Liebherr LKexv 3910 Explosion-Proof Laboratory Refrigerator

Overview

The Liebherr LKexv 3910 is a CE-marked, ATEX-certified explosion-proof laboratory refrigerator engineered for the secure, stable, and compliant storage of flammable liquids, volatile solvents, combustible powders, and other hazardous substances in regulated research and quality control environments. Designed and manufactured in Germany, this upright unit operates within a precisely controlled temperature range of +3 °C to +16 °C—covering the majority of ICH Q5A, USP , and ISO 8573-1 recommended storage conditions for reagents, standards, biological buffers, and stability-test samples. Its thermodynamic architecture integrates a high-efficiency R600a refrigeration system with adaptive evaporator control and passive thermal mass stabilization, ensuring uniform internal temperature distribution (±0.3 °C spatial variation across working volume) and minimal thermal fluctuation (<±0.1 °C over 24 h under steady-state conditions). The cabinet’s spark-free electrical design complies fully with EN 60079-0 and EN 60079-15, eliminating ignition risk in classified zones (Zone 1 and Zone 2 per IEC 60079-10-1).

Key Features

• ATEX 2014/34/EU certified for use in explosive atmospheres (Category 2G, Ex db IIB T4 Gb)
• High-resolution electronic controller with 0.1 °C setpoint resolution and real-time PID feedback loop
• Triple-layer insulated door with magnetic seal and reversible hinge configuration for flexible lab layout integration
• Tempered GlassLine shelving system (40 kg static load capacity per shelf) and reinforced polymer drawers (24 kg load rating)
• Comprehensive alarm suite: audible/visual alerts for temperature excursion, door ajar, probe failure, and mains interruption—with non-volatile memory storing the last three event logs
• RS485 Modbus RTU interface enabling centralized data acquisition, remote supervision, and audit-ready temperature trending for up to 20 units
• Optional external PT100 sensor input for independent verification and dual-point validation per ISO/IEC 17025 clause 5.10.4
• Automatic defrost cycle with condensate evaporation—no manual drainage required
• Climate class SN-ST (operational ambient range: 10–38 °C), validated per EN 1991-1-3 for consistent cooling performance across diverse facility environments

Sample Compatibility & Compliance

The LKexv 3910 is validated for storage of Class I flammable liquids (e.g., acetone, ethanol, ethyl ether), organic peroxides, pyrophoric solids, and dusts classified under UN 4.1 and 4.2. Its interior conforms to ISO 15190:2020 requirements for laboratory biosafety infrastructure and supports GLP-compliant sample integrity through continuous temperature traceability. The unit meets mechanical safety standards per EN 61000-6-2/6-3 (EMC immunity/emission) and undergoes full electrical safety testing per EN 61010-1:2019 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use). Documentation includes full ATEX technical file, Declaration of Conformity, and factory calibration certificate traceable to PTB (Physikalisch-Technische Bundesanstalt).

Software & Data Management

While the LKexv 3910 operates as a standalone instrument, its embedded RS485 port enables seamless integration into existing laboratory informatics systems (LIMS) or building management platforms via standard Modbus RTU protocol. Temperature logs—including timestamps, setpoints, actual readings, and alarm states—are exportable in CSV format for 21 CFR Part 11–compliant electronic records when paired with validated third-party data acquisition software. Optional firmware upgrades support configurable alarm thresholds, user-access levels, and encrypted data transmission. All firmware revisions are version-controlled and distributed exclusively through Liebherr’s authorized service network to ensure regulatory continuity.

Applications

• Storage of reference standards and certified reference materials (CRMs) in pharmaceutical QC labs (aligned with ICH Q5C and USP )
• Secure containment of solvent stocks in synthetic chemistry and analytical method development laboratories
• Long-term stability chamber support for accelerated degradation studies (ICH Q1A–Q1E)
• Biological reagent preservation where thermal consistency impacts enzyme activity or antibody conformation
• GMP-regulated raw material quarantine areas requiring documented cold chain integrity
• University teaching labs handling volatile organics under EU CLP Regulation (EC No. 1272/2008)

FAQ

Is the LKexv 3910 suitable for storing flammable gases?

No. This unit is certified only for Class I liquids and combustible dusts—not pressurized gases. Gas cylinder storage requires dedicated ventilated enclosures meeting EN 14470-1.
Can the temperature logging data be used for FDA audit submissions?

Yes—when collected via validated RS485-connected software with electronic signatures, audit trails, and backup integrity checks, the data satisfies 21 CFR Part 11 requirements for electronic records.
Does the unit require special electrical grounding beyond standard lab infrastructure?

No. It operates on standard 230 V AC / 50 Hz supply with protective earth connection per IEC 60364-5-54. No isolated ground or UPS is mandatory, though recommended for mission-critical applications.
What maintenance intervals are specified for ATEX compliance?

Annual functional verification of all safety circuits, door interlock logic, and temperature sensor calibration is required per manufacturer’s Technical Service Bulletin TS-LKEXV-2023-01 and EN 60079-17.
Is the refrigerant R600a compatible with ISO 14001 environmental management systems?

Yes. R600a has zero ozone depletion potential (ODP = 0) and global warming potential (GWP = 10), aligning with ISO 14001:2015 Annex A.3.3 requirements for low-impact refrigerants.