Yaxin-818 Pn meter  This instrument is specially designed for photosynthesis experiment of middle school. It can quickly and quantitatively measure leaf photosynthesis or respiration. Ⅰ、 Features Ⅱ、 Application It can meet the need of The testing of leaf photosynthetic and respiration rates，curve Pn-par，effective of CO2 concentration and temperature to pn. The instrument can also be used in SMART projects, additional characteristic courses, laboratory and training of teacher skills. Ⅲ、 Principle The change value of CO2 concentration in the closed chamber was measured within a certain time, and then the photosynthetic rate of leaves was calculated. Ⅳ、 Function 1. Measurement CO2 concentration, Humidity, Temperature, Leaf surface temperature, Light intensity (PAR), Flow rate 2、calculation Photosynthetic / respiratory rate (Pn value) 3. Display Pressure (P), Chamber volume, Leaf area, Light intensity (PAR), CO2 concentration, Time, air temperature (Tair), ΔCO2, photosynthetic rate (Pn) 4. Control Six level of PAR can be selected. Three level of the light-adaption time can be adjusted. 5. Software projection; data transmission without installation 6. Power Rechargeable battery; low voltage alarm Ⅴ、 Specification 1. CO2 sensor type: diffuse infrared analyzer; Range: 0.0-3000.0 ppm; Resolution: 1.0 ppm; Accuracy: ± 10.0 ppm; Response time: 2 s 2. Air temperature sensor Category: Digital IC sensor; Range: 0.0～50.0 ℃; Resolution: 0.1℃; Error: ± 0.5 ℃ 3. light source Category: white LED, integrated with chamber; Range: 0-1500 μ mol/m2s; Gear: 6 adjustable； Illumination area: 12cm2 4. Power Battery: 7.2 V 10.0 Ah rechargeable lithium battery, 7 ~ 9 h service life Power adapter: 8.4 V 2.0 A lithium battery power adapter 5. Leaf chamber Volume: 150 mL 6. host Monitor: 800 × 600 touch screen；Transmission: USB 2.0; size: 34 × 20 × 17 cm; weight: 3.0 kg; other: Memory: 4000 sets measurement number; support firmware upgrade 7. Working environment Temperature: 0.0 ~ 50.0 ℃; humidity: 0 ~ 90% RH, no condensation
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