GB7974 Whiteness and Chroma Meter

GB7974Whiteness and Color Meter

Product Model: BG-48A

I. Product Introduction

This instrument is widely used in industries such as papermaking, printing, textile printing and dyeing, ceramics and enamel, building materials, chemicals, grain, and salt production to measure the whiteness, yellowness, color, and color difference of objects. It can also measure the opacity, transparency, light scattering coefficient, light absorption coefficient, and ink absorption value of paper.

This instrument can measure CIE (1982) whiteness (Ganz visual whiteness) W₁₀ and tint deviation T_w10. It can measure ISO whiteness (R₄₅₇ blue light whiteness) and Z whiteness (R_z). For fluorescent whitened samples, it can also measure the fluorescent whitening degree produced by the emission of fluorescent substances. It measures the whiteness W_J of building materials and non-metallic mineral products. It can also measure Hunter whiteness W_H.

II. Main Performance Features

1. Measure the color of objects, report diffuse reflectance factors R_x, R_y, R_z, tristimulus values X₁₀, Y₁₀, Z₁₀, chromaticity coordinates x₁₀, y₁₀, lightness L*, chroma a*, b*, saturation C*_ab, hue angle h*_ab, dominant wavelength λ_d, excitation purity P_e, color difference ΔE*_ab, lightness difference ΔL*, saturation difference ΔC*_ab, hue difference ΔH*_ab, and Hunter system L, a, b.

2. The instrument has added the function of measuring pencil lead concentration.

3. The instrument includes a printer and uses an imported thermal printer core, which does not require ink or ribbons, operates silently, and has fast printing speed.

4. The instrument is equipped with a standard RS232 interface for communication with computer software.

5. Measure yellowness YI, opacity OP, light scattering coefficient S, light absorption coefficient A, transparency, and ink absorption value.

6. The reference sample can be a physical object or data. The instrument can store and remember up to ten reference sample information.

7. The instrument has a memory function. Even after long-term shutdown and power loss, useful information such as zero adjustment, calibration, standard sample, and reference sample values stored in memory will not be lost.

8. Measure reflected optical density D_y, D_z (pencil lead concentration).

III. Main Technical Parameters

1. Simulates D65 illuminant lighting. Uses the CIE1964 supplementary colorimetric system and CIE1976 (L*a*b*) color space color difference formula.

2. Uses d/o illumination and viewing geometry. The diffuse sphere has a diameter of 150mm, the measurement aperture diameter is 25mm, and it is equipped with a light absorber to eliminate the influence of specular reflection from the sample.

3. Measurement repeatability: σ (Y₁₀) < 0.1, σ (X₁₀, Y₁₀) < 0.001.

4. Accuracy: ΔY₁₀ < 1.0, Δx₁₀ (Δy₁₀) < 0.01.

5. Sample size: test surface not less than Φ30mm, thickness not exceeding 40mm.

6. Power supply: AC220V, 50Hz, 0.3A.

7. Operating environment: temperature 10～30℃, relative humidity not exceeding 85%.

8. Dimensions and weight: 364×264×400 (mm), 17 kg.

9. Packaging dimensions and weight: 520×360×600 (mm), 26kg.

IV. Compliance Standards

GB7973: Method for determination of diffuse reflectance factor of pulp, paper, and paperboard (d/o).

GB7974: Method for determination of whiteness of paper and paperboard (d/o).

GB7975: Method for determination of color of paper and paperboard (d/o).

GB3979: Method for measurement of object color.

GB2913: Test method for whiteness of plastics.

GB1840: Method for determination of industrial potato starch.

GB8425: Instrumental assessment method for whiteness of textiles.

GB9338: Method for determination of whiteness of fluorescent whitening agents.

GB4739: Method for determination of colority of daily-use ceramic pigments.

GB6689: Determination of color difference of dyes, instrumental method.

GB8424: Method for determination of color and color difference of textiles.

GB1543: Method for determination of opacity of paper.

GB2409: Test method for yellowness index of plastics.

GB8940.2: Method for determination of whiteness of pulp.

GB13025: General test methods for salt industry, determination of whiteness.

GB11942: Method for colorimetric measurement of colored building materials.

GB10339: Method for determination of light scattering coefficient and light absorption coefficient of paper and pulp.

GB12911: Method for determination of ink absorbency of paper and paperboard.

GB9984.1: Determination of whiteness of industrial sodium tripolyphosphate.

GB13176.1: Determination of whiteness of laundry detergent.

GB11186.1: Method for measurement of color of paint films.

GB13531.2: Determination of tristimulus values and color difference ΔE* of cosmetics color.

GB/T13835.7: Test method for whiteness of rabbit hair fiber.

GB/T5950: Method for measurement of whiteness of building materials and non-metallic mineral products.

QB/T1503-1992: Method for determination of whiteness of daily-use ceramics.

ISO2470: Paper and board — Measurement of diffuse blue reflectance factor (ISO brightness).

ISO2471: Paper and board — Determination of opacity.

Textile industry standard: Method for determination of whiteness of pulp for chemical fibers.