Hangzhou Qiwei Instrument Co., Ltd. is one of the leading manufacturers and suppliers of Industrial Online DO Controller in China. With a professional production team, we are able to meet the needs of the majority of our customers. Welcome to wholesale bulk Industrial Online DO Controller in stock here from our factory. We also accept customized orders.
The QW-Lab Industrial Online Dissolved Oxygen Meter is designed for continuous dissolved oxygen monitoring in industrial water treatment, wastewater treatment plants, aquaculture systems, and environmental monitoring applications.
With robust industrial installation design, multiple signal output options, and reliable online measurement capability, this DO analyzer provides real-time oxygen monitoring for process control and water quality management.
The instrument supports wall-mounted and panel-mounted installation configurations and can be easily integrated into PLC, SCADA, and industrial automation systems through RS485 communication and 4-20mA analog signal output.
Main applications:
• Wastewater treatment aeration process monitoring
• Aquaculture dissolved oxygen control
• Industrial water quality monitoring
• Environmental water analysis
• Food and beverage process water monitoring
• Chemical and industrial process control
product key technologies
The industrial online DO meter is an intelligent online continuous real-time monitoring instrument, and the sensor adopts polarographic film-covered dissolved oxygen electrode. The instrument is widely used in power plants, petrochemical industry, metallurgy electronics, mining industry, paper industry, biological fermentation, medicine, food and beverage, environmental protection water treatment, breeding and other industries.
RS485 and 4-20mA Signal Integration Guide
The industrial online dissolved oxygen meter provides multiple communication interfaces for seamless integration with industrial control systems.
RS485 RTU Communication
RS485 interface allows digital communication between the DO analyzer and external control systems.
Connection structure:
DO Meter RS485 A/B
PLC / SCADA / Data Acquisition System
Supported applications:
• Remote monitoring
• Centralized data management
• Industrial automation control
• Water treatment process optimization
Benefits:
✓ Stable long-distance communication
✓ Reduced signal interference
✓ Easy integration with existing systems
4-20mA Analog Signal Output
The 4-20mA output provides reliable analog transmission for industrial automation.
Typical connection:
DO Meter
4-20mA Input Module
PLC Controller
Control System
Applications:
• Aeration control
• Pump control
• Oxygen level alarm system
• Process monitoring
Advantages:
✓ Compatible with industrial PLC systems
✓ Suitable for long-distance transmission
✓ Reliable in industrial environments
Technical parameters
|
Measurement range |
0~20.00 mg/L |
|
Resolution |
0.01 mg/L |
|
Error |
±0.3 mg/L |
|
Power Supply |
220V±10% 50Hz |
|
Power Consumption |
≤ 3 W |
|
Ambient Conditions |
(1) Temperature 0 ~ 60 °C (2) Humidity ≤ 85% RH |
|
Size |
96×96×110mm |
|
Opening Size |
92×92mm |
The main menu interface shows
Settings Menu:
1. Unit setup
2. Parameter settings
3. Instrument calibration
4. Control parameters
5. Transmission parameters
6. Communication Settings
7. Factory Settings
Instrument calibration
This instrument adopts two-point calibration. Select instrument calibration in the setting menu, enter with "OK" key, zero calibration first and then saturation calibration. Please prepare a cup of anaerobic water and a cup of saturated dissolved oxygen water first (for the method of preparing anaerobic water and saturated dissolved oxygen water, see Annex 1 for details).
Zero calibration (zero calibration for anaerobic water):
Clean the electrode in clean distilled water (tap water can be replaced), put it in anaerobic water , stir with the electrode, and press the "OK" key for zero calibration when the value shows stability.
Preparation of anaerobic water:
Take a pack of reagent A, add 30ML distilled water or tap water, cover and shake well. (The lid is tightly closed and can be stored in the dark for a month)
Saturated dissolved oxygen calibration:
Clean the electrode in clean distilled water (tap water can be replaced), press the switch key to select the saturation calibration option, put in saturated dissolved oxygen water, stir with the electrode, and press the "OK" key for saturation calibration when the value shows stability.
Preparation of saturated dissolved oxygen water:
Take about 500 ML of tap water, aerate it with an oxygen pump for 5 minutes, then start the calibration.
Real Application Scenarios
Wastewater Treatment Plant
Dissolved oxygen measurement plays an important role in biological treatment processes.
The online DO meter helps operators:
• Monitor aeration efficiency • Optimize oxygen supply • Reduce energy consumption • Maintain treatment stability
Aquaculture Oxygen Monitoring
Maintaining suitable dissolved oxygen levels is essential for aquatic growth.
The system provides:
• Continuous oxygen monitoring • Early warning of oxygen shortage • Improved farming management
Industrial Process Monitoring
Used for:
• Water quality control • Process optimization • Automated monitoring systems
Products Description
1.What is the purpose of an industrial online dissolved oxygen meter?
It is utilized for ongoing dissolved oxygen monitoring in industrial water processes, aquaculture, wastewater treatment, and environmental monitoring.
2.Can PLC systems be connected to the DO meter?
Indeed. The device may be integrated with PLC and SCADA systems thanks to its 4-20mA output and RS485 connectivity.
3.Which installation techniques are accepted?
Depending on the needs of the application, the industrial DO meter can be installed either panel-mounted or wall-mounted.
4.Is remote monitoring supported by the DO analyzer?
Indeed. The meter can be connected to industrial monitoring systems for centralized data management via RS485 connection.
5.Can the sensor be submerged in water for an extended period of time?
The sensor can be utilized in wastewater and aquaculture settings and is intended for continuous water measurement applications.
Hot Tags: Industrial Online DO Controller, China Industrial Online DO Controller manufacturers, suppliers, factory, Benchtop Dissolved Oxygen Meter, Benchtop DO Meter, Pen DO Meter
