Illustration: water-monitoring site with field instruments, an RTU enclosure and tank infrastructure.
Check irrigation or aquaculture water
Follow the selected water-quality parameter over time, then compare unusual readings with a field check. Probe placement, cleaning and calibration are part of keeping the record useful.
Monitor a water-treatment point
Treatment and process teams can collect readings from suitable tanks or lines. Confirm the medium, temperature, pressure and mounting before choosing a probe; one parameter does not describe every aspect of water quality.
Specifications & version options
Measurement principle
Fluorescence optical DO with temperature compensation
Type A range / accuracy
0–20 mg/L / ±0.3 mg/L
Type B / C range / accuracy
0–20 or 0–50 mg/L / ±0.2 mg/L
Resolution
0.01 mg/L DO; 0.1 °C temperature
Temperature channel
0–60 °C / ±0.5 °C via RS485
Response time
Type A T90 <100 s; Type B / C T90 <40 s
Show 6 more specification rows
Outputs
RS485 Modbus RTU and 4–20 mA simultaneously
Supply / power
7–28 VDC / <0.2 W
Installation
Pipe or immersion; upper and lower NPT3/4 threads
Environment
IP68; -5 to +60 °C; up to 0.8 MPa
Cable
Standard 5 m cable; other lengths quoted by project
Maintenance
Cleaning, air / zero calibration and fluorescent-cap inspection required
Need to connect this equipment to an existing controller or platform?
Share your current model, a photo or the connection you need. We help assess interfaces, power and the required configuration.
Public documents describe this product family and selection options. Wiring, register maps and compliance documents must match the model and version selected for your order.
Customer platform or an agreed third-party service
How the model is selected
Check the installation, electrical interfaces and documents before choosing the model.
Site requirement
Application, medium, mounting and environment
Hardware configuration
Signal, protocol, power and enclosure
Your quotation
Model, quantity, certificates and delivery
Connecting field equipment
Illustration: remote-monitoring integration with field enclosure, gateway, power and industrial equipment.
Choose the dissolved-oxygen type before quotation
Available configurations include three probe types with different range, accuracy, response and wetted-material scopes.
Type A covers 0–20 mg/L at ±0.3 mg/L with T90 under 100 seconds for freshwater, aquaculture and similar general-water duties.
Types B and C cover 0–20 or 0–50 mg/L at ±0.2 mg/L with T90 under 40 seconds; the wetted-material scope differs between the performance and anti-corrosion versions.
The electrical configuration provides RS485 Modbus RTU and 4-20 mA at the same time. RS485 data includes dissolved oxygen, saturation and temperature.
Show 3 more selection notes
The conservative supply limit shared by the specification and manual is 7–28 VDC. Final cable, controller input, grounding and surge protection are checked with the site.
The fluorescent surface must be kept clean and free of bubbles. Air and zero-oxygen calibration are documented; fluorescent-cap condition and replacement remain maintenance items.
The quotation confirms the final model, configuration, certificate requirements, price and availability.
Continue product selection
Compare adjacent hardware families for the same monitoring path.
Select Type A, B or C from the water chemistry, 0–20 or 0–50 mg/L range, required ±0.3 or ±0.2 mg/L accuracy, response time and wetted-material requirement.
Use the simultaneous RS485 Modbus RTU and 4-20 mA outputs only after the receiving PLC, RTU or logger inputs, register map and 7–28 VDC supply have been checked.
Provide immersion depth or pipe geometry, NPT3/4 mounting, pressure, temperature, cable run, bubble risk and cleaning / calibration access.
Compatible with
PLC, RTU or water-quality controller accepting RS485 Modbus RTU and 4-20 mA
4G or Ethernet telemetry gateways with a documented RS485 register map
Pipe or immersion installations within the pressure and temperature limits
Aquaculture, aeration-basin and surface-water monitoring points with planned cleaning and calibration access
Typical package
Selected Type A, B or C optical dissolved-oxygen probe
Standard 5 m field cable; other length stated in the quotation
Optional bracket or NPT3/4 pipe hardware selected for the installation
PLC, RTU, controller or telemetry gateway only when listed in the quotation
Register-map, wiring, calibration and maintenance notes for the ordered configuration
Applications
Instruments, enclosure, power and mounting are selected for the actual tank, well, reservoir or pump station.
Use this fluorescence optical probe for continuous dissolved-oxygen monitoring in aquaculture tanks, wastewater aeration basins, surface water and compatible process-water points. Select Type A, B or C from the required range, accuracy, response time, wetted materials and water chemistry; the variants are not interchangeable.
Aquaculture dissolved-oxygen monitoring with temperature compensation
Wastewater aeration-basin trend monitoring and alarm input
River, channel and surface-water dissolved-oxygen stations
RS485 or 4-20 mA measurement points connected to an existing PLC, RTU or logger
Which dissolved-oxygen range and accuracy should I order?
Type A is 0–20 mg/L at ±0.3 mg/L. Types B and C can be 0–20 or 0–50 mg/L at ±0.2 mg/L. Share the water type, expected normal and upset range, response requirement and corrosion conditions so the correct type can be quoted.
Does the probe provide both RS485 and 4-20 mA?
Yes. The electrical configuration provides RS485 Modbus RTU and 4-20 mA simultaneously. Confirm the PLC, RTU or logger input, register map, cable length and power arrangement before commissioning.
What calibration and maintenance does an optical DO sensor need?
The manual documents air and zero-oxygen calibration. Keep the fluorescent surface clean, prevent bubbles from remaining on it and inspect the fluorescent cap. Cap life depends on use and water conditions; it is not a maintenance-free item.
Can the dissolved-oxygen probe be used in a pipe or under water?
The scope supports pipe or immersion installation, IP68 protection, NPT3/4 upper and lower threads, operation from -5 to +60 °C and working pressure up to 0.8 MPa. The bracket, insertion arrangement and service access still need site review.
What should I provide when requesting a quote for the Optical Dissolved Oxygen Sensor for Water & Wastewater?
Application, water chemistry and expected normal / upset dissolved-oxygen range; Required Type A / B / C accuracy and response time; Water temperature, pressure, flow, immersion depth or pipe installation; Receiving PLC / RTU / logger, RS485 register-map needs, analog input and available 7–28 VDC supply
Where can I compare available model options?
Open the Application selection guide linked on this page. Use it to compare equipment options before requesting a configuration.
Will it work with my existing system?
Check the field signal, supply, protocol and receiving platform against the selected model. The connection options listed on this page are a starting point; send your equipment model or interface document so we can check the combination before ordering.
Product-family reference. Final ordered model and specifications are confirmed in the written quotation.
