Aanderaa 4531D Dissolved Oxygen Sensor

Sensor Maintenance

Maintenance must be conducted regularly to ensure the function and accuracy of the sensor.

Maintenance frequency	Description
Every Two Weeks	Use a wet cloth to carefully clean the sensing foil. Visually inspect for buildup of organic matter - if excessive conduct monthly cleaning maintenance regime.
Monthly	The Optode housing can be cleaned using a brush and clean water, being careful to avoid the sensing foil.

Sensor Calibration

Calibration should be conducted by an Aanderaa certified calibration laboratory. Please contact GroAqua Support to arrange calibration.

Calibration frequency	Description
Yearly	In order to ensure the optimum accuracy yearly calibration is recommended. However as long as the sensor foil has not been changed and the sampling frequency is moderate the Aanderaa Optode will normally provide stable data for years.

Fault Finding

Check K-Mote is on, if LED is not flashing, follow the diagnostics steps on the K-Mote sensor diagnostics page.

Fault	Possible Issues	Solution
Erratic sensor readings	Fouling buildup on sensor foil	Visually inspect sensor foil and clean as per the above cleaning methods.
No sensor readings	Power supply issues, cable/connector may be disconnected or damaged	Inspect sensor cable for damage, inspect connectors on K-Mote to ensure securely plugged in, inspect K-Mote power supply to ensure no damage has occurred. Ensure solar panel (if using) is orientated for optimal sun exposure and clean if necessary. Ensure K-Mote antenna is installed properly and the K-Mote is switched on.

Further Advice

Contact	Email Address	Support Link	Contact purpose
Krucial	support@krucial.com	Krucial Support	For issues with K-Devices and troubleshooting support
GrowAqua	support@groaqua.io	GroAqua Support	For issues relating directly to sensor and for the supply of spare parts/controlled reference fluid, or for further information on cleaning/calibrating the sensor.