TP692 TimePower Petroleum Colorimeter for ASTM D1500 / SH/T 0168 / GB/T 6540 Compliance

Overview

The TP692 TimePower Petroleum Colorimeter is a precision visual comparison instrument engineered for standardized color assessment of liquid petroleum products—including lubricating oils, base stocks, distillates, and residual fuels—according to internationally recognized methodologies. It operates on the principle of subjective visual color matching under controlled illumination and geometric viewing conditions, aligning with the fundamental requirements of ASTM D1500 (Standard Test Method for Color of Petroleum Products [Saybolt Chromometer]), SH/T 0168 (Chinese standard for petroleum product color determination), and GB/T 6540 (equivalent national standard). Unlike spectrophotometric or digital imaging systems, the TP692 relies on human observer evaluation against traceable physical reference standards—ensuring direct comparability with legacy data and regulatory submissions where visual scale correlation remains mandatory. Its design emphasizes optical fidelity, repeatability across operators, and long-term stability of reference materials, making it suitable for routine QC laboratories operating under ISO/IEC 17025-accredited quality systems.

Key Features

• Calibrated 26-position rotating color disc containing 25 certified glass color filters (corresponding to ASTM D1500 color numbers 0.5 through 8.0 in 0.5-unit increments, plus extended 1–25 scale per SH/T 0168) and one blank reference position for baseline verification
• Dual-path optical illumination system: frosted incandescent lamp with spectral conditioning filters ensures uniform, diffused, and color-temperature-stable irradiance across both the reference color disc and sample tube simultaneously
• Adjustable focus and brightness optical eyepiece enables precise parallax-free alignment and accommodates operator visual acuity variations without requiring corrective lenses
• Robust mechanical architecture with rigid aluminum housing and vibration-damped base minimizes misalignment during repeated use in industrial lab environments
• Compliant sample tube geometry (Ø32 mm × 120–130 mm) meets dimensional tolerances specified in ASTM D1500 Annex A1 and GB/T 6540 Clause 5.2 for consistent path length and meniscus control
• No software dependency or calibration drift—reference integrity is maintained solely through NIST-traceable color filter certification and periodic verification per ASTM D1500 Section 8.2

Sample Compatibility & Compliance

The TP692 accepts transparent to slightly hazy petroleum liquids that meet the clarity criteria defined in ASTM D1500 Section 6.1 (i.e., free of suspended water, sediment, or particulates that interfere with visual transmission). Compatible samples include mineral oils, turbine oils, hydraulic fluids, transformer oils, diesel fuel, kerosene, and naphtha fractions. It is not intended for opaque, highly viscous, or fluorescent samples. The instrument satisfies method validation requirements for GLP and GMP-regulated environments when used within documented SOPs; its manual operation supports full audit trail documentation per FDA 21 CFR Part 11 if integrated into electronic lab notebook (ELN) workflows. All color filters are supplied with individual calibration certificates referencing CIE 1931 colorimetric coordinates and luminance values measured under CIE Standard Illuminant A.

Software & Data Management

The TP692 is a fully standalone, non-digital instrument—no embedded firmware, touchscreen interface, or data export capability is included. This design eliminates cybersecurity risks, software validation overhead, and obsolescence concerns associated with proprietary platforms. Color determinations are recorded manually in laboratory notebooks or LIMS-compatible spreadsheets using standardized reporting formats (e.g., “ASTM D1500: 3.0”, “SH/T 0168: 18”). For labs requiring digital traceability, optional integration includes barcode-scanned sample ID entry via external tablet, timestamped photo documentation of the matched color position, and structured CSV output from custom ELN templates aligned with ISO 17025 clause 7.7 (result reporting). No firmware updates or license renewals are required over the instrument’s service life.

Applications

• Routine quality control of finished lubricants prior to shipment, verifying conformance to internal specifications or OEM technical data sheets (e.g., API SP, ACEA C6)
• Monitoring thermal oxidation stability during accelerated aging tests (e.g., ASTM D2896, D943) via progressive darkening trends
• Batch-to-batch consistency checks in refinery blending operations for jet fuel (Jet A-1 per ASTM D1655) and diesel (EN 590)
• Regulatory submission support for EPA, CNPC, or Sinopec compliance dossiers requiring ASTM D1500 color data
• Educational use in petroleum engineering curricula to demonstrate classical visual metrology principles and method limitations
• Reference instrument for cross-calibrating automated colorimeters or validating spectrophotometric color predictions (e.g., CIELAB ΔE*ab vs. ASTM units)

FAQ

Does the TP692 require annual recalibration?
No—calibration is inherent to the certified color glass filters. Users perform periodic verification using the blank position and documented reference samples per ASTM D1500 Section 8.2. Full recalibration is only necessary if filters are damaged or replaced.
Can the TP692 measure beyond ASTM D1500’s 0.5–8.0 range?
Yes—the 26-position disc includes an extended 1–25 scale aligned with SH/T 0168, enabling assessment of darker industrial oils not covered by ASTM D1500, though such results are not directly convertible to ASTM units.
Is the light source replaceable, and what is its rated lifetime?
Yes—the frosted incandescent lamp (Type: G13 base, 220 V, 60 W) is user-replaceable. Typical operational lifetime exceeds 1,000 hours under standard lab usage conditions.
What environmental conditions must be maintained during testing?
Testing must occur in a draft-free, temperature-controlled room (5–40 °C), with ambient lighting subdued to prevent glare or chromatic adaptation effects. Relative humidity should remain ≤85% to avoid condensation on optical surfaces.
How is operator variability addressed in method validation?
Per ASTM D1500 Section 9.2, laboratories must establish intra- and inter-operator reproducibility limits using ≥5 trained analysts and ≥10 replicate measurements. The TP692’s adjustable eyepiece and uniform illumination minimize systematic bias, supporting RSD ≤5% at color number 4.0 under controlled conditions.