Low Speed Centrifuge
Refrigerated low-speed centrifuge with 7000 rpm maximum speed, temperature control from -20°C to +40°C, and 4×1200ml capacity for temperature-sensitive sample processing.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The is a refrigerated low-speed centrifuge designed for sample preparation requiring temperature control and moderate centrifugal forces. With a maximum speed of 7000 rpm generating up to 10,956×g, this instrument accommodates four 1200ml containers for processing large volume samples. The CFC-free refrigeration system maintains temperatures from -20°C to +40°C with ±1°C accuracy, enabling temperature-sensitive separations across a wide range of applications.
This customized unit features precise speed control with ±20 rpm accuracy and programmable timing up to 99 minutes 59 seconds. The low noise operation (≤60dB) and 210kg robust construction ensure stable performance in laboratory environments. Dual voltage compatibility (110V/220V) provides installation flexibility for international laboratory settings.
How It Works
Centrifugal separation operates on the principle that particles of different densities sediment at different rates when subjected to centrifugal force. The rotor assembly spins samples at controlled speeds, generating centrifugal forces that cause denser particles to migrate toward the bottom of containers while lighter components remain in the supernatant. The relationship between centrifugal force (RCF) and rotor speed follows the equation RCF = 1.118 × 10⁻⁵ × r × N², where r is the radius in centimeters and N is the speed in rpm.
The integrated refrigeration system uses a CFC-free compressor to maintain precise temperature control during separation. This prevents thermal degradation of temperature-sensitive samples and maintains the viscosity of separation media. The microprocessor-controlled system monitors both temperature and speed parameters, automatically adjusting compressor operation to maintain the set temperature within ±1°C accuracy throughout the run cycle.
Features & Benefits
Automation Level
- semi-automated
Max. Speed
- 7000rpm
Speed Accuracy
- ±20rpm
Max. RCF
- 10956×g
Max. Capacity
- 4*1200ml
Refrigeration System
- CFC-free compressor
Timing Range
- 0~99min59s
Temp. Range
- -20℃~+40℃
Temp. Accuracy
- ±1℃
Noise
- ≤60dB
Rated Power
- 1500W
External Size(L*W*H)
- 670*820*900mm
NO.
- Rotor
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Cell Biology
- Clinical Diagnostics
- Environmental Monitoring
- Food Science
- Materials Science
- Microbiology
- Pharmaceutical QC
Power/Voltage
- AC220V, 50Hz(Standard); AC110V, 60Hz(Optional)
Weight
- 210kg
Weight
- 210.0 kg
Dimensions
- L: 90.0 mm
- W: 67.0 mm
- H: 82.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Maximum Speed | 7000 rpm with ±20 rpm accuracy | Entry-level models often offer 3000-5000 rpm with lower precision | Higher speed capability enables more efficient separation of fine particles and cellular debris in less time. |
| Temperature Range | -20°C to +40°C with ±1°C accuracy | Basic refrigerated units typically offer 0°C to 25°C range | Extended low-temperature capability preserves enzymatic activity and enables frozen sample processing protocols. |
| Sample Capacity | 4×1200ml maximum capacity | Standard models often accommodate smaller volumes or fewer positions | Large capacity configuration supports high-throughput sample processing and bulk preparation workflows. |
| Noise Level | ≤60dB operation | Older units or higher-speed models may operate at 70-80dB | Quieter operation allows placement in shared laboratory spaces without disrupting other analytical work. |
| Power Requirements | 1500W with dual voltage options (110V/220V) | Basic models may require single voltage with lower power consumption | Dual voltage compatibility provides installation flexibility for international laboratory facilities. |
| Timing Control | Programmable up to 99 minutes 59 seconds | Manual timing or shorter programmable ranges | Extended programmable timing supports unattended operation for long separation protocols and batch processing. |
This customized centrifuge offers high-capacity refrigerated separation with precise temperature and speed control. The combination of 7000 rpm capability, sub-zero cooling, and large sample capacity addresses demanding laboratory applications requiring both performance and temperature stability.
Practical Tips
Verify temperature accuracy monthly using a calibrated independent probe placed in a water-filled tube during a test run.
Why: Temperature drift can compromise sample integrity and affect separation reproducibility in temperature-sensitive protocols.
