Zhicheng ZWF-200 Reciprocating Full-Temperature Multi-Amplitude Orbital Shaker

Overview

The Zhicheng ZWF-200 Reciprocating Full-Temperature Multi-Amplitude Orbital Shaker is an engineered platform for precise, reproducible cultivation and biochemical agitation under tightly controlled thermal and mechanical conditions. Designed for applications requiring simultaneous regulation of temperature and oscillatory dynamics—such as aerobic microbial growth, enzyme kinetics assays, hybridization protocols, and mammalian cell suspension culture—the instrument employs a robust eccentric cam-driven reciprocating motion coupled with forced-air convection heating and cooling. Its core architecture integrates a brushless AC induction motor delivering constant torque across the full 30–240 rpm speed range, eliminating carbon brush wear and ensuring long-term rotational stability. Unlike conventional orbital shakers relying on fixed-radius cranks, the ZWF-200 implements a multi-step eccentric drive system that enables discrete amplitude selection (centered at Φ40 mm), allowing users to modulate shear stress and oxygen transfer rates (k_La) without altering frequency—a critical capability for optimizing dissolved oxygen profiles in bioreactor-scale simulations.

Key Features

• Full-temperature operation from 4 °C to 60 °C with ±0.1 °C resolution and ≤±0.1 °C stability at 37 °C—validated per ISO 17025 traceable calibration protocols;
• Reciprocating orbital motion generated via precision-machined eccentric cam assembly, offering high mechanical repeatability and low vibration transmission to adjacent instrumentation;
• PID-based microprocessor controller with environmental scanning logic continuously adjusts heating/cooling output and motor drive signals to maintain setpoint fidelity under dynamic load conditions;
• Backlit LCD interface displays real-time temperature, speed, amplitude setting, elapsed time, and remaining timer duration—parameters are password-locked to prevent accidental modification during GLP-compliant runs;
• Intelligent soft-start circuitry ensures ramped acceleration (<10 s to target rpm), minimizing inertial shock to fragile cultures or viscous media;
• Dual safety architecture: independent thermal cut-off (bimetallic + digital sensor redundancy) and motor overheat detection with automatic power isolation;
• Power-fail recovery function retains all active settings and resumes operation at pre-interruption state upon grid restoration—essential for unattended overnight experiments;
• Electrostatically coated steel chamber with tempered glass viewing window and seamless stainless-steel interior (304 grade) for corrosion resistance and ease of decontamination.

Sample Compatibility & Compliance

The ZWF-200 accommodates standard laboratory vessels including Erlenmeyer flasks (50–1000 mL), test tubes, deep-well plates, and custom bioreactor bags mounted on its 435 × 420 mm platform. Its 69 L chamber volume supports up to 25 × 50 mL tubes or 5 × 1000 mL flasks simultaneously while maintaining uniform thermal distribution (≤±1 °C deviation across chamber volume at 37 °C). The system complies with IEC 61010-1:2010 for electrical safety and meets EMC requirements per EN 61326-1:2013. While not certified for medical device use, its operational logging capabilities—including timestamped temperature/speed records and alarm event flags—support alignment with FDA 21 CFR Part 11 when paired with validated third-party data acquisition software. It is routinely deployed in academic labs, CROs, and QC facilities performing ASTM D2570 (oxygen transfer rate validation) and USP <797> environmental monitoring workflows.

Software & Data Management

The embedded controller does not include native PC connectivity; however, optional RS-485 or USB-to-serial adapters enable integration with LabVIEW, MATLAB, or custom Python-based DAQ systems for real-time parameter streaming and automated report generation. All operational logs—including start/stop timestamps, temperature excursions >0.5 °C, speed deviations >±2 rpm, and alarm triggers—are stored in non-volatile memory for up to 30 days. Export is supported via SD card (optional module) in CSV format, facilitating audit-ready documentation for ISO 9001, ISO 13485, or GMP-aligned quality systems. Parameter encryption prevents unauthorized changes during multi-user lab environments, and firmware updates are performed via secure bootloader protocol with SHA-256 signature verification.

Applications

• Aerobic bacterial and yeast fermentation studies requiring controlled k_La modulation;
• Protein expression in E. coli BL21(DE3) strains where oxygen limitation triggers inclusion body formation;
• Hybridization kinetics in DNA microarray preparation and Northern blotting protocols;
• Suspension culture of insect cells (Sf9, Sf21) and CHO lines under serum-free conditions;
• Enzyme immobilization assays involving covalent binding to magnetic beads under gentle agitation;
• Environmental microbiology: BOD incubation, nitrification/denitrification rate profiling, and biofilm disruption studies;
• Pharmaceutical QC: dissolution testing support, stability-indicating assay preparation, and reference standard reconstitution homogenization.

FAQ

Is the ZWF-200 suitable for cold room operation?
Yes—the unit operates within ambient temperatures of 5–25 °C and maintains internal setpoints as low as 4 °C using Peltier-assisted cooling combined with insulated chamber walls.
Can amplitude be adjusted continuously, or only in discrete steps?
Amplitude is adjustable in four fixed positions (including Φ40 mm nominal) via mechanical eccentric cam indexing—this design prioritizes mechanical rigidity and positional repeatability over analog fine-tuning.
Does the shaker support external temperature probes for media-specific monitoring?
No native port exists for external PT100 or thermistor inputs; chamber air temperature is the sole regulated variable. Users requiring broth-level feedback must deploy standalone loggers synchronized externally.
What maintenance is required for long-term reliability?
The brushless AC motor requires no scheduled servicing. Annual verification of door seal integrity, fan filter cleaning, and calibration of temperature sensors against NIST-traceable references are recommended.
Is the platform compatible with stackable incubator configurations?
The ZWF-200 is not designed for vertical stacking. Its rear ventilation grilles and top-mounted heat dissipation path necessitate ≥10 cm clearance on all sides for safe thermal management.