Versatile ClO2 Sensor

Offering real-time chlorine dioxide (ClO2) measurement with an advanced amperometric sensor, the CLD Series Chlorine Dioxide Sensor from Sensorex (USA) is a flexible, low maintenance solution for applications including water treatment disinfection and chlorine dioxide generators.

The CLD Series Sensor is available in both 0-2 ppm and 0-10 ppm measurement ranges for real-time, amperometric chlorine dioxide measurement with a 4-20 mA output. 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.

The CLD Sensor installs easily via the Sensorex FC72 flow cell with 0.25-inch FNPT threads or can be installed as a direct drop-in replacement for other ClO2 sensors. The CLD’s sensor operates over a range of 4-11 pH, at temperatures from 0-45°C (32-113°F) and at a maximum pressure of 14.7 psig (1 Bar).

Chlorinedioxide is an extremely potent biocide and is used to destroy harmful pathogens such as the SARS virus and the Legionella bacterium. It has unique chemicalproperties that set it apart from chlorine – it is 10 times more soluble in water (at 3.01 gram/Liter at 25°C) and doesn’t hydrolyze when placed in solution. As a “true” dissolved gas it is able to retain its unique oxidative and biocidal properties throughout a wide pH range. Chlorine dioxide is ideal for a broad variety of water applications, including municipal drinking water disinfection and industrial applications such as food processing and industrial process water treatment.

After ClO2 diffuses across the CLD Sensor’s hydrophobic silicone membrane separating the cathode and electrolyte solution, it is simultaneously electrochemically reduced at the gold cathode and oxidized at the silver anode. The release of electrons at the cathode and acceptance at the anode creates a current flow, which, under constant conditions, is proportional to the chlorine dioxide concentration in the medium outside the sensor. The sensor’s on-board electronic circuitry then conditions the resulting low current output to a 4-20mA signal.

The CLD Sensor can be installed in conjunction with Sensorex’s FM001 Flow Meter is to condition the liquid flow for superior levels of system stability. Combining a flow meter with the CLD sensor results in high levels of measurement accuracy.

The 4-20mA output signal produced by the CLD Series is compatible with both Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCS) to easily support a wide range of applications from small stand-alone, single-point measurement stations to large plant wide network systems. It is constructed from rugged Black PVC and includes a specialized acrylic flow cell (Model FC72) to control and stabilize the flow environment.