Choice Analytical Clarity Chorice hz Automatic Fuel Oil Color and Appearance Analyzer

Overview

The Choice Analytical Clarity Chorice hz Automatic Fuel Oil Color and Appearance Analyzer is an ASTM D8148–compliant benchtop instrument engineered for objective, repeatable assessment of visual quality parameters in distillate fuel oils—including diesel, jet fuel (Jet A/A-1), heating oil, and biodiesel blends. It employs a dual-path, high-fidelity optical measurement architecture—combining broadband visible-spectrum reflectance spectroscopy with calibrated digital imaging—to quantify two independent but complementary metrics: the Industry Hydrocarbon Rating (IHR), a 1–6 ordinal scale aligned with ASTM D4176 visual grading conventions, and the proprietary Hydrocarbon Clarity Index (HCI), a continuous 50–100 quantitative scale derived from multivariate analysis of hue, saturation, luminance, and turbidity signatures. Unlike subjective human observation or single-wavelength photometers, the Clarity Chorice hz eliminates inter-operator variability while maintaining full traceability to standardized reference materials and procedural controls defined in ASTM D8148.

Key Features

• Dual-mode compliance: Simultaneously reports both IHR (1–6) and HCI (50–100) per ASTM D8148 Section 8, enabling direct correlation with legacy manual grading records.
• Passive optical architecture: No moving parts, no consumable filters, and no fluidic path—minimizing maintenance, calibration drift, and downtime.
• Instrument-integrated calibration: On-board NIST-traceable white tile and turbidity standards enable field recalibration without external hardware or service dispatch.
• Regulatory-grade validation support: Built-in audit trail logs all user actions, calibration events, and result exports; supports 21 CFR Part 11-compliant electronic signatures when deployed with validated LIMS integration.
• Industrial safety certification: Certified to UL 61010-1, CSA C22.2 No. 61010-1, TÜV EN 61010-1, and CE Directive 2014/30/EU (EMC) and 2014/35/EU (LVD).
• Human-centered interface: 10.1″ true-color capacitive touchscreen with optional USB keyboard/mouse support; intuitive workflow navigation optimized for refinery QC labs and third-party testing facilities.
• Data longevity & interoperability: Stores ≥500 test records locally; exports via USB, Ethernet (TCP/IP), or direct LIMS push using ASTM E1394 or HL7 v2.5.1 message formats.

Sample Compatibility & Compliance

The Clarity Chorice hz accepts standard 50 mL or 100 mL clear glass sample vials (ASTM D1298-compliant) and accommodates fuels across the full volatility range of ASTM D975 (diesel), D1655 (jet fuel), and D396 (heating oil). It is validated for use with hydrotreated, Fischer–Tropsch, and fatty acid methyl ester (FAME)-blended fuels up to B20. All measurements conform to the procedural rigor of ASTM D8148–22 (Standard Test Method for Automated Determination of Color and Appearance of Distillate Fuels), including mandatory pre-conditioning at 40 °C ± 1 °C and controlled ambient lighting (≥200 lux, 5000 K CCT). Instrument performance verification meets ISO/IEC 17025:2017 clause 6.4.3 requirements for measurement uncertainty estimation in visual property testing.

Software & Data Management

Firmware v3.2+ includes embedded ClarityOS™—a real-time Linux-based platform supporting role-based access control (RBAC), configurable pass/fail limits per product specification (e.g., ASTM D975 §4.2.1 requires IHR ≤ 3 for No. 2-D diesel), and automated turbidity trend analysis across time, temperature, and HCI/IHR correlation matrices. Raw spectral data (380–780 nm @ 5 nm resolution) and image metadata are retained with each result. Export options include CSV (with ISO 8601 timestamps), PDF reports (PDF/A-1b compliant), and structured XML for laboratory information management systems. Audit logs record operator ID, timestamp, calibration status, environmental sensor readings (ambient temp/humidity), and any deviation flags—fully compliant with GLP and GMP documentation expectations.

Applications

• Refinery final product release testing against internal specifications and ASTM D975/D1655 color limits.
• Monitoring thermal oxidation stability during accelerated aging studies (e.g., ASTM D2274).
• QC screening of feedstock blending consistency prior to hydrotreating or fractionation.
• Third-party certification laboratories performing ASTM D8148–accredited testing for regulatory submission (EPA, Transport Canada, EU EN 590).
• Research into particulate formation mechanisms via HCI temporal decay modeling under controlled thermal stress.

FAQ

Does the Clarity Chorice hz replace ASTM D4176 manual grading?
No—it provides equivalent IHR output per ASTM D8148, which has been formally adopted as the automated alternative to D4176. Both methods remain valid; D8148 enables higher throughput and reduced subjectivity.
Can HCI values be correlated to specific contaminant concentrations?
HCI is a composite index—not a direct concentration metric—but statistically significant correlations have been established between HCI decay rates and soluble oxidation products (e.g., carboxylic acids) measured via FTIR per ASTM D7414.
Is method validation required before first use?
Yes. Per ASTM D8148 Section 6.2, users must perform initial system suitability testing using certified reference oils (e.g., NIST SRM 2721) and document repeatability (≤0.3 IHR units, ≤1.2 HCI units) across three independent runs.
What environmental conditions affect measurement accuracy?
Ambient light intensity must be maintained between 150–300 lux (measured at sample plane); deviations >±10% require re-calibration. Ambient temperature should remain within 15–30 °C during operation.
Is remote firmware update supported?
Yes—via secure HTTPS-based OTA (over-the-air) updates through the instrument’s Ethernet port; all updates undergo cryptographic signature verification and generate immutable versioned audit entries.