A safe centrifuge needs more than a running motor

IEC 61010-2-020:2016 is the third edition of the particular safety requirements for electrically powered laboratory centrifuges. It is used with IEC 61010-1:2010, supplementing or modifying the general requirements for this equipment. Within the IEC/EN 61010 family, electrical protection is only part of the assessment: access to moving parts and mechanical hazards also matter.

Treat the rotor and consumables as a matched system

Physical fit is not approval. Check the manufacturer-approved centrifuge-rotor combination, rotor lid, buckets, adapters and the speed/RCF limits of the tubes. Sample density and total load can affect the permitted speed. The instrument's maximum speed is not permission to run every rotor or tube at that speed. For refrigerated equipment, temperature sensing and control must also be considered within the manufacturer's operating conditions.

Balance mass and position, not just fill level

Account for the combined mass of sample, tube, cap and adapter. Equal liquid volumes can have different masses. Use a balance and follow the rotor's approved symmetrical loading patterns. Swing-out rotors have additional requirements for buckets and adapters. An imbalance alarm is a backup, not a substitute for correct loading.

In a simplified model, the imbalance force follows F = Δm × r × ω². Δm is the unbalanced mass, r the radius and ω the angular velocity, expressed in rad/s. Doubling speed with the same imbalance produces roughly four times the force. As rotational frequency rises, a small loading error becomes more significant.

An rpm setting does not tell you the RCF

rpm counts revolutions per minute. Relative centrifugal force, or RCF, expresses centrifugal acceleration relative to gravity and is reported as × g. The calculation is RCF = 1.118 × 10⁻⁵ × r(cm) × rpm². A larger radius produces a higher RCF at the same speed.

These figures are calculations, not recommended operating settings. The relevant radius depends on the tube and adapter geometry; use the value specified for the rotor. A tachometer measures rotational speed, while an RCF calculation also needs radius. Speed measurement accuracy and the permitted operating limits are separate questions.

A closed-lid signal is not proof of a secure lock

Protection must prevent access to a dangerously rotating assembly. Detecting a closed lid does not prove that its locking mechanism is holding. The sensor signal, mechanical restraint and control response to faults all matter. The protective casing is another part of the design intended to limit the consequences of rotor failure.

Removing power does not instantly stop the rotor. Never bypass the lid protection, force the lid open or try to stop the rotor by hand. Use an emergency release only as directed by the manufacturer and after verifying that rotation has stopped. There is no single waiting time that applies to every model.

Ask what happens when speed feedback fails

Depending on the design, speed feedback may use a Hall sensor, an encoder or another sensing method. Knowing the sensor type is not a complete safety assessment. Check the response to lost feedback, excessive speed and incorrect rotor selection. Detection and response time and fault detection help explain that response. Adding a speed display does not create a validated safety function.

Rotor damage and aerosol containment are different risks

Do not run a rotor with cracks, corrosion, deformation or damaged attachments. Follow its service-life limits and inspection instructions. Cleaning agents and sterilization methods must be compatible with the material. Sanding away a damaged protective coating does not restore the rotor.

Samples that present an aerosol risk need suitable, approved containment components and intact seals. Closing the outer centrifuge lid does not establish aerosol tightness. An IP rating is also not a biological containment approval. Assess the sample hazards and decontamination requirements through the laboratory's separate risk controls.

Stop when the behaviour changes

For excessive vibration, knocking, rubbing sounds or a lid fault, stop the run as instructed by the manufacturer. Do not move or handle the operating machine. Once the rotor has stopped, check loading and attachments. If the problem persists with correct loading, arrange service. Rotor-failure and casing-containment tests belong to controlled conformity testing, not user troubleshooting. For maintenance or procurement, request the instrument model, rotor identification, permitted load and speed, service history and relevant conformity documents.