How to calibrate the EZO Complete-ORP using the Atlas Desktop software

The Atlas Scientific line of EZO Complete circuits makes building a custom monitoring system easy, but if you don’t calibrate your sensors, then what good are your readings; And can you trust them?

The accuracy of your readings is directly related to the quality of your calibration.

Calibration is not difficult, and a little bit of care goes a long way.

In this tutorial we’ll quickly go over how to properly calibrate the EZO-Complete ORP, using the 100% free Atlas Desktop software. (click here to download now)

You will need the following:

• A PC running the Atlas Desktop Monitoring software
• Micro USB cable
• An ORP probe
• ORP calibration solution
• EZO Complete-ORP

Let’s get the obvious steps out of the way first!

To connect the EZO Complete-ORP to your PC you’re going to need to use a Micro USB cable. Connect this now and run the Atlas Desktop Monitoring software.

Next, connect your ORP probe to the EZO Complete-ORP via the SMA connector; and remove the soaker bottle from the probe.

Now that’s out of the way, open the ORP calibration solution pouch.

To make the calibration process a bit easier Atlas Scientific recommends pouring the calibration solution out into a smaller cup.

It’s also a good idea to have a 2^nd cup filled with water, which we’ll use to rinse off the probe after calibration.

Looking at the Atlas Desktop Monitoring software, you should see that a blue rectangle is on the screen indicating that an ORP circuit is connected, click on this blue rectangle, to go to the ORP screen.

You are now in the ORP reading screen, from here click on the gears icon located on the bottom left corner of the screen. This will take you to the ORP calibration screen.

Within this page you can calibrate your ORP probe to any value you want, should you have a different calibration solution value other than 225mV. You can also clear the calibration from the memory in case you make a mistake or have recently attached a new probe to your EZO Complete-ORP.

Single point calibration

Begin the calibration process by placing your ORP probe into the 225mV calibration solution; Wait a minute or two for the readings to stabilize on the screen.

Once the readings have stabilized click the black “Calibrate” button. The EZO Complete-ORP has now been calibrated to 225mV

Now that you have successfully calibrated the EZO Complete-ORP, you are now ready to take readings. However, its good practice to rinse off your probe after calibration; And before placing it into your sample solution or back into the soaker bottle as mixing these solutions will throw off your readings.

Calibration should be done at least once per year.

If the ORP that’s being read is continuously on the extremes of the scale (~ -900mV or +900mV) calibration may have to be done more often.

Just in case

If you need just a bit more guidance on how to calibrate the Atlas Scientific EZO-Complete ORP, you can follow along with the video below.