Plant chlorophyll meter

purpose

The HM-YA plant chlorophyll meter can measure the relative chlorophyll content (unit SPAD) or "greenness" of plants in real-time, which can understand the actual nitro demand of plants and help you understand the degree of soil nitro deficiency or whether nitrogen fertilizer is applied excessively. You can use this instrument to increase the utilization rate of nitrogen fertilizer and protect the environment (preventing excessive application of nitrogen fertilizer from polluting the environment, especially water sources).

operational principle

1. Working principle

Two LED light sources emit two types of light, one is red light (650nm) and the other is infrared light (940nm). The two types of light penetrate the blade and hit the receiver. The light signal is converted into an analog signal, which is amplified by an amplifier and converted into a digital signal by an analog/digital converter. The digital signal is processed by a microprocessor to calculate the SPAD value and displayed on the LCD screen.

2. Calibration and calculation of measurement values

(1) The calibration and calculation of measurement values for two LEDs emit light in sequence, and the received light is converted into an electrical signal. The ratio of light intensity is used to calculate.

(2) After the sample is clamped by the indenter, the two LEDs emit light again, and the light transmitted through the blades hits the receiver, which is converted into an electrical signal. The intensity ratio of the transmitted light is calculated.

(3) The values of steps 1 and 2 are used to calculate the SPAD measurement value, which represents the current relative chlorophyll content of the clamped sample leaves.

Technical indicators

1. Measurement range 0.0-99.9 SPAD

2. Measurement area 2mm * 2mm

3. Measurement accuracy within ± 1.0 SPAD units

(At room temperature, SPAD values range from 0 to 50)

4. Repeatability within ± 0.3 SPAD units

(SPAD value between 0-50)

5. The measurement time interval is less than 3 seconds

6. Data storage capacity 2GB

7. Power supply 4.2V rechargeable lithium battery

8. Battery capacity 800mah

9. Weight 250g

10. External dimensions 140 x 85 x 45mm (length x width x height)

11. Working and storage environment: 0 ℃ -50 ℃; 85% relative humidity

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