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Summary of Contents for Daruifuno COD351
- Page 1 Daruifuno UV Online COD Sensor Basic User Manual Model: COD351 Version 1.0...
- Page 3 Contents Chapter 1 Product Overview ....................1 Product Introduction..................2 Cable Definition....................3 Technical Parameters..................4 Chapter 2 Installation ..................5 Configuration.....................5 Installation Precautions..................5 Installation Step....................6 Chapter 3 Maintenance Schedule and Method ..............8 Maintenance Schedule..................8 Maintenance Methods..................9 Cleaning Brush Replacement................10 Chapter 4 Calibration ......................11 Brief Description....................11 Standard Solution Configuration..............11 Chapter 5 Frequently Asked Questions ................12...
- Page 4 Introduction Respected user: Thank you very much for purchasing a sensor produced by DRFN. Before you use it, please read this manual carefully, it will be of great help to the use and maintenance of this instrument, and can avoid unnecessary troubles caused by improper operation and maintenance.
- Page 5 Product Overview Chapter 1 Product Overview The COD 351 series sensor is based on the principle of ultraviolet absorption method, combined with many application experiences, and has carried out a number of upgrades and innovations on the basis of the previous generation, not only smaller in size, but also integrated with the original split cleaning brush, making installation more convenient, and Has higher reliability.
- Page 6 Product Overview 1.1 Product Introduction 6.5mm optical path appearance diagram 2.5mm optical path appearance diagram 6.5mm optical path COD structure dimension drawing...
- Page 7 Product Overview 2.5mm optical path structure dimension drawing 1.2 Cable Definition 4-wire AWG-24 or AWG-26 shielded wire. OD=5~5.5mm 1. Red—Power (VCC) 2. White - 485 data line_B ( 485_B) 3. Green—485 data line_A (485_A) 4. Black—Ground (GND) 5. Bare wire - shield...
- Page 8 Product Overview 1.3 Technical Parameter Interface Support RS-485, Modbus protocol Items 351-B 351-C Optical Path 6.5mm 2.5mm COD Range 0.5 to 450mg/L equiv.KHP 1 to 1500mg/L equiv.KHP COD Accuracy ±5% equiv.KHP ±5% F.S. equiv.KHP COD Resolution 0.01mg/L TOC Range 0.3 to 180mg/L equiv.KHP 0.4 to 600mg/L equiv.KHP TOC Accuracy ±5% equiv.KHP...
- Page 9 Installation Chapter 2 Installation Disperse the cables before proceeding. Note 2.1 Configure Standard configuration Quantity Unit Remark COD sensor Branch Protective cover Optional mounting parts Assembly adapter Cable Brush skin components Unit The following installation parts are optional Elbow, Mounting Backplate Kit, etc. 2.2 Installation Precautions 1.
- Page 10 Installation 2.3 Installation Steps Protective cover installation: 1. After taking out the sensor, you need to install a protective cover for the sensor, as shown in the figure below (4 screws on the mesh cover need to be tightened). 2. After the protective cover is installed, please install the assembly adapter as shown in the figure.
- Page 11 Installation On-site fixed installation 1. It is recommended to perform fixed installation in the following two ways (1) and (2) in the schematic diagrams; Among them, (1) the hoisting method is elbow type, which is suitable for the environment without rapid flow and water body with less debris; (2) the hoisting method is guard plate hoisting type, which is suitable for rapid flow environment and has high installation stability.
- Page 12 Maintenance schedule and method Chapter 3 Maintenance schedule and method 3.1 Maintenance Schedule Although the sensor comes standard with a self-cleaning brush, harsh working conditions will still cause the sensor to be stained. In order to ensure accurate measurement, cleaning is very important. Regular cleaning of the sensor will help the stability of the data. Maintenance tasks Recommended maintenance frequency It is recommended to clean every 3-4 weeks...
- Page 13 Maintenance schedule and method 3.2 Maintenance Method 1. Cleaning the outer surface of the sensor: Clean the outer surface of the sensor with tap water. If there is still debris, wipe it with a damp soft cloth. For some stubborn dirt, you can add some household detergent to the tap water to clean;...
- Page 14 Maintenance schedule and method 3.3 Cleaning Brush Replacement 1. The sensor is placed horizontally, and the glue brush is rotated to be parallel to the structural surface. 2. Using a screwdriver, unscrew the screw. 3. Shake the glue brush and pull out the glue brush. 4.
- Page 15 Calibration Chapter 4 Calibration 4.1 Brief Description COD 351 series sensors support one-point and two-point calibration. 4.2 Standard Solution Configuration 4.2.1 Required Utensils and Raw Materials 4.2.1.1 Appliances Analytical balance, medicine spoon, 50mL beaker, 100mL graduated cylinder, glass rod, pipette, 1L volumetric flask. 4.2.1.2 Raw Materials KHP (potassium hydrogen phthalate, C8H5KO4), CAS# 877-24-7, as a commonly used dye in environmental research, can be used for COD...
- Page 16 Frequently Asked Questions Chapter 5 Frequently Asked Questions Table 5-1 lists possible problems and solutions for COD sensors, if your problem is not listed or the solution does not solve your problem, please contact us. Abnormal Possible reason Solution Check whether the power supply Abnormal power supply and wiring and wiring are normal according Communication...
