Liebherr SRFfg 5501 Explosion-Proof Laboratory Refrigerator

Overview

The Liebherr SRFfg 5501 is a certified ATEX-compliant explosion-proof laboratory refrigerator engineered for the secure, temperature-stable storage of flammable liquids, volatile solvents, and other hazardous substances in research, pharmaceutical, chemical, and quality control laboratories. Designed and manufactured in Austria, this upright unit operates within a precisely controlled range of +3 °C to +16 °C—optimized for refrigerated storage of reagents, standards, biological samples, and calibration materials requiring strict thermal integrity without freezing risk. Its core safety architecture complies fully with EU Directive 2014/34/EU (ATEX 95), ensuring intrinsic safety in Zone 1 and Zone 2 classified environments where explosive atmospheres may occur due to vapors from organic solvents, alcohols, ethers, or hydrocarbons. The unit employs forced-air circulation with high-efficiency insulation and an R600a hydrocarbon refrigerant system—selected for zero ozone depletion potential (ODP = 0) and negligible global warming potential (GWP ≈ 3)—in alignment with F-Gas Regulation (EU) No. 517/2014 and broader sustainability mandates.

Key Features

• ATEX 95 certification (Category 2G, IIB T4) validated per EN 60079-0, -1, and -7 for use in hazardous areas handling Group II gases;
• Robust mechanical locking system with dual-point engagement, eliminating reliance on electronic or battery-powered mechanisms for fail-safe access control;
• Integrated SafetyDevice™ freeze-protection logic: automatically activates if internal temperature drops below +2 °C, maintaining setpoint stability and triggering simultaneous visual and audible alarms;
• Temperature uniformity maintained within ±3.0 °C fluctuation (EN 60068-3) and ≤3.7 °C gradient across full load volume, verified under standardized test conditions (+25 °C ambient, +5 °C setpoint);
• Modular SmartModule-ready platform supporting optional LAN/WiFi connectivity for remote monitoring, data logging, and integration into centralized laboratory infrastructure;
• Five adjustable tempered-glass shelves (600 × 537 mm each), rated at 40 kg per shelf, with reinforced steel cabinet structure supporting total payload up to 300 kg;
• Energy-efficient operation (1399 kWh/year) enabled by high-performance compressor, optimized heat exchange, and low-conductivity polyurethane foam insulation (≥80 mm thickness).

Sample Compatibility & Compliance

The SRFfg 5501 is validated for long-term storage of Class I flammable liquids (e.g., acetone, ethanol, hexane, toluene) and thermally sensitive reference standards compliant with ISO/IEC 17025:2017 clause 7.2.2 (environmental condition control). Its interior liner—commercial-grade molded polystyrene—is chemically resistant to common organic solvents and non-reactive with stored materials. All electrical components—including lighting, sensors, and control circuitry—are encapsulated and intrinsically safe per IEC 60079-11. The unit meets EN 61010-1:2010 for laboratory equipment safety and carries CE marking under the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU). Documentation includes full Declaration of Conformity, ATEX certificate, and traceable factory calibration records for temperature sensors (±0.5 °C accuracy at point of delivery).

Software & Data Management

When equipped with the optional SmartModule (6145269), the SRFfg 5501 supports networked data acquisition via Ethernet or Wi-Fi. Logged parameters include real-time cabinet temperature (dual-sensor redundancy), door-open events, alarm history, and ambient temperature. Data export formats include CSV and PDF reports compatible with LIMS and ELN systems. Audit trail functionality satisfies FDA 21 CFR Part 11 requirements when deployed with validated user access controls and electronic signature protocols. Local display provides immediate readout of current temperature, setpoint, and operational status using a monochrome LCD with tactile touch buttons—designed for gloved-hand operation and immunity to solvent exposure.

Applications

• Secure storage of flammable solvents and reagents in analytical chemistry labs (e.g., GC, HPLC mobile phase preparation);
• Controlled-temperature holding of certified reference materials (CRMs) and working standards per ISO Guide 34 and ISO/IEC 17025;
• Stabilization of enzyme preparations, antibodies, and diagnostic kits requiring non-freezing refrigeration;
• Compliance-driven archiving of QC samples in GMP-regulated pharmaceutical manufacturing environments;
• Backup cold storage for biobanking workflows where secondary containment of volatile compounds is mandated;
• Integration into automated lab infrastructure via Modbus TCP or REST API (SmartModule-dependent).

FAQ

Is the SRFfg 5501 suitable for storing ethyl ether or diethyl ether?
Yes—its ATEX Category 2G IIB T4 rating covers Group II gases including ethyl ether vapor (T-class ≤135 °C), provided ventilation and handling procedures comply with local hazardous area zoning regulations.

Can temperature data be exported to a central server for regulatory audits?
Yes, via SmartModule-enabled LAN/WiFi connection, with timestamped logs, user authentication, and configurable retention policies meeting GLP/GMP audit requirements.

What maintenance intervals are recommended for long-term reliability?
Liebherr recommends annual verification of door seal integrity, condenser coil cleaning, and calibration check of temperature sensors using NIST-traceable references.

Does the unit support external probe inputs for monitoring sample-specific temperatures?
No—the SRFfg 5501 monitors only cabinet air temperature. For sample-level monitoring, external calibrated probes must be deployed independently within the chamber.

Is field reversal of the door hinge possible without tools?
Yes—the right-hinged configuration can be reversed onsite using standard hex keys; hinge hardware and gasket alignment guides are included in the accessory kit (9017739).