In this video, we'll be calibrating the EXO pH/ORP sensor for Oxidation Reduction Potential using Kor Software. You can also use the EXO Handheld or the Kor Mobile App.
We have an EXO Conductivity/Temperature sensor installed, as the temperature is necessary for accurate ORP measurements.
It is important to make sure your sensors, sensor guard, and cal cup are all clean. And if you have a wiper installed, make sure that the wiper brush and brush guard are also clean.
For best practices, we suggest using a dedicated cup and guard just for calibration.
If you are using an EXO cal cup, make sure to fill to the first line from the bottom to ensure that the sensor tips are fully submerged.
Now let’s immerse the sensor in the calibration solution. While you can use any traceable ORP standard, we recommend using Zobell’s solution for ORP calibration.
ORP calibration solution is temperature-dependent and should have been shipped with a chart that indicates the solution value based on temperature after the temperature readings have stabilized. Use this chart to determine what value you should enter for ORP. EXO ORP sensors use a silver/silver chloride reference electrode.
Once the sensor is immersed, move the sonde around and give it a few taps to ensure that there are no bubbles trapped around the sensor bulb.
Kor software will indicate when your readings are stable, and you can see the actual ORP and temperature readings in real-time. You want to make sure both of these readings are stable before proceeding.
Here we can see the temperature reading is around 23 degrees Celsius, so we’ll set our calibration value to 226 mV.
Once readings are stable, we’ll click apply. You will then see the calibration summary in order to double-check the calibration values. From here, you have the opportunity to redo the calibration or proceed with completing the calibration.
ORP uses a 1-point calibration, so we’ll proceed with completion.
And now our ORP sensor is calibrated and ready for use. Be sure to check out our other EXO University videos, and thanks for watching!