Conductivity calibration of the DIGICHEM Plus+ Controller from Convergent Water Controls (CWC) is quick & easy.
The comparative method is used whereby an independent measurement is taken (from perhaps a handheld meter) and calibration is then set according to that measurement. Please watch for more detail ..



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Hi. I'm Larry from CWC. Today I'm going to explain to you how to calibrate a DIGICHEM Plus+ controller and also reset the calibration on the controller.

The correct method for calibrating a DIGICHEM Plus+ controller or any other DIGICHEM controller for that matter is using the comparative method, which means that you, in order to calibrate it, need to take an independent measurement from another meter which has been calibrated before and then calibrate the controller to match that reading.

For instance, it's currently reading 883, but let's presume that the actual reading taken by an independent measurement is 1000. I'm going to explain how to actually reset it and calibrate it to that value.

The first step is to disconnect the lead from the back of the conductivity probe or sensor that's in the manifold. As you will see, the reading is now dropping down, but you don't need to wait for it to go down to zero or close to it, just go straight into the menu. Then hold the down arrow button, scroll down to calibration, press enter, press enter on microsiemens TDS calibration, scroll down to reset and press enter. Change no to yes and press enter. It now says “please wait” and then goes back to the main screen.

The second step is to go back into the calibration menu, just like we did before. Go to Calibration and press enter and then press enter again. Now we select the zero calibration, press enter, confirm. Yes. Enter. That now calibrates the zero reading. What we do now is we actually then plug the cable back into the sensor or the conductivity probe and we observe the reading on the screen. As you can see, the reading has now climbed up to 900, decaying a bit, it will settle down eventually on a value, as you can see there it's 882.

Now, as I said before, we deemed this reading to be incorrect because we've taken independent measurement in this example, which should be 1000. So what we do now is we actually calibrate the slope so we go back into the calibration menu. Whilst I'm doing that I just need to point out that if the reading is that far away from the actual reading, if it's more than 50% away from the actual conductivity reading, then the actual sensor could be faulty and it'd be worthwhile trying another sensor to see if you get a reading closer to that.

So we go back to the calibration menu. Press enter again, and we press enter on slope. And as you can see, it's now reading 882 which was the previous reading. What we simply do is we increase that value to 1000. We set it to 1000 and we press enter. It will show “Calibrating” and goes back to the main screen.

And as you can see, the reading is climbing and would eventually settle down on 1000 or very close to it. And that's the procedure for calibrating the conductivity on a DIGICHEM Plus+.

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