Dissolved oxygen(DO) is crucial for water quality, aquaculture, wastewater treatment, industrial output, and research. It impacts process stability, environmental safety, and product quality. Online dissolved oxygen controllers, electrodes, accessories, laboratory meters, and portable meters are available in Sino-Inst. Continuous monitoring at industrial sites, reliable lab analysis, and outdoor mobile detection are all possible with these. All items are reliable, stable, and simple. They provide fast, precise dissolved oxygen data to many sectors.
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Dissolved Oxygen Controller
What is dissolved oxygen(DO)?
Dissolved oxygen (DO) is the oxygen (O ₂) that is dissolved in the gaps between water molecules. It is a very important component for aquatic life and for aerobic microbes to break down organic matter. The most common ways to say it are in concentration mg/L or saturation%.
Why is it necessary to monitor dissolved oxygen(DO)?
- Environmental health indicators: directly reflect the self purification capacity and ecological status of water bodies. Low DO often means pollution.
- Key industrial processes: affecting wastewater treatment efficiency (such as activated sludge process), boiler system corrosion, fermentation process control.
- The lifeline of aquaculture: ensuring the survival and health of fish, and avoiding large-scale mortality due to hypoxia.
- Compliance requirements: Numerous environmental emission standards have clear limits on effluent dissolved oxygen (DO).
5 factors affecting dissolved oxygen levels
- Temperature: The greater the water temperature, the lower the dissolved oxygen saturation value. You can also provide a short comparison chart.
- Water movement: DO (dissolved oxygen) levels go up when water is turbulent or aerated, but they go down when water is quiet.
- Salinity: When salinity goes up, dissolved oxygen goes down.
- Biological and chemical processes: Algae photosynthesis (adding oxygen) vs. respiration and breaking down organic materials (taking away oxygen).
- As altitude rises and pressure falls, dissolved oxygen levels fall.
Core product series details
Online dissolved oxygen controller
core positioning
The “central brain” of 24-hour uninterrupted monitoring in industrial sites is suitable for continuous operation scenarios such as sewage treatment, chemical fermentation, aquaculture, and drinking water treatment, supporting data transmission, alarm control, and automation linkage.
Core functions and advantages
- High-precision measurement: accuracy of ± 0.1mg/L and automated temperature adaptation from 0 to 60 °C.
- Intelligent control: Chinese and English LCD display, dual unit switching of mg/L/% saturation.
- Linkage control: high/low limit alarm, 1-3 sets of relays linked to aeration and dosing equipment.
- Data traceability: ≥ 10000 data storage, RS485 Modbus RTU communication.
- Stable and durable: IP65 protection, wide voltage supply, resistant to industrial site interference.
Typical Applications
- Real time monitoring of dissolved oxygen in the aeration tank and secondary sedimentation tank of the sewage treatment plant is linked with the aeration system.
- Control of dissolved oxygen concentration during fermentation processes in the chemical and pharmaceutical industries to ensure reaction efficiency.
- Continuous dissolved oxygen monitoring in aquaculture ponds and seedling workshops to prevent hypoxia in fish and shrimp.
Online dissolved oxygen electrode
core positioning
The supporting sensing components of the online dissolved oxygen controller are responsible for directly contacting the measured medium and converting the dissolved oxygen content into electrical signals, which is a key guarantee for measurement accuracy.
Core types and advantages
| Electrode Type | Core Features | Suitable Scenarios |
|---|---|---|
| Fluorescent Dissolved Oxygen Electrode | No polarization required; fast response time (≤3 seconds); no membrane wear, long maintenance cycle (6~12 months); strong anti-pollution and anti-interference capabilities | Sewage treatment, industrial fermentation, high-pollution water quality |
| Polarographic Dissolved Oxygen Electrode | Stable measurement, high cost-performance; replaceable membrane, suitable for conventional water quality | Drinking water treatment, aquaculture, medium and low-pollution water quality |
Benefits in general
- 316L stainless steel/PFA shell is strong and won’t corrode when exposed to acid or alkali.
- Built-in NTC/PT1000 for temperature adaption and automated temperature compensation.
- Installation is easy: it may be installed in immersion, flange, or pipeline mode, and the threads are standard.
Online dissolved oxygen accessories
core positioning
Equipped with an online monitoring system, it solves problems such as installation fixation, signal transmission, and maintenance convenience, extends equipment service life, and improves monitoring reliability.
Laboratory dissolved oxygen analyzer
core positioning
Great for academic research, quality control labs, and corporate labs that need to undertake precise analysis. It is all about precisely detecting and recording how much dissolved oxygen is in samples.
Core functions and advantages
- Ultra high precision: ± 0.01mg/L accuracy, 0.001mg/L resolution, supports micro measurement.
- Multi measurement mode: single point/multi-point calibration, balanced/continuous measurement dual mode.
- Data management: 50-200 sets of storage, supporting viewing, deletion, and USB export.
- Easy to operate: large screen backlit display, automatic shutdown and power-off protection.
- Wide adaptability: compatible with fluorescence/polarographic electrodes, suitable for various types of samples.
Typical Applications
- Dissolved oxygen detection and data reporting of water quality samples at environmental monitoring stations.
- Analysis of dissolved oxygen in scientific research and experimental teaching in universities.
- Quality inspection of products in the food, beverage, and pharmaceutical industries.College research training: Mobile water quality analysis for field research investigation and outdoor experimental teaching.
Portable dissolved oxygen analyzer
core positioning
Specially designed for outdoor and on-site mobile detection, no fixed installation required, suitable for outdoor scientific research, emergency monitoring, on-site inspection and other scenarios, balancing portability and accuracy.
Core functions and advantages
- Ultimate portability: ≤ 0.5kg weight, handheld design, equipped with protective case.
- Long battery life: The lithium battery has a lot of power and may last 8 to 12 hours on a single charge. It can also charge other devices.
- Quick measurement: just plug it in and play; no need to warm it up first; readings are stable in less than three seconds.
- Environmental adaptation: IP67 protection, -5~60 ℃ automatic temperature compensation.
- Easy to operate: One click power on/calibration, ≥ 100 sets of data storage, adjustable backlight.
Typical Applications
- Environmental emergency: Field dissolved oxygen testing of rivers, lakes, and groundwater.
- Aquaculture: on-site dissolved oxygen inspection of ponds and seedling sheds.
- Industrial inspection: dissolved oxygen detection of circulating water and cooling water in the chemical and power industries.
Advantages of a full scenario solution
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Monitoring dissolved oxygen needs “accuracy, stability, and the ability to adapt to different situations.” Our full range of equipment can satisfy the needs of mobile detection, fixed monitoring, industrial sites, and laboratories. There are special ways to monitor dissolved oxygen that are only available for controlling the wastewater treatment process, analyzing scientific research experiments, and providing real-time support for aquaculture. Dissolved oxygen monitoring is easier and less stressful with our high-quality devices, helpful selection advice, installation and commissioning, and after-sales assistance. You can reach us at any moment for help with product settings or technical issues!
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