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


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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 Conductivity, using the 100% free Atlas Desktop software. (click here to download now)

You will need the following:

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

To connect the EZO Complete-Conductivity 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 Conductivity probe to the EZO Complete-Conductivity via the SMA connector.

Atlas Scientific offers 3 different K values for conductivity. K 0.1, K 1.0 and K10.

It’s important to know which K value probe you are using during calibration.

Now that’s out of the way, open both of the conductivity K 1.0 calibration solution pouches.

Do not place your K 1.0 probe into the calibration solutions yet.

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

Make sure when calibrating your probe, you use the correct calibration solution to match the K value of your probe. Using the incorrect calibration solutions will throw off your readings.

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

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

Within this page you can calibrate your Conductivity probe to the specific µS (microsiemens) based off the K value of your probe. 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-Conductivity.

Selecting the K value and dry calibration

Before you place your probe into the calibration solutions, you’ll need to specify which probe K value you are using within the Atlas Desktop software and then perform a dry calibration.

Let’s start by selecting the K value; You should see 4 buttons directly under the current reading located at the top left of your screen.

Since we are using the K 1.0 probe, select the K 1.0 button. Next click the “Calibrate Dry” button next to the large 1 on the right side of the screen. When you do this, you may not notice any change to the readings, as your probe should be reading 0.0.

Calibrating both low point and high point

Now that the dry calibration is complete, we can begin to calibrate both our low and high points.
Before placing the probe into the solutions, you need to tell the Atlas Desktop software which calibration solutions you are using, in this case we are using both K 1.0 Low (12,880µS) and high (80,000µS).

Select 12880 in the drop down menu for section 2 “Low point calibration” and then select 80000 from the drop down menu for section 3 “high point calibration”.

Now place your probe into the low point solution (12,880µS). Wait a minute or two for the readings to stabilize on the screen. Once the readings have stabilized click the black “calibrate low” button.

It’s important to note that when calibrating the low point, the readings will not change until you have finished calibrating both low and high points.

Next, place your probe into the high point solution (80,000µS). Again, wait for the readings to stabilize, then click the “calibrate high” button.

The EZO Complete-Conductivity is now completely calibrated, 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.

One and done

A properly calibrated conductivity probe will never need recalibration. Once calibrated, you can use the probe continuously year after year without concern. This is because a conductivity probe does not contain any parts that wear out over time.

However, changing the cable length of the probe may require recalibration.

Just in case

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

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