🔍 Key Concepts

• How a centrifugal purifier bowl is balanced during operation • Causes of excessive vibration or imbalance in a high‑speed rotating bowl • Purpose of the EPC alarm ‘emergency stopping or vibrations’ shown in MO-0127

💭 Think About

• For each option, ask: Would this condition make the purifier bowl run out of balance and shake enough to trigger an emergency stop? • Look at the illustration’s alarm legend: what kind of problems is this particular alarm meant to catch—process problems, or mechanical/vibration problems? • Consider standard operating procedures: what happens if the bowl is not assembled/cleaned correctly or sludge is not removed evenly?

✅ Before You Answer

• For every choice, decide if it would directly cause imbalance or severe vibration of the rotating assembly. • Confirm which items are mechanical assembly/maintenance issues versus normal process variations. • Before choosing “all of the above,” verify that each individual condition could reasonably create a heavy spot or looseness in the bowl.