When using a centrifuge, which instruction is not recommended to follow every time you use it?

When using a centrifuge, which instruction is not recommended to follow every time you use it?

• A. Balance the tubes
• B. Open the lid as the centrifuge is stopping
• C. Set the timer
• D. Check tube holders for leaked liquid

Answer: (B)

Opening the lid while the centrifuge is stopping is not recommended because the rotor can still be moving or still contain dangerous residual energy as it decelerates. This is a safety risk: you could be exposed to moving parts, splashes or aerosols from leaks, and potential tube breakage. Modern centrifuges are designed with a safety interlock to prevent lid opening until the rotor is fully at rest, protecting you from these hazards. The other practices—balancing the tubes, setting the timer, and checking tube holders for leaks—are essential for safe, effective operation and sample integrity.

Opening the lid while the centrifuge is stopping is not recommended because the rotor can still be moving or still contain dangerous residual energy as it decelerates. This is a safety risk: you could be exposed to moving parts, splashes or aerosols from leaks, and potential tube breakage. Modern centrifuges are designed with a safety interlock to prevent lid opening until the rotor is fully at rest, protecting you from these hazards. The other practices—balancing the tubes, setting the timer, and checking tube holders for leaks—are essential for safe, effective operation and sample integrity.