Centrifuge maintenance: vibration, rotors and faults

Plan for the machine, rotors and accessories

Centrifuge maintenance is more than cleaning the chamber. The plan must cover the main unit, rotors, buckets, adapters, seals and other applicable accessories. Identify traceable components, relevant instructions, who may perform each activity and which interventions require qualified service personnel.

Set frequencies according to manufacturer instructions, use, materials processed and equipment history. A single schedule for instruments used differently may leave real risks uncovered. In shared laboratories, assign responsibility for completion and review as well as for performing each check.

The log should connect identifiers, relevant use, inspections, maintenance, faults and available or out-of-service status. Where service-life limits or usage counts apply, the system must allow checking them before authorising a run. EU GMP requires equipment to remain suitable; the plan makes that principle operational in the laboratory context.

Check the assembly before use

With the machine stopped and following instructions, check visible integrity, cleanliness, dryness and installation of operator-accessible parts. Look for residues, corrosion, deformation, tube damage and missing or deteriorated seals. Do not open service-only components or treat a quick visual check as certification of structural integrity.

Confirm that the centrifuge, rotor, vessel and adapter combination is permitted for the intended conditions. Check securing and seating and, for swing buckets, permitted movement without interference. An accessory resembling the approved one may differ in mass or geometry.

Balance the load according to the system’s specified criteria and arrangements, considering tubes, contents and relevant accessories. Liquid level alone does not demonstrate balance; do not invent generic tolerances. If a required part, compatibility information or status confirmation is missing, suspend starting and clarify the condition.

Handle vibration and noise while preserving the event

If unusual vibration or noise occurs, stop the equipment using the safe method specified in the instructions and site procedure. Keep the lid closed until complete stopping and observe additional precautions for possible leaks. Do not try to restrain an unstable machine by hand.

Do not repeat runs at increasing speeds to find where the problem appears. Absence of noise at low speed does not prove absence of damage. Clearly indicate out-of-service status so another operator does not interpret a stopped machine as available.

When safe, record the time, cycle phase, programme, set speed, messages, rotor, accessories, load arrangement and affected samples. Note what changed since the last normal run. Photographs or copies of records may help, provided they can be obtained without exposure or unnecessarily altering evidence.

Assess rotor condition and service life

Corrosion, wear, impacts, deformation and suspicious marks require competent assessment. The external surface does not necessarily reveal all damage or fatigue effects. Do not polish, file, glue or repair a rotor to make a defect disappear; do not alter holes, fastenings or protective features.

Consult limits applicable to the specific rotor: they may concern time, cycles, use or other stated conditions. Do not assume a lightly used rotor has unlimited calendar life or that a clean appearance permits exceeding an expiry date. Preserve history and identification when a rotor moves between compatible centrifuges.

If required history cannot be reconstructed, do not arbitrarily assign remaining life. The responsible person must obtain a documented assessment under the applicable instructions. Any reduction in operating limits must be specified and authorised; it is not an intuitive workaround for continued use of a damaged component.

Manage leaks and breakages according to risk

A broken tube may involve fragments, liquids and aerosols. Complete mechanical stopping is necessary but may not be sufficient for safe opening. Maintain containment and activate the procedure relevant to the material, informing the responsible person and designated safety functions.

Area access, waiting, protection, opening, removal and decontamination depend on chemical or biological risk, equipment and authorised procedures. Do not automatically transfer waiting times or disinfectant concentrations from generic guidance. A substance effective against the contaminant may be incompatible with the rotor, seals or coatings.

Collect fragments only with appropriate means and training, without handling them directly. Avoid improvised interventions and mixing products. Document known or suspected contamination and treatment before handing parts to service personnel. Operator and maintenance-worker safety must accompany equipment recovery.

Document intervention, replacements and responsibilities

The service report must distinguish observed symptom, hypothesis, demonstrated cause when available, work performed and replaced parts. “Checked” or “working” does not explain the intervention. Record component identities, compatibility authorisation, changed settings and relevant before-and-after data.

Electrical work, internal mechanical work or work on protective devices belongs to authorised personnel with the specified safe isolation. Operators must not improvise energy isolation, defeat interlocks or attempt repairs. Any functional test must follow a safe procedure consistent with the system.

Clear roles help: the operator detects and preserves the event; the equipment owner coordinates; service personnel intervene; quality and safety functions assess their respective aspects. State who authorises return to service and what evidence they need. Administrative closure of a service call is not laboratory release.

Authorise return to service and assess samples

This original matrix guides review; it does not replace instructions or assessment of the specific system.

Simulated case: vibration appears after adapters are changed. The operator stops, records the event and suspends use. Review finds accessories with a different part code from the approved one: a difference to investigate, not yet conclusive proof of cause. Compatibility, seating, balancing and possible damage are assessed, followed by authorised intervention and tests. A quiet subsequent run alone does not close the event.

Assess samples from the interrupted run and, where justified, the preceding interval: incomplete separation, thermal exposure or contamination may limit their usability. Do not automatically centrifuge again to obtain an acceptable appearance. Record the decision and rationale in the sample-preparation records.

Define the newly authorised scope and checks linked to qualification of speed, temperature and time. Keep machine, log and planning status consistent. Find related topics in the liquid handling and sample preparation hub.

Sources and scope

• UC San Diego — How to Use a Centrifuge Safely, updated 2025: maintenance, fatigue and risk management; local instructions not universalised.
• University of Kentucky — Centrifuges: checks, faults and operating responsibilities.
• University of Tennessee EHS — Centrifuge Safety, 2023: safety and event management.
• EU GMP Chapter 3 and Annex 15, 2015: maintenance, status and change assessment.
• IEC 61010-2-020:2026: public safety-standard scope, not a repair procedure.