Konika Minolta CR-10 Portable Color Difference Meter
| Brand | Konica Minolta |
|---|---|
| Origin | Japan |
| Model | CR-10 |
| Instrument Type | Portable |
| Optical Geometry | d/8° integrating sphere (with specular component included) |
| Light Source | Pulsed Xenon Lamp |
| Spectral Range | 360 nm – 750 nm |
| Repeatability | ΔE*ab ≤ 0.1 (standard deviation, measured on certified white tile under D65/10°) |
Overview
The Konica Minolta CR-10 is a compact, battery-powered portable color difference meter engineered for rapid, on-site color evaluation in industrial quality control environments. It operates on the CIE L*a*b* and L*C*H* color spaces, delivering quantitative ΔE*ab color difference values in under one second per measurement. Its optical architecture follows the CIE-compliant d/8° geometry with specular component included (SCI), ensuring consistent evaluation of both matte and glossy surfaces without manual gloss compensation. All measurements are standardized to the CIE standard illuminant D65 and the CIE 10° observer function—conditions widely adopted in plastics, rubber, textiles, automotive interiors, and architectural coatings industries. The CR-10’s fixed 8 mm measurement aperture enables high spatial resolution while maintaining sufficient sampling area for representative readings on homogeneous materials. Its solid-state xenon flash source provides stable spectral output across the visible range (360–750 nm), eliminating lamp drift and thermal instability associated with tungsten-halogen or LED-based systems.
Key Features
- Compact, handheld form factor with integrated display, processor, and optical head—no external controller required.
- d/8° integrating sphere configuration with specular component included (SCI), compliant with ISO 7724-1, ASTM E308, and CIE Publication No. 15.
- High repeatability: ΔE*ab ≤ 0.1 (standard deviation) on calibrated white reference tile under controlled D65/10° conditions.
- Single-button operation: measure reference, then sample; result displayed within ~1 s as ΔE*ab alongside L*a*b* or L*C*H* coordinates.
- Power flexibility: operated via four AA alkaline batteries (≈2000 measurements at 10 s intervals) or optional AC adapter (AC-A12).
- Direct thermal printer interface via CR-A75 cable for real-time hardcopy documentation—supports traceable QC records.
Sample Compatibility & Compliance
The CR-10 is optimized for flat, opaque, and uniformly textured surfaces typical of molded plastics, extruded rubber profiles, painted panels, fabric swatches, and laminated interior trim. Its 8 mm aperture accommodates most production-line samples without requiring custom fixtures. While not designed for translucent, highly reflective, or microstructured surfaces (e.g., brushed metal, holographic films), it delivers robust performance on standard industrial substrates meeting ISO 2813 gloss thresholds (<70 GU at 60°). Device compliance includes adherence to CIE S 014-1/E:2006 (colorimetric observers), CIE S 014-2/E:2006 (illuminants), and ISO/CIE 11664-4:2019 (CIELAB color space definition). It supports GLP-aligned workflows through timestamped measurement logging (when paired with printer) and meets basic requirements for internal audit trails in non-regulated manufacturing settings.
Software & Data Management
The CR-10 operates as a standalone instrument with no embedded memory or PC connectivity beyond printer output. All data—including reference L*a*b*, sample L*a*b*, ΔE*ab, and measurement timestamp—is printed directly to compatible thermal printers (e.g., Konica Minolta CR-200 series). This design prioritizes operational simplicity and reduces validation overhead in regulated environments where software qualification (per FDA 21 CFR Part 11 or EU Annex 11) would otherwise be required. For laboratories requiring digital archiving, third-party barcode-scanned log sheets or manual entry into LIMS systems remain common practice. Firmware is fixed and unmodifiable, ensuring deterministic behavior across device lifecycles—consistent with ICH Q9 risk management principles for auxiliary QC instrumentation.
Applications
- Rubber compounding: batch-to-batch color consistency verification against master standards in tire sidewall or sealing gasket production.
- Plastics processing: in-line color matching for injection-molded housings, extruded profiles, and blow-molded containers.
- Textile dyeing: pass/fail assessment of dyed fabrics against approved shade cards in apparel and home furnishing supply chains.
- Automotive interiors: evaluation of dashboard trims, seat fabrics, and door panel inserts under standardized D65 lighting simulation.
- Architectural coatings: field verification of touch-up paint matches on façade panels and interior wall finishes.
FAQ
What does “d/8° with specular component included” mean for measurement accuracy?
It indicates that the instrument collects both diffuse and mirror-reflected light, enabling consistent color assessment across varying surface gloss levels—critical for comparing matte and semi-gloss materials under identical geometric conditions.
Can the CR-10 store multiple reference standards?
No—it retains only one reference channel. Users must re-measure the master standard before each new sample batch to ensure metrological continuity.
Is the CR-10 suitable for measuring metallic or pearlescent paints?
Not recommended. Its fixed 8° viewing angle and lack of multi-angle capability prevent accurate characterization of goniochromatic effects inherent in effect pigments.
Does the CR-10 comply with FDA 21 CFR Part 11?
No—its absence of electronic data storage, user authentication, or audit trail functionality places it outside the scope of Part 11 requirements. It functions as an analog-equivalent measurement tool.
What is the calibration interval recommendation?
Konica Minolta recommends annual verification using a certified white calibration tile (e.g., CR-200 series reference standard) and visual inspection of optical window cleanliness prior to critical measurements.
