Seametrics DO2 Dissolved Oxygen Sensor with Integrated Datalogging


Seametrics DO2 Smart Sensor is the next generation in trouble-free oxygen sensing design. Utilizing fluorescence of a stable, immobilized ruthenium-based film matrix, the sensor provides precision optical transmission and detection to measure oxygen concentration in the fluid outside of the sensor. Equipped with integrated datalogger and Aqua4Plus software, this sensor provides convenient, high-quality data to the user.

Seametrics DO2 Features

  • Measures and records dissolved oxygen and temperature internally
  • Modbus® RTU (RS485)
  • 260,000+ record non-volatile memory — no data loss in the event of a power failure
  • Programmable warm-up time
  • The sensor does not require water movement, flow, or frequent cleaning
  • Does not require frequent calibration
  • 1.66″ diameter—fits easily in 2-inch wells
  • Measures dissolved oxygen and temperature
  • Fluorescence sensor technology
  • No membranes, fill solutions, replacement caps, or cartridges required
  • Includes new Aqua4Plus control software for setting up flexible recording sequences, retrieving data, monitoring real-time data, and viewing collected data


  • Dam discharge monitoring aquaculture
  • Leachate monitoring (Landfill)
  • Long-term surface water monitoring
  • Monitoring remediation performance
  • Municipal and industrial water treatment facilities

Specification :

Probe Diameter 1.66” (4.22 cm)
Tube Material Acetal & 316 stainless steel
or titanium
Probe Material Epoxy, polyurethane, and PVC
Wire Seal Material Fluoropolymer and PTFE
Submersible Cable Polyurethane, polyethylene,
or ETFE available
Terminating Connector Available
Communication RS485 Modbus® RTU
Direct Modbus Read Output 32-bit IEEE floating-point
Internal Math 32-bit floating-point
Direct Modbus 32-bit IEEE floating-point
Read Output
Internal Math 32-bit floating-point
Operating Temp. Range 0° C to 55° C
Storage Temp. Range¹ -40° C to 80° C
Memory 260,000+ records
Log Types Variable, user-defined, logarithmic,
Programmable 9600, 19200, 38400
Baud Rate
Logging Rate 8x/sec maximum
Software Complimentary Aqua4Plus and Aqua4Plus Lite
Networking 32 available addresses per junction
w/ batching capabilities (up to 255)
File Formats .csv / .a4d

External Power 9–16 Vdc
Pack Required
Seametrics Power Pack described below.
Other power options are available.
Contact Seametrics for details


Measuring Range 0–25 ppm
Accuracy 1% of reading or 0.02 ppm
— whichever is greater
Sensitivity / Resolution 0.01 ppm below 4.00,
0.1 ppm above 4.0
Stability 0.01 ppm
Repeatability 0.01 ppm
Sensor Drift Less than 1% per year
Temperature Range 0° C to 55° C
Response Time 95% in less than 60 seconds
Maximum Pressure 100 psi

Other Article:


Rudy Wiratama

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