Plant Transpiration Rate Tester

Instrument usage

The plant transpiration rate measuring instrument is a scientific research instrument that uses two measurement methods, open and closed. Used to measure the influence of various factors on leaf stomatal behavior, it can conveniently, repeatedly, and accurately calculate stomatal impedance, stomatal conductance, and transpiration rate. It can also measure air temperature and humidity, leaf surface temperature, and photosynthetically active radiation. Widely used in the study of water physiology in plant leaves, research on crop water use, water stress hazards, and biological control and regulation effects.

Measurement method

Two measurement methods: open circuit and closed circuit

Measuring principle

Principle: Place the leaf surface in an open leaf chamber and allow the atmosphere to enter the chamber at a certain flow rate. Measure the humidity of the gases entering and leaving the chamber separately, and then calculate the transpiration rate based on the difference in humidity between the gases entering and leaving the chamber.

Measurement function 

Transpiration rate, total conductance of leaves to water vapor, conductance of stomatal water vapor, stomatal impedance, leaf temperature, inlet humidity of leaf chamber, outlet humidity of leaf chamber, leaf chamber temperature, leaf chamber humidity, gas flow rate, light intensity PAR, atmospheric pressure.

Measurement unit: Transpiration rate (Tr): mmol H2Om-2 s-1

Total conductance of leaves to water vapor: (Gtw) molH2Om-2.s-1

Pore conductance (Gsw): molH2Om-2.s-1

Pore impedance (Rs): sm-1

Accuracy: Transpiration 1-5%, Conductivity 5-10%

Technical Specifications

Leaf chamber temperature:

German Heraeus high-precision digital temperature sensor, measurement range: -20-80 ℃, resolution: 0.1 ℃, error: ± 0.2 ℃

Leaf temperature:

T-type thermocouple, measurement range: -20-60 ℃, resolution: 0.1 ℃, error: ± 0.2 ℃

Three humidity sensors for intake humidity, exhaust humidity, and leaf chamber humidity:

Swiss imported high-precision digital humidity sensor:

Measurement range 0-85%, resolution: 0.1%, error ≤ 1%

Built in photosynthetically active radiation measurement (PARin): (optional)

Silicon photodiode

Measurement range: 0-2500 μ molm-2s-1, accuracy: ± 5 μ molm-2s-1. Response wavelength range: 400-700nm

External photosynthetically active radiation sensor (PARout):

Silicon photovoltaic cell with correction filter

Measurement range: 0-2500 μ molm-2s-1, accuracy: ± 5 μ molm-2s-1. Response wavelength range: 400-700nm

Flow measurement: Micro electronic flowmeter, flow rate can be set arbitrarily within the range of 0.2-1.2L. Resolution: 0.0001L,

Zero drift: ± 0.005L, the flow rate of the air pump can be set according to needs, and the influence of different gas flow rates on photosynthesis can be measured. The gas flow rate is stable.

New type of blade chamber: The clamping force of the blade chamber can be adjusted according to the thickness of the blade, which can not only avoid damaging the blade but also prevent air leakage. The upper blade chamber is covered with a high transparency, non shrink film, which can effectively insulate the heat. If the film is punctured, torn or dirty by the blade,

Can be replaced at any time. Can be configured with a tripod.

Leaf chamber size:

Type I: (30 × 10mm)

Type II: (30 × 20mm) standard size

Type III: (30 × 30mm)

Pipeline system: This instrument uses a composite plastic hose with low water retention and adsorption properties, which can maintain good performance even at high temperatures and has a smooth inner wall. Compared to PVC or silicone tubing, this tube has good hydrophobicity.

Atmospheric pressure:

Range: 150-1150mbar

Resolution: 0.1mbar

Error: ± 1.5%

Data storage: 16GB of memory, expandable to 32GB.

Data transfer: USB connection to computer can directly export data

Display: 3.5 "TFT true color LCD screen color display, resolution 800 × 480, clearly visible under strong light

Button: Six buttons, easy and convenient to operate, can set and modify dates, times, measurement intervals, data collection times, and test names.

Volume: 260 × 260 × 130mm

Weight: Host 3.5kg

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