DRETOP DW-350CB Low-Temperature Incubator

Overview

The DRETOP DW-350CB Low-Temperature Incubator is an engineered environmental chamber designed for precise, stable thermal control across a wide operational range—from cryogenic storage conditions at −40 °C to standard incubation temperatures up to +65 °C. Unlike conventional microbiological incubators, the DW-350CB integrates compressor-based refrigeration with advanced PID temperature regulation to support both biological sample preservation and low-temperature material testing applications. Its architecture meets the functional requirements of GLP-compliant laboratories conducting long-term stability studies, microbial culture under sub-zero stress conditions, pharmaceutical excipient characterization, and electronic component reliability testing per IEC 60068-2 standards. The unit operates without liquid nitrogen or external chillers, delivering self-contained, energy-efficient thermal management suitable for continuous 24/7 operation in core research and quality control facilities.

Key Features

• Microprocessor-controlled P.I.D. temperature regulation with 0.1 °C resolution and ±0.5 °C uniformity across the entire 350 L working volume;
• Compressor-driven cooling system utilizing R290 (propane) — a zero-ozone-depletion-potential, low-global-warming-potential refrigerant compliant with EU F-Gas Regulation (EU No 517/2014) and EPA SNAP program guidelines;
• Optimized internal air circulation via axial贯流 (cross-flow) fan array and baffle-guided airflow path, minimizing vertical and horizontal thermal gradients;
• Stainless steel interior chamber (SUS304) with fully removable, height-adjustable shelves; seamless welds and rounded internal corners ensure full cleanability and compatibility with autoclaving, VHP decontamination, and ISO 14644-1 Class 5 cleanroom protocols;
• Reinforced double-layer insulated door with embedded anti-fog heated observation window (25 mm thick laminated glass, resistive heating element integrated into perimeter frame);
• Security-grade keyed mechanical lock (standard on CB-series models) prevents unauthorized access—critical for regulated environments governed by FDA 21 CFR Part 11 Annex 11 data integrity expectations;
• Modular refrigeration architecture with built-in compressor protection logic: programmable start-delay intervals, minimum run-time enforcement, and automatic thermal recovery after power interruption.

Sample Compatibility & Compliance

The DW-350CB accommodates diverse sample formats including stacked Petri dishes, multi-well plates (up to 96-well), serum vials (2–50 mL), cryovials (2 mL), and PCB test boards (max. 300 mm × 300 mm). Its validated temperature performance satisfies key international test method requirements: ASTM E2875-22 (Standard Practice for Validation of Environmental Chambers), ISO 15197:2013 Annex C (for diagnostic reagent stability assessment), and USP “Environmental Conditions for Stability Testing”. All units undergo factory calibration traceable to NIST-certified reference thermistors, with optional IQ/OQ documentation packages available upon request for GMP-regulated users.

Software & Data Management

While the base configuration features a standalone 7-inch TFT-LCD touchscreen interface with real-time graphing and event logging (alarm history, door-open duration, temperature deviation alerts), optional RS485 Modbus RTU communication enables integration into centralized laboratory information management systems (LIMS) or SCADA platforms. Data export supports CSV format via USB port; audit trails record operator ID, parameter changes, and alarm acknowledgments—meeting ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) required under MHRA and EMA guidance. Optional accessories include external temperature monitoring probes (PT100 class A), independent over-temperature cut-off controllers (IEC 61508 SIL2-rated), and thermal printer modules for hard-copy SOP compliance.

Applications

• Long-term storage and viability assessment of psychrophilic microorganisms (e.g., Pseudomonas syringae, Colwellia psychrerythraea) at controlled sub-zero setpoints;
• Accelerated aging studies of polymer-based medical devices per ISO 11607-1:2019 Annex B;
• Thermal cycling validation of lithium-ion battery electrolytes and solid-state separator films;
• Stability testing of biologics formulations under ICH Q5C conditions (−20 °C and −40 °C storage tiers);
• Low-temperature curing and post-bake conditioning of aerospace-grade adhesives and composite prepregs;
• Environmental stress screening (ESS) of semiconductor packages prior to HALT/HASS qualification.

FAQ

What is the recommended maintenance interval for the DW-350CB’s refrigeration system?
Compressor oil and filter-drier replacement is advised every 24 months under continuous operation; condenser coil cleaning should be performed quarterly in non-laminar airflow environments.
Can the unit maintain −40 °C ambient temperature when loaded with 300 L of aqueous samples?
Yes—validation reports confirm ≤ ±0.8 °C deviation from setpoint at full load (water-equivalent thermal mass), provided ambient room temperature remains ≤ 25 °C and relative humidity < 60% RH.
Is remote monitoring supported out-of-the-box?
No native Ethernet or Wi-Fi capability is included; however, the RS485 interface supports third-party protocol gateways (e.g., Moxa EDS-G205A) for SNMP or MQTT-based telemetry deployment.
Does the DW-350CB comply with electromagnetic compatibility (EMC) directives for lab use?
Yes—certified to EN 61326-1:2013 (Class B emissions) and EN 61000-4 series immunity standards, with CE marking affixed per Machinery Directive 2006/42/EC.
Are calibration certificates supplied with shipment?
A factory-issued as-found/as-left calibration report (covering three-point verification at −40 °C, 25 °C, and 65 °C) is included; UKAS-accredited calibration services are available as a value-added option.