Calibrating a capacitive level gauge is quick and easy, and can be done in six steps. Before calibrating your capacitor, take inventory of the buttons and hardware, to first familiarize yourself with the buttons and display you’ll be monitoring.
Step 1: Press “Up” Buttons
To begin calibrating your capacitive level gauge, the first step is to connect the loop power supply and ammeter to “plus” and “minus”, and then connecting the other end to the calibrator. Press both “up” buttons, holding down for 3 seconds, then let go.
Step 2: Press ”Down” Buttons
Next, the level gauge will have to be placed in calibration mode. To do this, press both “down” buttons, holding for 3 seconds again, and let go. At this stage, there should be no water on the level gauge.
Step 3: Press “Z” Until You Reach 4mA
Now, the level gauge should be calibrated at its zero point. This is the low scale, and shows as 4mA. To reach this level, press down on the “Z” button until the display reaches 4 mA.
Step 4: Raise Water Level
Once the device gets to 4mA, fill the column with water, so that it can reach the high level of the level gauge. This is known as the “reference water”.
Step 5: Adjust Span to Indicate 20mA
After the water reaches the top of the column, it is time to get the appropriate, full scale reading of the level gauge, at 20mA. To do so, press the “S” buttons until the device reaches 20mA.
Step 6: Verify Low Water Level Is 4mA
Finally, return the water level to zero, to verify that the low water level is reading at 4mA.