Plant Photosynthesis Meter TP-PM-5

Introduction:

This system integrates advanced optical measurement technology with an electronic control system. Equipped with photoelectric sensors and high-precision humidity modules, it enables highly accurate measurement and stable control of carbon dioxide (CO₂) and water vapor (H₂O).The circuit design adopts a highly integrated modular architecture combined with a self-developed centralized control valve unit, optimizing structural layout for a more compact configuration. Extensive use of aerospace-grade aluminum components ensures durability while significantly reducing overall weight, making the instrument portable and suitable for field measurements in farmland or complex outdoor environments. It is designed to accommodate diverse on-site application scenarios.

Functional Specifications:

· Measurement Parameters
The system can detect and display the following 18 parameters:Inlet air temperature and humidity,Leaf chamber temperature and humidity,Photosynthetically Active Radiation (PAR),Leaf surface temperature (TI),Net photosynthetic rate (Pn),Stomatal conductance (Gs),Transpiration rate (Tr),Instantaneous water use efficiency (WUE),Atmospheric pressure,Flow rate,Reference chamber CO₂ concentration,Sample chamber CO₂ concentration,Light response curve,CO₂ response curve.Measurement resolution for all parameters reaches 0.1.

· Large Touchscreen Interface
≥10-inch ultra-large color touchscreen,Advanced Android operating system,One-touch measurement operation,Fully automated data acquisition,Automatic data saving upon completion,Manual termination supported as required

· Automatic Zero Calibration
Incorporates automatic zero calibration technology, enabling on-site precise calibration of CO₂ and H₂O. This ensures long-term stability and high-accuracy measurement, meeting high-frequency and long-term field photosynthesis monitoring requirements.

· Precise Environmental Control
The system provides precise regulation of key environmental parameters, including:Temperature,Humidity,CO₂ concentration,Light intensity.
Features include:High-efficiency temperature control module with rapid response;Leaf chamber head equipped with heat sink and cooling fan;Built-in CO₂ supply system with automatic precision control;Dual humidity sensor modules; Automatic measurement mode recognition;These functions significantly improve the accuracy and reliability of transpiration rate and stomatal conductance measurements.

· Multilingual Interface
Simplified Chinese interface,Supports Chinese-English switching,Language selectablein system settings.

· Real-Time Status Display
Displays precise date and time (YYYY-MM-DD HH:MM:SS),Battery level indicator,Low battery and charging status notifications.
· Measurement Mode
Photoelectric sensor-based detection,Advanced automatic temperature compensation,High-sensitivity PAR sensor integrated in leaf chamber head,Built-in temperature and humidity sensors in handle,Real-time monitoring of environmental factors affecting photosynthesis.

· Customizable Parameter Settings
Default file naming based on measurement date,Automatically records last measurement duration,User-defined file names and measurement duration supported.

· Custom Operation Notes
Users can input detailed experimental notes based on application conditions. Notes are stored together with measurement data in the same Excel file and exported synchronously,ensuring data traceability and integrity.

(Functional interface screenshots with bidder’s official seal required.)
· Fast Data Query
Time-based filtering;Single record viewing, uploading, exporting, deleting;Batch upload/export/delete operations;Highly efficient data management.

· Multiple Data Display Formats
Curve graphs, Tabular format, Double-click zoom-in for detailed curve analysis.

Technical Parameters:

1. CO₂ Sensor

Range: 0–2500 ppm
Resolution: ≤0.1 ppm

2. Quantum Sensor (PAR)

Range: 0–3000 μmol·m⁻²·s⁻¹
Spectral Range: 400–700 nm
Resolution: ≤0.1 μmol·m⁻²·s⁻¹

3. Leaf Temperature Sensor

Range: 0–45°C
Resolution: 0.1°C
Accuracy: ±1°C

4. Air Temperature Sensor

Range: 0–45°C
Resolution: 0.1°C
Accuracy: ±1°C

5. Humidity Sensor

Range: 0–75% RH (non-condensing)
Resolution: 0.1% RH
Accuracy: ±5% RH

6. Flow Meter

Range: 0–1.0 L/min
Resolution: ≤0.01 L/min

7. Light Control Module

Range: 0–2000 μmol·m⁻²·s⁻¹ @ 25°C
Leaf chamber area: 2 × 3 cm
Red light peak wavelength: 660 nm ±10 nm
Blue light peak wavelength: 453 nm ±10 nm

8. Pressure Sensor

Type: Integrated pressure sensor
Range: 15–115 kPa
Resolution: ≤0.1 kPa
Accuracy: ±1.5%

9. Main Unit

10-inch color touchscreen
Android OS onboard computer
RK3288 quad-core processor
1.6 GHz

10. Controller

CO₂ control range: 0–>2500 ppm
Leaf temperature control: Ambient ±10°C
Resolution: 0.1°C
Humidity control range: 0–90% RH (non-condensing)

11. CO₂ Injection System

8 g mini steel cylinder
Stable gas supply
Pressure: 500–1000 kPa

12. Drying Tube

Desiccant composition: 98% CaSO₄ and 2% CoCl₂
Color change after moisture absorption
Reusable after oven drying

13. Soda Lime Tube

Filled with soda lime
Color changes from white to blue-purple
Replacement frequency depends on usage

Leaf Chamber Requirements
Size: 2 cm × 3 cm
Suitable for most leaf measurements
Photosynthesis Parameter Resolution
Net photosynthetic rate (Pn): 0.1
Stomatal conductance (Gs): 0.1
Transpiration rate (Tr): 0.1
Intercellular CO₂ concentration (Ci): 0.1
Instantaneous water use efficiency (WUE): 0.1

Standard Configuration:

Main unit ×1
Main unit support stand ×1
Leaf chamber handle ×1
Handle support stand ×1