Chlorophyll detector

Purpose:

The chlorophyll detector can instantly measure the relative chlorophyll content (unit: SPAD) or greenness and leaf temperature of plants, so as to understand the real nitro demand of plants and the lack of soil nitro or whether too much nitrogen fertilizer is applied. This instrument can be used to increase the utilization rate of nitrogen fertilizer and protect the environment. It can be widely used in the research of plant physiological indicators and guidance of agricultural production in agricultural and forestry related scientific research units and colleges and universities.

Instrument principle:

According to the absorption of the visible spectrum by the chloroplast pigment extract, the absorbance is measured at a specific wavelength using a spectrophotometer, and the content of each pigment in the extract can be calculated using a formula. According to the Lambert-Beer law, the absorbance A of a colored solution is proportional to the solute concentration C and the liquid layer thickness L, that is, A=αCL, where α is the proportional constant. When the solution concentration is in percentage concentration and the liquid layer thickness is 1cm, α is the absorption coefficient of the substance. The absorbance coefficients of various colored substance solutions at different wavelengths can be obtained by measuring the absorbance of pure substances of known concentration at different wavelengths. If there are several absorbing substances in the solution, the total absorbance of the mixture at a certain wavelength is equal to the sum of the absorbances of each component at the corresponding wavelength. This is the additivity of absorbance. To determine the content of chlorophyll a, b and carotenoids in the mixed extract of chloroplast pigments, it is only necessary to measure the absorbance A of the extract at three specific wavelengths, and the concentration can be calculated based on the absorbance coefficients of chlorophyll a, b and carotenoids at the wavelength. In order to eliminate the interference of carotenoids when measuring chlorophyll a and b, the wavelength of the monochromatic light used is selected to be the maximum absorption peak of chlorophyll in the red light region.

Features:

HM-YB chlorophyll detector can measure two parameters, chlorophyll and leaf surface temperature, at the same time, with upper computer software function, and data can be exported.

Rapid non-destructive plant live detection, does not affect plant growth.

All parameters can be measured at the same time in one operation and displayed in real time.

Historical data can be viewed sequentially.

Measurement data can be connected to a computer to export measurement data, which is convenient for plant nutrient management and analysis.

Historical data can be viewed sequentially or by jumping.

Data saved in the host will not be lost after an unexpected power outage.

All historical data can be deleted with one click.

Measurement data can be exported by connecting to a computer to facilitate plant nutrient management and analysis.

Powered by lithium battery, with backlight function.

Reports and curves of each parameter can be selected for query and viewing in time periods.

The stored and recorded data can be backed up and saved in EXCEL format for later use.

The stored and recorded data curves can be backed up and saved in BMP picture format for later use.

Technical parameters:

1. Measurement range: Chlorophyll: 0.0-99.9SPAD

Leaf surface temperature: -10-99.9℃

2. Measurement accuracy: Chlorophyll: within ±1.0 SPAD unit (SPAD value is between 0-50 at room temperature)

Leaf surface temperature: ±0.5℃

3. Repeatability: Chlorophyll: within ±0.3 SPAD unit (SPAD value is between 0-50)

Leaf surface temperature: ±0.2℃

4. Measurement area: 2mm*2mm

5. Measurement time interval: less than 3 seconds

6. Data storage capacity: 1000 sets of data

7. Power supply: 4.2V rechargeable lithium battery

8. Battery capacity: 2000mah

9. Weight: 200g

10. Working and storage environment: -10℃~50℃ ≤85% relative humidity.

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