Dueperthal EX-Proof Upright Refrigerator

Overview

The Dueperthal EX-Proof Upright Refrigerator is an intrinsically safe, certified hazardous-area storage solution engineered for laboratories, pharmaceutical cleanrooms, chemical R&D facilities, and industrial QC environments where flammable, volatile, or pyrophoric substances require temperature-controlled containment under strict ATEX and IECEx regulatory frameworks. Designed and manufactured in Germany, this upright refrigerator operates on a hermetically sealed refrigeration circuit with explosion-proof compressors, non-incendive control electronics, and spark-free interior components—ensuring zero ignition risk in classified zones. Its core function is not general-purpose cooling but the secure, compliant, and traceable preservation of hazardous samples—including Class I flammable liquids (e.g., acetone, ethanol, ether), corrosive reagents (HCl, HNO₃, NaOH solutions), toxic standards (cyanides, organophosphates), environmental water matrices, and unstable biological media—within a thermally stable +2 °C to +8 °C envelope. Unlike standard lab refrigerators, it integrates structural explosion containment (pressure-relief venting), electromagnetic interference (EMI)-shielded wiring, and passive thermal inertia to prevent thermal runaway during power anomalies.

Key Features

• ATEX Category 2G and IECEx Certified for Zone 1 (gas/vapor) and Zone 2 operation per EN 60079-1 (flameproof enclosure “d”) and EN 60079-7 (increased safety “e”)
• Dual-wall cold-rolled steel construction with 50 mm flame-retardant polyurethane insulation; exterior finish: electrostatic epoxy-polyester coating (RAL 7035)
• Interior chamber fabricated from AISI 304 stainless steel with rounded, weld-free corners for corrosion resistance and decontamination compatibility
• Intrinsically safe evaporator fan, LED lighting, and temperature sensor—all rated Ex ib IIB T4 Gb
• Self-closing, double-gasketed door with mechanical three-point locking and visual door-open alarm (audible + dry-contact output)
• Optional factory-installed 4–20 mA analog output or RS485 Modbus RTU interface for integration into BMS or LIMS platforms
• No internal switches, sockets, or user-accessible electronics—compliant with IEC 60079-14 installation requirements

Sample Compatibility & Compliance

This unit supports long-term storage of UN-rated hazardous materials per GHS classification, including Packing Group I–III flammables, oxidizers, organic peroxides, and acute toxins. It is validated for use with aqueous acidic/basic solutions (pH 0–14), halogenated solvents, nitro-compounds, and cryo-stabilized reference standards. All internal surfaces resist 72-hour exposure to 37% HCl, 65% HNO₃, and 50% NaOH without degradation. Compliance extends to EU CLP Regulation (EC) No. 1272/2008, OSHA 29 CFR 1910.106, NFPA 45 (Standard on Fire Protection for Laboratories Using Chemicals), and ASTM E2513 (Standard Guide for Safe Storage of Flammable Liquids). Units are supplied with full EU Declaration of Conformity, test reports from notified bodies (e.g., PTB, SGS), and installation documentation aligned with IEC 60079-14.

Software & Data Management

While the base model operates via analog thermostatic control, optional digital controllers provide GLP-compliant data logging: ±0.3 °C accuracy, 1-minute sampling interval, 30-day onboard memory, and USB export (CSV). The system supports 21 CFR Part 11–ready audit trails when paired with Dueperthal’s optional D-LogEX software—enabling electronic signatures, role-based access control, alarm event timestamping, and deviation reporting. All logged parameters (temperature, door status, power fault, alarm activation) are time-stamped with UTC synchronization and retain integrity during mains interruption via supercapacitor backup.

Applications

• Pharmaceutical stability chambers storing ICH Q5C reference standards under GMP Annex 15 conditions
• Environmental labs holding EPA Method 502/503/524 preserved water samples prior to GC-MS analysis
• Chemical manufacturing QA/QC departments storing raw material batches of monomers, catalysts, and initiators
• Academic research labs handling lithium battery electrolytes, metal-organic frameworks (MOFs), or Grignard reagents
• Hospital pathology departments storing formalin-fixed tissue specimens with flammable fixative blends
• Nuclear facilities storing scintillation cocktail vials containing toluene/xylene-based solvents

FAQ

What hazardous area classifications does this refrigerator support?
It is certified for Zone 1 (continuous or frequent hazard presence) and Zone 2 (infrequent or short-duration hazard) per ATEX 2014/34/EU and IECEx, covering gas groups IIA (propane), IIB (ethylene), and IIC (hydrogen/acetylene), with temperature classes T4 (≤135 °C surface temp) to T6 (≤85 °C).
Can it be installed in a fume hood or ventilated enclosure?
No—this unit requires free-air ventilation around condenser coils and must be placed in ambient conditions meeting EN 60079-14 Section 6.2.1 (max. 40 °C ambient, 20–80% RH non-condensing). Enclosure compromises thermal management and voids certification.
Is validation documentation provided?
Yes: Factory calibration certificate (traceable to DKD/DAkkS), IQ/OQ protocol templates, and FAT report—including temperature uniformity mapping (±1.5 °C across all shelf levels at steady state) and door-open recovery testing (≤15 min to re-stabilize after 30-sec opening).