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Since 1984, PP Systems has been recognized as a leader in the
design and manufacture of photosynthesis measurement instrumentation
for high level research. Currently, we have well over 1,000 portable
photosynthesis systems in operation throughout the world and are
widely referenced in many prestigious scientific publications.
Our TPS-2 Portable Photosynthesis System features
a high technical specification at an affordable price making it an
ideal choice for basic research and teaching. The system operation
and setup protocol is extremely user friendly. Although the main
application for the system is leaf gas exchange, the TPS-2 main
console can also be used as a high precision, stand-alone gas
analysis system for measurement of CO2 & H2O
in the lab or field.
Measurement Theory
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, flowmeters 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.
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The TPS-2 is supplied
complete with custom carrying bag and shoulder harness
for transport and use in the field.
An optional LED light unit is
available for control of light intensity in the cuvette.
The picture below shows the PLC4 (B) Broad Leaf Cuvette
with our optional LED light unit.
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