Aanderaa Oxygen Optode 4835

The Oxygen Optode 4835 is a compact fully integrated sensor for measuring the O2-concentration and temperature in shallow water.

Since oxygen is involved in most of the biological and chemical processes in aquatic environments, it is a crucial parameter to measure. Oxygen can also be used as a tracer in oceanographic studies. Aanderaa revolutionized oceanographic oxygen monitoring/research with the introduction of oxygen optodes in 2002. Applications range from shallow creeks to the deepest trenches, from tropical to in-ice/in-sediment measurements. More than 150 scientific papers have so far been published using these optodes.

These sensors are based on the ability of selected substances to act as dynamic fluorescence quenchers. The fluorescent indicator is a special platinum porphyrin complex embedded in a gas-permeable foil that is exposed to the surrounding water. This sensing foil is attached to a glass window providing optical access to the measuring system from inside a watertight housing. The sensing foil is excited by modulated blue light; the sensor measures the phase of the returned red light. For improved stability, the optode also performs a reference phase reading by use of a red LED that does not produce fluorescence in the foil. The sensor has an incorporated temperature thermistor which enables linearization and temperature compensation of the phase measurements to provide the absolute O2-concentration. The lifetime-based luminescence quenching principle offers the following advantages over electrochemical sensors :

  • Less affected by fouling
  • Measures absolute oxygen concentration without repeated calibrations
  • Excellent long-term stability
  • Less affected by pressure
  • Pressure behavior is predictable
  • Faster response time

The oxygen optode outputs data in AiCaP CANbus and RS232. The sensor can present the O2 concentration in µM, the air saturation in %, and the temperature in °C.

The SeaGuard/SmartGuard datalogger and the Smart Sensor are interfaced by means of a reliable CANbus interface (AiCaP), using XML for plug-and-play capabilities.


  • Optical lifetime-based luminescence quenching measurement principle
  • Long-time stability with a red reference LED
  • Low maintenance needs
  • Not stirring sensitive (it consumes no oxygen)
  • User friendly
  • Use with Aanderaa SeaGuard and SmartGuard Platform
  • Automatically detected and recognized
  • Use as a stand-alone sensor
  • Output format: CANbus AiCaP, RS232
  • Operating range: 0-300 meters

Specifications :



O2 -Concentration

Air Saturation

Calibration method:

2-point calibration with fully Winkler-calibrated optodes for referencing

2-point calibration with fully Winkler-calibrated optodes for referencing


Stable and rugged WTW foil

Stable and rugged WTW foil

Measurement Range:

0 – 1000 µM

0 - 300%

Calibration Range:

0 - 500 µM

0 - 150%


<0.1 µM

<8 µM or 5%

whichever is greater

0.05 %


Response Time (63%):

<30 sec

<30 sec


  • Range: -5 to +40°C (23 - 104˚F)
  • Resolution: 0.01°C (0.018°F)
  • Accuracy: ±0.1°C (0.054°F)
  • Response Time (63%): <10 sec

Output Format

  • AiCaP CANbus, RS-232

Output Parameters

  • O2-Concentration in µM, Air Saturation in %, Temperature in °C, Oxygen raw data, and Temperature raw data

Sampling Interval

  • 2 sec – 255 min

Supply Voltage

  • 5 to 14Vdc

Current drain

  • Average: 0.16 +48mA/S where S is the sampling interval in seconds
  • Maximum: 100mA
  • Quiescent: 0.16mA

Operating depth

  • 0 – 300m (0 – 984.3ft)

Elec. connection

  • 10-pin receptacle mating plug SP

Dimensions (WxDxH)

  • Ø36 x 86mm (Ø1.4”x 3.4”)


  • 118g (4.16oz)


  • Titanium, Hostaform (POM)


  • Foil Service Kit 5551
    not included: AiCap extension cable with SP 4793 SP to free-end cable 4762 SP to PC cable 4865 Set-up and config Cable 3855(6)/3855A

Download Datasheet: Aanderaa Oxygen Optode 4835

Reference: aanderaa.com

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