DRETOP ZSH-250 Biochemical Incubator

Overview

The DRETOP ZSH-250 Biochemical Incubator is a precision-engineered, dual-mode (heating and refrigeration) environmental chamber designed for stable, long-term temperature-controlled cultivation and biochemical assays in academic, clinical, and industrial life science laboratories. Built upon the Couette-type forced-air convection principle, it maintains thermodynamic equilibrium across its stainless-steel interior through optimized airflow distribution—ensuring minimal thermal stratification and high spatial reproducibility. Unlike passive or natural-convection incubators, the ZSH-250 employs a digitally regulated axial fan system with laminar-flow ducting to deliver uniform air velocity profiles across all shelf levels. Its operational envelope spans 0–70 °C, making it suitable for both psychrophilic microbial studies and thermophilic enzyme activity assays, as well as standardized protocols such as BOD₅ (Biochemical Oxygen Demand), ASTM D5210, ISO 8192, and USP / microbiological testing. The unit complies with IEC 61010-1 safety standards for laboratory equipment and incorporates design elements aligned with GLP-compliant workflow requirements.

Key Features

• Microprocessor-based P.I.D. temperature controller with 0.1 °C resolution, real-time digital display, and programmable alarm thresholds for over-temperature and sensor-failure conditions.
• Air-jacketed heating system combined with a high-efficiency hermetic compressor (R134a or R600a refrigerant, depending on F-series configuration) ensures rapid thermal response and low energy consumption per degree-hour.
• Forced convection architecture using a corrosion-resistant centrifugal blower and multi-directional internal ducting achieves ±1 °C temperature uniformity (measured at nine points in empty chamber per ISO 15333-2).
• Stainless-steel inner chamber (SUS304) with removable, height-adjustable shelves; rounded internal corners minimize dust accumulation and facilitate autoclave-compatible cleaning and disinfection.
• Dual-door observation window: outer magnetic seal gasket + inner tempered glass panel, reducing heat loss by >35% versus single-glass designs (tested per EN 16892).
• Integrated power management system supports automatic recovery after power interruption, parameter retention for ≥72 hours, and configurable delay-start cycles to protect compressor longevity.

Sample Compatibility & Compliance

The ZSH-250 accommodates standard Petri dishes (up to 150 mm), multi-well plates (6–96-well), Erlenmeyer flasks (up to 2 L), and custom bioreactor vessels via adjustable shelf spacing (max. 120 mm vertical clearance). It supports BOD incubation when equipped with optional IP67-rated BOD sockets (IEC 60529 compliant), enabling simultaneous operation of dissolved oxygen meters and stirrers inside the chamber. All electrical components meet CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). The incubator’s temperature validation protocol aligns with IQ/OQ documentation templates recommended by ISO/IEC 17025-accredited calibration labs.

Software & Data Management

While the base model operates via standalone front-panel interface, optional RS485 serial communication enables integration with LabArchives, LabVantage, or custom SCADA systems using Modbus RTU protocol. An optional thermal printer (IEEE 1188-compliant) provides hard-copy audit trails of setpoints, actual temperatures, and alarm events—supporting 21 CFR Part 11 compliance when paired with user-access controls and electronic signature modules. Firmware updates are delivered via USB port with SHA-256 checksum verification to ensure integrity.

Applications

• Biochemical oxygen demand (BOD) determination per APHA Standard Methods 5210B and ISO 5815-1.
• Microbial growth studies (e.g., E. coli, S. aureus, yeast) under controlled aerobic conditions for QC/QA in pharmaceutical manufacturing.
• Enzyme kinetics assays requiring precise thermal stabilization between 4 °C and 65 °C.
• Seed germination and plant tissue culture in agricultural research facilities.
• Environmental monitoring labs performing coliform enumeration (membrane filtration) and heterotrophic plate count (HPC) analysis.
• Medical device sterilization process validation support (e.g., biological indicator incubation per ISO 11138-1).

FAQ

What is the temperature recovery time after door opening?
Typically ≤12 minutes to re-stabilize within ±0.5 °C at 37 °C following a 30-second door opening (per internal test report ZSH-250-TR-2023-087).
Is the unit suitable for CO₂-independent cell culture?
Yes—it is configured for ambient-air incubation only; CO₂ control requires separate gas mixing and regulation hardware.
Can the incubator be validated for GMP environments?
Yes—its modular construction, traceable calibration ports, and optional data logging accessories support full qualification (IQ/OQ/PQ) per Annex 15 of the EU GMP Guidelines.
Does the ZSH-250 support remote monitoring via Ethernet or Wi-Fi?
Not natively; however, third-party IoT gateways (e.g., Siemens Desigo CC, BACnet/IP bridges) can interface via RS485 with proper protocol mapping.
What maintenance intervals are recommended for the compressor and fan assembly?
Compressor oil inspection every 24 months; fan filter cleaning every 3 months; annual calibration verification using NIST-traceable PT100 probe.