Preparing the Dissolved Oxygen Level Sensor Probe: For a new dissolved oxygen probe, first thing to remember begin by adding 7.5% KCL solution into the membrane cap as the filling solution. Follow these steps: Remove the membrane crown. Place the DO membrane on the cap and fix the crown to the electrolyte tube, covering one side of the membrane. Ensure the membrane has no wrinkles and is not punctured or damaged. Unscrew the membrane cap from the probe and fill about 2/3 volume of the cap with KCL solution. Keep the probe in a vertical position concerning the horizontal plane. Carefully screw the cap back onto the probe. Some solution overflow is acceptable to ensure the probe is fully filled with KCL solution, eliminating air bubbles. The 7.5% KCL solution acts as a suitable electrolyte in the DO Probe. The electrode tube should be free of air bubbles to prevent fluctuations in readings.
