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Microcomputer based desktop fluorescence whiteness analyzer WSB-3Y
The microcomputer based fluorescence whiteness meter consists of a light source, optical system, detection system, microcomputer data processing and d
Product details
The microcomputer based fluorescence whiteness meter consists of a light source, optical system, detection system, microcomputer data processing and display system, etc.The overall whiteness of the substance is R457.R457=blue light whiteness r457+fluorescent whitening F
The whiteness of an ideal surface with a spectral diffuse reflectance ratio of 1 is defined as 100, and the absolute whiteness of a black surface with a spectral diffuse reflectance ratio of 0 is defined as 0.
This instrument is designed in full accordance with the standard light sources and lighting conditions specified by the International Commission on Illumination (CIE). Through strict testing and debugging, and in compliance with the enterprise standard Q/TDKY02-2004, it can be applied to national standards such as GB2913, GB5950, GB8940.1, GB12097, GB13025.2, etc.
2、 Working principle
The instrument utilizes the principle of photoelectric conversion and adopts an analog-to-digital conversion circuit to measure the radiance energy value of the white reflection on the surface of the sample. After signal amplification, A/D conversion, data processing, and finally display the corresponding whiteness value.
3、 Purpose:
This instrument can be widely used for measuring the whiteness of objects such as textile printing and dyeing, paint and coatings, chemical building materials, paper and cardboard, plastic products, white cement, ceramics, enamel, porcelain clay, talcum powder, starch, flour, salt, detergents, cosmetics, etc. The opacity of paper can be calculated through measurement.
1. Measure the diffuse reflectance factor (r457) of the sample at 457nm for blue light）It is called "Blue Light Whiteness R457”
2. The determination of whether the sample contains fluorescent whitening agents and the measurement of the fluorescence whiteness value generated by fluorescence emission is called "fluorescence whitening degree F”Or 'whitening degree F'.
4、 Functional Features
1Measure the r457 value and fluorescence whitening F value of the test substance at once. This method is easy to use and has stable measurement values.
2. The operation interface is simple, and according to the workflow in the appendix, you can directly master the operation method.
3. Adopting a large screen high-definition LCD display, it has comfortable reading and is not affected by natural light.
4. By using low drift high-precision integrated circuits and high-efficiency long-life light sources, the instrument can effectively ensure long-term stable operation.
5. Reasonable and concise optical path design can effectively ensure the correctness and repeatability of measurement values.
6. Simple operation can stably measure the opacity of paper.
7. Using a national calibration whiteboard to transmit standard values ensures reliable measurement.
5、 Precautions
This instrument is a measuring device and must not be disassembled at will. Please read the instructions carefully before use.
1. The working environment should be free of corrosive gases and vibration sources.
2. There should be no strong light sources or strong magnetic field interference around.
3. The surrounding air should be dry and free of floating objects such as dust.
4. After the instrument is stopped for a long time, the preheating time should be correspondingly extended to improve stability.
5. The power supply voltage must meet the working conditions.
6. Do not drop the sample into the measuring cylinder to avoid being unable to zero.
7. Do not touch optical components directly with your hands to avoid affecting their spectral characteristics.
8. Do not contaminate the black tube and work whiteboard to avoid affecting accuracy.
6、 Main technical parameters
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Measurement range: 0 to 199
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Measurement content: Blue light whiteness r457 fluorescent whitening F
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Light source: LED light source
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Testing conditions: comply with GB/T3978 standard 45/0
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Display: LCD liquid crystal display
Measurement aperture: ￠ 30
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Minimum indication: 0.1
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Measurement repeatability: 0.2
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Indication error:≤±1
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Usage environment: temperature (5 ℃~35 ℃); Humidity (≤ 85% RH)
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Transportation and storage environment: temperature (-20 ℃~50 ℃); Humidity (≤ 90% RH)
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7、 Instructions for use
(1)Instructions for use
1. Before using the instrument, it is necessary to carefully read this manual and strictly follow the prescribed working conditions and usage methods.
2. The working standard whiteboard and reference standard whiteboard are used for calibration and calibration of instruments during operation. The surface must be kept clean, especially the working standard whiteboard, which cannot be exposed to dust to avoid artificially affecting its standard value. In daily work, the reference standard whiteboard should be used to calibrate the instrument, and the measurement value of the reference standard whiteboard is transmitted by the random working standard whiteboard standard value When working, attention should be paid to the orientation of the whiteboard, and the marked surface should face the operator.
