Mobile App 2.0 -- Sensor Input Calibration

Audio Transcript:
To calibrate a sensor input in Mobile App 2.0, start by going to the hardware tab and selecting a device that has calibrated inputs, like a batch module or an analog input.

Select the sensor that you want to calibrate. In this case, we'll start with pH. In this page we can specify the name of the sensor, the type, the unit type, and then the calibration type.

There are two types of calibrations, a min-max range, and a manual calibration. For pH and TDS probes, you'll use a manual calibration. This allows you to take the reading of the sensor in real time and point that towards two calibration solutions. In this case, a four pH solution, which is the Point 1 reading and a seven pH solution, which is the Point 2 reading.

You'll place the sensor in your four pH solution and then let the sensor reading equalize. Once the sensor reading has equalized and is not changing, you can tap the lock icon for calibration point 1 to lock in this reading.

Next, you'll place your pH probe in the second buffer solution of seven pH wait for the readings to change and similarly lock in that point once it's finished equalizing. Now that the reading is equalized, we just tap the lock icon for calibration point 2, and then all that is left is to save these changes as we've already made an equation that's mapping the sensor readings to two specific calibration standards.

Next for the TDS port, we'd also make a manual calibration. We'll start by tapping the TDS input and then changing the calibration type from min max range to a manual calibration for these types of sensors.

The Point 1 reading is an open air and the Point 2 reading would be your calibration standard. In this example, it's just a 3 EC conductivity standard.

You'll start by having the sensor held in open air, and once the reading for Calibration Point 1 equalizes, you'll tap the lock icon to lock that reading in.

Next, you'll place the TDS probe in your conductivity standard, wait for the readings to change, and once those readings have equalized, tap the lock icon to lock in that sensor reading. With the sensor reading equalized, all that's left is to lock in that calibration point 2 and then save changes as these readings are used to make a calibration equation that you can see at the bottom of the page.

Lastly, for sensors like tank level sensors or par level sensors that have a defined min

and max range, we can use the min-max range calibration type to calibrate those.

We can start by tapping the sensor itself, using the min-max range calibration type, and then inputting the range of values that that sensor is specced to have from its data sheet between two different endpoints. In this case, this is a 4 to 20 milliamp sensor, so calibration point 1 would be 4 milliamps and calibration point 2 would be 20 milliamps.

With this default equation put in place, this will create an equation where the sensor will read 0% at four amps and a hundred percent at 20 milliamps. All that's left is to save changes for this type of calibration, and these changes would get pushed to the controller itself.