Whiteness Meter LWM-T2010

Introduction

Whiteness Meter features a measurement range of 0 to 120, allowing precise evaluation of whiteness levels across a wide variety of materials. The system has high repeatability, ensuring consistent and reliable results with each test. It includes continuous multi-sample averaging for automatically calculating mean values over repeated measurements. Our whiteness tester has an touchscreen and microcomputer control for fast data entry and navigation.

This test equipment is designed to meet the rigorous requirements of modern laboratory operations, ensuring high precision, reliability, and ease of use for various experimental applications.

Applications

Whiteness Meter is an optical instrument that measures the degree of whiteness of a material. It plays a key role in food, pharmaceutical, construction materials, plastics, and coatings for verifying the whiteness of materials.

Specifications

Measurement Range	0 to 120
Zero Drift	≤ 0.1%
Indication Drift	≤ 0.1%
Indication Error	≤ 0.5%
Repeatability	≤ 0.1%
Reflectance Error	≤ 0.1%
Sample Size	Test plane ≥ Φ 30mm, thickness ≤ 40mm
Temperature	0 to 40°C
Relative Humidity	< 85%
Power Supply	220V ± 10%, 50Hz, 0.3A
Overall Dimension (L× W× H)	365 mm× 260 mm × 425 mm
Weight	11KG

Features

High Measurement Stability

Automatic Calibration Mode

Portable Battery Operation

Specular Light Absorber

Zero-Drift Accuracy

FAQs

1. What is a whiteness meter and how does it work?

whiteness meter measures the whiteness of materials like paper, textiles, plastics, powders, and ceramics by projecting light—typically mimicking daylight (e.g., tungsten or D65 light sources)—onto a sample. In many models, the light strikes at a 45° angle and is diffusely reflected; a photocell then detects the blue-spectrum component (around 440–457?nm) while filters exclude longer visible wavelengths and UV, ensuring accurate readings. The resulting signal is compared against standards (commonly magnesium oxide or -level whites), yielding a whiteness value on a defined scale. These instruments support daily calibration using white and black tiles, and modern devices include onboard data storage and connectivity options for importing data into lab systems.

2. Which industries commonly use whiteness meter ?

whiteness meter are essential quality control tools in industries where appearance and color consistency matter. In paper and pulp, they're used to assess brightness and ensure uniformity. Textile manufacturers rely on them to check bleaching and finishing results. Plastics and coatings producers use them to verify surface color uniformity, while cement, ceramics, paints, and enamel manufacturers ensure consistent whiteness in building materials. Food and powder sectors—such as sugar, flour, starch, salt, and cosmetic powders—use whiteness metrics to maintain quality and consumer appeal.

3. How do optical brighteners influence readings of whiteness meter ?

It supplies advanced whiteness meter .Optical Brightening Agents (OBAs), also known as Fluorescent Whitening Agents (FWAs), absorb ultraviolet light (below 400?nm) and re-emit it as visible blue light (400–480?nm), making samples appear “whiter than white.” This fluorescence can push reflectance readings above 100%, skewing the perceived whiteness unless controlled. Whiteness meters incorporate UV filters or adjustable filter systems to mimic daylight ( D65), ensuring that measurements remain accurate and consistent by accounting for the fluorescent contribution.

4. What are the standard methods for measuring whiteness in whiteness meter ?

It supplies advanced whiteness meter .Different industries use different standardized whiteness indices. The Whiteness Index () calculates whiteness based on tristimulus values under D65 light and a 10° observer. E313 provides general whiteness/yellowness indices, referencing methods. The Ganz-Griesser method, used often in textiles, includes UV calibration to control fluorescent effects. standards like 2470-1 (indoor brightness), 2470-2 (D65 brightness), and 2469 define measurement geometry and filtering protocols for blue reflectance, ensuring consistency across applications.

5. How often should whiteness meter be calibrated?

It supplies advanced whiteness meter .Daily calibration with a dark trap (black reference) and a white tile is essential to maintain accuracy. Weekly UV calibration is recommended for fluorescent samples, using primary reference standards such as Hohenstein or Paprican to adjust UV-filter settings. Transfer tiles allow continued checks without constant primary standard use. Instruments may require full recalibration on a manufacturer’s schedule or after considerable wear. Monitoring lamp intensity and sphere coating helps drift and sustain reliability.