Why does the pH value jump in the display of the JBL ProFlora pH Control?
If the pH value is subject to greater fluctuation, this indicates a source of interference through another electronic device. Ballasts in light bars, for instance, create an electromagnetic field if they are not shielded against interference. This can disturb the sensitive sensor. When you unplug the power plug from the outlet the pH value suddenly stabilises. You can carry this process out with every electrical device in the aquarium to find the cause.
Through the use of separated power-carrying cables further disturbances can be avoided. Separating electrical circuits may also prove to be an advantage. The JBL pH controllers are manufactured and tested in accordance with DIN EN 55014-2 and do not interfere with other technical items. Thus wearers of pacemakers are not exposed to any danger through the JBL pH Control.
Should another technical item disturb your pH control, then it is not electromagnetically shielded according to this technical standard.
If the error still persists try removing the temperature sensor from the controller. If the value now remains stable, the temperature sensor may be defective.