Yoyi RQH-150 Programmable Climate Chamber for Plant Growth and Microbial Culture

Overview

The Yoyi RQH-150 Programmable Climate Chamber is an integrated environmental simulation system engineered for precise, long-term control of temperature, relative humidity, and photoperiodic illumination. It operates on a dual-mode thermal management principle—leveraging Peltier-free resistive heating combined with passive cooling and active humidity regulation via an internal water reservoir and immersion-type heating element. Its triple-side illumination architecture ensures uniform photosynthetic photon flux distribution across the entire working chamber, while the double-glazed observation door minimizes thermal leakage during visual monitoring. Designed for uninterrupted operation exceeding 360 hours under standard ambient conditions (20 °C, 50 %RH), the RQH-150 meets the stability and reproducibility requirements of controlled-environment biology protocols—including seed germination assays, microbial growth kinetics, insect rearing, BOD incubation, and plant phenotyping studies.

Key Features

• Microprocessor-driven PID control system with intuitive graphical LCD interface supporting multi-parameter real-time display and menu-guided navigation
• Triple-directional LED or fluorescent lamp mounting configuration enabling homogeneous irradiance distribution (0–12,000 lx, six-step intensity adjustment)
• Double-sealed glass door structure with insulating air gap, preserving internal thermal integrity during observation
• High-efficiency centrifugal circulation fan paired with aerodynamically optimized internal ductwork to maintain ±1 °C temperature uniformity throughout the 150 L chamber volume
• Adjustable stainless-steel shelving system (3 tiers, height-dimensionally configurable) compatible with standard Petri dishes, culture flasks, and multi-well plates
• Robust mechanical construction: cold-rolled steel housing with epoxy-coated finish and electropolished 304 stainless-steel interior chamber resistant to corrosion and biofilm accumulation
• Integrated mobility solution featuring four directional swivel casters with individual mechanical locks for secure positioning and relocation
• Programmable logic controller supporting up to 99 independent cycles, each comprising 30 programmable segments with time resolution down to 1 minute

Sample Compatibility & Compliance

The RQH-150 accommodates a broad range of biological and environmental samples—from fungal spore suspensions and bacterial broth cultures to intact seed batches, juvenile arthropods, and aquatic microcosms. Its humidity control system (40–95 %RH, ±5–7 %RH deviation under no-load calibration) enables reliable emulation of tropical, temperate, and semi-arid climatic profiles. While not certified to IEC 61000-4 electromagnetic compatibility standards or ISO 14644 cleanroom classifications, the unit’s stable thermal-hygrometric performance supports adherence to method-defined environmental controls referenced in ASTM E1826 (BOD incubation), ISO 20785 (microbial culture), and OECD 208 (terrestrial plant toxicity testing). Its operational envelope (ambient 5–30 °C) aligns with GLP facility infrastructure guidelines for ancillary equipment placement.

Software & Data Management

The embedded firmware implements non-volatile memory storage for all user-defined programs and runtime logs. Data points—including chamber temperature, setpoint deviation, humidity status, lighting stage, and elapsed cycle time—are timestamped and retained onboard for post-run retrieval via front-panel navigation. Though the RQH-150 does not feature USB/Ethernet connectivity or remote cloud synchronization, its event-driven logging architecture supports manual audit trail reconstruction required under basic GLP documentation practices. All parameter changes are recorded with date/time stamps, and the system enforces password-protected access to critical configuration menus to prevent unauthorized modifications—a foundational requirement for regulated laboratory environments operating under FDA 21 CFR Part 11-aligned procedural controls.

Applications

• Seed viability and germination rate assessment under standardized light/dark cycling regimes per ISTA protocols
• Controlled-stress acclimation studies in crop physiology (e.g., drought, heat, or photoperiod manipulation)
• Long-duration microbial culture maintenance for strain preservation and metabolic profiling
• Biochemical oxygen demand (BOD₅) incubation at 20 °C ±0.5 °C per APHA Standard Methods 5210B
• Insect developmental staging under species-specific photoperiod and thermohygrometric conditions
• Preclinical evaluation of botanical extract stability under accelerated aging conditions (ICH Q1A)
• Algal biomass production optimization using tunable PAR (Photosynthetically Active Radiation) spectra

FAQ

What is the maximum continuous runtime supported by the RQH-150?
The chamber is validated for uninterrupted operation exceeding 360 hours under nominal ambient conditions (20 °C, 50 %RH) with no load.
Can the illumination spectrum be customized beyond intensity adjustment?
The base configuration supports only intensity modulation (six discrete levels); spectral tuning requires external lamp replacement with manufacturer-specified LED arrays.
Is humidity control active during the dark phase?
Yes—humidity regulation remains fully functional independent of lighting state, enabling decoupled control of hygric and photic variables.
Does the unit include validation documentation for IQ/OQ protocols?
Factory calibration certificates are provided; full installation and operational qualification kits must be developed in-house or commissioned from third-party metrology providers.
How is temperature uniformity verified inside the working chamber?
Uniformity is characterized using nine-point NIST-traceable probe mapping per ISO 16730:2017 Annex C methodology during factory acceptance testing.