Dissolved Oxygen Meter
The Veswe Dissolved Oxygen Meter (VRS-LDO-N01-2-20-EX) utilizes the advanced fluorescence measurement principle for accurate DO concentration monitoring in water. This oxygen consumption-free technology eliminates the need for electrolytes, ensuring zero drift and minimal maintenance.
With a wide measurement range of 0~20 mg/L, it delivers precise readings for various aquatic environments. Equipped with a built-in temperature transmitter and automatic temperature compensation, this robust meter guarantees reliable performance in fluctuating temperatures, making it ideal for aquaculture, environmental monitoring, and wastewater treatment.
- Model: VRS-LDO&-N01-2-20-EX
- MOQ: 1 PCS
- Delivery date: within 24 hours
- Inquire About Price Now
Inquiries: Email: contact@veswe.com | WhatsApp: +8613418148929
The Breath of Life – An Intelligent Dissolved Oxygen Meter That Never Sleeps
Imagine standing by a tranquil pond or a bustling wastewater tank, knowing exactly how much life-sustaining oxygen is hidden beneath the surface. This isn’t just a piece of hardware; it’s an advanced Dissolved Oxygen Meter designed to be the lungs of your operation. Unlike old-school electrodes that consume the very oxygen they measure, this unit uses advanced fluorescence technology to “listen” to the water without disturbing it. No electrolytes to refill, no membranes to foul—just pure, uninterrupted insight. Visualize the sleek black probe resting on marble, flanked by green leaves; it symbolizes a harmony between high-tech precision and nature. Whether you are protecting delicate aquatic life or optimizing industrial aeration, this online dissolved oxygen sensor integrated into our Dissolved Oxygen Meter offers a maintenance-free promise, ensuring you never miss a beat in the rhythm of your water.
The Science of Silence – Fluorescence Quenching Principle
True accuracy doesn’t need to be loud. At the heart of this Dissolved Oxygen Meter lies the elegant principle of fluorescence quenching. Imagine a tiny burst of blue light exciting a fluorescent material, which then glows red. Oxygen molecules in the water gently “hush” this glow—the more oxygen present, the quieter the light. By measuring this subtle change in phase and intensity, our dissolved oxygen measurement system calculates the exact O₂ concentration without consuming a single molecule of oxygen. This is a revolution compared to traditional oxygen probes that deplete local levels in stagnant water. With built-in temperature compensation, this optical O2 sensor delivers data that is as scientifically robust as it is environmentally respectful, making our Dissolved Oxygen Meter perfect for applications where every milligram counts.
Precision in Every Drop – High Accuracy & Wide Range
From the deepest hypoxic zones to the frothy peaks of supersaturated aeration tanks, life exists on a spectrum. Our Dissolved Oxygen Meter is engineered to capture it all, with a range of 0 ~ 20 mg/L and a resolution as fine as 0.01 mg/L. Picture a digital cityscape where data streams flow like rivers; this DO sensor plugs you directly into that stream of real-time analytics. Whether you are monitoring a barely breathing wetland or a hyper-active bioreactor, this dissolved O2 sensor provides the granularity you need to make critical decisions. It’s not just about reading numbers; it’s about understanding the story of your water’s health with unparalleled clarity, all displayed clearly on your Dissolved Oxygen Meter.
Simplicity is the Ultimate Sophistication – Two-Step Calibration
After a decade in sales, I’ve learned that the best technology is the kind you don’t have to think about. We’ve stripped away the complexity. Calibrating this Dissolved Oxygen Meter is as easy as breathing. Step one: Expose it to air for a “Full-Scale” check. Step two: Dip it in a zero-oxygen solution for a “Zero” reset. That’s it. No complex chemicals, no lab-grade expertise required. This user-friendly approach ensures that your oxygen dissolved sensor remains accurate even in the hands of non-experts. It’s designed for the field, for the busy engineer who needs reliability without the headache, turning a tedious chore into a two-minute ritual of confidence with your new Dissolved Oxygen Meter.
A Steady Heart in a Changing World – Intelligent Temperature Compensation
Water temperatures fluctuate with the seasons, the time of day, and the industrial process, but your data shouldn’t. This Dissolved Oxygen Meter houses a built-in temperature transmitter that acts as a silent guardian, automatically correcting readings from 0°C to 40°C. Imagine a graph where other sensors drift wildly with thermal changes, while this unit holds a steady, unwavering line. This intelligent compensation ensures that your dissolved oxygen sensors deliver consistent truth, whether deployed in a chilly mountain stream or a warm treatment lagoon. It’s the stability you need to sleep soundly, knowing your Dissolved Oxygen Meter is immune to the elements.
Built for the Real World – Rugged & Ready
Nature and industry are harsh mistresses. That’s why the probe of this Dissolved Oxygen Meter is encased in an IP68-rated armor, completely impervious to water and dust. The fluorescent membrane is designed for longevity, lasting up to a year under normal conditions, reducing your total cost of ownership significantly. Notice how it stands alone? No need for a bulky external meter; this Dissolved Oxygen Meter is a standalone powerhouse. Easy to install, fast to respond, and incredibly stable, it’s the rugged partner you can trust to withstand splashing waves, corrosive effluents, and the test of time.
