DRETOP DW-150CA Low-Temperature Incubator

Overview

The DRETOP DW-150CA Low-Temperature Incubator is a precision-engineered environmental chamber designed for stable, reproducible temperature control across a broad operational range of −20 °C to +65 °C. Unlike standard ambient or high-temperature incubators, this unit integrates dual-mode thermal regulation—compressor-driven refrigeration and air-jacketed resistive heating—to maintain tight thermal setpoints under variable ambient loads and door-opening cycles. Its architecture follows the principles of forced-air convection with optimized internal airflow pathways, ensuring minimal thermal stratification and consistent heat transfer to samples. The system is engineered for laboratory environments requiring long-term stability in microbial culture preservation, pharmaceutical storage, biobanking support, and materials testing under sub-zero conditions—particularly where ISO 13485-compliant storage integrity, GLP-aligned documentation, or USP cold-chain validation may be required.

Key Features

• Microprocessor-based P.I.D. temperature controller with 0.1 °C resolution and real-time digital display; supports programmable alarm thresholds and audible/visual over-temperature alerts.
• Air-jacketed heating system ensures rapid thermal recovery and eliminates hot spots common in direct-heating designs; combined with a high-efficiency hermetic compressor, enables seamless transition between cooling and heating modes.
• Stainless steel interior chamber (304 grade) with removable, height-adjustable shelves and fully rounded corners for complete cleanability and compliance with ISO 14644-1 Class 7 cleanroom-compatible decontamination protocols.
• Embedded heated observation window with integrated anti-fog circuitry prevents condensation during low-temperature operation—critical for uninterrupted visual monitoring without compromising thermal integrity.
• Mechanical key lock on the double-sealed insulated door prevents unauthorized access, supporting sample security requirements in shared core facilities or regulated QC labs.
• Four-point leveling feet with locking casters enable both mobility during facility reconfiguration and vibration-dampened stability during sensitive assays.
• Compressor protection logic includes startup delay, shutdown interval control, and self-diagnostic cycling—extending service life and reducing unplanned downtime.

Sample Compatibility & Compliance

The DW-150CA accommodates a wide range of biological and non-biological specimens, including but not limited to: cryopreserved cell lines stored in cryovials (−15 °C to −20 °C), temperature-sensitive reagents (e.g., enzymes, antibodies), lyophilized standards, microbial growth media, and electronic components undergoing accelerated aging tests per IEC 60068-2-1/2. Its stainless steel interior meets ASTM F838-22 criteria for non-pyrogenic surface compatibility, while the absence of CFC/HCFC refrigerants aligns with Montreal Protocol Phase-Out Annexes and EU F-Gas Regulation (EU) No 517/2014. The unit supports optional validation packages—including IQ/OQ documentation templates and sensor mapping reports—for laboratories operating under FDA 21 CFR Part 11, ISO/IEC 17025, or GMP Annex 15 frameworks.

Software & Data Management

While the base configuration features a standalone microcontroller interface, the DW-150CA supports optional RS485 serial communication (Modbus RTU protocol) for integration into centralized lab infrastructure management systems. When equipped with the optional data logging module, it records timestamped temperature values at user-defined intervals (1 min to 24 h), stores up to 30 days of local history, and exports CSV files via USB port. Audit trails include operator ID (if paired with external authentication), parameter changes, alarm events, and power interruption logs—meeting ALCOA+ data integrity principles for regulated environments. Optional accessories include a dedicated thermal printer for hard-copy traceability and an independent mechanical over-temperature limiter for fail-safe redundancy.

Applications

• Long-term storage of temperature-sensitive biological reagents at controlled sub-zero conditions (e.g., −18 °C for DNA plasmid stocks, −20 °C for ELISA kits).
• Cultivation of psychrophilic microorganisms and cold-adapted enzymes in environmental microbiology studies.
• Stability testing of pharmaceutical intermediates per ICH Q1A(R2) guidelines under intermediate storage conditions.
• Pre-conditioning of polymer composites and semiconductor substrates prior to thermal shock testing.
• Controlled environment staging for cryopreservation workflows—including post-thaw incubation and slow-cooling ramp protocols.
• Calibration reference chambers for secondary temperature sensors used in metrology labs.

FAQ

What is the minimum operating temperature, and does it sustain −20 °C continuously?
Yes—the DW-150CA is rated for continuous operation at −20 °C, verified under ISO 105-B02 ambient load conditions (25 °C, 60% RH). Sustained performance assumes proper door seal integrity and nominal internal loading (≤70% volume).

Is the unit suitable for storing flammable solvents or volatile organic compounds?
No. This incubator is not explosion-proof nor intrinsically safe. It lacks spark-free components and ATEX/UL Class I Div 2 certification. Storage of flammables requires dedicated hazardous-materials refrigerated cabinets.

Can the temperature uniformity specification be validated per ISO 15330?
Uniformity is not published by the manufacturer, but users may perform internal mapping using calibrated NIST-traceable thermistors at 9-point grid (per ISO 15330 Annex B). DRETOP provides mounting brackets and probe routing grommets to facilitate such qualification.

Does the unit comply with FDA 21 CFR Part 11 for electronic records?
The base controller does not meet Part 11 requirements. However, when configured with the optional RS485 interface and third-party validated LIMS software (e.g., LabWare, Thermo Fisher SampleManager), full electronic signature, audit trail, and role-based access control can be implemented.