China Probest PFDO-700 Online Dissolved Oxygen Sensor | Industrial DO Monitor for Water Quality Analysis
Fluorescence Method RS485 Dissolved Oxygen Probe Manufacturer for Aquaculture, Sewage Treatment & Environmental Monitoring
The probes are waterproof and can be submerged completely, which makes them ideally suited for e. g. environmental research applications, aquaculture, and measurement in sewage.
PFDO-700 Dissolved Oxygen Online Sensor
Probest, a professional ISO9001-certified water analysis instrument manufacturer in China, presents the PFDO-700 online dissolved oxygen sensor – a high-precision, low-maintenance solution for real-time DO monitoring in water samples (mg/L). Adopting advanced fluorescence measurement technology, this waterproof DO probe is fully submersible, making it ideal for environmental research, aquaculture, sewage treatment, and industrial process water monitoring.
Measurement Principle
The PFDO-700 dissolved oxygen sensor uses fluorescence method to measure dissolved oxygen concentration accurately:
The sensor cap is coated with a luminescent material, which is excited by blue light from an internal LED.
The excited luminescent material releases red light, and the time/intensity of the red light is inversely proportional to the oxygen molecule concentration.
The sensor calculates the exact dissolved oxygen level based on this optical principle, with no oxygen consumption during measurement, no requirement for flow rate or stirring, ensuring high repeatability and long-term stability.
n Features
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No Oxygen Consumption & No Flow Requirement: The fluorescence technology eliminates oxygen consumption during measurement, with no need for stirring or continuous flow, delivering reliable data in static water environments.
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Nearly Maintenance-Free: Breakthrough membrane-free, electrolyte-free design, with minimal upkeep and low long-term operation cost.
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Factory Calibrated & Long Calibration Interval: Pre-calibrated at the factory, supporting 1-year calibration-free use, with optional on-site calibration for flexible deployment.
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High Anti-Interference & Long-Distance Transmission: Digital RS485 MODBUS communication ensures strong anti-jamming capability, stable long-distance signal transmission (up to 100m cable), and easy integration with existing systems.
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Plug-and-Play & Self-Diagnosis: Built-in self-diagnosis function guarantees data accuracy, with plug-and-play design for quick and easy installation.
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Corrosion-Resistant & IP68 Waterproof: SUS316L (fresh water) / titanium alloy (seawater) body, IP68/NEMA6P protection, suitable for fresh water, seawater, and harsh industrial environments.
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NTC Temperature Compensation: Equipped with NTC temperature compensation, ensuring consistent measurement accuracy across 0-45℃ operating temperature range.
n Applications
The PFDO-700 online dissolved oxygen sensor is widely used in:
Sewage & Wastewater Treatment: DO online monitoring for regulating reservoirs, biochemical tanks, and effluent discharge
Aquaculture: Real-time dissolved oxygen monitoring for fish/shrimp ponds, ensuring optimal breeding environment
Water Plants & Surface Water Monitoring: DO detection for drinking water, rivers, lakes, and environmental research
Industrial Process Water: DO monitoring for industrial production processes, chemical, and pharmaceutical industries
Marine & Offshore Applications: Titanium alloy version for seawater and marine environmental monitoring
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Why Choose Us:
Probest is a leading China-based water quality sensor manufacturer with ISO9001 certification, specializing in R&D, production, and sales of water analysis instruments, including dissolved oxygen sensors, pH sensors, ORP sensors, EC sensors, turbidity sensors, MLSS/sludge concentration sensors, portable water analyzers, and multi-parameter water quality monitoring systems.
Our Core Advantages:
Strong R&D Capability: 50+ R&D engineers, with ≥10% of annual turnover invested in R&D, holding multiple patents for sensor technology.
Strict Quality Control: 20+ QA & 18+ QC teams, full RoHS/CE certification, 100% full inspection before shipment, ensuring stable and reliable performance.
Large-Scale Production Base: 10,000+ square meter factory, supporting mass production and fast delivery.
Low Maintenance & Long Service Life: Advanced fluorescence technology ensures long service life and minimal maintenance cost.
Customization & Global Partnership: We offer OEM/ODM services, and are actively looking for global distributors and strategic partners to join our network.
Our Commitment:
We focus on developing innovative sensor technology to make water analysis faster, simpler, greener, and better. Our products are widely applied in drinking water, wastewater, surface water, aquaculture water, and industrial process water monitoring, serving customers worldwide.
Product Description
Measurement range | 0-20 mg/L or 0-200% saturation;Temperature:0-45℃ |
Measurement Accuracy | ±3% or ±0.3 mg/L, whichever is greater ; Temperature:±0.5℃ |
Resolution | 0.01mg/L |
Repeatability | ±0.3mg/L |
Pressure range | ≤0.3Mpa |
Calibration | Air automated calibration,sample calibration |
Main material | Body:SUS316L(fresh water),Titanium alloy(Ocean marine);Cover:PPS+ glass fiber;Cable:PUR |
Communication protocol | MODBUS RS485 |
Storage temperature | -15-60℃ |
Measuring temperature | 0-45℃(Non-freezing) |
Dimensions | Dia49.5mm*L 251.3mm |
Weight | 1.4KG |
Protective rate | IP68/NEMA6P |
Cable length | Standard:10m, the maximum may be extended to 100m |
Warmly welcome online or on-site meetings to visit our factory and learn more about our products.
Looking for OEM/ODM cooperation, or want to become a PROBEST global distributor? Contact us today to build a long-term strategic partnership!
Any feedback from you is highly appreciated.
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Q1: What is the difference between PFDO-700 and traditional electrochemical DO sensors?
A: Unlike traditional electrochemical sensors, the PFDO-700 uses fluorescence technology, with no oxygen consumption, no membrane/electrolyte replacement, no flow requirement, and nearly zero maintenance, making it more suitable for long-term online monitoring.
Q2: Can the sensor be used in seawater?
A: Yes, we offer a titanium alloy version of the PFDO-700, which is corrosion-resistant and specially designed for seawater and marine applications.
Q3: What is the communication protocol of the sensor?
A: The sensor supports standard MODBUS RS485 protocol, which can be easily integrated with PLC, DCS, and other industrial control systems without an additional controller.
Q4: How long is the calibration interval?
A: The sensor is factory-calibrated, supporting 1-year calibration-free use, and can be calibrated on-site at any time as needed.
