Thank you for purchasing the Smart Wireless O2 Dissolved Sensor. We pride ourselves on producing high quality products that meet with the demands of the busy classroom environment. If you have any problems using this sensor, please read this documentation in full before contacting the Data Harvest support team.


The Smart Wireless O2 Dissolved Sensor is USB and Bluetooth compatible. Using Bluetooth, a sensor can connect to mobile devices, tablets, laptops, and desktops.

The dissolved oxygen sensor is a Clark oxygen electrode. The Clark electrode was designed as a gold – platinum electrochemical cell that had the electrodes covered by a non-conducting membrane. Oxygen crossing the membrane changes the characteristics of the cell and changes the output voltage. The change in voltage can be measured and is directly proportional to the oxygen at the membrane. The electrode used by Data Harvest and others is modified to use silver and gold; this gives a considerable cost saving with very similar performance. The main difference with the silver replacing the platinum is the need for maintenance of the silver electrode.

The electrode is subject to the effects of pressure and temperature, as is the dissolved oxygen value reported.

The sensor can return the oxygen values as a % of the potential saturation of the solution or (if pressure over the solution and temperature of the solution are provided) the oxygen content as an absolute value in mg/mL