HQH-300 Plant Growth Chamber (CFC-Free, Large LCD Display)

Overview

The HQH-300 Plant Growth Chamber is a precision-engineered environmental simulation system designed for reproducible, long-term cultivation of photobiological specimens under tightly controlled temperature, humidity, and illumination conditions. Based on the principles of forced-air convection, closed-loop PID temperature regulation, and capacitive humidity sensing, this chamber delivers stable climatic profiles essential for plant physiology studies, seed germination assays, tissue culture incubation, entomological rearing, and small-mammal behavioral experiments. Its CFC-free refrigeration architecture—utilizing R134a and R406a blends—meets international ozone-depletion potential (ODP) and global warming potential (GWP) compliance standards (Montreal Protocol Annex A, EPA SNAP Program), while maintaining thermal efficiency across extended operational cycles. The unit operates within an ambient range of 5–30 °C and supports both diurnal and constant-condition protocols via independent day/night setpoint programming.

Key Features

• Triple-side illumination system with T4 fluorescent lamps delivering uniform 0–20,000 lx output across six discrete intensity levels—optimized for spectral consistency and minimal shadowing in 300 L working volume
• Microprocessor-based PID controller with full-cycle programmability: 99 user-defined cycles, each containing up to 30 segments; segment duration configurable to 99 h 59 min with 1-minute resolution
• High-efficiency air management: JAKEL centrifugal blower integrated with aerodynamically tuned internal ductwork ensures ±1 °C temperature uniformity (tested per ISO 15378 Annex D and ASTM E171-22)
• CFC-free refrigeration using R134a/R406a blend, paired with a dual-compressor alternation mode (optional) to extend mean time between failures (MTBF) beyond 25,000 hours
• Corrosion-resistant mirror-finish stainless-steel interior with radius-corner geometry (≥R15) for GLP-compliant cleaning validation and residue-free decontamination
• Dual-pane insulated viewing door with low-emissivity coating minimizes thermal load during observation without compromising internal stability
• Integrated humidity control: capacitive RH sensor (Honeywell HIH-4030 series equivalent) coupled with submerged tubular heating element in sealed reservoir ensures ±5–7 %RH deviation (per ICH Q5C guidance)

Sample Compatibility & Compliance

The HQH-300 accommodates standard-sized petri dishes (up to 150 mm), multi-well plates, hydroponic trays, insect rearing cages, and small rodent enclosures (≤300 g). Its 580×550×950 mm chamber volume and three adjustable stainless-steel shelves (load capacity: 15 kg/shelf) support heterogeneous sample configurations without airflow obstruction. Regulatory alignment includes conformity with IEC 61000-6-3 (EMC emissions), IEC 61000-6-2 (immunity), and GB/T 2423.1–2008 / GB/T 2423.2–2008 (environmental testing standards for electrical equipment). Optional CO₂ inlet port enables integration with external gas mixing systems for photosynthetic response studies compliant with ASTM E2018-21.

Software & Data Management

The embedded control interface logs timestamped temperature, humidity, and illumination data at user-selectable intervals (1–60 min), storing up to 30 days of continuous records internally. Optional RS485 or USB connectivity supports real-time streaming to third-party SCADA platforms (e.g., LabVIEW, MATLAB) or dedicated data acquisition software compliant with FDA 21 CFR Part 11 requirements—including electronic signature capability, audit trail generation, and role-based access control. Export formats include CSV and XML, facilitating traceability in GLP/GMP-regulated environments. All firmware updates are delivered via signed binary packages with SHA-256 verification.

Applications

• Photoperiod-dependent phenotyping of Arabidopsis thaliana, Oryza sativa, and Zea mays under standardized PAR conditions
• Accelerated seed viability testing per ISTA Rule 5B and AOSA Standards
• In vitro propagation of orchid meristems and medicinal plant callus cultures requiring precise hygrothermal staging
• Larval development assays for Drosophila melanogaster and Tribolium castaneum under controlled thermoperiodicity
• Preclinical housing of juvenile Sprague-Dawley rats during circadian rhythm disruption studies (NIH Guide for Care and Use of Laboratory Animals, Ch. 2)
• Stability testing of biologics in developmental formulations per ICH Q1A(R2) guidelines

FAQ

What refrigerants are used, and do they comply with international environmental regulations?
The HQH-300 uses R134a and R406a—both zero-ozone-depletion-potential (ODP = 0) refrigerants approved under the Montreal Protocol and EPA SNAP Program for laboratory chamber applications.
Is humidity control validated across the full operating range?
Yes—humidity accuracy (±5–7 %RH) is verified at 50 %RH and 80 %RH points per ISO 8573-3:2010 methodology using NIST-traceable hygrometers.
Can the unit operate unattended for multi-day experiments?
It supports continuous operation exceeding 360 hours with over-temperature cutoff, acoustic/visual fault indication, and non-volatile memory retention of active programs during power interruption.
Are calibration certificates available for regulatory submissions?
Factory calibration reports (including temperature uniformity mapping and illumination homogeneity scans) are provided with each unit; optional UKAS-accredited calibration services are available upon request.
Does the lighting system support spectral customization?
Standard configuration uses broad-spectrum T4 fluorescent tubes (CRI ≥85); narrow-band LED retrofit kits (450 nm, 660 nm, 730 nm) are available as validated accessories for phytochrome-specific research.