Yiheng MJ Series Mold Incubator (CFC-Free Refrigeration)

Overview

The Yiheng MJ Series Mold Incubator is a purpose-engineered environmental chamber designed for reliable, long-term cultivation and maintenance of filamentous fungi, yeasts, and other humidity-sensitive microorganisms under precisely controlled temperature and relative humidity conditions. Unlike general-purpose incubators, the MJ Series incorporates dedicated thermal and hygric management systems optimized for mycological applications—where stable moisture retention and minimal thermal gradient across the chamber volume are critical for spore germination, hyphal growth kinetics, and colony morphology consistency. The unit operates on a CFC-free refrigeration cycle using an energy-efficient, branded hermetic compressor, enabling precise sub-ambient cooling down to 0 °C while maintaining low power consumption and extended service life. Its natural convection architecture eliminates forced airflow that may desiccate agar surfaces or disrupt delicate fungal structures—a key design consideration validated by ISO 8573-1 clean air guidelines for non-turbulent biological environments.

Key Features

• Mirror-finish stainless steel interior with fully rounded corners and adjustable shelving—compliant with ISO 14644-1 Class 8 surface hygiene requirements for easy decontamination and residue-free cleaning.
• Integrated polyurethane foam insulation applied via one-shot foaming process, achieving >25% improvement in thermal resistance (R-value) versus conventional panel-laminated designs—verified per ASTM C518 steady-state heat flux testing.
• Microprocessor-based PID temperature controller with real-time deviation compensation, offering programmable ramp-hold profiles and user-defined timer functions (up to 999 hours).
• Three-stage manual fan speed selector—enabling fine-tuned ambient air exchange without inducing evaporative stress on Petri dishes or slant cultures.
• Dual-limit safety system: independent mechanical high-temperature cutoff (adjustable up to 65 °C) plus electronic over-temperature alarm with automatic power cutoff—meeting IEC 61010-1 Clause 6.3.2 for laboratory equipment protection.
• Optional RS485 serial interface (Modbus RTU protocol) and thermal printer port support audit-ready data logging compliant with FDA 21 CFR Part 11 Annex 11 requirements when paired with validated third-party software.

Sample Compatibility & Compliance

The MJ Series accommodates standard microbiological consumables including 90 mm and 150 mm Petri dishes, test tubes (13×100 mm, 16×150 mm), slants, and multi-well plates. Its humidity control system maintains stable 60–85 % RH across the full operating temperature range without condensation formation—validated per USP for microbial growth chamber qualification. Chamber uniformity (±1.5–2.5 °C at 25 °C) satisfies ISO/IEC 17025 clause 5.4.2 for accredited calibration laboratories performing BOD₅, mold enumeration (ISO 21527-1), and antibiotic susceptibility testing (CLSI M38-A3). All electrical components conform to CE marking directives (2014/30/EU EMC, 2014/35/EU LVD) and RoHS 2011/65/EU material restrictions.

Software & Data Management

While the base configuration features a menu-driven LCD interface with intuitive icon-based navigation, optional connectivity modules enable integration into centralized lab informatics infrastructure. The RS485 port supports bi-directional communication with LIMS platforms for automated parameter upload/download and event-triggered data capture (e.g., door-open alerts, temperature excursions). When used with Yiheng’s optional data logger firmware (v3.2+), the system generates timestamped CSV files containing minute-interval temperature/humidity readings, complete with digital signatures and change history—fully traceable for GLP/GMP audits. Raw logs meet ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) as defined in WHO TRS 996 Annex 6.

Applications

• Standardized cultivation of Aspergillus niger, Penicillium chrysogenum, and Trichoderma reesei per ISO 11133:2014 Annex D protocols.
• Biochemical Oxygen Demand (BOD₅) analysis in wastewater treatment facilities following APHA Standard Methods 5210B.
• Pharmaceutical stability testing of excipients and final dosage forms under ICH Q1A(R2) intermediate storage conditions (25 °C/60 % RH).
• Agricultural seed-borne pathogen isolation (e.g., Fusarium graminearum) using modified potato dextrose agar (PDA) media per ISTA Rules Section 5.4.2.
• Validation of sterilization cycle residuals in medical device packaging per ISO 11137-1:2018 Annex C.

FAQ

Does the MJ Series support continuous temperature/humidity logging?
Yes—when equipped with the optional RS485 module and compatible software, it records parameters at user-selectable intervals (1 min to 24 h) with embedded clock synchronization and tamper-evident file encryption.
Is calibration certificate included with shipment?
A factory-as-tested calibration report (traceable to NIM China) is provided; UKAS or DAkkS-accredited certificates are available upon request with additional lead time.
Can the unit operate at 4 °C with 85 % RH simultaneously?
Yes—the refrigeration and humidification subsystems are decoupled and independently regulated, enabling stable operation across the full cross-parameter envelope without dew-point conflict.
What maintenance intervals are recommended?
Compressor oil inspection every 24 months; condenser coil cleaning quarterly; humidity sensor verification semiannually using saturated salt solutions per ISO 4882-2.
Are custom internal dimensions available?
Standard models follow fixed cavity geometries; however, OEM configurations with modified internal volume or shelf layout can be engineered under Yiheng’s Industrial Partnership Program (IPP).