Liebherr SRFfg 5501 Explosion-Proof Laboratory Refrigerator

Overview

The Liebherr SRFfg 5501 is an ATEX-certified explosion-proof laboratory refrigerator engineered for the secure, temperature-stable storage of flammable and explosive substances in research laboratories, chemical production facilities, pharmaceutical QC environments, and hazardous material handling zones. Designed and manufactured in Austria, this upright unit operates within a tightly controlled temperature range of +3 °C to +16 °C, with a maximum deviation of ±3 °C from setpoint—ensuring thermal integrity critical for preserving sample stability, reagent viability, and volatile compound integrity. Its fan-cooled refrigeration system utilizes environmentally optimized R600a refrigerant (global warming potential < 10), delivering consistent airflow distribution and minimized internal gradients (≤3.7 °C max gradient, ≤3.0 °C max fluctuation). The unit complies fully with IEC 61010-2-011 for electrical safety in laboratory equipment and meets mechanical robustness requirements for use in classified hazardous areas.

Key Features

• ATEX Category 3G certification per Directive 2014/34/EU, verified by electro-suisse – SEV (Notified Body 0356) against EN 1127-1, IEC 60079-0, and IEC 60079-15 for use in Zone 2 gas atmospheres
• Thermally stable interior chamber with steel construction and non-sparking internal components; no exposed wiring or ignition sources within the storage compartment
• Monochrome touch-button control panel with real-time temperature display, adjustable setpoint, and configurable alarm thresholds
• Five adjustable tempered glass shelves (600 × 537 mm usable area each), rated at 40 kg load capacity per shelf; total unit load capacity: 300 kg
• Integrated power failure alarm with visual and audible alerts upon restoration—critical for GLP/GMP-compliant cold chain monitoring
• Low-noise operation (49 dB(A)) and energy-efficient design (399 kWh/year), validated under EN 62552 for refrigerating appliances
• Optional connectivity modules available: LAN interface and WiFi-enabled remote monitoring (subject to local ATEX zoning approval)

Sample Compatibility & Compliance

The SRFfg 5501 is intended for storage of Class I, Group IIA/IIB flammable vapors (e.g., acetone, ethanol, ether, hydrocarbons) and combustible dusts where Zone 2 classification applies. Its internal architecture eliminates ignition risks via intrinsically safe electronics, sealed door gaskets, and grounded stainless-steel shelving. All electrical components—including lighting, sensors, and control logic—are certified for use in potentially explosive atmospheres. The unit bears CE marking under the Low Voltage Directive (2014/35/EU) and Electromagnetic Compatibility Directive (2014/30/EU), and its safety validation includes thermal runaway testing, surface temperature limitation (< T3 classification), and fault-condition analysis per IEC 60079-15 Annex D. It supports compliance with ISO/IEC 17025 clause 5.10.4 (sample storage conditions), USP (cold chain integrity), and EU GMP Annex 15 (qualification of storage equipment).

Software & Data Management

While the base configuration features a standalone monochrome interface, optional digital add-ons enable integration into centralized laboratory infrastructure. The LAN/WiFi module supports Modbus TCP or HTTP-based telemetry, permitting real-time logging of temperature, door status, power events, and alarm history into LIMS or electronic lab notebooks (ELN). Audit trails comply with FDA 21 CFR Part 11 requirements when deployed with validated identity authentication and electronic signature protocols. Data retention intervals are user-configurable (default: 30 days), and all logged parameters are time-stamped with traceable NTP synchronization. No proprietary software installation is required on client systems—web-based dashboard access ensures cross-platform compatibility.

Applications

• Storage of flammable solvents, catalysts, and reactive intermediates in synthetic chemistry labs
• Secure holding of calibration standards and reference materials requiring strict thermal confinement
• QC sample quarantine prior to release in pharmaceutical manufacturing (aligned with ICH Q5C stability guidelines)
• Long-term archiving of forensic evidence containing volatile organic compounds (VOCs)
• On-site storage of pyrophoric reagents and peroxide-forming chemicals in industrial R&D settings
• Backup cold storage for biobanking workflows involving solvent-preserved tissue specimens

FAQ

Is the SRFfg 5501 suitable for storing Class I, Division 1 environments?
No. This unit is certified for Zone 2 (equivalent to Class I, Division 2 under NEC/UL standards) only. It must not be installed in areas where explosive atmospheres are expected to occur continuously or frequently.
Can the temperature be calibrated internally without external tools?
Yes—the unit supports user-accessible offset calibration via the touch interface, traceable to NIST-traceable references per manufacturer’s service manual.
Does it meet FDA 21 CFR Part 11 requirements out-of-the-box?
The base model does not include Part 11 functionality; however, the optional LAN/WiFi module—when deployed with validated access controls, audit logging, and electronic signatures—enables full compliance.
What maintenance intervals are recommended for ATEX integrity verification?
Annual inspection by a certified ATEX competent person is required per EN 60079-17; Liebherr recommends quarterly visual checks of door seals, grounding continuity, and alarm function.
Is the R600a refrigerant compatible with standard HVAC service infrastructure?
R600a requires specialized recovery equipment and certified technicians trained in hydrocarbon refrigerant handling per EN 378-1; standard R134a service tools are incompatible and prohibited.