Chlorine Dioxide (ClO2) Measurement Versatile ClO2 Sensor Combines Reliable Performance With Low Maintenance

Editor: Dr. Jörg Kempf

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

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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. (Picture: Sensorex)
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. (Picture: Sensorex)

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 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).

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.

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