Applications:
Crop optimization
Measure photosynthetic response to fertilization and crop management techniques.
Climate & environmental research
Analyze changes in photosynthetic activity under environmental stressors such as drought, heat & contamination.
Forestry applications
Gas exchange measurements of trees and soil inform understanding of forest ecosystem health.
Specifications
- Lens On board IRGA for CO2 Analysis, H2O Analysis with humidity sensor capacitor, Flow Control, Pump, Display and Key Board, Leaf Chamber attachment ports and Battery.
- Display LCD 40 x 6 characters or 320 x 64 pixel
- Data Storage 4 MB Internal FLASH RAM
- Data Output USB
- Flow Rate 100~1000 cm3/min
- Operating Temperature 0-45 °C
- Operating RH 0-90% non-condensing
- Power Supply 7.2 VDC, 4400 mAh for 5 hours continuous use, extended hours of use with additional batteries. AC Adapter / Battery Charger supplied.
- Imaging Probe and Arm Weight 1.5 kg
- Weight 1.5 Kg (3 Lbs) with Battery
- Dimensions 44 cm x 5.5 cm x 5 cm
CO2 Analyzer
- Sensor Low power Non-Dispersive Infrared Gas Analyzer
- Chopping Frequency 1 Hz
- Sensors Response Time 35 seconds
- Source Life 5,000 hours
- Measuring Range 0 to 2000 ppm (Standard)-0 to 3000 ppm (Optional)
- Resolution 0.1 ppm
- Repeatability ±0.1 ppm (short term)
- Accuracy < ± 2% up to 2000 ppm
- Sample Cell 100 mm x 10.2 mm (3.94” L x 0.40” Dia)
H2O Analyzer
- Sensor Type Humidity Sensitive Capacitor
- Stability Stable Analyzer for accurate H20 measurements
- Measuring Range 0 to 100%
- Resolution 0.1%
- Accuracy ±2% at 10% RH, ±3.5% at 95% RH
PAR Measurement
- Sensor Type Filtered GaAsP-Photodiode
- Measuring Range 0~2500 µmol m-2s-1
- Accuracy ±5 µmol 0-2500 µmol/m2/sec
- Chamber Temperature Measurement
- Sensor Type Thermocouple
- Display LCD 40×6 characters 320×64 pixel
- Measuring Range -15~50°C
- Accuracy ±0.1°C
Leaf Temperature Measurement
- Sensor Type Infrared Sensor
- Measuring Range -10 ~ 50°C
- Accuracy ±0.3˚C
Theory of operation
Photosynthesis
Photosynthesis is the formation of carbohydrates from CO2 and a source of hydrogen (as water) in the chlorophyll-containing tissues of plants exposed to light. Photosynthetic rate is determined by measuring CO2 before and after it enters the leaf chamber to calculate the rate of CO2 assimilation by a known leaf area. See the calculation.
Transpiration
Transpiration is the movement of water vapor from leaf tissue into the atmosphere. Transpiration rate is determined by measuring water vapor before and after it enters the leaf chamber to calculate the rate of water vapor flux per one-sided leaf area. See the calculation.
Stomatal Conductance
Stomatal conductance refers to the openness of the leaf stomata determines the rate of CO2 assimilation into the leaf and water vapor exits the leaf through the stomata. Stomatal conductance is calculated by measuring transpiration rate as a function of leaf temperature. See the calculation.
Open or Closed System
The CI-340 is easily operable as either an open and closed system. In open system measurement, the incoming gas is drawn from the ambient, or control-module altered, air and the exhaust returns to the external atmosphere. During closed system measurements, the air is recirculated from the exhaust back into the chamber. See the calculation.
Absolute and Differential Readings
The CI-340 is designed to measure both absolute and differential readings. In Absolute Mode, the CI-340 measures gas concentrations from a single source. For differential measurements, the concentration of gases from both the inlet of the chamber and the chamber exhaust are measured.
