Water and purpose
Identify wastewater aeration, surface water, industrial water, aquaculture or drainage-network monitoring.
DO · Optical online measurement
Select a PFDO dissolved-oxygen analyzer by pressure, probe size and application
PFDO-800, PFDO-700, PFDO-600 and PFDO-500 are structured from the supplied model sheets. They share the core range but differ in pressure rating, sensor size, weight, construction options and application focus.
4model-specific detail pages
0–20 mg/Lverified DO range
0.01 mg/Lresolution
6real project records
01 · Start with the process
Do not select only from the shared 0–20 mg/L range
The key differences are pressure, probe dimensions, freshwater or seawater construction, immersion arrangement, cable and maintenance conditions—not the headline range.
Pressure and space
PFDO-800/700 are rated ≤0.3 MPa; PFDO-600 ≤0.2 MPa; PFDO-500 ≤0.1 MPa.
Probe size and material
Compare Ø49.5, Ø30 and Ø25 mm probes and confirm standard SUS316L or the documented titanium-alloy seawater option.
System interface
Confirm 10–100 m cable, power, three 4–20 mA outputs, relays and Modbus RS485.
02 · Model architecture
Four PFDO models, presented separately
Each page retains its own pressure, construction, dimensions, weight and application evidence instead of mixing specifications.
Optical online analyzerPFDO-800Fluorescence Dissolved Oxygen Online Analyzer
The full-size optical configuration for continuous freshwater or seawater projects, with a 49.5 × 251.5 mm sensor and the highest documented pressure rating in this four-model series.
0–20 mg/L≤0.3 MPa49.5 × 251.5 mm
Optical online analyzerPFDO-700Fluorescence Dissolved Oxygen Online Analyzer
A full-size 49.5 × 252.3 mm optical sensor configuration with standard SUS316L and documented titanium-alloy seawater construction options.
0–20 mg/L≤0.3 MPa49.5 × 252.3 mm
Optical online analyzerPFDO-600Compact Fluorescence Dissolved Oxygen Analyzer
A slimmer 30 × 190.2 mm SUS316L sensor for projects that need the same documented optical method and automation interfaces in a more compact probe body.
0–20 mg/L≤0.2 MPaØ30 × 190.2 mm
Optical online analyzerPFDO-500Aquaculture Fluorescence Dissolved Oxygen Analyzer
The smallest documented sensor in the series—25 × 127 mm and 0.3 kg—configured for aquaculture and low-pressure continuous monitoring.
0–20 mg/L≤0.1 MPaØ25 × 127 mm
03 · Applications
Six real online dissolved-oxygen projects
Case copy on the English site is fully English. Public images remove the original Chinese information boards, third-party branding, company names and nameplates.
View full cases↗
2020 · Fujian, China · Municipal wastewater plantMunicipal wastewater plant multiparameter monitoring
In December 2020, the project deployed online COD, ammonia nitrogen, total phosphorus, total nitrogen, suspended-solids/sludge concentration, dissolved oxygen and level measurements.
Monitored parametersDOCODAmmonia nitrogenTotal phosphorus
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2020 · Guangdong, China · Zhaoqing drainage networkSmart monitoring for an urban drainage network
In July 2020, online instruments were installed at key drainage-pipe locations to collect total nitrogen, total phosphorus, dissolved oxygen and ammonia-nitrogen data.
Monitored parametersDOTotal nitrogenTotal phosphorusAmmonia nitrogen
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2019 · Hebei, China · Baoding wastewater plantWastewater plant expansion and upgrade monitoring
In May 2019, online dissolved oxygen, ORP and suspended-solids/sludge concentration analyzers were deployed at key wastewater-treatment stages.
Monitored parametersDOORPSuspended solids / sludge concentration
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2017 · Sichuan, China · Meishan municipal wastewater plantDissolved-oxygen monitoring for a treatment-capacity upgrade
In October 2017, online dissolved-oxygen and suspended-solids/sludge analyzers were installed to record oxygen and solids changes through the treatment process.
Monitored parametersDOSuspended solids / sludge concentration
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2019 · Sichuan, China · Guang'an industrial wastewater plantIndustrial wastewater plant multiparameter monitoring
In December 2019, dissolved oxygen, CODcr, pressure and flow instruments were configured for continuous collection of key treatment-water parameters.
Monitored parametersDOCODcrPressureFlow
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2022 · Hubei, China · Three Gorges area wastewater plantOnline monitoring for a wastewater-plant modernization
In May 2022, automatic sampling, CODcr, dissolved oxygen and suspended-solids/sludge instruments were installed, with key measurements transmitted to the monitoring platform.
Monitored parametersDOCODcrSuspended solids / sludge concentrationAutomatic sampling
↗04 · Common questions
Confirm this information before an inquiry
Do the four models use the same principle?+
All four supplied sheets state fluorescence quenching, 0–20 mg/L or 0–200% saturation and 0.01 mg/L resolution.
Why create four separate detail pages?+
Pressure, probe size, weight, construction and application focus differ. Separate pages improve technical selection, inquiry conversion and model-specific search visibility.
Which models have a documented seawater option?+
The PFDO-700 and PFDO-800 sheets explicitly list a titanium-alloy seawater body. Confirm that construction again in the formal quotation.
Are the clean product images dimensional references?+
No. They provide consistent public presentation. Technical dimensions and order configuration come from the verified specification and project-confirmation documents.
Contact FUNEL
Tell us what you need to measure.
We will respond with a recommended configuration, supporting documentation and quotation.