KCD310 Online COD Sensor no reagents no pollution small size more convenient COD turbidity and temperature

1.Principle

Many organic compounds dissolved in water absorb ultraviolet light. Therefore, the content of dissolved organic pollutants in water can be accurately measured by measuring the absorption of these organic compounds to 254 nm wavelength UV light. KCD310 online COD sensor uses two light sources, one ultraviolet light to measure COD content in water, the other reference light to measure turbidity of water, in addition, the optical path attenuation is compensated by a special algorithm, which can eliminate the interference of particulate impurities to a certain extent, so as to achieve a more stable and reliable measurement.

2.Features

• No reagents, no pollution, economic and environmental protection
• Small size, more convenient installation, online continuous water quality monitoring
• Cod, turbidity and temperature can be measured
• Automatically compensates for turbidity interference
• With a cleaning brush to prevent biological adhesion
• Small drift, fast response, more accurate measurement
• Even long-term monitoring is extremely stable
• Maintenance-free, long service life and low cost
• Digital sensor, RS-485 interface, Modbus/RTU protocol
• Low-power electronics, anti interference design

3.Technical Specifications

4.Dimensional Drawing

Note: Sensor Connector is M16-5 core waterproof connector

5.Installation and Electrical Connection

5.1 Installation

When hanging sensor should avoid because of the flow of water, install sensor, not more than 2 meters from the water surface depth Into a sensor that hits a wall or other hydraulic structure, If the current is very strong, please fix the sensor.

Install the sensor no more than 2 meters from the water surface.

The sensor was lowered 30cm below the lowest possible water level, taking into account the fluctuation of water level.

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

It is recommended to install a cable sheath outside the sensor cable. The sensor is positioned horizontally and firmly, and the measuring area is oriented toward the current.

5.2 Electrical Connection

The cable is a 4-core twisted pair shielded wire defined in line sequence:

Red wire -- power cord (12 ~ 24VDC)

Black line (GND)

Blue Line -- 485a

White line -- 485b

Before electrification, the wiring sequence should be carefully checked to avoid unnecessary losses caused by wiring errors.

Wiring instructions: Consider the cable long-term immersion in water (including seawater) or exposed to air, all wiring are required to do waterproof treatment, customer cable should have a certain anti-corrosion ability.

6.Maintenance

6.1 Maintenance Schedule and Methods

Maintenance Schedule

In order to ensure accurate measurement, cleaning is very important, regular cleaning of the sensor, contribute to the stability of data.

Note: the maintenance frequency in the above table is only recommended. Please clean the sensor according to the actual usage of the sensor.

Maintenance Method

1) sensor surface: clean the sensor surface with tap water. If debris remains, wipe with a damp soft cloth. For stubborn dirt, add some household detergent to the tap water to clean.

2) check the wire of the sensor: the wire should not be taut when it is working normally, otherwise it is easy to break the wire inside the wire and cause the sensor can not work normally.

3) check if the sensor’s measuring window is dirty and the cleaning brush is normal.

4) check the sensor brush for damage.

5) after 18 months of continuous use, return to factory to replace the dynamic sealing device.

Points to Note

The probe contains sensitive optical and electronic components. Make sure the probe doesn’t get hit by any heavy machinery. There are no parts inside the probe that require user maintenance.

6.2 Calibration of Sensors

Turbidity Calibration

Zero calibration: take the right amount of zero turbidity liquid with the Big Beaker, put the sensor in the solution vertically, and calibrate the zero point after 3 ~ 5 minutes of numerical stabilization. Instruction Reference Appendix.

Slope calibration: the sensor is placed in a solution in 100NTU standard solution for 3 ~ 5 minutes after numerical stabilization. Instruction Reference Appendix.

Cod Calibration

Khp (Potassium hydrogen phthalate, C8H5KO4) is a common chemical reagent, which can be used to prepare COD standard solution.

Preparation of standard solution

1 accurately weigh 0.8503g KHP into 1000ml flask. Fill with distilled or deionized water to the highest level. This solution is 1000 mg/l COD solution.

2 pour 100 mL of the solution into a 1000 mL flask, then fill to the highest level with distilled or deionized water. After shaking, the concentration of COD was 100 mg/L. The solution with concentration of 5 mg/L was prepared by the same method.

Store the concentrated standard solution (step 2.1) in a black glass bottle and store at low temperature to prevent its decomposition. Diluted standard solution (step 2.2) should be used within 24 hours of preparation.

Calibration (2 point calibration)

1 the sensor was placed into 5 mg/L COD solution, and all light paths were confirmed to be immersed in water > 2 cm without bubbles. Zero calibration as per appendix command.

2 put the sensor into 100MG/L COD solution and calibrate the slope according to the appendix command.

Note: 1. KHP has carcinogenic risk, please wear gloves when operating, avoid contact with skin.

2. When calibrating, first calibrate the temperature, then calibrate the turbidity, then calibrate the COD.

3. If the slope is calibrated and the sensor value does not change within 3 minutes, power off and power back on.

Points to note

To protect the sensor from the Sun

Please do not touch the sensor with your hand

The surface of the sensor is free from air bubble during measurement and calibration

Avoid directly applying any mechanical stress (pressure, scratches, etc.) to the sensor during use

6.3 Frequently Asked Questions

7.Quality and Service

7.1 Quality Assurance

Quality inspection departments have standardized inspection procedures, with advanced and perfect testing equipment and means, and in strict accordance with the rules of inspection, 72-hour aging of products to do experiments, stability experiments, do not let a unqualified product factory.

The consignee will return the lot of the product with 2% nonconformity rate, and all the cost will be borne by the supplier. The standard of consideration refers to the product description provided by the supplier.

Guarantee the quantity and speed of delivery.

7.2 Spare Parts

This product includes:

1 sensor

1 copy of instruction manual

Certificate 1

7.3 After-sales Service Commitment

Our company provides after-sale service for one year from the date of sale, but does not include damage caused by improper use. If repair or adjustment is needed, please return it at your own expense, the company will repair the damage of the instrument free of charge.

Xi'an Kacise Optronics Co.,Ltd. is a professional manufacturer of  measuring instruments , located in China xi’an City. Since 2008, Xi'an Kacise focused on the development and production of pressure, level and flow measuring instruments .

We have been specializing in manufacturing pressure, level and flow measuring instruments and related products for 10 years. Based on experienced technical and management personnel, through efforts of our entire staff, we have become a professional measuring instrument manufacturer and solution provider. And we are continuously trying to improve product quality.

Xi'an Kacise is qualified with ISO 9001-2008, GJB 9001B-2009, CE, intrinsic safety explosion-proof and isolated safety explosion-proof certificates, etc. which ensure that our products comply with international standards.

Kacise sensors have already been exported to America, Spain, Australia, Chile and 20 other countries and regions, and received many favorable feedbacks. Our overseas distributers are also increasing. We regard “reasonable prices, efficient production time and good after-sales service” as our tenet, and hope to cooperate with more customers for mutual development.

Our goal is simple: to sell the best products at the best prices, and provides industry-leading customer service. We personally get to know each of our customers, and we know how to discover the most valuable part of our business , to help others achieve their goals.