Hettich MIKRO 22 / 22 R
Hettich · Model MIKRO 22 / 22 R
Three complete running programs can be stored and recalled. Automatic lid locking, lid with see-through glass for speed control during centrifugation. Clearly arranged, water-protected foil keypad for entering the parameters. Stand-by mode (200R) maintains temperature / auto refrigeration shut-off after set time or when lid open. Brushless drive guarantees exceptionally smooth running and speed stability. Clearly arranged display: During centrifugation the actual values of the parameters are digitally displayed. Automatic rotor recognition. Speed (RPM): Input in increments of 10. Relative Centrifugal Force (RCF): Input in increments of 10. Temperature control in refrigerated models within a range of -20°C to +40C maintenance free frequency induction drive. Imbalance switch-off. Running time (t): Input in minutes and seconds. 2 year warranty.
Key tips
- ·Run QC controls before trusting any repair - an analyzer that passes self-test can still report clinically wrong results.
- ·Rule out a reagent lot change before opening the instrument - it can look exactly like a hardware fault.
- ·Centrifuge rotors have a hard retirement age/cycle limit regardless of visible condition - don't eyeball it.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Will not start / error at start
HighSymptoms: Error code, run will not begin, or aborts shortly after start.
Root cause: Set speed exceeds the rotor maximum, an imbalanced load, the lid / door not locked, an unapproved rotor, or a drive / control fault.
Will not reach speed / excessive noise or vibration
MediumSymptoms: Slow spin-up, rumble, or vibration during a run.
Root cause: Load imbalance, worn drive / motor bearings, a worn drive coupling, or (older units) worn motor brushes.
Chamber will not cool to setpoint
MediumSymptoms: Temperature high during a run, or slow to pre-cool.
Root cause: Compressor, condenser fan, low refrigerant, or a temperature-sensor fault.
Lid / door will not open or lock
MediumSymptoms: Lid-lock error, will not open after a run, or will not lock to start.
Root cause: Lid-lock solenoid / switch fault, or a run still winding down.
Rotor / bucket wear or corrosion
MediumSymptoms: Visible corrosion, cracks, or a bucket that will not swing; imbalance trips.
Root cause: Rotor / bucket ageing - a safety-critical wear item with a use-life limit.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Drive / motor bearings & coupling
Class Major service partRel. cost $$$R&R Difficult
Lid-lock solenoid / switch
Class Major service partRel. cost $$R&R Moderate
Speed sensor / control board
Class Major service partRel. cost $$R&R Moderate
Condenser fan / refrigeration components
Class Major service partRel. cost $$$R&R Difficult
Rotor / bucket set & O-rings
Log rotor runs; retire per the manufacturer's rotor-life programme.
Class Major service partRel. cost $$$R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Drive / motor bearings & coupling | Major service part | $$$ | Difficult |
| Lid-lock solenoid / switch | Major service part | $$ | Moderate |
| Speed sensor / control board | Major service part | $$ | Moderate |
| Condenser fan / refrigeration components | Major service part | $$$ | Difficult |
| Rotor / bucket set & O-rings Log rotor runs; retire per the manufacturer's rotor-life programme. | Major service part | $$$ | Easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Daily QC controls run and reviewed
- ·Calibration verification per assay
- ·Routine cleaning and decontamination
- ·Scheduled reagent-path and pump-tubing maintenance
Error Codes
Extracted directly from this unit's own service manual.
Overtemperature cutoutMotor over-temperature cutout tripped (>135 C, 115 V version) or the chamber / condenser over-temp switch tripped.
Let the unit cool; check the over-temp switches for continuity. Perform an Offset calibration after replacing the temperature sensor or CP.
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Error code / message in the speed display, run aborted
- Note the exact code shown in the RPM display (e.g. TACHO-ERROR, CONTROL-ERROR, ROTOCODE, imbalance).
- Perform a MAINS RESET: switch the mains switch off, wait at least 10 seconds, then switch it back on.
- For a tacho / speed error, open the lid, switch off, wait, turn the rotor vigorously by hand, then switch on - the rotor must turn during switch-on.
- Look the code up in the service manual's Error Messages chapter and follow its cause list (speed sensor B4, lid-lock motor, U320 electronics, rotor magnetic code).
- Run a functional check with a loaded rotor plus an electrical-safety test after any component replacement.
Symptom: Lid will not open (power failure or fault)
- Confirm mains is present and the unit is switched on, and that the rotor has fully stopped.
- Try a MAINS RESET.
- If it still will not open, use the mechanical emergency lid release per the manual (release cord / lever), only at standstill.
- If the lid-lock motor runs slowly or is blocked, check the mains voltage is within spec and inspect the lid-lock assembly.
- Replace a faulty lid-lock motor / micro-switch and re-test.
Symptom: Excess vibration or will not reach speed
- Stop, open the lid and re-load the rotor symmetrically with paired, equal-mass tubes; every carrier must be fitted even if empty.
- Inspect the rotor and chamber for a broken vessel or debris.
- Turn the rotor by hand and feel the drive bearing for roughness.
- Check the drive belt (belt-drive models) and motor.
- Verify speed with a tachometer after any drive work.
Technical Specs
- Maximum Speed
- 18000 rpm
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Central / core laboratory
- Point-of-care testing stations
- Blood bank
- Microbiology lab
Documents & Manuals
Related calculators
From BioLab, for work done with this kind of equipment.
Troubleshoot this device with Bio
Describe a symptom or error code. Bio answers from this device's own documented error codes, failure modes, parts, and guides.
Ask Bio