CCS50D Chlorine Dioxide Sensor Overview
CCS50D is a sensor launched by Endress+Hauser for measuring chlorine dioxide concentration in water. It is suitable for applications where chlorine dioxide is used as the disinfectant in disinfection processes and can provide accurate online measurement.
Correct commissioning is the key to ensuring long-term stable operation of the sensor. This article will introduce the commissioning steps and precautions for the CCS50D in detail.
Applicable Conditions and Selection Notes
The CCS50D is only suitable for working conditions where the disinfectant is chlorine dioxide. If chlorine gas or sodium hypochlorite is used on site, the free chlorine sensor CCS51D should be selected. Incorrect selection can lead to measurement deviation and even sensor damage.
- Applicable disinfectant: Chlorine dioxide (ClO₂)
- Inapplicable disinfectants: Chlorine gas (Cl₂), sodium hypochlorite (NaClO)
- Corresponding free chlorine sensor model: CCS51D
Before commissioning, be sure to confirm the type of disinfectant on site and select a matching sensor model.
Pre-Commissioning Preparation
The following preparation work must be completed before commissioning to ensure a smooth commissioning process.
- Check whether the sensor appearance is intact and whether the membrane cap is damaged or dry.
- Confirm that the transmitter power supply is normal and the wiring is correct.
- Prepare standard solutions or chlorine dioxide water samples of known concentration for calibration.
- Read the product manual and become familiar with the transmitter operation menu.
Commissioning Steps
1. Sensor Installation and Polarization
Install the sensor in a flow-through cell or immersion holder, ensuring that the membrane cap is fully submerged and free of air bubbles. After power-on, the sensor needs to be polarized for a period of time (usually 30-60 minutes), and calibration can only be performed after the reading stabilizes.
2. Zero-Point Calibration
Place the sensor in clean water without chlorine dioxide (such as deionized water or activated carbon filtered water), and perform zero-point calibration after the reading stabilizes. Excessive zero-point drift will affect measurement accuracy.
3. Slope Calibration
Use a chlorine dioxide standard solution of known concentration for slope calibration. Immerse the sensor in the standard solution, and after the reading stabilizes, enter the standard value; the transmitter automatically calculates the slope.
4. Parameter Settings
Set the measuring range, alarm limits, temperature compensation, and other parameters according to process requirements. For specific settings, please refer to the transmitter manual.
Comparison Between CCS50D and CCS51D
The following table lists the main differences between the CCS50D and CCS51D for convenient selection reference.
| Item | CCS50D | CCS51D |
|---|---|---|
| Measurement parameter | Chlorine dioxide (ClO₂) | Free chlorine (Cl₂/HClO/ClO⁻) |
| Applicable disinfectant | Chlorine dioxide | Chlorine gas, sodium hypochlorite |
| Typical application | Chlorine dioxide disinfection process | Chlorine disinfection process |
Common Issues and Precautions
- Unstable reading: Check whether the membrane cap is contaminated and whether the electrolyte is depleted. Replace the membrane cap and electrolyte if necessary.
- Calibration failure: Confirm that the standard solution concentration is accurate and the temperature is suitable, and ensure that the sensor is fully polarized.
- Low measured value: This may be caused by a blocked membrane cap or insufficient flow. Please check the flow rate of the flow-through cell.
- Sensor life: According to water quality and working conditions, replace the membrane cap and electrolyte regularly, usually performing maintenance every 3-6 months.
Following the above steps and precautions can ensure the long-term stable operation of the CCS50D chlorine dioxide sensor. For more intuitive guidance, refer to the commissioning video on the official Endress+Hauser YouTube channel.