DR-CL-2ML, DR-CL-10ML -- Integrated Residual Chlorine Sensor

1. Introduction

DR-CL is a device for measuring the residual chlorine concentration (hypochlorous acid, hypochlorite ion concentration) in water.

1.1 Specification:

• Power Input: DC7~30V

• Power Consumption : 0.19W

• Interface: RS485. 9600 Baud Rate

• CL Range & Resolution:

  • CL2ML: 0-2mg/L
  • CL10ML: 0-10mg/L
  • Resolution: 0.01mg/L

• CL Accuracy: ±5% FS

• Working environment:

  • Ambient Temperature: 0--50°C
  • pH:4-9
  • Flow rate: 30L/h~60L/h (flow tank installation)

• IP Rated: IP68

• Max Pressure: 0.6MPa

• Wire length: 5 meters

1.2 Wiring

1.3 Mechinical Drawing

1.4 Installation

Flow-through installation: Use the matching flow slot for installation. The device and the flow slot are installed tightly.

The measuring end is completely immersed in the measured liquid to ensure a steady flow rate without bubbles.

It is recommended that the flow rate be controlled at 30-60Lh to ensure the accuracy of the test.

1.5 Maintenance

• The device itself generally does not require daily maintenance. When an obvious fault occurs, please do not open it and repair it yourself, and contact us as soon as possible!
• After using the electrode, please clean the electrode head with clean water and cover it with a protective cover.
• When measuring the device, the measured liquid should flow and the flow rate should be uniform, and there should be no bubbles attached to the measuring end of the device.
• If the electrode diaphragm is attached with dirt and mineral components, the sensitivity will be reduced, and it may not be possible to perform sufficient measurement. Please ensure that the platinum ring is clean.
• The platinum induction ring of a good residual chlorine electrode should always be kept clean and bright. If the platinum ring of the electrode becomes rough or covered with pollutants after measurement, please clean it according to the following method: (For reference) Inorganic pollution: immerse the electrode in 0.1mol/L dilute hydrochloric acid for 15 minutes, gently wipe the platinum ring of the residual chlorine electrode with a cotton swab, and then wash it with tap water.
• Organic or oil pollution: immerse the electrode in tap water with a small amount of detergent, such as dishwashing liquid, and thoroughly clean the sensing surface of the electrode sensor. Gently wipe the platinum ring of the electrode with a cotton swab, then rinse with tap water, and the cleaning is complete. If the platinum ring of the electrode has formed an oxide film, please use toothpaste or 1000-grit fine sandpaper to properly polish the sensing surface, and then clean it with tap water. The platinum ring is connected to the glass, so please handle it carefully when polishing. The electrode has a service life of about one year, and a new electrode should be replaced in time after aging.
• Before the cable plug and the device plug are locked, do not put the plug part into water.

1.6 RS485 Commands

RS485 signal Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

1.7 Query data

Example 1: Read the current residual chlorine concentration of the device with address 01

Address	Function code	Register Address	Register length	CRC16 low	CRC16 high
0X01	0X03	0X00 0X00	0X00 0X01	0X84	0X0A

response:

Address	Function code	Valid Bytes	Register contents	CRC16 low	CRC16 high
0X01	0X03	0X02	0X03 0X16	0X39	0X7A

Calculation of residual chlorine concentration: 316H (hexadecimal) = 790 => residual chlorine = 7.90

Example 2: Set the deviation value for the current residual chlorine value of the device with address 01 to correct the value and send the frame: (If the current residual gas value output by the device is 7.90, the value needs to be corrected to 8.00, the difference is 8.00-7.90-0.100.1*100=10=>41200000 (floating point number), write 41200000 to the contents of the two registers)

Original address	Function code	Register address	Register number	Byte number	Register content	CRC16 low	CRC16 high
0X01	0X10	0X01 0X12	0X00 0X02	0X04	0X4120 0X0000	0X08	0X1A

response:

Address	Function code	Register address	Register number	CRC16 low	CRC16 high
0X01	0X10	0X01 0X12	0X00 0X02	0XE5	0X0D

2. Water Quality Sensor Datasheet

• Water Quality Sensor Transmitter Datasheet