What Alfa-laval fo purifier alarm is A7-10?

During a normal sludge discharge, displacement water is added to the bowl for a pre-defined amount of time. Typically during this time, the water transducer MT4 will begin to detect a slight increase in the water content of the oil as the oil/water interface moves inward due to the added displacement water. When this change occurs, the system initiates a "shoot" momentarily opening the bowl to purge the accumulated sludge/water/dirt.

If, for some reason, that increase in the water content of the oil explained above is not detected within the preset duration of displacement water (parameter P70) after two consecutive discharges, an A7-10 alarm will be triggered.

As explained in the Alfa-Laval manual, this could be caused by a faulty bowl seal that is allowing water leakage before it can be detectd by the water transducer. Another cause may be a malfunctioning displacement water supply or a breakdown of seperator internals such as the pairing disc or pairing chamber cover that are a part of water removal system. The manual warns that non-remedied A7-10 alarms run the risk of causing equipment breakdown.