Measurement basis
Confirm whether the control system uses mg/L, percent saturation or both.
Browse by parameter
Online dissolved oxygen analyzers
Monitor oxygen continuously for aeration control, biological treatment, aquaculture, surface water and industrial process decisions.
DODissolved oxygen measurement
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Fluorescence measurement for continuous monitoring
PFDO-800, PFDO-700, PFDO-600 and PFDO-500 use optical fluorescence quenching, which does not consume oxygen and does not require sample flow across the sensor. Selection depends on pressure, probe size, material, mounting and application.
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Confirm these conditions before selection
Water and material
Specify wastewater, freshwater or seawater so the appropriate sensor material can be selected.
Mounting depth
Provide immersion arrangement, cable length, access and any cleaning requirements.
Control outputs
Confirm the number of 4–20 mA channels, relays and Modbus RS485 requirements.
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Typical applications
Aeration tanksMunicipal wastewaterIndustrial wastewaterAquacultureSurface waterIndustrial process water
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Four verified FUNEL models
PFDO-800
Fluorescence dissolved oxygen analyzer
Complete online analyzer with optical sensor, field transmitter and automation outputs.
Verified facts- 0–20 mg/L or 0–200%
- 0.01 mg/L resolution
- 4–20 mA / Modbus RS485
PFDO-700
Fluorescence dissolved oxygen analyzer
Full-size ≤0.3 MPa configuration with documented SUS316L and titanium-alloy body options.
Verified facts- 0–20 mg/L
- ≤0.3 MPa
- Ø49.5 × 252.3 mm
PFDO-600
Compact fluorescence dissolved oxygen analyzer
Slim SUS316L sensor for a more compact continuous-monitoring installation.
Verified facts- 0–20 mg/L
- ≤0.2 MPa
- Ø30 × 190.2 mm
PFDO-500
Aquaculture dissolved oxygen analyzer
Smallest documented sensor for low-pressure aquaculture and compact field projects.
Verified facts- 0–20 mg/L
- ≤0.1 MPa
- Ø25 × 127 mm
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Dissolved oxygen selection questions
Does the optical sensor consume oxygen?+
No. The fluorescence method does not consume oxygen and has no sample-flow requirement for the measurement principle.
Can the PFDO series integrate with aeration control?+
Yes. The documented transmitter provides three 4–20 mA outputs, configurable relays and Modbus RS485 for integration with control systems.
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