DRETOP ZAI-350 Series Anaerobic Incubator

Overview

The DRETOP ZAI-350 Series Anaerobic Incubator is a manually operated, chamber-type controlled-atmosphere incubation system engineered for reliable cultivation and manipulation of obligate anaerobes, microaerophiles, and hypoxia-sensitive biological samples. It operates on the principle of sequential vacuum evacuation and precision gas replacement—enabling reproducible establishment and maintenance of defined low-oxygen or strictly anaerobic environments (O₂ ≤1%) within its sealed sample chamber. Unlike automated glove-box systems requiring continuous gas flow or complex catalytic regeneration, the ZAI-350 employs a deterministic gas conditioning protocol combining micro-flow regulation, high-purity nitrogen (99.99%), and a standardized 85% N₂ / 5% H₂ / 10% CO₂ mixture to rapidly achieve target atmospheres. Its thermal architecture utilizes PID-controlled heating with linear compensation algorithms and dual-point uniformity validation, ensuring stable temperature distribution across the full 33.6 L working volume (400 × 300 × 280 mm). Designed for ISO Class 5–7 cleanroom-adjacent workflows, it supports both microbiological culture (e.g., Clostridium perfringens, Porphyromonas gingivalis, Campylobacter jejuni) and materials science applications demanding inert, moisture-controlled, hydrocarbon-free environments—including battery electrode drying, OLED encapsulation pre-treatment, and MOCVD substrate handling.

Key Features

• Microprocessor-based PID temperature controller with real-time deviation correction and ±0.5°C stability (±1.0°C uniformity across chamber)
• Manual gas management interface with tactile electromagnetic valve controls for independent N₂ and mixed-gas flow adjustment
• Integrated oil-free piston vacuum pump—eliminates hydrocarbon contamination and eliminates routine lubricant maintenance
• 304 stainless steel interior and glove port housing with electropolished finish for corrosion resistance and ISO-compliant cleanability
• 12 mm tempered front viewing window offering >92% visible-light transmittance and impact-resistant integrity
• UV-C sterilization lamp (254 nm) mounted internally for periodic decontamination between cycles
• Touchscreen interface (ZAI-350 Plus variant) with pressure-compensated O₂ concentration display and data partitioning for operational transparency
• Over-temperature cut-off with dual-mode alarm (audible buzzer + visual LED indicator) compliant with IEC 61010-1 safety requirements
• Power failure memory function retaining user-defined setpoints and active protocols upon resumption of supply
• Ergonomic long-reach gloves with reinforced wrist seals and integrated LED task lighting for extended manipulation sessions

Sample Compatibility & Compliance

The ZAI-350 accommodates standard Petri dishes (up to 150 mm), multi-well plates, anaerobic jars, and custom-sized substrates up to 380 mm in width. Its chamber geometry and gas dynamics support consistent O₂ depletion kinetics across heterogeneous sample loads—validated per ASTM E2654-21 (Standard Practice for Verification of Anaerobic Conditions). The system meets core functional requirements for CLIA, CAP, and ISO 15189-accredited clinical microbiology laboratories when deployed with optional ABC kits (anaerobic indicator strips, desiccant silica gel, and certified gloves). While not inherently 21 CFR Part 11 compliant (lacking electronic signature and audit trail functionality), its manual operation mode aligns with GLP Annex 11 principles for non-automated environmental control devices. All gas pathways are constructed from electropolished 316L SS tubing with VCR fittings; inlet gases must be filtered to ≤0.01 µm (HEPA + coalescing) prior to entry.

Software & Data Management

The base ZAI-350 model operates via embedded firmware without external software dependency. Temperature setpoints, gas cycle timing, and vacuum hold durations are configured directly through the front-panel interface. The ZAI-350 Plus variant includes a 7-inch capacitive touchscreen running a deterministic real-time OS that logs timestamped chamber temperature, ambient pressure, and estimated O₂ decay curves (derived from cycle count and gas composition). Data export is limited to USB-stick CSV dumps—no cloud connectivity or remote access capability is implemented. For regulated environments requiring traceability, users may integrate external validated data loggers (e.g., DeltaTRAK FlashLink or Omega OM-DAQPRO) connected to the unit’s analog output terminals (0–5 V DC proportional to chamber temperature).

Applications

• Clinical microbiology: Isolation and subculture of fastidious anaerobes including Shigella spp., Bifidobacterium, and Actinomyces israelii
• Gut microbiome research: Facilitation of strict anaerobe enrichment under physiologically relevant O₂ gradients (1–5% O₂ for microaerophiles)
• Cellular hypoxia modeling: Controlled low-oxygen exposure of stem cells, tumor spheroids, or primary neuronal cultures
• Materials processing: Solvent-free drying of Li-ion cathode slurries, passivation of perovskite precursors, and pre-annealing of flexible OLED substrates
• Industrial quality control: Microbial challenge testing of packaging barrier films under simulated shelf-life conditions
• Biotechnology: Anaerobic fermentation starter culture activation and viability assessment

FAQ

What gas mixtures are supported for anaerobic conditioning?
The system accepts high-purity nitrogen (99.99%) and premixed gases containing 85% N₂ / 5% H₂ / 10% CO₂. Custom blends require third-party certification for compatibility with the internal stainless-steel gas manifold.
Is catalytic oxygen removal integrated or optional?
An optional 500 g palladium-based catalyst cartridge is available as an add-on (part #ZAI-CAT-500) to accelerate O₂ scavenging during initial chamber conditioning.
Can the unit maintain anaerobiosis during power interruption?
Yes—the sealed chamber design and low-leakage gasket system preserve O₂ ≤1% for >12 hours post-gas cutoff; however, temperature control ceases immediately upon power loss.
What validation documentation is provided?
Each unit ships with a Factory Calibration Certificate (temperature uniformity, vacuum rate, O₂ sensor baseline) traceable to NIM (National Institute of Metrology, China) standards.
Are glove ports compatible with standard ISO 10993-certified gloves?
Yes—the flanged 120 mm diameter ports accept industry-standard butyl, neoprene, or laminated gloves with ISO 10993-5/10 biocompatibility ratings.