DRETOP DW-350CL Low-Temperature Incubator

Overview

The DRETOP DW-350CL Low-Temperature Incubator is an engineered environmental control system designed for precise, stable thermal management across life science, pharmaceutical, and materials testing laboratories. Utilizing dual-mode thermal regulation—compressor-driven refrigeration combined with air-jacket heating—the unit maintains consistent temperature setpoints from −10 °C to +65 °C, supporting both low-temperature storage and controlled microbial growth applications. Its 350-liter working chamber is constructed with electropolished stainless steel interior walls and fully adjustable shelving, enabling flexible sample arrangement while ensuring compatibility with routine sterilization protocols (e.g., ethanol wiping, hydrogen peroxide vapor exposure). The system complies with fundamental design principles outlined in ISO 13485 for medical device-related laboratory equipment and aligns with general good laboratory practice (GLP) requirements for traceable, repeatable incubation conditions.

Key Features

• Microprocessor-based P.I.D. temperature controller with 0.1 °C resolution and real-time display of setpoint, actual temperature, and elapsed time; supports programmable over-temperature alarm with audible/visual alert.
• Embedded heated observation window with integrated anti-fog circuitry prevents condensation during low-temperature operation, preserving optical clarity without compromising thermal integrity.
• Robust mechanical architecture: cold-rolled steel outer casing with rounded corner design enhances structural rigidity and facilitates cleaning; key-locked door ensures sample security and prevents unauthorized access during long-term experiments.
• Optimized air distribution system featuring axial-flow fans and internal baffle channels ensures uniform temperature distribution (±0.5 °C stability) throughout the chamber volume, validated per ASTM E2795–19 guidelines for incubator performance verification.
• Energy-efficient compressor module with intelligent start/stop cycling and built-in delay protection extends service life and reduces thermal stress on critical components; uses R134a or R600a non-ozone-depleting refrigerant compliant with EU F-Gas Regulation (EU) No 517/2014.
• Standard 25 mm test port with stainless steel sealing cap allows external sensor integration, power feed-through, or data cable routing without breaching chamber integrity.

Sample Compatibility & Compliance

The DW-350CL accommodates a broad spectrum of biological and non-biological samples—including culture media, reagent vials, cell monolayers, lyophilized pharmaceuticals, and electronic components subjected to thermal aging tests. Its stainless steel interior resists corrosion from common lab solvents and disinfectants, and all internal surfaces are accessible for decontamination via validated wipe-down or fumigation procedures. While not certified to IEC 61010-1 for hazardous location use, the incubator meets general electrical safety standards applicable to Class II laboratory equipment. It supports audit-ready documentation workflows through optional RS485 serial interface (Modbus RTU protocol), enabling integration into centralized facility monitoring systems compliant with FDA 21 CFR Part 11 for electronic records and signatures.

Software & Data Management

The onboard controller logs temperature history at user-defined intervals (1–9999 minutes) and retains up to 10,000 data points in non-volatile memory. In the event of power interruption, the system automatically resumes prior operating parameters—including setpoint, timer status, and alarm thresholds—ensuring continuity of time-sensitive assays. Optional accessories include an independent over-temperature cut-off controller (mechanical backup), RS485 communication module for SCADA connectivity, and thermal printer output for hard-copy validation reports. Firmware updates are performed via USB interface, with version history and checksum verification embedded in each release to support change control under GLP/GMP environments.

Applications

• Low-temperature microbial cultivation (e.g., psychrophilic bacteria, fungal spore germination studies)
• Stability testing of biologics and excipients per ICH Q5C guidelines
• Controlled environment storage of pre-sterilized culture media and diagnostic reagents
• Thermal cycling validation for electronic components and polymer-based medical devices
• Environmental simulation for accelerated aging of packaging materials (ASTM D3045)
• Pre-conditioning of sensors and optoelectronic assemblies prior to calibration

FAQ

What is the temperature recovery time after door opening?
Typically ≤12 minutes to return within ±0.5 °C of setpoint following a 30-second door opening at −10 °C ambient load, verified per internal DRETOP test protocol TP-DW-003.
Can the unit operate continuously at −10 °C in a room above 30 °C?
Yes—ambient operating range is 10–32 °C with ≤70% RH non-condensing; continuous operation at minimum setpoint requires adequate ventilation clearance (≥100 mm rear/side, ≥200 mm top).
Is the stainless steel interior passivated for corrosion resistance?
Yes—grade 304 stainless steel is electropolished and passivated per ASTM A967, enhancing resistance to chloride-induced pitting in humid environments.
Does the controller support multi-step temperature ramping?
No—this model features single-setpoint control only; programmable ramp/soak functionality is available in the optional SmartTouch upgrade kit (DW-350CL-ST).
What is the expected service life of the compressor under normal lab usage?
Rated for ≥30,000 hours MTBF when operated within specified ambient and load conditions, with recommended annual preventive maintenance including refrigerant pressure check and condenser coil cleaning.