+86 19353291814
Plant Stomatal Meter
- Product Number:LD-ZT20
- Product Difference:Measure stomatal impedance, stomatal conductance, transpiration rate, air temperature and humidity, leaf temperature, photosynthetically active radiation, etc
+86 19353291814
Online ConsultationProduct Introduction
The Plant Stomatal Meter is a research-grade instrument employing both open-path and closed-path measurement methods. It measures the effects of various factors on leaf stomatal behavior, enabling convenient, repeatable, and accurate calculation of stomatal resistance, stomatal conductance, and transpiration rates. It also measures air temperature and humidity, leaf surface temperature, and photosynthetically active radiation (PAR). It is widely used in studies of plant leaf water physiology, crop water use, water stress damage, and the effects of biocontrol regulation.
The plant stomatal analyzer employs both open-path and closed-path measurement methods. The leaf surface is placed in an open leaf chamber, allowing atmospheric air to enter the chamber at a specific flow rate. The humidity of the gas entering and exiting the leaf chamber is measured separately. The transpiration rate is then calculated based on the humidity difference between the gas entering and exiting the leaf chamber.
Product Features
3.5" TFT true color LCD display with 800×480 resolution, clearly visible in bright light.
High-capacity 8.4V rechargeable lithium battery provides 20 hours of continuous operation per charge.
Large-capacity memory: 16GB internal storage, expandable to 32GB.
Data Transfer: Directly export data via USB connection to a computer.
Controls: Six buttons for simple, convenient operation. Configure and modify date, time, measurement intervals, data collection frequency, and test names.
Product parameters
| Measurement Unit | Transpiration Rate (Tr): mmol H₂O m⁻² s⁻¹; Total Leaf Conductance to Water Vapor (Gtw): mol H₂O m⁻² s⁻¹; Stomatal Conductance (Gsw): molH₂O·m⁻²·s⁻¹, Stomatal Resistance (Rs): cm⁻¹ |
| Accuracy | Transpiration 1–5%, Conductance 5–10% |
| Measurement Functions | Transpiration Rate, Total leaf conductance for water vapor, Stomatal conductance for water vapor, Stomatal resistance, Leaf temperature, Anteral inlet humidity, Anteral outlet humidity, Anteral temperature, Anteral humidity, Gas flow rate, PAR light intensity, Atmospheric pressure |
| Anteral temperature | High-precision digital temperature sensor by Heraeus, Germany. Measurement range: -20 to 80°C, Resolution: 0.1°C, Accuracy: ±0.2°C |
| Leaf Temperature | Type T thermocouple, Measurement Range: -20 to 60°C, resolution: 0.1°C, error: ±0.2°C |
| Three humidity sensors for inlet humidity, outlet humidity, and leaf chamber humidity | Swiss-imported high-precision digital humidity sensor, measurement range: 0-85%, Resolution: 0.1%, Accuracy: ≤ 1% |
| Built-in Photosynthetically Active Radiation Measurement (PARin) (Optional) | Silicon photodiode, Measurement Range: 0-2500 μmol m⁻² s⁻¹, Accuracy: ±5 μmol m⁻² s⁻¹, Response Wavelength Range: 400–700 nm |
| External photosynthetically active radiation sensor (PARout) | Silicon photodiode with correction filter, measurement range: 0–2500 μmol m⁻² s⁻¹, accuracy: ±5 μmol m⁻² s⁻¹, response wavelength range: 400–700 nm |
| Flow Measurement | Microelectronic flowmeter, flow rate freely adjustable within 0.2–1.2 L range, resolution: 0.0001 L |
| Zero Drift | ±0.005 L. Air pump flow rate configurable as needed to measure effects of varying gas flows on photosynthesis. with stable gas flow |
| New Leaf Chamber | Chamber clamping force adjustable for leaf thickness, preventing leaf damage and air leaks. Upper chamber covered with high-transmittance, non-shrink film for effective thermal insulation. Replaceable if punctured, torn, or soiled by leaves. Tripod mountable |
| Chamber Dimensions | Type I: (30×10mm), Type II: (30×20mm) - Standard size, Type III: (30×30mm) |
| Piping System | Utilizes composite plastic tubing with low moisture condensation and adsorption properties, maintains excellent performance even at high temperatures. Its smooth inner surface provides superior hydrophobicity compared to PVC or silicone tubing. ±1.5% |
| Data Storage | 16GB internal memory, expandable to 32GB |
| Data Transfer | Direct data export via USB connection to computer |
| Display | 3.5" TFT true color LCD monitor, resolution 800×480, clearly visible in bright light |
| Buttons | Six buttons for simple operation. Allows setting/modifying date, time, measurement interval, data collection count, and test name |
| Dimensions & Weight | 260×260×130mm, main unit 3.5kg |
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