Gerber Supervario-N Dairy Fat Centrifuge

Overview

The Gerber Supervario-N Dairy Fat Centrifuge is a precision-engineered, temperature-controlled benchtop centrifuge specifically designed for standardized fat determination in milk and dairy products according to internationally recognized reference methods. It operates on the principle of differential sedimentation under controlled gravitational force (RCF), enabling reliable separation of milk fat globules from aqueous and protein phases within calibrated Gerber or Roese-Gottlieb tubes. Unlike general-purpose centrifuges, the Supervario-N is optimized for low-speed, high-stability operation—critical for maintaining tube integrity, minimizing mechanical stress on fragile glassware, and ensuring reproducible fat layer formation. Its rigid stainless-steel chassis, dynamically balanced rotor assembly, and vibration-dampened base eliminate wobble or orbital drift during extended runs, directly supporting method compliance with ISO 1735:2023 (Milk and milk products — Determination of fat content — Gerber gravimetric method) and AOAC Official Method 920.131.

Key Features

• Programmable multi-method operation: Supports four standardized dairy fat analysis protocols—Gerber (ISO 1735), Roese-Gottlieb (ISO 1211), Babcock (AOAC 920.130), and solubility testing—with dedicated parameter presets.
• Temperature-regulated chamber: Maintains ambient-to-68 °C thermal stability during centrifugation, essential for consistent fat fluidity and phase separation—particularly critical for high-fat or viscous samples such as cream, condensed milk, or fermented dairy.
• High-reproducibility rotational control: Precision DC motor delivers stable speed output across the 600–1100 rpm range with ≤±10 rpm deviation, ensuring repeatable relative centrifugal force (RCF) profiles between runs.
• Robust safety architecture: Integrated automatic lid interlock prevents operation unless fully sealed; real-time imbalance detection halts rotation within <2 seconds if mass asymmetry exceeds 5 g per bucket; electronic braking brings rotor to rest in <15 s post-run.
• Durable construction: Fully welded 304 stainless-steel housing resists corrosion from acidic reagents (e.g., sulfuric acid, amyl alcohol) commonly used in Gerber assays; non-porous surfaces comply with ISO 15190:2020 laboratory equipment hygiene requirements.

Sample Compatibility & Compliance

The Supervario-N accommodates standard Gerber fat test tubes (11 mL capacity, conical calibration), Roese-Gottlieb tubes (50 mL), and Babcock flasks (17.6 mL), all mounted in fixed-angle aluminum buckets with silicone cushioning to absorb shock during acceleration/deceleration. Its operational parameters meet the mechanical and thermal specifications mandated by ISO/IEC 17025:2017 for accredited dairy testing laboratories. The device supports full traceability through manual logbook entry or integration into LIMS via RS-232 interface (optional). While not inherently 21 CFR Part 11 compliant, its programmable method storage and audit-ready run logs facilitate GLP/GMP-aligned documentation when paired with validated SOPs.

Software & Data Management

The Supervario-N features an intuitive membrane keypad interface with LED display showing real-time RPM, temperature, elapsed time, and remaining time. Four user-programmable memory slots store complete method configurations—including speed, temperature setpoint, duration, and auto-brake activation—enabling rapid recall without re-entry. All settings are retained after power cycling. No proprietary software is required; however, optional serial communication allows remote start/stop commands and timestamped run data export (speed, temp, time, error codes) for inclusion in electronic lab notebooks. Calibration certificates for speed and temperature sensors are provided with initial commissioning and recommended annually per ISO/IEC 17025 Clause 6.5.

Applications

• Routine fat quantification in raw milk, pasteurized milk, UHT milk, skim milk, and reconstituted powdered milk per national dairy standards (e.g., EU Regulation (EC) No 853/2004, USDA AMS Grade A Specifications).
• Quality control in dairy processing plants for incoming raw material verification and finished product release testing.
• Research applications involving fat stability studies, homogenization efficiency assessment, and thermal treatment impact on fat globule distribution.
• Method validation and interlaboratory comparison studies where instrument-to-instrument consistency is critical for proficiency testing (e.g., FAPAS, ILAC P15).
• Training environments in food science departments, where robustness, safety, and method fidelity support pedagogical rigor in analytical dairy chemistry.

FAQ

What centrifugation standards does the Supervario-N support?
It complies with ISO 1735 (Gerber), ISO 1211 (Roese-Gottlieb), AOAC 920.130 (Babcock), and internal solubility assay protocols requiring precise low-speed, temperature-controlled sedimentation.
Can the Supervario-N be used for non-dairy samples?
While optimized for dairy matrices, it may process other emulsified food systems (e.g., plant-based milks, infant formula) if validated per laboratory-specific protocols—but performance must be verified against reference methods due to differing fat globule size and density characteristics.
Is temperature calibration traceable to national standards?
Yes—factory calibration uses NIST-traceable RTD probes; a Certificate of Calibration is supplied, and annual recalibration is recommended per ISO/IEC 17025 requirements.
How is rotor imbalance detected and managed?
Vibration sensors monitor axial and radial oscillation in real time; if deviation exceeds 0.1 mm peak-to-peak amplitude or mass asymmetry exceeds 5 g, the system immediately cuts power and engages the brake.
Does the Supervario-N require routine maintenance beyond cleaning?
Yes—annual inspection of drive belt tension, bearing lubrication status, and lid lock mechanism function is advised; rotor lifetime is rated for 10,000 cycles under normal use conditions per manufacturer’s service bulletin SB-SV-N-2023.