optimum sensor accuracy.

Additional information

Measuring range

0-2 (FCL502), 0-5 (FCL505), 0-10ppm (FCL510)

Temperature Range

0°C – 45°C

Maximum pressure

14.7 psig (1 Bar)


Bare Sensor

Available for Rent







Our sales staff are highly trained and would be happy to take your call or email to discuss any product or service. We provide obligation-free quotes on everything from single dataloggers to large monitoring programs!