Taking Control – Dual Passive Relays for Automated Safety
Monitoring is good; controlling is better. This Dissolved Oxygen Meter isn’t just watching; it’s ready to act. Equipped with two passive relays, it allows you to set your own rules. If oxygen drops too low, it triggers your aerator. If it gets too high, it shuts down to save energy. Visualize the controller display showing real-time DO, temperature, and current output—it’s your command center. With simple menu options for alarms and thresholds, you can link this optical dissolved oxygen sensor directly to pumps and valves without needing a complex PLC. It’s automation made simple, putting the power of response right at your fingertips with your Dissolved Oxygen Meter.
The Circle of Life – Automated Two-Step Control
Imagine a system that cares for your water as much as you do. Our closed-loop control creates a perfect feedback cycle. When the dissolved oxygen measurement from your Dissolved Oxygen Meter falls below your set limit, the system wakes up, activating oxygen generation equipment via AC contactors. Once the optimal level is reached, it gently puts the system back to sleep. This intelligent dance ensures that your aquaculture ponds or bioreactors always stay in the “Goldilocks zone”—not too little, not too much. It’s energy efficiency and biological safety working in harmony, driven by the smart logic of our DO probe and controller.
Freedom from Distance – The Free Cloud Platform
Why be tied to the site when your data can travel? Connect your Dissolved Oxygen Meter to our proprietary cloud platform and unlock the world. Monitor your remote fish farms or scattered wastewater stations from your phone, tablet, or laptop. Receive instant multi-level alarms if something goes wrong, analyze historical trends to predict issues, and export reports with a click. This transforms a simple dissolved oxygen detector into a node of a global intelligence network. It’s about giving you the freedom to be everywhere at once, ensuring that distance never compromises the quality of your care.
One View, Many Sites – On-Site Centralized Display
Managing a large-scale operation shouldn’t feel like herding cats. Our architecture allows multiple field monitoring points to transmit wirelessly to a central information center. Whether you are overseeing four ponds or forty, view synchronized dashboards on desktops or mobiles with geographic mapping. This network of Dissolved Oxygen Meter units provides a holistic view of your entire operation, from municipal wastewater networks to vast river basins. It’s the clarity of command you need to manage complexity, turning scattered data points into a cohesive story of environmental health.
Speaking the Language of Industry – Standard ModBus-RTU
In a world of proprietary lock-ins, we believe in openness. This Dissolved Oxygen Meter speaks the universal language of ModBus-RTU via RS485. Whether you are integrating with KingView, Kunluntongtai, or Sunway systems, the connection is seamless. Configure the slave address and baud rate with ease, and plug it directly into your SCADA or PLC. It’s the do probe system that plays nice with everyone, designed for system integrators who value flexibility and speed. No custom coding, no headaches—just plug, play, and monitor with your Dissolved Oxygen Meter.
A Guardian Everywhere – Versatile Application Scenarios
From the engineered precision of a wastewater clarifier to the wild beauty of a coastal bay, this Dissolved Oxygen Meter is at home everywhere. In Water Treatment, it optimizes biological processes, ensuring effluent safety. In Aquaculture, it’s the lifeline for fish and shrimp, guaranteeing optimal growth conditions. In Environmental Monitoring, it stands watch over our rivers and oceans, tracking ecosystem health. Wherever water flows and life depends on oxygen, this dissolved oxygen probe system is ready to serve. It’s more than a tool; it’s a commitment to a healthier, more sustainable future for us all.
About - Dissolved Oxygen Meter
Our dissolved oxygen sensors are divided into two types: seawater and freshwater. The calibration function provides a simpler and more convenient way to calibrate. Water dissolved oxygen meter can be widely used in water treatment, aquaculture, rivers, lakes, and seawater quality monitoring industries.
- Dissolved oxygen measurement range is 0~20mg/L (0~200% saturation).
- The Modbus communication address can be set, and the baud rate can be modified.
- The dissolved oxygen sensor uses a wide voltage power supply, DC 10~30V can be.
- Uses imported high-quality fluorescent membrane.
- The principle of fluorescence measurement is adopted, no oxygen is consumed, and no electrolyte is required.
- Free cloud platform for the data view.
Datasheets
| Power supply | DC 10~30V |
|---|---|
| Signal output | RS485 |
| Power consumption | 0.2W |
| Working principle | Fluorescence Method |
| Measure range | 0~20mg/L (0~200% saturation) |
| Measure error | ±3%FS; ±0.5℃ (25℃) |
| Resolution | 0.01mg/L; 0.1%; 0.1℃ |
| Response time | ≤60s |
| Operating conditions | 0~40℃ |
| Fluorescent film lifespan | 1 year under normal use |
| Protect class | IP68 |
| Pressure resistance | 0.6MPa |
| Electrode wire length | Default 5m |
| Shell material | Standard type: Corrosion-resistant plastic, stainless steel; Economy type: Corrosion-resistant plastic |
Working principle
Fluorescence Dissolved Oxygen: Based on the quenching principle of active fluorescence by specific substances in physics.