- Page 17 Warranty Instructions Chapter 6 Warranty Instructions This warranty does not cover the following: 1. Damage caused by force majeure, natural disaster, social unrest, war (published or unpublished), terrorism, civil war or any government coercion 2. Damage caused by misuse, neglect, accident or improper application and installation 3.
- Page 18 COD Sensor Commands in MODBUS RTU Chapter 7 COD Sensor Commands in MODBUS RTU 7.1 Overview In order to carry out MODBUS RTU communication with the COD probe, the MODBUS master station terminal application software is required. MODBUS RTU is an open standard and provides multiple free commercial application toolkits.
- Page 19 Get SN 7.2.2 Get SN Function: Get the identification number SN of the sensor, each sensor has a unique SN. The SN of the probe can be read from 7 consecutive MODBUS registers starting at 0x0900. Start register Register quantity Register1-7 MODBUS Function Code 0×0900...
- Page 20 Start measuring 7.2.3 Start Measuring Function: Let the sensor start measuring. Use MODBUS register 0x2500. By default, the probe starts luminescence measurement when it is powered on. Start register Register quantity MODBUS function code 0×2500 0×01 0×03 The following takes the slave device address 0x01 as an example to illustrate the request frame and response frame of the start measurement command.
- Page 21 Get temperature and COD TOC value Temperature: Get temperature request SEND: Byte count Register value Definition Address domain Function code Byte Content 0x01 0x03 0x26 0x00 0x00 0x02 0x C7 0x43 Return temperature RECEIVE: Address Function Definition Bytes Temperature ① domain code Byte...
- Page 22 Floating point numbers are stored in little endian mode Obtain software and hardware version numbers 7.2.5 Obtain Software and Hardware Version Numbers Function: Get the currently used hardware version number and software version number. The software and hardware version numbers of the probe can be read from two consecutive MODBUS registers whose starting address is 0x0700.
- Page 23 Stop measuring 7.2.6 Stop Measuring Function: When the data is stable, you can stop the measurement, if you want to measure again, you need to send the start measurement command. Use MODBUS register 0x2E00. Initial address Register quantity MODBUS function code 0×2E00 0×01 0×03...
- Page 24 Get COD user calibration parameters 7.2.7 Get COD User Calibration Parameters Function: Obtain two calibration parameters K and B of COD.(In order to prevent the value deviation caused by factors such as probe aging, the calibration formula COD final=K*COD+B, the general default value is: K=1; B=0.) User calibration parameters K, B can be read from 4 consecutive MODBUS registers starting at 0x1100.
- Page 25 Set user calibration parameter 7.2.8 Set User Calibration Parameter Function: Set two calibration parameters K and B. The user calibration parameters K and B can be set through 4 consecutive MODBUS registers starting at 0x1100. Start register Register quantity Register1, 2 Register3, 4 MODBUS function code 0×1100...
- Page 26 Get slave ID 7.2.9 Get Slave ID Function: Get the MODBUS slave device address of the current electrode, this command uses 0xFF as the fixed address field. The MODBUS slave device address of the current electrode can be read from the MODBUS register whose starting address is 0x3000.
- Page 27 Get Turbidity value 7.2.10 Get Turbidity Value Function: Obtain the turbidity value of the probe: the unit of temperature is NTU. It can be read from the MODBUS register whose starting address is 0x1200. Initial address Register quantity Register1, 2 MODBUS function code 0×1200 0×02...
- Page 28 Get Turbidity user calibration parameter 7.2.11 Get Turbidity User Calibration Parameter Function: Obtain the two calibration parameters K and B of turbidity, and proceed in deionized water. The turbidity user calibration parameters K and B can be read from 4 consecutive MODBUS registers starting at 0x3400. Initial address Register quantity Register 1, 2...
- Page 29 Set Turbidity User Calibration Parameters 7.2.12 Set Turbidity User Calibration Parameter Function: Set two calibration parameters K, B Turbidity user calibration parameters K, B can be set through 4 consecutive MODBUS registers starting at 0X3400. Initial address Register quantity Register 1, 2 Register 3, 4 MODBUS function code 0×3400...
- Page 30 Turn on the brush 7.2.13 Turn on the Brush Function: Let the brush start to rotate. It is recommended to turn on the brush once when the power is turned on (default is off). The starting address is 0x3100 to start the brush rotation. Initial address Register quantity MODBUS function code...
- Page 31 Set the brush rotation interval 7.2.14 Set the Brush Rotation Interval Function: set the interval of the brush rotation, the unit is min. The brush rotation interval can be set through a MODBUS register whose starting address is 0x3200. Initial address Register quantity Register 1 MODBUS function code...
- Page 32 Obtain the brush rotation interval 7.2.15 Obtain the Brush Rotation Interval Function: obtain the interval of the brush rotation, the default is every 30 minutes. The rotation interval of the brush can be read from 1 MODBUS register whose starting address is 0x3200. Initial address Register quantity Register 1...
- Page 33 The process of testing the COD value The Process of Testing the COD Value Processing flow Delay≥6s Power-on Corresponding frame command Delay≥6s Obtain temperature and COD Obtain temperature and COD Obtain temperature and COD Delay≥2s ＞10 times Perform display or other processing Get the temperature, COD, TOC, get the temperature of the probe (in degrees Celsius), and the COD value and TOC (in mg/L), execute this command with a delay of 6s after starting the measurement command, and then repeat this command every 2s.
- Page 36 Delfino Environmental Technology Co., Ltd. www.daruifuno.com info@daruifuno.com...
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