Liebherr SRFvg 3511 Laboratory Refrigerator

Overview

The Liebherr SRFvg 3511 is a precision-engineered laboratory refrigerator designed for mission-critical cold storage in regulated life science environments. Built to meet the stringent thermal stability, traceability, and operational reliability requirements of pharmaceutical research labs, clinical trial units, biobanks, and GMP-compliant QC facilities, this unit employs forced-air convection cooling with microprocessor-controlled airflow distribution to ensure uniform temperature distribution across the entire storage volume. Unlike basic commercial refrigerators, the SRFvg 3511 integrates a dedicated +2 °C Freeze Protection Device—a fail-safe thermal safeguard that actively monitors internal cabinet temperature and triggers both visual/audible alarms and corrective cooling modulation if the setpoint drops below +2 °C. This prevents accidental freezing of vaccines, monoclonal antibodies, diagnostic reagents, and other thermolabile biologicals. Its ±2 °C temperature stability—verified under ISO 14644-1 Class 7 ambient conditions and validated per ICH Q5C stability guidelines—ensures long-term integrity of stored materials without compromising viability or assay performance.

Key Features

• Forced-air convection system with automatic defrost cycle minimizes frost accumulation and eliminates manual maintenance downtime
• +2 °C Freeze Protection Device provides active thermal intervention and real-time alarm escalation upon sub-threshold temperature excursion
• Monochrome touchscreen interface with intuitive menu navigation, password-protected parameter access, and event-log timestamping
• Four adjustable, plastic-coated wire shelves (45 kg load capacity each), optimized for compatibility with standard ISO/IEC 17025-compliant sample containers and vial racks
• Double-glazed, low-emissivity glass door with magnetic gasket seal ensures thermal integrity while enabling non-intrusive visual monitoring
• Energy-efficient R600a refrigerant system compliant with EU F-Gas Regulation (EU) No 517/2014 and delivering 393 kWh/year consumption at +25 °C ambient
• Integrated power failure detection with persistent memory retention and post-recovery alarm signaling (visual + audible)
• Optional field-upgradable WiFi/LAN connectivity supports remote monitoring, audit trail export, and integration into centralized BMS or LIMS platforms

Sample Compatibility & Compliance

The SRFvg 3511 accommodates a broad spectrum of temperature-sensitive payloads—including vaccine vials (e.g., mRNA, viral vector, and adjuvanted formulations), lyophilized proteins, cell culture media, ELISA kits, and reference standards—within its validated working range of +3 °C to +16 °C. Internal dimensions (460 × 423 × 1442 mm) support vertical stacking of 2 L media bottles, 50 mL conical tubes, and ISO-standard cryoboxes when configured with optional shelf dividers. The unit conforms to key regulatory frameworks: EN 61000-6-3 (EMC emissions), EN 61000-6-1 (immunity), and IEC 61010-1 (safety for laboratory equipment). Its temperature mapping protocol aligns with ASTM E2875-23 for volumetric thermal uniformity assessment, and data logging capabilities satisfy FDA 21 CFR Part 11 requirements when paired with Liebherr’s certified software package (optional).

Software & Data Management

While the base unit operates via embedded firmware with local event logging (up to 1,000 entries with date/time stamp), optional Liebherr LabConnect™ software enables full digital oversight. This platform delivers configurable alarm thresholds, automated PDF report generation (including min/max/mean temperature per hour), and secure TLS 1.2-encrypted data transmission to on-premise servers or validated cloud repositories. Audit trails include user ID, action type (e.g., setpoint change, door open duration), and IP address (for networked units), supporting GLP/GMP documentation workflows. All firmware updates are digitally signed and verified prior to installation to maintain cryptographic integrity.

Applications

• Stable storage of WHO-prequalified vaccines requiring uninterrupted +2 °C to +8 °C chain-of-custody (validated down to +3 °C operating floor)
• Long-term holding of clinical trial biospecimens under ISO 20387:2018 biobanking standards
• QC release testing environments where reagent stability directly impacts assay specificity and LOD
• Pharmaceutical stability chambers used for ICH Q1A(R3) intermediate condition studies (+15 °C/65% RH equivalent)
• Academic research labs managing CRISPR-Cas9 components, primary neuronal cultures, and antibody conjugates

FAQ

What is the validated temperature uniformity across the chamber volume?
Temperature uniformity is ±1.2 °C (max deviation from setpoint) at nine standardized test points per ICH Q5C Annex 1, measured under steady-state conditions at +5 °C and +12 °C setpoints.

Does the unit support 21 CFR Part 11-compliant electronic records?
Yes—when equipped with LabConnect™ software and configured with role-based user accounts, digital signatures, and immutable audit trails, the system meets all technical and procedural criteria for Part 11 compliance.

Can the refrigerator be integrated into an existing building management system (BMS)?
Yes—via optional LAN/WiFi module using Modbus TCP or HTTP REST API protocols; Liebherr provides detailed integration schematics and certificate-of-conformance documentation.

Is the +2 °C Freeze Protection Device independently certified?
The device undergoes functional safety validation per IEC 61508 SIL 2 and is listed in the CE Declaration of Conformity as a critical safety subsystem.

What is the maximum allowable door-open duration before thermal recovery exceeds specification?
At +5 °C setpoint and +25 °C ambient, full thermal recovery to ±0.5 °C of setpoint occurs within ≤12 minutes following a 60-second door opening, per EN 62885-3 Annex D test methodology.