PREMOSYS PR-0228 d/8 Geometry Online Non-Contact Spectrophotometric Color Difference Meter

Overview

The PREMOSYS PR-0228 is an industrial-grade, online non-contact spectrophotometric color difference meter engineered for continuous, real-time color monitoring in high-throughput manufacturing environments. It operates on the d/8° integrating sphere geometry—compliant with ISO 7724-1 and CIE Publication No. 15—ensuring diffuse illumination and hemispherical viewing that minimizes directional bias from surface texture, gloss, or orientation. Unlike handheld or benchtop colorimeters, the PR-0228 integrates directly into production lines via fiber-optic coupling to its dedicated measurement head (PR-0128), enabling stable optical path separation between the sensitive spectrometer module and harsh factory conditions (e.g., vibration, ambient temperature fluctuation, dust). Its 400–700 nm spectral range covers the full human photopic response, digitized at high wavelength resolution to support CIE 1931 XYZ tristimulus calculation, subsequent transformation into CIELAB (L*, a*, b*), and derivation of industry-standard color difference metrics including ΔE*_ab, ΔE*₀₀, and ΔE*_CMC.

Key Features

• True d/8° geometry with calibrated 6500 K LED source simulating D65 illuminant—traceable to NIST-certified standards
• Non-contact measurement at standoff distances of 15–50 mm, eliminating risk of surface contamination or mechanical wear
• Fiber-optic interface (SMA 905 connector) decouples the optical head (PR-0128) from the main spectrometer unit, enhancing thermal and mechanical stability
• Repeatability of ±0.5 ΔE*_ab under controlled conditions (23 °C ±2 °C, 50% RH ±5%), verified per ISO 13655:2017
• Ruggedized aluminum housing rated IP54 for operation in industrial enclosures; operating temperature range: 5–40 °C
• Real-time analog output (0–10 V / 4–20 mA) and digital communication via RS-485 Modbus RTU for seamless PLC integration

Sample Compatibility & Compliance

The PR-0228 accommodates diverse substrates without physical contact—including injection-molded plastics, painted metal housings, anodized aluminum, glossy polymer films, and matte-textured consumer electronics casings. Its integrating sphere design inherently compensates for variations in surface finish, reducing dependency on specular component exclusion (SCE) or inclusion (SCI) mode selection. The instrument complies with key international colorimetric standards: ISO 7724-1 (instrumental color measurement), ISO 11664 (colorimetry fundamentals), ASTM E308 (computing CIE tristimulus values), and ISO 13655 (spectral measurement uncertainty). It supports audit-ready data logging aligned with GLP/GMP principles when paired with optional software modules.

Software & Data Management

The PR-0228 interfaces with PREMOSYS ColorLink™ Suite (v3.2+), a Windows-based configuration and analytics platform supporting multi-channel calibration, tolerance zone definition (ellipsoidal or rectangular in CIELAB space), SPC charting (X-bar/R, Cp/Cpk), and automated pass/fail reporting. All measurements include embedded metadata: timestamp, sensor ID, ambient temperature/humidity (via optional external probe), and operator-defined batch/lot identifiers. Raw spectral data (31-point or 100-point scans) is exportable in CSV and XML formats. For regulated industries, optional 21 CFR Part 11 compliance packages provide electronic signature capability, user access control, and immutable audit trails.

Applications

• Inline color consistency verification during extrusion, injection molding, and coating processes
• Automated sorting of plastic granules or pellets based on L*a*b* deviation thresholds
• Final QA inspection of white goods (refrigerators, washing machines) and 3C products (smartphones, laptops, wearables)
• Batch-to-batch color matching validation for OEM suppliers in automotive interiors and appliance manufacturing
• Feedback control integration with dye dosing systems to maintain target chromaticity in continuous film production

FAQ

What does “d/8° geometry” mean in practice for production line deployment?
It denotes diffuse illumination at all angles within a spherical cavity, with detection at 8° from the normal—enabling robustness against part positioning variability and minimizing influence of surface gloss or texture.
Can the PR-0228 measure metallic or pearlescent finishes accurately?
Yes, when used with the optional multi-angle measurement add-on (PR-MAK-01), which extends angular sampling beyond standard d/8° to capture goniochromatic behavior per ASTM E2194.
Is spectral data stored onboard, or must it be streamed externally?
The device buffers up to 10,000 spectra locally; however, continuous streaming to SCADA or MES systems is recommended for traceability and statistical process control.
How frequently does the system require recalibration?
Factory calibration is valid for 12 months under normal operating conditions; annual verification using certified ceramic tile standards (e.g., NIST SRM 2021) is advised per ISO 9001 clause 7.1.5.2.
Does the PR-0228 support custom color spaces or proprietary tolerancing algorithms?
Yes—ColorLink™ Suite allows user-defined color spaces, custom ΔE weighting functions, and integration of customer-specific acceptance criteria via scriptable logic modules.