DRETOP QSK-4433H Air-Bath Orbital Shaker

Overview

The DRETOP QSK-4433H Air-Bath Orbital Shaker is an integrated constant-temperature incubation shaker engineered for precision biochemical and microbiological applications requiring simultaneous temperature control and uniform orbital agitation. Unlike water-bath shakers, this air-bath design employs forced-air convection via a high-efficiency centrifugal blower and optimized internal airflow channels—ensuring rapid thermal equilibration and exceptional temperature homogeneity across the entire chamber (±0.5°C fluctuation, ±0.1°C control accuracy). Its orbital motion (26 mm amplitude) generates gentle yet effective mixing ideal for aerobic cell culture, enzyme assays, solubility studies, and microbial growth kinetics. The unit operates within a biologically relevant range of RT + 5°C to 65°C, making it suitable for mesophilic organism cultivation, protein expression protocols, and reagent incubation in compliance with ISO 15190:2020 (laboratory safety) and CLSI EP23-A guidelines for incubator validation.

Key Features

• High-fidelity PID temperature control algorithm coupled with Pt100 resistance temperature detectors (RTDs), delivering stable setpoint maintenance under dynamic load conditions.
• LED-backlit LCD display with intuitive menu navigation; supports parameter deviation correction, power-failure memory retention, and auto-resume functionality after interruption.
• Orbital oscillation mechanism with adjustable speed (0–300 rpm) and fixed 26 mm amplitude—optimized for low-shear suspension of sensitive cells and consistent oxygen transfer in liquid cultures.
• Universal spring-loaded platform (440 × 330 mm) accommodating diverse vessel formats including Erlenmeyer flasks (up to 12 × 250 mL), test tubes, Petri dishes, and multi-well plates without adapter kits.
• Robust construction: 304 stainless steel interior chamber resists corrosion from condensate, sterilants, and organic solvents; powder-coated carbon steel exterior ensures mechanical durability and cleanroom-compatible surface integrity.
• Comprehensive safety architecture: independent over-temperature cutoff (dual-stage), real-time short-circuit detection, audible/visual alarm activation, and thermal fuse redundancy per IEC 61010-1:2010 requirements.

Sample Compatibility & Compliance

The QSK-4433H supports a broad spectrum of biological and chemical sample types—including bacterial and yeast suspensions, mammalian cell lines in serum-containing media, enzymatic reaction mixtures, antigen-antibody binding assays, and environmental water samples for BOD/COD preparation. Its chamber geometry and airflow profile are validated for uniform temperature distribution per ASTM E2500-13 (verification of laboratory equipment). The device meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and electrical safety (EN 61010-1). While not inherently 21 CFR Part 11 compliant, its logging-capable firmware (via optional RS232/USB interface) supports integration into GLP/GMP environments when paired with validated third-party data acquisition software.

Software & Data Management

The onboard microcontroller records real-time temperature and speed values at user-defined intervals (default: 1-min resolution), storing up to 30 days of operational history in non-volatile memory. Data export is supported via USB flash drive (FAT32 formatted) in CSV format—enabling traceability for audit trails and QC documentation. Optional PC-based configuration software (DRETOP LabLink v2.1) provides remote parameter setting, real-time graphing, alarm event logging, and PDF report generation aligned with ISO/IEC 17025:2017 clause 7.7 on result reporting. All firmware updates undergo regression testing against IEC 62304 Class B medical device software standards.

Applications

• Aerobic microbial culture (E. coli, Bacillus spp., Pseudomonas) in LB or TB media for plasmid amplification and protein expression.
• Mammalian cell passaging and expansion in DMEM/F12 supplemented with FBS under controlled CO₂-free conditions.
• Enzyme kinetic assays requiring precise thermal stabilization during substrate titration (e.g., LDH, ALP, or β-galactosidase activity).
• Environmental monitoring workflows: extraction efficiency optimization for PAHs or PCBs in soil leachates; nutrient dissolution studies in aquatic toxicity testing.
• Pharmaceutical QC: dissolution profile development for solid dosage forms using paddle-over-disk configurations mounted on auxiliary fixtures.
• Vaccine adjuvant formulation: colloidal stability assessment of aluminum hydroxide suspensions under accelerated aging protocols.

FAQ

What is the maximum recommended flask size for stable operation at 300 rpm?
For optimal balance and minimal vibration transmission, we recommend limiting single-vessel volume to 500 mL when operating above 250 rpm. At full capacity (12 × 250 mL flasks), sustained operation at 300 rpm is validated per DIN EN ISO 13849-1.
Can the QSK-4433H be used for anaerobic culture applications?
No—the air-bath design actively circulates ambient air; it does not support inert gas purging or O₂ depletion. For anaerobic work, consider a dedicated CO₂ incubator shaker or sealed jar systems.
Is calibration certificate included with shipment?
A factory-issued temperature and speed verification report (traceable to NIM, China) is provided. Full ISO/IEC 17025 calibration services are available upon request through authorized DRETOP service centers.
Does the unit support external temperature probe input for sample-core monitoring?
Yes—via optional PT100 extension port (QSK-EXT-TP1), enabling direct measurement of culture medium temperature independent of chamber air readings.
What maintenance intervals are specified for long-term reliability?
Blower filter cleaning every 3 months; annual inspection of RTD calibration drift and motor brush wear (if applicable); biannual verification of thermal cut-off response time per manufacturer SOP-QA-047.