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Trips and alarms present in purifiers

Back Pressure shutdown- this measures the discharge oil pressure and alarms and initiates a shut down when below a set value. o
Bowl not open- this may be done in several ways, typically by a lever switch operated by the discharged sludge hitting a striker plate. The other method is by measuring the motor current, when the bowl opens the bowl speed is dragged down due to friction effects of the discharging sludge and water. The motor current rises until full speed is re-established. This is detected by a current sensing relay

Water in oil- This found on modern designs which have a detection probe mounted in the oil discharge  High temperature alarm and shut down
Low control/seal water pressure. Where control water is supplied via a fixed small header tanks a float switch may be fitted. High vibration shut down
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