Dissolved Oxygen Meter

SRK's dissolved oxygen (DO) analysers support the three most widely used measurement technologies — polarographic, galvanic, and optical — allowing you to select the method best suited to your process conditions and maintenance preferences. Engineered for demanding industrial and environmental applications, our analysers deliver high-precision, repeatable readings with minimal calibration and upkeep, helping reduce downtime and total cost of ownership. Measurements are available in milligrams per litre (mg/l), parts per million (ppm), parts per billion (ppb), or percentage saturation (% saturation), giving you flexibility across water treatment, aquaculture, and process monitoring applications.

Optical Dissolved Oxygen Meter

Digital Optical DO Meter

Polarographic Dissolved Oxygen Sensor

Optical Dissolved Oxygen Sensor

What Is Dissolved Oxygen (DO)?

Dissolved oxygen (DO) refers to the concentration of free, non-compound oxygen present in water, absorbed from the surrounding atmosphere or generated by aquatic plant life through photosynthesis. Its level is governed primarily by the partial pressure of oxygen in the air and by water temperature: since atmospheric oxygen levels remain largely stable, temperature is typically the dominant variable — colder water holds more dissolved oxygen than warmer water, all else being equal.

Measured in milligrams of oxygen per litre of water (mg/l), dissolved oxygen is one of the most important indicators of water quality and ecological health. Adequate DO levels are essential for supporting aquatic life and for enabling the natural microbial processes that allow a water body to self-purify. Because of this, DO monitoring is a critical parameter across wastewater treatment, aquaculture, environmental compliance, and industrial process control.