3. Before starting up, use a clean and lint free cotton cloth or paper to wipe the sample holder and measuring port of the instrument clean to prevent contamination of the whiteboard and test samples.
4. The surface of the tested sample must be uniform and flat. During repeated testing, the consistency of the longitudinal and transverse directions of the tested sample should be maintained. For testing non flat and uniform tested samples (such as powders, particles, fibers, etc.), the sampling method is described in the sample preparation.
(II)Sample making
1. If there is an "unevenness" phenomenon on the measurement surface of the sample that cannot be improved, or if there are differences in horizontal and vertical lines, the sample can be measured at different positions or angles, and the average of the measured whiteness values can be taken to represent the whiteness of this sample.
2. For paper, cloth, and various fiber fabrics, multiple layers of overlapping samples should be taken until they are opaque (for paper, several overlapping samples of 50 × 70 millimeters should be taken according to QB534-67 regulations until they are opaque, that is, increasing the number of samples until the whiteness value remains unchanged is considered opaque). Place the sample on the sample holder so that it is parallel to the testing personnel in the longitudinal direction (parallel to the direction of the instrument panel).
3. For powder or fine granular samples, the sample should be placed in a powder container and the surface of the sample should be flattened with a clean and smooth glass plate. Due to different testing conditions, different test results may be obtained. So, in order to establish the relationship between whiteness values of similar samples, it is necessary to standardize the sampling method for testing samples. Including weight, particle size, and compaction method, to achieve similar density and surface smoothness between samples. If high measurement accuracy is required, the constant pressure powder former produced by our factory should be purchased.
4. For fibrous items such as cotton, synthetic fibers, wool, silk, etc., they should be first sorted and combed into a longitudinal surface, and then placed in a self-made sample box for testing. The sampling method (including quantity) should be uniform, and it is advisable to make several more samples to measure their average value.
(3)Measurement preparation and measurement process
1. Measurement preparation:
Connect the power cord or install the battery, press the power switch on the left side of the instrument, and the display screen should show a number. Preheat for 60 seconds.
2Operation flowchart: see Appendix
3. Measurement of opacity T
Test according to the method specified in ISO2471-77.
After pre adjustment, the instrument should test the sample with sufficient thickness and layers to limit opacity.
a. Place the sample on the instrument for testing, then remove the top layer of the sample and place it on the bottom layer to measure a total of five layers of samples. Record the light reflection factor R ∞ of each layer of the sample.
b. Take the five layers of samples that have been tested above and use a black tube as the substrate to record the light reflection factor RO on the surface of each layer.
c. Repeat steps a and b to measure the R ∞ and RO values of each layer of the original sample.
d. Calculate the average value of R ∞ and RO on the positive and negative sides of the sample.
e. Calculate the opacity of the front and back sides (T):
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R0
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T=100
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────
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R∞
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Calculate the opacity of each side accurately to 0.5%. If the difference is greater than 0.5%, the opacity of the front and back sides should be identified separately. If the difference is not greater than 0.5%, report the overall average value.
8、 Maintenance and overhaul of instruments
1. Standard board for whiteness
Random work standard whiteboards and fluorescent whiteboards should be regularly submitted to higher-level measurement units or industry testing centers for approval, once a year. If contaminated, it should be promptly sent for inspection and recalibrated after cleaning.
The calibration of the reference whiteboard is a random calibration, conducted at least once a month, and should be properly stored. The calibration value transmission method is specified in Article 3 of the "Measurement Preparation" section.
2When testing powder or fine granular samples, try to purchase the powder forming machine produced by our company. Carefully and slowly place the sample under the measuring port to avoid the instrument being unable to calibrate zero and the measurement being inaccurate.
3. Within one year from the date of purchase of the instrument, if the instrument is damaged or cannot work due to manufacturing quality issues, the manufacturer is responsible for repairing it for the user free of charge, provided that the user operates and uses the instrument in accordance with the prescribed methods. If the instrument is damaged due to improper use by the user, the manufacturer will charge corresponding parts and labor costs. The manufacturer is responsible for lifelong maintenance of products outside the warranty period.
9、 Complete set packing list
1. 1 digital whiteness meter
2. Attachment: 1 Work Standard Whiteboard
1 reference standard whiteboard
1 fluorescent standard whiteboard
1 black tube
1 powder dish
1 user manual
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