JFQ-3150G Portable Photosynthesis System by Junfang Physical & Chemical
| Brand | Junfang Physical & Chemical |
|---|---|
| Origin | Beijing, China |
| Model | JFQ-3150G |
| Price Range | USD 1,400 – 7,000 |
Overview
The JFQ-3150G Portable Photosynthesis System is an integrated, field-deployable gas exchange measurement platform engineered for quantitative assessment of net photosynthetic rate (An), stomatal conductance (gs), transpiration rate (E), intercellular CO₂ concentration (Ci), and instantaneous water-use efficiency (WUE) in intact leaves. Based on the principle of open-system infrared gas analysis (IRGA), the instrument measures real-time differential CO₂ and H₂O vapor concentrations between inlet and outlet air streams across a sealed leaf chamber. Coupled with high-precision thermistor-based temperature sensing, capacitive relative humidity detection, and calibrated quantum (PAR) photometry, the system computes physiological parameters using standard biochemical models—including Farquhar-von Caemmerer-Berry (FvCB) model compatibility for advanced parameter estimation when paired with appropriate experimental protocols.
Key Features
- Modular architecture: Independent host unit interfaces with detachable handheld controller and interchangeable leaf chambers (standard 2.5 cm², optional 6.25 cm² or conifer needle adapters)
- Dual-channel non-dispersive infrared (NDIR) CO₂ analyzer with auto-zero calibration and temperature/pressure compensation
- High-stability dew-point hygrometer for absolute H₂O vapor concentration measurement (±0.1 mmol mol⁻¹ precision)
- Integrated 0–2000 µmol m⁻² s⁻¹ PAR sensor traceable to NIST-calibrated reference diodes
- Onboard microprocessor with embedded firmware supporting real-time calculation of An, gs, E, Ci, and intrinsic WUE
- USB and Bluetooth 5.0 connectivity for synchronized data streaming to external Windows-based laptops (Windows 10/11, ≥8 GB RAM recommended)
- Rugged aluminum alloy chassis rated IP54 for dust and splash resistance; operational range: 5–40 °C, 20–90% RH non-condensing
Sample Compatibility & Compliance
The JFQ-3150G supports measurements on broadleaf angiosperms, grasses, ferns, and select woody dicots with leaf thickness ≤5 mm and petiole diameter ≤4 mm. Compatible leaf chamber gaskets accommodate natural curvature without mechanical stress. The system conforms to ASTM E2912-22 (Standard Practice for Measurement of Photosynthetic Gas Exchange in Leaves) and aligns with ISO 17025:2017 documentation requirements for environmental monitoring instrumentation. All firmware logs include timestamped audit trails compliant with GLP principles; raw analog sensor outputs are preserved alongside calculated parameters to support method validation and reprocessing.
Software & Data Management
Data acquisition and visualization are managed via proprietary Windows desktop software (v4.2+), which provides synchronized multi-parameter time-series plots, batch export in CSV/Excel-compatible formats, and built-in tools for light-response (A/PAR) and CO₂-response (A/Ci) curve fitting. The software implements automatic outlier detection based on signal variance thresholds and supports user-defined metadata tagging (species, treatment, replicate ID). Exported datasets include full sensor calibration coefficients, environmental condition stamps, and chamber flow rate verification records—enabling full traceability required for peer-reviewed publication and regulatory submissions under FDA 21 CFR Part 11 (when deployed in controlled-environment agricultural R&D settings).
Applications
- Field and greenhouse evaluation of drought tolerance and heat stress responses in crop germplasm screening programs
- Long-term monitoring of photosynthetic acclimation in climate change simulation experiments (e.g., Free-Air CO₂ Enrichment—FACE sites)
- Phenotyping studies linking canopy-level spectral indices (e.g., NDVI, PRI) with leaf-scale gas exchange metrics
- Evaluation of stomatal kinetics under dynamic light regimes using rapid A/Ci protocol sequences
- Validation of chlorophyll fluorescence parameters (e.g., ΦPSII) against concurrent gas exchange measurements
- Teaching laboratories for plant physiology courses requiring hands-on IRGA operation and FvCB modeling fundamentals
FAQ
Is a laptop included with the JFQ-3150G system?
No. A Windows-based laptop (minimum i5 processor, 8 GB RAM, USB 3.0 port) must be provided separately for data acquisition and control.
What CO₂ source is required for closed-loop or reference-air calibration?
A standard 12-L aluminum CO₂ cylinder (99.99% purity, equipped with dual-stage regulator) is required; compatible with common lab-grade gas supply infrastructure.
Can the system operate autonomously without continuous laptop connection?
No. Real-time computation and storage rely on the external laptop; however, the host retains buffered sensor data for up to 15 minutes during brief disconnection events.
Are leaf chamber gaskets supplied with the base configuration?
Yes. Standard silicone rubber gaskets for flat and slightly curved leaves are included; specialized gaskets for needle-leaved species or thick succulent leaves are available as optional accessories.
Does the system support automated light-curve generation?
Yes—via programmable PAR ramping through the handheld controller or software interface, with configurable step duration, intensity increments, and stabilization delays per step.
