English Product Name
| Origin | Beijing, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | GXH-3051C |
| Pricing | Available Upon Request |
| CO₂ Resolution | 0.1 ppm |
| CO₂ Range | 0–1000 ppm |
| CO₂ Accuracy | ±1% F.S. |
| Relative Humidity Resolution | 0.1% RH |
| RH Range | 0–100% RH |
| RH Accuracy | ±2% F.S. |
| Temperature Resolution | 0.1 °C |
| Temp Range | 0–50 °C |
| Temp Accuracy | ±0.2 °C |
| Photosynthetic Photon Flux Density (PPFD) Resolution | 1 µmol·m⁻²·s⁻¹ |
| PPFD Range | 0–3000 µmol·m⁻²·s⁻¹ |
| PPFD Accuracy | ±10 µmol·m⁻²·s⁻¹ |
| Battery | 6 V, 4 Ah Ni-MH |
| Continuous Operation Time | ≥2 h (instrument), ≥3 h (laptop) |
| Charging | 220 V AC, 12 h full charge |
| Airline Length | 1.2 m |
| Net Weight | 2.5 kg |
Overview
The GXH-3051C Portable Photosynthesis and Gas Exchange System is a field-deployable, open/closed-path instrument engineered for quantitative measurement of net photosynthetic rate (An), stomatal conductance (gs), transpiration rate (E), intercellular CO₂ concentration (Ci), water use efficiency (WUE), and leaf-level gas exchange parameters in real time. Based on non-dispersive infrared (NDIR) spectroscopy for CO₂ detection, the system integrates high-stability NDIR sensors with precision thermistors, capacitive humidity sensors, and calibrated quantum sensors to simultaneously monitor leaf chamber temperature, ambient and leaf surface temperature, relative humidity, and photosynthetically active radiation (PAR). Its dual-path architecture supports both open-system (flow-through) and closed-system (recirculating) configurations, enabling rigorous control over boundary layer conductance and environmental perturbation—critical for reproducible physiological assessments under controlled or semi-field conditions.
Key Features
- Integrated portable platform combining a ruggedized laptop computer, NDIR-based CO₂ analyzer, multi-sensor leaf chamber, and embedded data acquisition firmware—eliminating external DAQ hardware and minimizing setup complexity.
- Real-time sampling at ≤1 Hz frequency with synchronized timestamping across all sensor channels (CO₂, H₂O, Tleaf, Tair, RH, PPFD), ensuring temporal coherence for kinetic analysis of light-response curves or diurnal gas exchange patterns.
- Modular leaf chamber design with interchangeable gaskets and clamping mechanisms compatible with broadleaf, needle, and succulent morphologies; optional custom chambers available for epiphytic or small-canopy species.
- Field-ready power architecture: 6 V / 4 Ah Ni-MH battery enables ≥2 hours of continuous operation; optional solar panel interface supports extended off-grid deployment in remote ecological sites.
- Intuitive Windows-based software featuring live parameter visualization (e.g., An vs. PPFD, gs vs. VPD), automated calculation of derived metrics (e.g., intrinsic WUE = An/gs, stomatal limitation index), and export-compatible CSV/Excel output compliant with downstream statistical packages (R, Python, GraphPad Prism).
Sample Compatibility & Compliance
The GXH-3051C is validated for use with intact, attached leaves of herbaceous angiosperms, woody dicots, conifers, and C₄ grasses under laboratory, greenhouse, and short-term field conditions (≤4 h exposure per measurement session). Chamber sealing integrity is verified per ISO 17025-aligned internal leak-check protocols prior to each measurement cycle. Data logging meets GLP-compliant metadata tagging requirements—including operator ID, chamber ID, calibration date, ambient barometric pressure (user-input), and sensor-specific serial numbers. While not certified to FDA 21 CFR Part 11, the software supports audit-trail-enabled user accounts and password-protected data export for institutional QA/QC workflows.
Software & Data Management
The proprietary acquisition and analysis suite provides real-time plotting of raw and calculated variables, configurable alarm thresholds (e.g., CO₂ drift >5 ppm/min), and batch processing for repeated-measurement experiments. All datasets include embedded EXIF-style headers documenting firmware version, sensor calibration coefficients, and environmental context. Export formats include UTF-8 CSV (tab-delimited), MATLAB .mat, and standardized Ecophysiology Data Format (EDF) v2.1 schema—facilitating interoperability with global databases such as TRY Plant Trait Database and FluxNet-2015 archives. Local storage utilizes encrypted SQLite databases with automatic daily backup to removable USB media.
Applications
- Photosynthetic acclimation studies under controlled abiotic stress (drought, heat, salinity) in growth chambers and phytotrons.
- In situ assessment of crop cultivar performance across agroecological gradients (e.g., elevation, soil type, irrigation regime).
- Ecophysiological screening of native and invasive species for restoration ecology and climate change impact modeling.
- Validation of leaf-level parameterizations in terrestrial biosphere models (e.g., Farquhar-von Caemmerer-Berry model inputs).
- Teaching laboratories requiring robust, entry-level instrumentation for plant physiology curricula aligned with ASPB and ESA pedagogical standards.
FAQ
What calibration gases are required for routine maintenance?
Zero gas (N₂ or synthetic air) and span gas (350–400 ppm CO₂ in air, trace moisture controlled) are recommended quarterly; factory calibration certificates include NIST-traceable documentation.
Can the system measure dark respiration without modification?
Yes—by selecting “Closed-Path Dark Respiration” mode, the software automatically initiates CO₂ accumulation protocol with integrated IRGA zeroing and thermal stabilization delay.
Is leaf temperature measured via contact or infrared?
Contact thermistor embedded in the chamber gasket provides direct leaf surface temperature; ambient air temperature is measured by a shielded thermistor upstream of the chamber inlet.
Does the software support automated light-curve generation?
Yes—programmable PPFD ramp sequences (e.g., 0 → 2000 µmol·m⁻²·s⁻¹ in 100 µmol increments, 3-min equilibration per step) are fully scriptable within the acquisition interface.
Are firmware updates provided post-purchase?
Free lifetime firmware and software updates are delivered via secure download portal with SHA-256 checksum verification and version-controlled release notes.
