Seametrics DO2 Dissolved Oxygen Sensor with Integrated Datalogging

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

Seametrics’ DO2 Smart Sensor is the next generation in trouble-free oxygen sensing design.

Utilizing the 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.


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

Specification :

General :

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



RS485 Modbus® RTU

Direct Modbus Read Output

32-bit IEEE floating-point

Internal Math

32-bit floating-point

Direct Modbus
Read Output

32-bit IEEE floating-point

Internal Math

32-bit floating-point

Operating Temp. Range

0° C to 55° C

Storage Temp. Range¹

-40° C to 80° C

Logging :


260,000+ records

Log Types

Variable, user-defined, logarithmic, and profiled

Programmable Baud Rate

9600, 19200, 38400

Logging Rate

8x/sec maximum


Complimentary Aqua4Plus and Aqua4Plus Lite


32 available addresses per junction
w/ batching capabilities (up to 255)

File Formats

.csv / .a4d

Power :

  •  External Power
  •  Pack Required 9–16 Vdc

Seametrics Power Pack is described below. Other power options are available.
Contact Seametrics for details

Sensor :

Measuring Range

0–25 ppm


1% of reading or 0.02 ppm
— whichever is greater

Sensitivity / Resolution

0.01 ppm below 4.00,
0.1 ppm above 4.0


0.01 ppm


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

1 Storage without batterie

NOTE: Specification can change,
please contact us to for more info

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