PI OxySense DO analyser range of online Dissolved Oxygen Meters utilises the very latest and best optical sensor available in the world today. It is an optical luminescent device which is extremely resistant to abrasion, extremely stable, and has greatly reduced maintenance and whole life costs. Coupled with the automatic self cleaning and self verification, the OxySense online DO analyser is as close to ‘fit and forget’ as it gets.

The OxySense Online Optical Dissolved Oxygen Analyser with self-cleaning and self-verification offers enhanced reliability and unrivalled low maintenance.

Optical DO meters have largely replaced electrochemical DO sensors (Clark Cells) due to their better reliability and lower maintenance requirements.

The OxySense DO sensor is available with different controllers giving you the same great performance with different communication, display, and control options.


  • Down to zero maintenance
  • No chemicals reagents or moving parts –  or reducing maintenance
  • Integrated self-cleaning
  • Integrated self-verification
  • Up to 36 months between cap changes
  • No initial calibration required
  • Calibration only once per year
  • Reproducible DO readings between sensors
  • Proven reliability


  • Aeration Tank for WWTP
  • SBR Tank for WWTP
  • Dissolved Oxygen Monitoring Application

Technical Specifications

TypeLumiphore Optical Dissolved Oxygen
Measure ParameterDissolved Oxygen
Range0-50mg/l or 0-500% Saturation
Accuracy and Precision±0.1mg/l from 0-8mg/l (1.25%), ±0.2mg/l from 8-20mg/l and ±10% from 20-50mg
Temperature Range> 0 up to 50°C
pH RangepH 2 ~ pH10
Salinity Range0 ~ 42ppt
Temperature CompensationAutomatically by an integrated thermistor
Permissible Over Pressure10 bar
Typical Response Limited0-50mg/l
Response TimeT90<45s, T95<60s at 25°C
Zero Point Adjustment Not necessary
CalibrationManual using water saturated air
Response CheckAutomatic with optional Autoclean
Material of ConstructionStainless steel
DimensionsDiameter approx. 38mm OD, length 259mm
Maintenance intervalsManual calibration 3-36 months, lumiphore change 24-48 months
Warranty12 months from date of first use
InterferencesAlcohols >5%, hydrogen peroxide >3%, sodium hypochlorite >3%, gaseous sulphur dioxide and gaseous chlorine

A I ANALYTICAL PTE LTD | Address 30, Kallang Place, #06-01, Singapore 339159 | Tel: +65 6459 0785 | Email: info@ai-analytical.com.sg