Yaxin-1101s Pn Meter is specially designed for the teaching of plant physiology experiment in university. The instrument uses gas exchange method to measure leaf photosynthesis. The difference value of CO₂ concentration which leaf photosynthesis in chamber is measured, and then the photosynthetic rate of leaves is calculated.

I. Instrument Functions

1. Measurement function: Gas CO₂ concentration, humidity, temperature, leaf surface temperature, light intensity (PAR), gas flow rate;

2. Calculation function: Photosynthetic (respiration) rate, transpiration rate, intercellular CO₂ concentration and stomatal conductance

3. Display function: CO₂ reference value/measured value; RH (relative humidity) reference value/measured value; Air temperature; Leaf surface temperature; Leaf area, flow rate and atmospheric pressure; Light intensity (PAR)

4. Software functions: Synchronous projection function; Manually controllable light source; Transmission software is free of installation; Support firmware upgrade through USB port; There are two measurement system: open system and closed system. Open system is preferred.

5. Power supply function: Rechargeable battery; Low voltage alarm

Ⅱ. Technical Parameters

1. CO₂ sensor

Type: Non-diffusion infrared analyzer; Range: 0.0～2000.0 ppm; Resolution: 1.0 ppm; Accuracy: 3.0 ppm; Response time: 5s

2. Optical quantum sensor

Type: silicon photocell with correction filter; Range: 0.0～2500.0 μmol/m² s; Spectrum: 400.0～700.0 nm, visible light range; Resolution: 1 μmol/m² s; Error: 2%

3. Leaf temperature sensor

Type: T thermocouple; Range: 0.0 ~ 50.0℃; Resolution: 0.1℃; Error: 0.3℃; Response time: 1s

4. Air temperature sensor

Type: thermistor; Range: 0.0 ~ 50.0℃; Resolution: 0.1℃; Error: 0.3℃

5. Humidity sensor

Type: humidity sensitive capacitor; Range: 0 ~ 90% RH; Resolution: 0.10%; Error: ±1.5 %RH;

Response time: 8s

6. Flowmeter

Type: Microelectronic flowmeter; Range: 0.0 ~ 1.0 L/min; Resolution: 0.01 l/min; Error: 1% reading

7. Light control module

Type: LED white light source; Range: 0.0～3500.0 μmol /m² s can be set; Luminous area: 3.0× 7.5 cm; Light intensity control, set by software, automatic control

8. Power supply system

Battery: 7.2 V 10.0 AH rechargeable lithium battery, with battery life of 8~15h; Power adapter: 8.4V 2.0A lithium battery power adapter

9. Host

Display: 5-inch color touch screen; Storage: 9999 sets of data can be stored; Transmission: USB port; Size: 24.5×15.0×20.0 cm; Weight: about 3.3kg.

10. working environment

Temperature: -20.0 ~ 50.0℃; humidity: 0 ~ 90% RH, no condensation

11. Leaf chamber

Leaf chamber: (65×10mm)