Price of portable whiteness tester

Instrument Name: Whiteness Meter/Intelligent Whiteness Meter/Digital Whiteness Meter
Company Name: Hangzhou Daji Optoelectronic Instrument Co., Ltd
Instrument model: WSB-VI
Introduction to Whiteness Meter/Intelligent Whiteness Meter/Digital Whiteness Meter
Hangzhou Daji Optoelectronic Instrument Co., Ltd. has more than 30 years of experience in manufacturing intelligent whiteness testers from 1990 to present. The newly launched "WSB-VI Intelligent Whiteness Tester (Desktop)" has been launched, which uses a long-life light source (with a service life of up to 100000 hours, eliminating the trouble of replacement and maintenance) and a fully sealed design to meet various production site measurements. Intelligent numerical processing algorithm: solves the problems of large measurement deviation and poor accuracy caused by simple linear calculation methods. Easy and convenient operation: one click zero calibration, whiteboard full digital calibration, automatic saving of calibration parameters. Highly integrated hardware design, embedded operating system. Fast digital filtering algorithm, complete the measurement in two seconds. This instrument is used to measure the blue light whiteness of object surfaces, and its technical performance complies with the JJG 512-2021 Whiteness Meter Calibration Regulations. The measurement results are displayed digitally, and the data can also be printed out using a printer (which is an optional accessory for users to choose according to their needs). It is easy to operate and has high accuracy. It is applicable to departments that need to measure the whiteness of products in flour, starch, Rice noodles, salt, textile, printing and dyeing, chemical fiber, plastic, porcelain clay, calcium carbonate, kaolin, titanium dioxide, paint, paint, ceramics, enamel and other industries.

Whiteness meter/intelligent whiteness meter/digital whiteness meter Precautions for purchasing a whiteness meter:

There are two main types of whiteness meters used in China according to optical conditions: one is 45/0 instruments, and the whiteness meters manufactured in Shanghai are basically of this type; One type is d/O instruments, such as the WSB-VI model manufactured by our company. The advantage of the 45/0 instrument is its small size, but it has the following disadvantages. And replaced by d/O instruments:
1. The 45/0 instrument whiteness meter cannot eliminate the interference of gloss. Whiteness measures the scattering of light by the sample, while the 45/0 instrument also measures glossiness that does not belong to whiteness as whiteness, resulting in varying degrees of overestimation of the results. Especially for high gloss samples. The higher the glossiness of the sample, the greater the error in the test results.
2. Due to the 45/0 instrument using parallel light irradiation at a 45 degree angle. The directionality of the sample has an impact on the test results, with some samples having a vertical and horizontal whiteness difference of up to 2.5%. Therefore, when using a 45/0 instrument whiteness meter to test whiteness, it is required that the diagonal direction of the sample be parallel to the front and rear directions of the instrument. This test result is consistent with the d/O instrument. And the d/O instrument uses an integrating sphere to generate diffuse reflection illumination. Can effectively eliminate the influence of gloss and sample directionality on the results. Therefore, d/0 instruments have been widely used.

The main manufacturers of whiteness meters are Hangzhou, Shanghai, and many others are OEM products, with a mix of good and bad products. Customers should pay attention when purchasing. Among them, Shanghai mainly produces portable products, and its desktop is developed from portable products. The manufacturing year is very short and the technology is relatively backward, all of which were only manufactured in 2005-2006. Hangzhou mainly produces desktop products with better performance. Because the head integrating sphere of the whiteness meter in Shanghai is very small, the test data is not accurate, the stability and repeatability are not very good, and there is no memory function. Before each measurement, manual zero adjustment and calibration are required. Our company's whiteness meter is mainly based on the technology of the Light Industry Automation Research Institute, which is relatively stable and mature. The instrument has low faults, a large integrating sphere, good repeatability, accurate data, and memory function. It does not require repeated calibration and zero calibration, and is easy to operate.


Technical parameters of whiteness meter/intelligent whiteness meter/digital whiteness meter:
1. Diffuse illumination vertical detection method (d/o). This instrument complies with GB3978-83: Standard Illumination Body and Illumination Observation Conditions. It simulates D65 illumination body illumination and adopts d/o illumination observation geometry conditions. The diameter of the diffuser sphere is Ø 120mm and the diameter of the measuring hole is Ø 20mm. It is equipped with a light absorber to eliminate the influence of mirror reflection light on the sample.
2. Illumination light source: D65 light source
3. Measurement method: Reflection
4. Repeatability ≤ 0.1
5. Indication drift ≤ 0.1
6. Zero drift ≤ 0.1
7. The displayed value wucha is ≤ 0.5
8. Indication accuracy: 0.1
8. Measurement hole diameter: The measured sample should not be less than 30mm in diameter
9. Output method: Display with 3 and a half digits, or print the data with a printer (the printer is an optional accessory that users can choose according to their needs)
10. Working environment: temperature (0-40) ℃, relative humidity<80% RH
11. Power supply: AC (220 ± 22) V, 50Hz (0.2A)
12. Dimensions: 220 × 295 × 375mm
13. Weight: 10kg


Working Principle:
The instrument uses an integrating sphere to measure spectral diffuse reflectance. Its optical principle is to use blue light emitted by a semiconductor light source to directly enter the integrating sphere. After diffuse reflection on the inner wall of the integrating sphere, the blue light illuminates the sample at the testing port. The spectrum reflected from the sample surface is received and converted into an electrical signal by a silicon photovoltaic cell after passing through a condenser, light barrier, and color filter group; There is also a silicon photovoltaic cell that receives the substrate signal inside the sphere. The two electrical signals are amplified separately and processed by the microcontroller to achieve the system functions of automatic zero calibration, working whiteboard calibration, and sample testing. Users can easily use this instrument to test the whiteness of various samples.

meet the standards
1. Complies with GB3978-83: Standard Lighting Bodies and Lighting Observation Conditions. Simulate D65 illumination body lighting. Using d/o illumination to observe geometric conditions (ISO2469), the diameter of the diffuser sphere is 150mm, and there are two types of test hole diameters: 30mm and 19mm. A light absorber is installed to eliminate the influence of specular reflection of the sample.
2. The peak wavelength of the spectral power distribution of the R457 whiteness optical system is 457nm, with a full width at half maximum of 44nm; the RY optical system complies with GB3979-83: Object Color Measurement Method.
3. GB7973-87: Determination of diffuse reflectance factor of pulp, paper and paperboard (d/o method).
4. GB7974-87: Determination of whiteness of paper and paperboard (d/o method).
5. GB8904.2: Method for determination of pulp whiteness.
6. GB1840: Method for determination of industrial potato starch.
7. GB13025.2: General test methods for salt industry, determination of whiteness
8. GBT/5950 Measurement method for whiteness of building materials and non-metallic mineral products.
9. Citric acid whiteness and its detection method