NIPPON DENSHOKU OME7700 Benchtop Spectrophotometric Colorimeter for Petroleum Products and APHA/Gardner/Saybolt Color Scale Measurement
| Brand | NIPPON DENSHOKU |
|---|---|
| Origin | Japan |
| Model | OME7700 |
| Product Type | Spectrophotometric Colorimeter |
| Instrument Type | Benchtop |
| Optical Geometry | d/8° integrating sphere |
| Light Source | White LED |
| Spectral Range | 400–700 nm (10 nm interval) |
| Repeatability | ΔE*ab ≤ 0.03 |
| Display | 5.7″ color TFT LCD |
| Measurement Time | ≤ 5 s |
| Sample Compartment | Top-opening, pull-out design, accepts cuvettes up to 100 mm pathlength |
| Interface | USB (host & storage, FAT32), Parallel Port |
| Power | AC 100–240 V, 50/60 Hz, ≤35 VA |
| Dimensions (W×D×H) | 540 × 378 × 255 mm |
| Weight | ~17 kg |
Overview
The NIPPON DENSHOKU OME7700 is a high-precision benchtop spectrophotometric colorimeter engineered specifically for quantitative color assessment of transparent liquids across regulated industrial sectors—including petroleum refining, pharmaceutical excipient manufacturing, fine chemical synthesis, and potable water quality control. It operates on the principle of double-beam, post-dispersion spectroscopy with an integrated 150 mm diameter d/8° sphere geometry compliant with JIS Z 8722 and ISO/CIE standard illuminant and observer conditions. The instrument measures spectral transmittance and absorbance at 10 nm intervals from 400 nm to 700 nm using a stabilized white LED light source, enabling traceable, reproducible quantification of color in accordance with internationally recognized scales: APHA (Pt-Co), Gardner, ASTM D1209/D1500, and Saybolt. Its optical architecture eliminates stray light errors and minimizes photometric drift, ensuring long-term stability required for GLP-compliant routine analysis.
Key Features
- White LED illumination system with <1% intensity fluctuation over 10,000 hours—eliminates lamp replacement cycles and thermal drift associated with tungsten-halogen sources.
- Double-beam, post-monochromator optical design ensures real-time compensation for source aging and environmental fluctuations during measurement.
- Large top-access, slide-out sample compartment accommodates standard 10 mm to 100 mm pathlength cuvettes; optional test-tube holder enables direct analysis of cylindrical samples without transfer.
- 5.7-inch full-color TFT LCD with intuitive touch-sensitive interface supports multi-parameter display: spectral curves, CIE XYZ, L*a*b*, L*C*h*, Yxy, ΔE*ab, ΔE*94, ΔE00, CMC(2:1), and custom color difference vectors.
- Pre-programmed color scale algorithms for APHA, Gardner, ASTM D1500, Saybolt, and YI (ASTM E313) with automatic unit conversion and pass/fail thresholding per user-defined limits.
- Comprehensive illuminant library (A, C, D65, F6, F8, F10) and observer angles (2° and 10°) — configurable for dual-illuminant simultaneous evaluation when paired with optional software modules.
Sample Compatibility & Compliance
The OME7700 is validated for use with clear to slightly hazy liquid samples meeting ISO 4630 (Gardner color), ISO 6271 (APHA/Pt-Co), ASTM D1209 (APHA), ASTM D1500 (Petroleum Products), and ASTM D156 (Saybolt). It supports compliance workflows under FDA 21 CFR Part 11 (when used with validated NIPPON DENSHOKU ColorManager™ software), ISO/IEC 17025, and GMP Annex 11 requirements through audit-trail-enabled data logging, electronic signatures, and secure user access levels. All color scale calculations are traceable to NIST-traceable reference standards supplied with calibration verification kits.
Software & Data Management
Instrument data export is natively supported via USB mass storage (FAT32) in CSV format, preserving metadata including date/time stamp, operator ID, sample ID, measurement mode, illuminant/observer settings, and raw spectral values (400–700 nm @ 10 nm). Optional ColorManager™ PC software provides advanced reporting templates aligned with ISO 9001 internal audit requirements, statistical process control (SPC) charting, batch trend analysis, and automated PDF report generation with embedded spectral plots and conformance flags. Raw spectral data may be imported into third-party chemometric platforms (e.g., MATLAB, Unscrambler®) for multivariate modeling of color stability or degradation kinetics.
Applications
- Petroleum industry: Routine monitoring of lubricating oils, solvents, diesel fuels, and base stocks per ASTM D1500 and D1209 specifications.
- Pharmaceutical water systems: APHA color testing of Purified Water (PW) and Water for Injection (WFI) per USP and EP 2.2.59.
- Electrolyte formulation: Quantitative assessment of potassium hexafluorophosphate (LiPF₆) solutions and N-methyl-2-pyrrolidone (NMP) purity via APHA/Gardner correlation.
- Chemical intermediates: Color grading of organic solvents (e.g., acetone, THF, DMF), catalyst residues, and polymerization inhibitors.
- Cosmetic ingredient QC: Transparency validation of glycerin, propylene glycol, and hyaluronic acid solutions against internal color specifications.
FAQ
What color scales does the OME7700 support out-of-the-box?
APHA (Pt-Co), Gardner, ASTM D1500, Saybolt, and Yellowness Index (YI) per ASTM E313 — all calculated directly from measured spectral transmittance without external lookup tables.
Can the OME7700 measure opaque or turbid samples?
No — it is designed exclusively for transmission-mode analysis of transparent or near-transparent liquids. For reflectance or scattering samples, NIPPON DENSHOKU recommends the NR series reflectance spectrophotometers.
Is the instrument compliant with FDA 21 CFR Part 11?
Yes, when operated with validated ColorManager™ software v3.2 or later, which provides role-based access control, electronic signatures, and immutable audit trails for all measurement and configuration events.
What is the calibration frequency recommendation?
Annual factory recalibration is recommended; however, daily verification using supplied APHA and Gardner liquid standards (certified traceable to NIST SRM 2105 and SRM 2106) satisfies ISO/IEC 17025 interim verification requirements.
Does the OME7700 support networked data transfer?
Native Ethernet or Wi-Fi is not integrated; however, USB-connected PCs running ColorManager™ can relay data to LIMS or MES systems via OPC UA or RESTful API interfaces using middleware adapters.
