Dissolved Oxygen sensor. Designed and manufactured here in Nelson, New Zealand. We maintain exceptionally high standards of quality and performance to bring you products you can trust.

D-Opto Optical Dissolved Oxygen technology

The D-Opto range

D-Opto optical dissolved oxygen instruments are ideal for long term monitoring of dissolved oxygen in streams, rivers, lakes and marine environments. The range consists of:

  • D-Opto Sensor
  • D-Opto Logger
  • D-Opto Shutter
D-Opto Dissolved Oxygen sensor

D-Opto Sensors

A tried and true optical Dissolved Oxygen sensor. The D-Opto is widely used by local governments and universities because of its reliability and simplicity.


D-Opto Logger reliably records Dissolved Oxygen readings

The D-Opto Logger is a fully self-contained dissolved oxygen logger, incorporating a dissolved oxygen and temperature sensor, battery and power efficient data logger in a rugged compact underwater housing.

Simple to operate and easy to deploy, the D-Opto Logger can endure long field deployments between servicing.

The field replaceable 9-volt standard battery and simple software with data graphing function makes field servicing and data downloading quick and straightforward.

The D-Opto Logger can record 10,000 data records into non-volatile memory. Each data record consists of the time and date, battery voltage, dissolved oxygen percent saturation and content (PPM) and temperature. Depending on the logging interval, the battery endurance can last over 100 days.

D-Opto Shutter open

For harsh environments and situations where bio-fouling is extreme, the D-Opto Shutter system can be fitted to the D-Opto Sensor (not currently available for the D-Opto Logger).

The Shutter is a mechanical device that simply attaches to the side of the D-Opto, and is controlled by the same data logger attached to the D-Opto.

Between measurements the Shutter completely covers and protects the optical sensing window of the D-Opto. This prevents biofouling from developing, sediments from accumulating, and protects the optical window from impact. Whenever a measurement is required, the shutter opens to expose the sensing window.

The D-Opto Shutter is simple to fit and straightforward to intergrate into existing installations. Power consumption is very low. The D-Opto Shutter features self monitoring on-board intelligence that ensures reliable operation, even in the most hostile unpredictable environment.

D-Opto Shutter closed

 D-Opto data  sheet:

Available here