KCD602 Online COD Sensor No Reagents No Pollution Small Size for Water Quality Monitoring

Many organic substances dissolved in water absorb ultraviolet light. Therefore, by measuring the absorption of these organic substances by ultraviolet light at a wavelength of 254 nm, the total amount of dissolved organic pollutants in water can be accurately measured. The KCD602 online COD sensor uses two light sources, one 254 nm ultraviolet light and one 365 nm ultraviolet reference light, which can automatically compensate the optical path attenuation and eliminate the interference of the granular suspended matter enamel to a certain extent, thus achieving more stable and reliable.

• No reagents, no pollution, more economical and environmental protection
• Small size, easy installation, and continuous water quality monitoring
• Measure COD, turbidity and temperature parameters
• Automatic compensation for turbidity interference
• With a cleaning brush to prevent bio-adhesion
• Small drift, fast response, more accurate measurement
• Excellent stability even for long-term monitoring
• Maintenance-free, long service life and low cost of use
• Digital sensor, RS-485 interface, Modbus/RTU protocol
• Low power design, anti-interference design

When the sensor is attached, the sensor caused by water flow should be prevented from hitting the wall or other water conservancy facilities. If the water flow is very urgent, fix the sensor.

Install the sensor to a depth of no more than 2 meters from the water surface.

Taking into account the fluctuation of the water level, the sensor is immersed in the lowest possible water level below 30 cm.

The sensor is placed in a position where there are no bubbles in the water.

• Install a cable protector outside the sensor cable.
• The sensor should be positioned horizontally and securely .The measuring area faces the flow direction.

• Red line—power cable(12-24VDC)
• Black line—Ground wire(GND)
• Blue line—485 A
• White line—485 B
• Bare wire— shield

After wiring is completed, it should be carefully checked to avoid damage to the sensor caused by incorrect wiring.

Cable specification:Considering that the cable is immersed in water (including sea water) for a long time or exposed to the air, the cable has a certain degree of corrosion resistance. The outer diameter of the cable is Φ6 mm and all interfaces are waterproof.

6.1.1 Maintenance Schedule

To ensure accurate measurements, cleaning is important, and regular sensor cleaning helps data stability.

Note: The maintenance frequency in the above table is only a recommendation. Please maintain the sensor according to the actual usage of the sensor.

6.1.2 Maintenance Method

1)Sensor outer surface: Clean the outer surface of the sensor with tap water. If there is still debris left, wipe it with a soft, damp cloth. For some stubborn dirt, add some household washing liquid to the tap water to clean it.

2)Check the cable of the sensor: the cable should not be tightened during normal operation. Otherwise, the cable inside the cable may be broken, causing the sensor to malfunction.

3) Check if the sensor's measurement window is dirty and the cleaning brush is normal.

4) Check the sensor's cleaning brush for damage.

5) For 18 months of continuous use, it is necessary to return to the factory to replace the dynamic sealing device.

1.3 Precautions

The probe contains sensitive optical and electronic components. Make sure the probe is not subject to severe mechanical shock. There are no parts inside the probe that require user maintenance.

6.2.1 Turbidity Calibration:

1. Zero calibration: Take a small amount of turbidity liquid from a large beaker and place the sensor vertically in the solution. After 3 to 5 minutes, the value is stabilized and then zero calibration. The instructions refer to the appendix.
2. Slope calibration: Place the sensor in a solution and place it in a 100 NTU standard solution. After 3 to 5 minutes, the slope is calibrated after the value is stabilized. The instructions refer to the appendix.

6.2.2 COD Calibration:

1. KHP(Potassium hydrogen phthalate , C8H5KO4) , As a commonly used stain for environmental research, it can be used for COD calibration.
2. Preparation of standard solution
   1. Accurately weigh 0.8503 g of KHP into a 1000 ml flask. Distilled or deionized water and perfused until the highest scale. This solution is a 1000 mg / L COD solution.
   2. Take 100 ml of this solution into a 1000 ml flask and fill it to the highest mark with distilled or deionized water. After shaking, the COD concentration was 100 mg/L. A solution having a concentration of 5 mg/L was prepared in the same manner.
   3. The concentrated standard solution (step 2.1) was stored in a black glass vial and stored at low temperature to prevent decomposition. The diluted standard (step 2.2) needs to be used within 24 hours of preparation.

6.2.3 Calibration (2-point calibration)

1. 0～200mg/L calibration

Place the sensor in a 5mg/L COD solution and verify that all light paths are submerged under water >2cm with no air bubbles. Perform a zero calibration according to the appendix command.

2. 0～500mg/L calibration

Place the sensor in a 20mg/L COD solution and verify that all light paths are submerged under water >2cm with no air bubbles. Perform a zero calibration according to the appendix command.

• KHP is a cancer risk and should be worn with gloves.
• When calibrating, firstly calibrate the temperature, then calibrate the turbidity and then calibrate the COD.
• If the slope is calibrated, the sensor value does not change within 3 minutes,re-supply after power is cut off.

• Avoid the sun exposure of the sensor
• Please do not touch the sensor by hand
• Avoid contact with the sensor surface during measurement and calibration
• Avoid using any mechanical stress (pressure, scratches, etc.) directly on the sensor during use.

• The quality inspection department has standardized inspection procedures, advanced and perfect testing equipment and means, and strictly in accordance with the regulations, 72 hours of aging experiments and stability tests on the products, and does not allow a substandard product to leave the factory.
• The receiving party directly returns the batch of products with a non-conformity rate of 2%, and all the costs incurred are borne by the supplier. The reference standard refers to the product description provided by the supplier.
• Guarantee the quantity of goods and the speed of shipment.

This product includes:

• Sensor
• Instruction manual
• Certificate

The company provides local after-sales service within one year from the date of sale, but does not include damage caused by improper use. If repair or adjustment is required, please return it, but the shipping cost must be conceited. Damaged on the way, the company will repair the damage of the instrument for free.