Introduction
An online dissolved oxygen controller is an instrument used for continuous, real-time measurement and control of the concentration of dissolved oxygen in a liquid, and it is used in wastewater treatment, aquaculture, environmental monitoring, and industrial processes, where the oxygen level is critical for biological and chemical processes. The controller consists of a dissolved oxygen sensor, which is installed in the process and measures the oxygen concentration using electrochemical or optical principles: electrochemical sensors use a membrane-covered electrode, in which oxygen diffuses through the membrane and is reduced at the cathode, generating a current proportional to the oxygen concentration, while optical sensors use a luminescent dye whose fluorescence is quenched by oxygen, providing a signal related to the oxygen level; and a transmitter or controller that displays the measured value, provides outputs and alarms, and can control aeration or other equipment to maintain the dissolved oxygen at the desired level. Online dissolved oxygen controllers are used in wastewater treatment plants for controlling aeration in biological treatment processes, ensuring that microorganisms have sufficient oxygen for the degradation of organic pollutants; in aquaculture and fish farming for monitoring and controlling the oxygen level in ponds and tanks to maintain the health of fish; in environmental monitoring of rivers, lakes, and reservoirs; in the food and beverage industry for process control; in biotechnology for fermentation monitoring; and in the power industry for monitoring dissolved oxygen in boiler feed water to prevent corrosion. Features include automatic temperature compensation, calibration, alarms, and communication interfaces. With their real-time monitoring and control capability, online dissolved oxygen controllers are essential for processes that depend on oxygen levels.
Online Dissolved Oxygen Controller LODC-T2010
Online Dissolved Oxygen Controller features 1 to 2 points dissolved oxygen calibration system, and 4 to 20 mA output signal transmitter. The large and clear back light displays Calibrati...
Standards
IEC 60746-1:2003-Expression of performance of electrochemical analyzers-Part 1: General
JJF 2294-2025-Calibration specification for on-line low-level dissolved oxygen meters
IEC 60746-4:2018-Expression of performance of electrochemical analyzers-Part 4: Dissolved oxygen in water
Complies with the above standards, but is not limited to them.
Features
1. Online dissolved oxygen controller for continuous monitoring of oxygen in water.
2. Real-time DO measurement with automatic control and alarm for aeration management.
3. Suitable for wastewater treatment, aquaculture, water treatment, food and industrial processes.
4. Includes DO sensor, controller, display, relays and operation manual.
5. Supports aeration control, water quality monitoring and process optimization.
FAQ
Q1: What testing scenarios is this controller mainly applied to?
A: The online dissolved oxygen controller is used in wastewater treatment plants, aquaculture facilities, water treatment, food and beverage production, pharmaceutical manufacturing, environmental monitoring and industrial processes to continuously monitor and control the dissolved oxygen concentration in water and process fluids. It supports wastewater treatment aeration basin control for biological treatment, aquaculture pond and tank oxygen management for fish and shrimp health, drinking water treatment DO monitoring, food and beverage process water quality, pharmaceutical water system monitoring, environmental water quality assessment, and industrial process oxygen control. The continuous measurement enables automatic aeration control, alarm notification and energy optimization. It is essential for wastewater treatment, aquaculture, water treatment, food and industrial facilities requiring continuous dissolved oxygen monitoring and control for biological process optimization, aquatic animal health, water quality management, energy efficiency and regulatory compliance, where dissolved oxygen is a critical parameter for aerobic biological treatment, aquatic life support, water quality and process performance in environmental, aquaculture and industrial water systems.
Q2: What standards does the controller comply with?
A: The online dissolved oxygen controller supports methods referenced in ISO 5814 for dissolved oxygen, ASTM D888, EPA methods, and relevant GB/T standards including GB/T 11913. The hardware complies with applicable industrial safety and electromagnetic compatibility standards. Calibration should use certified methods (air saturation or zero oxygen) traceable to standard procedures.
Q3: What is the warranty period for the whole machine and key components?
A: The whole controller including sensor is covered by a 12-month warranty. The electronics, display, relays and controller are covered, while DO sensors, membranes, electrolyte and cables are consumables or accessories. Damage from improper installation, fouling or unauthorized repair is excluded. Extended service contracts are available.
Q4: What is the typical lead-time for order delivery?
A: Standard models require 15-45 working days. In-stock units can ship within 7-15 working days. Custom sensor type or control configuration requires longer production time.
Q5: Is this device difficult to operate? Is professional training required?
A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.
Q6: Is regular calibration required? What is the recommended calibration cycle?
A: Calibration (air saturation or zero oxygen) recommended every 1-3 months depending on application and sensor fouling. Sensor membrane and electrolyte replacement per manufacturer schedule or when readings drift. Routine verification with a portable DO meter. Sensor cleaning per water quality conditions. Full system performance check annually.
Q7: Are supporting consumables universal?
A: DO sensors, membranes, electrolyte solutions and calibration accessories are available from multiple suppliers, though instrument compatibility should be verified. Long-term consumable and maintenance cost is moderate to high depending on water quality and sensor fouling, particularly in wastewater.
Q8: Can I customize parameters or supporting accessories?
A: Customization includes DO range, sensor type (electrochemical, optical), temperature compensation, control relays, communication protocol and enclosure rating. Additional sensors, cables and accessories can be ordered separately. Custom orders extend delivery lead-time.
Q9: Does the purchase include on-site installation and commissioning service?
A: Standard delivery includes the controller, sensor and accessories with an operation manual. On-site installation, calibration and training are not included for standard orders but can be arranged for wastewater or aquaculture setup. Remote guidance is provided.
Q10: What types of water are compatible with this equipment?
A: The online DO controller monitors dissolved oxygen in water and process fluids within the DO range, temperature rating and sensor compatibility. Highly fouling or corrosive water may require more frequent maintenance or special sensor protection. Very high or low temperature water may affect sensor performance. Users should select appropriate sensor type (electrochemical or optical) for the application, install the sensor in a well-mixed, representative location, calibrate regularly using proper methods, maintain sensor membranes and electrolyte, clean the sensor per water conditions, set appropriate aeration control setpoints, and ensure proper temperature compensation for accurate DO measurement. In wastewater applications, sensor fouling is common and regular cleaning is essential for reliable readings.
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