Measurement of CO2 uptake is the most commonly used and easiest method for determining the photosynthesis rate of plants. Using infra-red gas analysis techniques, we can readily determine CO2 concentrations to within 1 ppm (part per million) and instantaneous measurements are possible.
The TPS-2 passes a measured flow of air over a leaf sealed into a chamber called the leaf cuvette. Using a valve, the TPS-2 first samples the CO2 and H2O in the air going to the cuvette and then in the air leaving the cuvette. From the flow rate and the change in the CO2 and H2O concentrations, the assimilation rate of CO2 and the transpiration rate of water can be determined. This is commonly referred to as the “open system method of measurement”. This is the method used by the TPS-2 for CO2 measurements.
The TPS-2 is a completely self-contained unit with all the necessary pumps, flow meters and valves for measurements in the laboratory, classroom or field. Measurements can be made under ambient or changing conditions (CO2, H2O and light) for response curves. Comparative spot measurements, both inter- and intra-species, can readily be made.
The TPS-2 is supplied complete with custom carrying bag and shoulder harness for transport and use in the field.