By measuring the phase difference between the excited red light and the reference light, and comparing it with the internal calibration value, the concentration of oxygen molecules can be calculated.
Compared to polarography, fluorescence measurement does not require the consumption of oxygen in water, and it has a faster response time, stronger anti-interference ability, and more accurate measurement results.
Calibration
1. Zero oxygen standard solution preparation
In a place without wind and direct sunlight, take purified water (distilled water or deionized water) deep enough to cover the stainless steel part of the electrode. For every 95 g of water, add 5 g of anhydrous sodium sulfite. Stir thoroughly until fully dissolved to obtain a 5% sodium sulfite solution. Let it stand for 1 hour to ensure that the oxygen in the solution is completely consumed. If conditions allow, a trace amount of cobalt chloride can be added as a catalyst.
2. 100% oxygen environment preparation
In a place without wind and direct sunlight, take purified water (distilled water or deionized water) deep enough to cover the stainless steel part of the electrode. Use an air pump to continuously aerate the water for 1 hour, then let it stand for 30 minutes to obtain air saturated water.
Alternatively, use a sealed container, take a small amount of water, and shake it vigorously for 30 seconds to obtain air saturated with water vapor. During calibration, keep the fluorescent membrane about 1 cm above the water surface, ensuring the membrane is moist but without water droplets.
3. In the configuration tool, find the Dissolved Oxygen option under the Water Quality Sensor tab.
4. Place the dissolved oxygen sensor in the 100% oxygen environment. After the dissolved oxygen reading stabilizes, click the Full Scale Calibration button to complete the 100% oxygen saturation calibration.
5. Then place the sensor into the zero oxygen standard solution. Gently stir to speed up the response, then let it stand. After the dissolved oxygen reading stabilizes, click the Zero Calibration button to complete the zero oxygen calibration.
Note:
In each calibration environment, the device should be left stationary for a sufficient amount of time to ensure that the device temperature is the same as the ambient temperature.
FAQs - Dissolved Oxygen Meter
A negative value is normal. During calibration, the value recorded corresponds to the fluorescence lifetime at 0 percent oxygen. In actual measurement, this value can fluctuate, and long term use may also introduce drift.
In practice, it is possible to apply a limit and force all values below zero to be displayed as zero. However, if this is done, users with their own calibration requirements would not be able to judge whether the 0 percent oxygen value is truly stable during calibration.
Avoid using it in organic solvents, and do not clean the membrane cap with organic solvents. The fluorescent membrane uses an embedding method to fix the fluorescent material within the film. Organic solvents can cause the fluorescent material to leach out.
Our product actually measures dissolved oxygen saturation in percent. The dissolved oxygen concentration is calculated from this value using salinity, atmospheric pressure, temperature, and other constants. Changes in salinity and atmospheric pressure affect the dissolved oxygen concentration at the same saturation level. The general trends are: higher salinity results in lower dissolved oxygen concentration, and higher atmospheric pressure results in higher dissolved oxygen concentration.
The sensor should be fixed and installed below the liquid surface. During installation and use, avoid impact or scratching of the fluorescence membrane head, and prevent the membrane head from being covered by bottom sediments. Remove the rubber protective cap before use. The dissolved oxygen electrode is equipped with an NPT 3/4 thread and can be used with our waterproof pipe. Feed the cable through the pipe, then screw the sensor into the threaded port of the waterproof pipe.
For the outer surface of the electrode: Rinse with tap water and gently wipe with a soft, damp cloth. For stubborn contamination, a small amount of household detergent may be added to tap water for cleaning.
For the outer surface of the optical (fluorescent) cap: Rinse the sensor’s optical window with clean water to remove surface contaminants. If wiping is necessary, use a soft cloth and wipe gently. Do not scrape or apply excessive force, as this may damage the fluorescent membrane and result in inaccurate measurements.
If dust or moisture has entered inside the optical (fluorescent) cap. Unscrew the optical cap and rinse the inner surface of the cap and the instrument’s optical glass window with tap water. If oily contaminants are present, clean with tap water mixed with a small amount of household detergent. After cleaning, thoroughly rinse off any detergent residue, then dry all cleaned surfaces with a lint-free soft cloth. Finally, place the components in a dry environment and allow any remaining moisture to fully evaporate.
Under normal conditions, humid air is considered to represent 100% dissolved oxygen saturation. The dissolved oxygen concentration varies with temperature: as temperature increases, the dissolved oxygen concentration at saturation decreases. This is because higher temperatures intensify molecular motion, making oxygen molecules more likely to escape from the water.
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Contact us
Our colleague: Jack
Phone/ Whatsapp: +86 13418148929
Email: contact@veswe.com
Address:Floors 1–4, No. 269 Nanda Highway, Dashi Street ,Panyu , Guangzhou, Guangdongdong, China
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