Graham-Field Grafco 410e
Graham-Field · Model Grafco 410e
The Grafco Hematocrit Centrifuge is intended to provide laboratory tests for hematocrit values (HCT) in the fields of biochemistry, microbic immunity genetics, and blood separation, as well as general clinic tests. The Grafco Hematocrit Centrifuge features a digital timer (up to 99 minutes), fixed speed, brake control, and a reading scale. This unit spins loads at a fixed speed of 12,000 RPM and includes a thermostat to regulate temperature. It can hold up to 24 capillary tubes of size 1.2mm (or 1.5mm) x 75mm.
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.
Timer / speed inconsistency
MediumSymptoms: Run ends early / late, or RPM does not match the setting.
Root cause: Tacho / speed-sensor drift or a control-board 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 $$R&R Moderate
Motor brushes (older units)
Class Periodic replacementRel. cost $R&R Moderate
Rotor / bucket set & O-rings
Log rotor runs; retire per the manufacturer's rotor-life programme.
Class Major service partRel. cost $$$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 | $$ | Moderate |
| Motor brushes (older units) | Periodic replacement | $ | Moderate |
| Rotor / bucket set & O-rings Log rotor runs; retire per the manufacturer's rotor-life programme. | Major service part | $$$ | 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
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: Will not start / error at start
- Confirm mains power, the mains switch, and check the instrument fuse / circuit breaker - replace a blown fuse (a second blown fuse means an internal fault).
- Confirm the lid is fully closed and the lid interlock is engaging.
- Confirm a speed and time (and an approved rotor) are set.
- Note any displayed error code and look it up in the manual's error table.
- Re-balance the load if an imbalance is indicated.
Symptom: Lid will not open
- Confirm the rotor has fully stopped and mains power is present.
- Press down on the front of the lid while pressing the release button.
- If a power failure, use the mechanical emergency lid release per the manual.
- Inspect the lid-lock solenoid / latch and its micro-switch.
- Replace a jammed or faulty lid-lock assembly.
Symptom: Excess vibration / will not reach speed / noise
- Stop and re-load the rotor symmetrically - opposing positions equally loaded, all carriers fitted.
- Inspect the rotor pockets and chamber for debris or a broken tube.
- Confirm the rotor is fully seated and not corroded or cracked (retire per its use-life log).
- Turn the rotor by hand and feel the drive bearing; on belt-drive units check belt tension and, on older units, the motor brushes.
- Verify speed with a tachometer after any drive work.
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
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
The caster bolt stem/screw may loosen over time causing the wheel to come off.
Related calculators
From BioLab, for work done with this kind of equipment.
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