RS485 Modbus Automatic Cleaning UV254 Lake River Sewer Water Quality Treatment Monitor Cod Analyzer for Wastewater

• Customization: Available
• After-sales Service: Yes
• Warranty: 3 Years
• Model NO.: STW31
• Display: Digital
• Appliance: Wastewater Treatment
• Portable: Non Portable
• Certification: RoHS, CE
• Type: Cod Meter
• Function 1: Water Quality Monitor
• Funciton 2: Cod Wastewater Treatment
• Function 3: Wireless Cod Monitoring
• Function 4: Water Quality Sensor
• Transport Package: Carton Box
• Specification: 20*14*8
• Origin: China
• HS Code: 9032890000
• Production Capacity: 1000PCS/Month
• Package Size: 25.00cm * 25.00cm * 15.00cm
• Package Gross Weight: 3.000kg

Product Description

COD Sensor for Wastewater Treatment

      The COD Sensor is a digital sensor featuring an easy-to-integrate RS485 communication interface and standard Modbus protocol. It is equipped with a corrosion-resistant housing, IP68 protection rating, and a built-in self-cleaning brush for periodic cleaning of the measurement interface, making it suitable for harsh working environments. Utilizing long-life LED light sources and beam measurement technology, it ensures high measurement precision and stability.

Features

1. Features a corrosion-resistant titanium alloy housing

2. NPT 3/4 threaded interface for easy installation

3. It employs dual-beam measurement technology to simultaneously monitor parameters such as COD and turbidity

4. Operating without chemical reagents, it ensures rapid measurement, no secondary pollution

5. Equipped with a program-controlled self-cleaning function, it effectively prevents debris sedimentation and bubble adhesion on the measurement interface

6. It supports plug-and-play operation with built-in calibration record storage, eliminating the need for initial calibration upon first use

Operation principle

The fundamental measurement principle of the UV254 absorption method is based on the absorption of ultraviolet (UV) light by organic compounds in water samples to determine their content and composition.

Specifically, the UV absorption method involves directing UV light at a specific wavelength (254nm) into the water sample. The absorbance value obtained is then used to calculate the Chemical Oxygen Demand (COD) concentration in the water. This calculation relies on the Lambert-Beer Law, which serves as the foundational theoretical framework for measuring the absorbance of substances

Installation

1. Avoid exposing the sensor to direct sunlight

2. Do not touch the measurement area of the sensor with bare hands

3. Ensure the sensor surface is free of air bubbles during measurement and calibration

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

Technical Specification

(Custom configurations available upon request.)

Model	STW31	Voltage	DC12V-DC24V
Measurement range	≤500mg/L,≤500NTU	Communication mode	RS485(Modbus RTU)
Measurement accurate	≤±5%	Protection rating	IP68
Measurement principle	UV254	Resolution	0.01mg/L
Repeatability	Below 3%	Extension cable	5m
Drift	Below 3%
Optical Path Length	20mm

Company Profile

Who we are

ShenZhen StarWSN is a professional liquid level and water quality monitoring device company which established in 2016. We focusing on the application of smart sensing technology in drainage network and river level monitoring. The main product include wireless water level detector,wireless pressure sensor,river flow monitoring station and online water quality analyzer etc. The products are widely used in smart city, environmental protection, municipal, chemical, power, sewage treatment, 
emergency rescue and other fields.   
                                                           
The company fully implements the ISO9001 quality management system,passed over 20 types of reliability tests and certifications. With leading research and development capabilities for software and hardware. Committed to providing high-quality products and "one-stop" services to all the customers.

Packaging & Shipping

FAQ

Q: What's the lead time for orders?
A: Standard models ship in 15–30 days; customized units require 30–45 days.

Q: Do you provide after-sales service overseas?
A: Yes, we have partnered service centers in key regions.

Q: Can I request a customized order?
A: Absolutely! We offer OEM and ODM service.

Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).

Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.