Dissolved Oxygen Meter – D30
Industrial dissolved oxygen meter for wastewater and process water applications.
The D30 is an optical dissolved oxygen sensor using fluorescence technology to provide stable and accurate DO measurements without electrolyte or membrane replacement. With RS485 Modbus RTU output, it integrates easily into PLC, SCADA and VFD-controlled aeration systems in wastewater treatment plants.
Typical applications
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Wastewater treatment plants
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Aeration basins and biological reactors
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Sewage collection and treatment systems
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Industrial process water monitoring
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Aquaculture and water quality analysis
Description
Dissolved Oxygen Meter for Wastewater Treatment & Aeration Control
The D30 Dissolved Oxygen Meter is an industrial-grade optical DO sensor designed for continuous monitoring of oxygen levels in wastewater and process water applications. Using advanced fluorescence measurement technology, the D30 delivers accurate and stable dissolved oxygen readings without consuming oxygen and without the need for membranes or electrolytes.
Unlike traditional electrochemical sensors, the D30 operates independently of flow rate and agitation, making it highly reliable in aeration tanks, sewage systems, and treatment basins with fluctuating hydraulic conditions. Its maintenance-free design significantly reduces operating costs and downtime in long-term installations.
With RS485 Modbus RTU communication, the D30 integrates seamlessly into modern automation systems, including PLCs, SCADA platforms, and VFD-controlled aeration blowers and pumps. Accurate dissolved oxygen measurement is essential for optimizing aeration efficiency, reducing energy consumption, and maintaining stable biological treatment processes.
System integration note:
The D30 dissolved oxygen meter is commonly used as a feedback sensor for controlling VFD-driven blowers and aeration systems, enabling closed-loop oxygen control and energy-efficient operation.
Features
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Optical dissolved oxygen measurement using fluorescence method
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Maintenance-free design – no diaphragm or electrolyte replacement
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Does not consume oxygen and is unaffected by flow or agitation
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High stability and strong resistance to interference
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Stainless steel or POM body options for harsh environments
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RS485 Modbus RTU output for automation systems
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Extended service life with thickened fluorescent coating
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Suitable for continuous operation in wastewater applications
Specification
| Parameter | Specification |
|---|---|
| Measuring range | 0–20 mg/L |
| Measurement principle | Fluorescence (optical method) |
| Output signal | RS485 Modbus RTU |
| Measurement accuracy | ±1% F.S |
| Temperature measurement | 0–50 °C |
| Pressure range | 0–0.3 MPa |
| Temperature compensation | NTC automatic compensation |
| Body material | Stainless steel or POM (optional) |
| Waterproof rating | IP68 |
FAQ
What is a dissolved oxygen meter used for in wastewater treatment?
A dissolved oxygen (DO) meter is used to continuously measure oxygen concentration in wastewater and process water. In wastewater treatment plants, DO measurement is critical for controlling biological treatment processes and aeration systems. Accurate DO data helps optimize aeration efficiency, improve treatment performance, and reduce energy consumption, especially when used with VFD-controlled blowers.
What measurement principle does the D30 dissolved oxygen meter use?
The D30 uses an optical fluorescence measurement principle. Unlike traditional electrochemical sensors, it does not consume oxygen and does not require membranes or electrolytes. This results in higher stability, lower maintenance, and reliable measurements even in fluctuating process conditions.
Does the D30 dissolved oxygen sensor require regular maintenance?
No. The D30 is designed to be virtually maintenance-free. It does not require diaphragm replacement or electrolyte refilling. This makes it especially suitable for continuous operation in wastewater treatment plants where maintenance access may be limited.
Is the measurement affected by flow rate or agitation?
No. Because the D30 uses an optical fluorescence method, its measurement is independent of flow rate and agitation. This makes it ideal for aeration tanks, sewage systems, and basins with varying hydraulic conditions.
Can the D30 be used for closed-loop aeration control with VFDs?
Yes. The D30 provides RS485 Modbus RTU output, allowing direct integration with PLCs, SCADA systems, and controllers that regulate VFD-driven blowers. This enables closed-loop dissolved oxygen control for energy-efficient aeration systems.
