Dissolved Oxygen Sensors

Dissolved Oxygen Sensor Applications

Water treatment dissolved oxygen monitoring equipment like the DO30G:

• Sewage treatment
• Effluent activated sludge process
• Potable water
• River monitoring 
• Intake protection
• Fish farming

OXYFERM:

• Pharmaceutical applications
• Chemical plants

Parts per billion dissolved oxygen measuring instruments like OXYGOLD G/B:

• Brewing
• Electrolysis plants
• More

Optical DO Sensors like VisiFerm:

• Biotech
• Chemical industry
• Air surveillance
• Fish farming
• Water management
• Gas and liquid phase sewage water

Low PPB Optical DO Sensors like VisiTrace:

• Power plant
• Food/beverage
• Low-downtime product quality maintenance

Dissolved Oxygen Sensor Working Principle

Membrane electrode dissolved oxygen measurement (galvanic cell, polarographic):

Without interference from the pH, oxidation, reduction substances, or turbidity of the water, this method measures a reduction or diffusion current created by dissolved oxygen concentration or oxygen partial pressure. An air layer forms on the membrane of the sensor in the water, and the oxygen concentration of that layer is in equilibrium with the water's dissolved oxygen concentration.

Optical measurement of dissolved oxygen process:

The optical oxygen sensor probes a cell culture container and uses fluorescent dye and a fiber optic reader to display a liquid's luminescence in the presence of oxygen. Higher oxygen levels yield lower emission intensities, so the DO can be measured via the luminescence peak, decay rate, or the signal phase difference.