DS TLW5R Gerber Centrifuge for Milk Fat Determination

Overview

The DS TLW5R Gerber Centrifuge is a purpose-built, regulatory-compliant instrument engineered specifically for fat quantification in milk and dairy products according to standardized methods including the Gerber and Babcock procedures. It operates on the principle of differential sedimentation under controlled centrifugal force and thermal conditioning: samples—pre-treated with sulfuric acid and amyl alcohol—are subjected to precisely regulated rotation (1500 rpm, 2200 ×g) while simultaneously maintained at a stable temperature ≥50°C. This integrated heating function eliminates the need for pre-warming in external water baths, minimizes operator variability, and ensures reproducible phase separation of fat from protein and aqueous phases—critical for compliance with ISO 2446:2016, IDF 105:2017, and national food safety standards (e.g., GB 5009.6–2016). Designed for routine quality control laboratories in dairies, third-party testing facilities, and regulatory inspection units, the TLW5R delivers consistent, auditable results under GLP and GMP-aligned operational protocols.

Key Features

• Integrated thermostatic control system maintaining sample temperature between ambient +10°C and 65°C—optimized for Gerber method’s requirement of ≥50°C incubation during centrifugation.
• Fixed-angle rotor accommodating eight standardized Gerber fat tubes (10 mL capacity), ensuring uniform radial orientation and minimal tube tilt-induced error.
• True-color TFT touchscreen interface with intuitive icon-driven navigation—enabling rapid parameter entry (speed, time, temperature) without training overhead.
• Microprocessor-based closed-loop speed regulation with ±50 rpm accuracy, verified across full load range and validated per ISO 15195:2022 calibration guidelines.
• AC frequency-converter motor with direct drive architecture—eliminating belt wear, reducing mechanical drift, and enhancing long-term rotational stability.
• Acoustic enclosure design achieving ≤60 dB(A) noise emission at 1 m distance—suitable for shared laboratory environments without dedicated acoustic isolation.
• Fail-safe rotor recognition logic and automatic imbalance detection compliant with IEC 61000-6-3 EMC requirements.

Sample Compatibility & Compliance

The TLW5R accepts only standardized Gerber-type fat tubes (ISO 707:2019 Annex A), compatible with both raw milk and processed dairy matrices—including pasteurized, UHT, skim, whole, and reconstituted powdered milk. Its thermal and mechanical parameters align with the mandatory conditions specified in AOAC Official Method 920.118 (Gerber Fat Method) and IDF Standard 105:2017. All operational settings—including time, temperature, and speed—are logged with timestamp and user ID in non-volatile memory, supporting traceability for FDA 21 CFR Part 11–compliant audit trails when integrated with validated LIMS platforms. The device carries CE marking under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), and meets IP20 ingress protection for typical laboratory use.

Software & Data Management

While the TLW5R operates as a standalone benchtop instrument, its embedded firmware supports USB export of run logs (CSV format) containing date/time stamp, set parameters, actual achieved speed/temperature, duration, and operator ID. These logs are structured for seamless import into laboratory information management systems (LIMS) or electronic lab notebooks (ELN). No proprietary software installation is required; exported files conform to ASTM E1384–22 data interchange conventions. For high-throughput labs, optional RS-232 serial output enables integration with automated workflow controllers—supporting batch-level start/stop commands and real-time status polling (ready, running, complete, fault).

Applications

• Routine fat content analysis in raw milk collection centers per national dairy grading schemes.
• Quality assurance testing of finished dairy products (cheese, yogurt, butter, infant formula) prior to release.
• Regulatory surveillance by food safety authorities conducting official compositional verification.
• Method validation studies comparing Gerber results against reference techniques (e.g., Mojonnier gravimetric or near-infrared spectroscopy).
• Educational use in food science curricula for hands-on instruction in standardized dairy analytics.

FAQ

Is the TLW5R compliant with international dairy testing standards?
Yes—the instrument satisfies the mechanical and thermal specifications required by ISO 2446, IDF 105, and AOAC 920.118 for Gerber fat determination.

Can it be used for non-dairy samples such as plant-based milks?
No—its calibration, rotor geometry, and thermal profile are optimized exclusively for mammalian milk matrices per regulatory method constraints.

Does it support audit-trail generation for GMP environments?
Run logs include immutable timestamps and user identifiers; when paired with validated LIMS, full 21 CFR Part 11 compliance is achievable.

What maintenance is required to ensure long-term accuracy?
Annual speed and temperature calibration using NIST-traceable tachometers and PT100 probes is recommended; rotor lifetime is rated for 10,000 cycles at maximum load.

Is rotor balancing necessary before each run?
No—the fixed-angle Gerber rotor is factory-balanced and designed for symmetrical loading of eight identical tubes; no manual balancing is required.