Clean condenser coils quarterly and maintain clear airflow around the unit to ensure efficient refrigeration performance.
Why: Blocked airflow reduces cooling efficiency and increases compressor workload, leading to temperature instability and premature component failure.
Pre-cool tubes and rotor for 15-30 minutes before loading temperature-sensitive samples to minimize thermal shock.
Why: Thermal equilibration prevents condensation formation and ensures stable temperature conditions from the start of the separation.
Always use properly balanced tube arrangements and secure all closures before operation to prevent dangerous rotor failure.
Why: Unbalanced loads create destructive vibrations that can damage the drive system and pose serious safety hazards to personnel.
If excessive vibration occurs during operation, immediately stop the run and check sample balance and tube integrity.
Why: Continued operation with imbalanced or damaged tubes can cause catastrophic rotor failure and extensive instrument damage.
Record actual RCF values rather than rpm settings in protocols to ensure reproducibility across different centrifuge models.
Why: RCF calculations account for rotor radius differences, enabling accurate protocol transfer between instruments and laboratories.
Inspect rotor threads and mounting hardware monthly for wear or damage, replacing components according to manufacturer guidelines.
Why: Worn rotor mounting components can lead to improper seating, vibration, and potential rotor detachment during high-speed operation.
Allow the unit to reach thermal equilibrium for 30 minutes after startup before beginning temperature-critical separations.
Why: Initial temperature overshoot and thermal cycling can affect early runs until the refrigeration system stabilizes at the set point.
Setup Guide
What’s in the Box
- BKC-VL8RD-L centrifuge main unit
- Rotor assembly (typical)
- Power cord appropriate for voltage selection
- User manual and safety documentation
- Calibration certificate (typical)
- Balance tube set (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering parts and labor with comprehensive technical support. Extended warranty and service contracts are available for high-utilization laboratory environments.
Compliance
What is the relationship between speed settings and actual RCF values for different rotor positions?
The maximum RCF of 10,956×g is achieved at 7000 rpm at the maximum rotor radius. Calculate specific RCF values using the formula RCF = 1.118 × 10⁻⁵ × r × N² where r is radius in cm and N is speed in rpm. Consult the rotor manual for specific radius measurements at different positions.
How long does the refrigeration system require to reach -20°C from room temperature?
Cool-down time depends on ambient conditions and thermal load. Consult product datasheet for specific thermal performance curves. Allow adequate pre-cooling time before loading temperature-sensitive samples to ensure stable operating conditions.
What sample container types are compatible with the 4×1200ml capacity configuration?
Container compatibility depends on the specific rotor design and adapter system. The 1200ml capacity indicates maximum volume per position. Verify container specifications and rotor compatibility charts in the technical manual for specific bottle types and secure closure requirements.
Can the unit operate continuously for extended periods, and what are the duty cycle limitations?
The unit supports programmable runs up to 99 minutes 59 seconds with the CFC-free compressor designed for continuous operation. For extended protocols or repeated runs, monitor compressor thermal cycling and consult product datasheet for recommended duty cycles and maintenance intervals.
What calibration procedures are required to maintain ±20 rpm speed accuracy?
Speed calibration should be verified periodically using a certified tachometer or strobe light measurement system. The digital control system typically maintains accuracy through internal feedback, but external verification ensures compliance with analytical protocols requiring precise RCF calculations.
How does the 210kg weight affect laboratory placement and vibration isolation requirements?
The substantial mass provides inherent vibration dampening but requires sturdy bench support and level placement. Install on dedicated centrifuge benches or reinforced laboratory furniture capable of supporting the full weight plus dynamic loads during operation.
What preventive maintenance is required for the CFC-free refrigeration system?
Regular maintenance includes condenser cleaning, refrigerant level monitoring, and compressor inspection. The CFC-free system requires specialized service procedures. Schedule annual preventive maintenance with qualified service technicians to ensure optimal cooling performance and regulatory compliance.
How does this compare to fixed-angle versus swing-bucket rotor configurations?
Rotor selection affects separation efficiency and sample accessibility. Fixed-angle rotors provide faster sedimentation and compact pellets, while swing-bucket rotors offer gentler separation and easier sample recovery. Consult rotor specifications to determine the optimal configuration for specific applications.
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