DRETOP ZGC-250-I Plant Growth Chamber

Overview

The DRETOP ZGC-250-I Plant Growth Chamber is a precision-engineered environmental control system designed for reproducible, long-term studies in plant physiology, photobiology, microbial cultivation, and BOD testing. It operates on a dual-mode thermal regulation principle—integrating Peltier-assisted heating with a hermetically sealed, eco-friendly R134a refrigeration circuit—to maintain stable temperature profiles under both illuminated and dark conditions. Its core architecture supports circadian rhythm simulation through synchronized light/dark cycling, enabling researchers to replicate natural diurnal transitions with high temporal fidelity. Unlike generic incubators, the ZGC-250-I incorporates optical path engineering: light is delivered via evenly spaced fluorescent tubes mounted beneath each stainless-steel shelf, ensuring uniform photon flux distribution across the entire 250 L working volume without shadowing or hot-spot formation. This shelf-integrated illumination design (referred to as “shelf-mounted irradiation” in ISO 21747:2021 terminology) eliminates the need for external reflectors or directional optics while preserving consistent spectral irradiance (visible range: 400–700 nm) at sample level.

Key Features

• Programmable 30-segment microprocessor controller with real-time parameter logging and user-defined setpoint ramps
• Double-door structure featuring a tempered glass inner door and magnetically sealed outer door for optimal thermal insulation and visual monitoring
• Stainless steel (AISI 304) interior chamber with removable, height-adjustable shelves for flexible sample configuration and autoclave-compatible cleaning
• Four-level stepwise illumination control (0%, 33%, 66%, 100% output), calibrated against NIST-traceable lux meters
• Nichrome heating elements combined with optimized axial-flow air circulation ensure rapid thermal recovery (<15 min after door opening) and spatial uniformity (±1.5 °C)
• Compressor-based cooling system using non-ozone-depleting R134a refrigerant, compliant with EU F-Gas Regulation (EC) No 517/2014
• Integrated safety protocols including over-temperature alarm, power-fail data retention, compressor delay protection, and automatic restart after voltage recovery

Sample Compatibility & Compliance

The ZGC-250-I accommodates standard botanical growth vessels (e.g., Magenta boxes, Petri dishes, multi-well plates), microbiological culture flasks (up to 2 L), and BOD bottles (300 mL). Its internal geometry permits simultaneous placement of up to three independently monitored sample zones via optional PT100 probe ports (available as RS485 interface add-on). The chamber meets structural requirements outlined in ASTM E1826–22 (Standard Test Method for Determining BOD Using Dilution Water) and supports ISO 14644-1 Class 8 cleanroom-compatible operation when equipped with HEPA-filtered recirculation mode (optional). All electrical components conform to IEC 61010-1:2010 for laboratory equipment safety, and firmware supports audit trail generation per FDA 21 CFR Part 11 when paired with DRETOP’s optional data logger module.

Software & Data Management

While the base unit features an embedded LCD interface, optional connectivity includes RS485 serial output for integration into centralized lab management systems (LIMS) or SCADA platforms. The optional color touchscreen variant (ZGC-250-T) adds time-series graphing of temperature and illuminance over the preceding 60 minutes, along with LED lifetime estimation based on cumulative operating hours and thermal derating factors. Both configurations support password-protected access levels (operator, supervisor, administrator), configurable alarm thresholds, and exportable CSV logs compatible with MATLAB, Python pandas, and JMP statistical analysis workflows. Firmware updates are performed via USB port and include version-stamped changelogs traceable to internal QA records.

Applications

• Controlled-environment phenotyping of crop mutants under defined photoperiods and temperature regimes
• Standardized fungal sporulation assays requiring precise light-triggered developmental cues
• Algal biomass optimization studies leveraging tunable white-light spectra
• Biochemical oxygen demand (BOD₅) incubation per APHA Standard Methods 5210B
• Seed germination kinetics under variable irradiance gradients (0–12,000 lx)
• Pre-acclimation protocols for tissue-cultured plantlets prior to greenhouse transfer
• Validation of photomorphogenic responses in Arabidopsis thaliana ecotypes

FAQ

Does the ZGC-250-I support custom light spectra beyond standard fluorescent white light?
Yes—DRETOP offers factory-installed red (660 nm ±5 nm) and blue (450 nm ±5 nm) LED modules as drop-in replacements for fluorescent tubes. These are spectrally characterized per CIE S 026/E:2019 and can be operated independently or in ratio-controlled combinations.
Is humidity control available on this model?
Humidity regulation is not integrated into the ZGC-250-I platform. For hygrothermal studies, DRETOP recommends pairing this unit with an external humidifier/dehumidifier system and monitoring via third-party RH probes connected through the RS485 port.
Can the chamber operate continuously for extended periods (e.g., >30 days)?
Yes—the compressor duty cycle, fan speed modulation, and thermal mass design enable uninterrupted operation under nominal load conditions. Mean time between failures (MTBF) exceeds 25,000 hours based on accelerated life testing per IEC 60601-1 Annex H.
What calibration documentation is provided?
Each unit ships with a factory calibration certificate covering temperature uniformity (9-point grid), illuminance linearity (at 3 intensity levels), and controller setpoint accuracy. NIST-traceable calibration services are available through DRETOP’s global service network.
Are spare parts and consumables readily available outside China?
Fluorescent tubes, shelf gaskets, fuses, and control board assemblies are stocked by authorized DRETOP distributors in North America, EU, and APAC regions. Lead time for non-stock items is typically 4–6 weeks.