MJ-II Series Digital LCD Environmental Chamber with Humidification and UV Sterilization (Model MJ-150-II / MJ-250-II / MJ-300-II)

Overview

The MJ-II Series Digital LCD Environmental Chamber is a precision-controlled, microprocessor-driven incubation system engineered for reliable long-term cultivation of fungi, bacteria, yeasts, and other sensitive microorganisms under strictly regulated temperature and humidity conditions. Designed in accordance with ISO 14644-1 cleanroom air classification principles and aligned with GLP-compliant laboratory workflows, this chamber employs a dual-mode control architecture: PID-based thermal regulation combined with a dedicated microcomputer-controlled humidification subsystem. Its core operational principle relies on forced-air convection via a JAKEL centrifugal circulation fan and an optimized internal airflow path—ensuring uniform temperature distribution (±0.5 °C at high setpoints) and stable relative humidity maintenance (60–85 %RH, ±5 %RH deviation). The system utilizes R134a and R406a zero-ozone-depletion refrigerants, complying with Montreal Protocol requirements and EU F-Gas Regulation (EU No 517/2014), making it suitable for environmentally conscious laboratories operating under ISO 14001 frameworks.

Key Features

• Large-backlit LCD display with intuitive menu-driven interface — supports simultaneous real-time monitoring of temperature, humidity, elapsed time, and setpoint values.
• Polished mirror-finish stainless-steel interior chamber with radius-rounded corners (R ≥ 25 mm) for enhanced cleanability and reduced microbial adhesion; adjustable shelf spacing (standard: 3 removable shelves).
• Eco-conscious refrigeration system using R134a/R406a blends — energy-efficient, low-GWP, and fully compliant with international environmental safety standards.
• Dual independent safety systems: (1) Over-temperature cut-off with audible/visual alarm; (2) UV-C germicidal lamp (254 nm) mounted in the ceiling plenum to continuously decontaminate recirculated air — validated per ISO 15714 for airborne bioburden reduction.
• PID temperature control algorithm with 0.1 °C resolution and programmable timer (1–9999 minutes); optional multi-segment controller supports up to 15 segments and 30 steps (each step: 1–99 h 59 min).
• Standard 25 mm or optional 50 mm access port on left side wall — facilitates integration with external sensors, data loggers, or gas supply lines without compromising chamber integrity.
• High-efficiency air circulation system featuring a JAKEL-brand axial-flow fan and proprietary duct geometry — achieves ≤±1.0 °C uniformity across full working volume (per ASTM E145-22 Annex A4 test protocol).

Sample Compatibility & Compliance

The MJ-II series accommodates standard microbiological culture formats including Petri dishes (up to 150 mm diameter), test tubes, flasks, and multi-well plates. Its humidity control capability makes it especially suited for mycological studies requiring sustained hygroscopic environments — such as Aspergillus, Penicillium, and Candida strain propagation, spore germination assays, and fungal metabolite production. All models meet IEC 61010-1:2010 safety requirements for laboratory equipment and are CE-marked. Humidity calibration traceability follows ISO/IEC 17025 guidelines when performed by accredited service providers. The chamber’s construction materials comply with USP for extractables and leachables in pharmaceutical-grade applications.

Software & Data Management

Optional RS485 or USB communication interfaces enable seamless integration with LIMS or SCADA platforms. When equipped with the data logging module, the system records timestamped temperature/humidity values at user-defined intervals (1–60 min), stores up to 30 days of local history, and exports CSV-formatted files compatible with Excel, MATLAB, or statistical process control (SPC) software. Audit trail functionality — including operator ID, parameter changes, alarm events, and calibration logs — satisfies FDA 21 CFR Part 11 requirements when paired with validated electronic signature modules. Firmware updates are delivered via secure HTTPS endpoint and require cryptographic authentication.

Applications

• BOD₅ and COD testing in environmental water analysis (per APHA Standard Methods 5210B and 5220D)
• Fungal preservation and subculturing in clinical microbiology labs (CLSI M38-A3)
• Plant tissue culture and seed germination studies under controlled hygrometric conditions
• Stability testing of biological reagents and diagnostic kits per ICH Q1A(R2)
• Pharmaceutical QC for microbial limit tests (USP and ) and media fill simulations
• Aquaculture research involving marine fungal pathogens and probiotic screening

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The unit is rated for ambient temperatures between 10–30 °C; operation above 30 °C may reduce compressor efficiency and compromise humidity stability.
Is the UV lamp automatically interlocked with the door switch?
Yes — the UV-C irradiation circuit is physically disabled when the chamber door is opened, meeting IEC 62471 photobiological safety Class 1 requirements.
Can the MJ-II series be used for anaerobic culture?
No — this model does not support gas atmosphere modification; for anaerobic applications, consider complementary nitrogen-purge accessories or dedicated anaerobic chambers.
How often should the humidification reservoir be cleaned?
We recommend weekly cleaning with distilled water and monthly disinfection using 70 % ethanol to prevent biofilm formation in the water tank and ultrasonic nebulizer assembly.
Does the system support remote monitoring via Ethernet or Wi-Fi?
Ethernet/Wi-Fi connectivity is not built-in but can be added via third-party industrial IoT gateways compatible with Modbus RTU over RS485.