Long term accurate monitoring of dissolved oxygen levels even in still water

The D-Opto range of dissolved oxygen instruments monitor dissolved oxygen levels in streams, rivers, lakes and marine environments with minimal on-site maintenance and servicing. 

Unlike conventional polarographic dissolved oxygen sensors, the D-Opto sensing element utilises fluorescence to measure dissolved oxygen – it doesn’t consume oxygen – so the measurement of dissolved oxygen by the D-Opto is unaffected by water flow.

Rugged low power consumption and low drift ideal for the remotest locations

  • Self contained
  • Simple to operate and easy to deploy
  • Minimum on-site maintenance and servicing
  • Logs data once per minute
  • Doesn’t require vigorous flow past the sensor to get a stable reading
  • Long term, time course data logged allows for more accurate assessment of oxygen dynamics
  • Quick and simple field servicing only after extended periods
  • Technology prevents bi-fouling and deposits

The D-Opto range of dissolved oxygen instruments

D-Opto Sensor

“The optical sensor on the probe is more reliable than membrane based probes that we’ve used in the past and require less frequent calibration.” – Dr Roger Young (Cawthron Institute New Zealand), following a survey of the health of 11 large rivers across New Zealand.


D-Opto Logger

Most studies of this type only have beginning and endpoint measurements. The time-course data logged by the D-Opto allows us to more accurately assess oxygen dynamics.” – Santa Barbara Coastal Long Term Ecological Research (SBCLTER Programme)


D-Opto Shutter

The D-Opto shutter system was deployed for 7 months on a telemetry buoy in the Étang de Berre, Marseille, France. Despite very heavy barnacle growth, the optical window remained clean and the D-Opto was still taking accurate measurements.