Purpose/Scope of Work The LSU School of Renewable Natural Resources requires a portable photosynthesis system that will simultaneously measure plant samples for photosynthetic gas exchange (including CO2 and H2O fluxes) and chlorophyll a fluorescence. The instrument will contain a chamber that attaches to leaves or small twigs. Conditions inside the chamber will be adjustable, including air temperature, photosynthetically active radiation, CO2 concentration, and relative humidity. An air pump and fan will move the air within the chamber to infrared gas analyzers. The instrument will contain an internal computer processor and memory. Current and past measured values will be visible on an interactive touch-screen display. Outputted values will include rates of stomatal conductance, net photosynthesis, and transpiration, as well as conditions within the chamber. The size of the console must be 15 to 20 cm in depth, 20 to 30 cm in width, and 15 to 25 cm in height, with a weight of <7 kg. The internal processor must have 2 GB RAM and 8 GB Flash memory. The display must be sunlight-readable TFT LCD with capacitive touch screen and resolution of at least 1024 x 600 pixels with dimensions of 26 cm diagonally. Power requirements must be 12 – 18 VDC or 24 VDC. The batteries must weigh < 0.6 kg and must have a capacity >6700 mAh and must be type Lithium Ion.; The system must have an operating temperature range of 0 – 50 °C.; The storage temperature range must be -20 – 60 °C.; The system must have a bulk flow rate range of 680 – 1700 µmol s-1 at SATP1.; The light source uniformity must be <±10% variation over 90% of aperture.; The chamber temperature control range must be 10 °C above or below ambient with a set point resolution of 0.1 °C.;
