BOXUN BMJ-250C Mold Incubator

Overview

The BOXUN BMJ-250C Mold Incubator is a precision-engineered environmental chamber designed specifically for controlled fungal cultivation, microbiological preservation, and long-term stability testing of hygroscopic biological samples. It operates on a dual-parameter control principle—simultaneous regulation of temperature and relative humidity—using independent PID-controlled refrigeration and humidification subsystems. Unlike standard incubators, the BMJ series integrates a high-efficiency centrifugal blower with optimized air duct architecture to ensure laminar, turbulence-free airflow distribution across the entire chamber volume. This forced convection system minimizes thermal stratification and achieves ±1.0°C uniformity at 25°C—a critical performance benchmark for ISO/IEC 17025-accredited microbiology labs conducting mold enumeration per ISO 11133 or USP . The unit complies with IEC 61000-6-3 (EMC) and IEC 61010-1 (Safety), and its non-ozone-depleting R134a refrigerant aligns with EU F-Gas Regulation (EU) No 517/2014.

Key Features

• PMMA II microprocessor controller with intuitive 5.7-inch LCD touchscreen interface, supporting real-time monitoring of temperature, humidity, elapsed time, and alarm status
• Independent dual-loop PID control for temperature (±0.1°C resolution) and humidity (±1% RH resolution), ensuring stable setpoint maintenance under variable load conditions
• Centrifugal fan-driven forced convection system with asymmetric baffle design, delivering uniform air velocity ≥0.3 m/s across all shelf levels
• Mirror-finish 304 stainless steel interior chamber (510 × 450 × 1100 mm) with three adjustable heavy-duty shelves; all surfaces electropolished for ISO Class 5 cleanroom-compatible decontamination
• Dual-glazed inner observation door with anti-fog heating element and silicone-sealed perimeter gasket, maintaining integrity during high-humidity operation
• Integrated mechanical door lock with key override, preventing unauthorized access during BSL-1 or GLP-compliant experiments
• Energy-efficient auto-defrost cycle triggered only by evaporator frost accumulation—not timed—eliminating thermal disturbance during active incubation
• RS-485 serial interface compliant with Modbus RTU protocol, enabling integration into centralized Lab Information Management Systems (LIMS) or SCADA networks

Sample Compatibility & Compliance

The BMJ-250C supports a wide range of biological containment formats including Petri dishes (90 mm and 150 mm), slant tubes, multi-well plates, and sterile bioreactor flasks. Its sealed chamber design meets ASTM D3273–22 requirements for resistance to fungal growth on building materials, and its humidity stability enables compliance with WHO TRS 992 Annex 5 (Good Manufacturing Practice for Sterile Products) for environmental monitoring in pharmaceutical cleanrooms. All internal wetted components—including the fin-type humidifier and water reservoir—are constructed from corrosion-resistant 316 stainless steel and FDA-listed food-grade polymers. The unit undergoes factory calibration traceable to NIM (National Institute of Metrology, China) standards, with optional IQ/OQ documentation packages available for GMP-regulated environments.

Software & Data Management

While the BMJ-250C operates autonomously via its embedded PMMA II controller, it supports external data logging through RS-485 using third-party software platforms compatible with Modbus RTU (e.g., LabVIEW, Ignition SCADA, or custom Python-based acquisition tools). The controller retains up to 30 programmable profiles (each with 99 ramp/soak segments), with automatic timestamping of all parameter changes and alarm events. In the event of power interruption, non-volatile memory preserves all active settings and runtime counters—enabling seamless resumption post-recovery without manual reconfiguration. Audit trail functionality includes date/time-stamped records of setpoint modifications, door openings, and alarm triggers—supporting compliance with FDA 21 CFR Part 11 when paired with validated electronic signature workflows.

Applications

This incubator serves as a primary platform for mycological research, environmental monitoring, and quality control in regulated industries. Typical use cases include: Aspergillus niger and Penicillium chrysogenum strain maintenance per CLSI M38-A3; accelerated stability testing of moisture-sensitive APIs per ICH Q1A(R2); BOD₅ incubation for wastewater analysis (APHA Standard Methods 5210B); fungal spore germination assays under defined hygrometric conditions; and long-term storage of fungal cultures prior to lyophilization. Its extended low-temperature capability (down to 4°C) also permits use as a chilled holding chamber for pre-incubation sample equilibration in ISO 13843-compliant analytical microbiology workflows.

FAQ

What is the maximum allowable ambient operating temperature for continuous humidity control?
The BMJ-250C maintains specified humidity performance only when installed in environments ≤30°C and ≤70% RH ambient. Higher ambient conditions may impair dehumidification capacity and extend recovery time after door opening.
Can the unit operate without humidity control while maintaining full temperature range?
Yes—the refrigeration system remains fully functional across 4–60°C when humidity control is disabled via the controller menu.
Is the water reservoir accessible without opening the main chamber door?
Yes—a dedicated external fill port with level indicator and quick-release cap allows refilling while preserving internal environmental integrity.
Does the RS-485 interface support remote setpoint adjustment?
Yes—Modbus function codes 06 (preset single register) and 16 (preset multiple registers) enable full read/write access to temperature/humidity setpoints, profile selection, and alarm thresholds.
What validation documentation is supplied with the instrument?
Each unit ships with a Factory Calibration Certificate (traceable to NIM), Electrical Safety Test Report, and CE Declaration of Conformity. IQ/OQ protocols and installation qualification templates are available upon request for regulated laboratories.