Set-up
Remove the protective cap from the tip of the probe.
If the probe was not used in the previous laboratory period, unscrew the membrane cap from the tip of the probe.
Add 1 mL DO Electrode Filling Solution into the membrane cap. A plastic measuring pipette has been supplied for this purpose.
Carefully thread the membrane cap containing the fluid back onto the tip of the probe.
Place the tip of the probe into a beaker containing distilled water.
Connect the conductivity probe to the channel 1 port on the side of the Vernier interface box.
The Vernier interface box should be plugged in and a green flashing light should be displayed.
Start Logger Pro by double-clicking the icon (if available) or clicking Programs - Vernier Software - Logger Pro.
The amount of dissolved oxygen is displayed at the bottom left of the screen.
The default meter displays to the nearest 0.1. If you prefer more precision click "Data" then "Column Options" and "DO."
In the Column Options dialog box, click the options tab. Change the displayed Precision by selecting "Decimal Places" and entering a value.
The probe will be ready for use after it warms up for 10 minutes. To use the probe, insert it into the solution. The probe should be constantly moving while taking readings. A slight stirring motion should be sufficient.
Clean-up
Unscrew the tip of the probe and empty the fluid. rinse all of the internal components thoroughly with distilled water.
Use Kimwipes to dry excess moisture and let it air dry for a few minutes.
Screw the probe tip onto the probe keeping it loose.