Real-Time Free Chlorine Sensor

The Sensorex (USA) FCL’s precise amperometric sensor measures free chlorine in real time and is available in three different measurement ranges: 0-2ppm, 0-5ppm and 0-10ppm. The sensor’s long-life design reduces maintenance cycles, which lowers lifecycle costs with less frequent sensor membrane cap/solution replacement and reduced technician installation time.

After hypochlorous acid (HOCl) diffuses through the FCL sensor’s membrane, it is electrochemically reduced, releasing electrons and creating a current flow proportional to the free chlorine concentration in the medium outside the sensor. The low current output is then conditioned to a 4-20 mA direct output. The FCL’s sensor operates in a range of 4-11 pH, a temperature range of 0-45°C (32-113°F) and at a maximum pressure of 14.7 psig (1 Bar).

The Sensorex FCL sensor is ideal for a broad range of water applications in municipal potable water treatment, municipal wastewater, industrial plants and commercial facilities. These applications include municipal intake water, wastewater effluent, swimming pools, amusement parks, food processing disinfectant stations, aquaculture,commercial property lagoons and more.

Chlorine is used in these applications as a general biocide, disinfecting water by killing pathogens, algae, bacteria and many other microbes that pose a threat to human health and may affect industrial processes. The chlorination process requires extremely accurate measurement for effectiveness and safety. If chlorine levels are too low, water may not be disinfected properly; if levels are too high, the water supply may be unpalatable and may cause other health problems.

The FCL Sensor can be used in both new and existing Sensorex FC72 Flow Cell installations. It can also be installed as a replacement for other brands of free chlorine 4-20 mA output free chlorine (FCL) sensors in flow cells from other manufacturers.