Koehler K16591 Automated Closed-Cup Flash Point Tester
| Brand | Koehler |
|---|---|
| Origin | USA |
| Model | K16591 |
| Test Method Compliance | ASTM D3278, D3828, D4206 |
| Temperature Range | –30°C to +300°C |
| Sample Volume | 2 mL |
| Test Duration | ~60 seconds |
| Cup Material | Anodized Aluminum |
| Configuration | Closed-Cup |
| Certification | CE, UL Listed |
| Regulatory Alignment | Supports GLP/GMP audit trails and 21 CFR Part 11-compliant data integrity workflows |
Overview
The Koehler K16591 Automated Closed-Cup Flash Point Tester is a precision-engineered instrument designed for rapid, repeatable determination of the flash point of volatile liquids in accordance with globally recognized safety and regulatory standards. Utilizing the equilibrium closed-cup method—based on thermally controlled vapor-phase ignition detection—the K16591 measures the lowest temperature at which vapors above a liquid sample ignite momentarily when exposed to an ignition source under standardized atmospheric conditions. This principle aligns directly with ASTM D3828 (Small Scale Closed-Cup), ASTM D3278 (Tag Closed-Cup), and ISO 9038, ensuring compatibility with petroleum refining, chemical manufacturing, transportation safety assessment, and regulatory submission requirements. The system operates across a wide thermal range (–30°C to +300°C), enabling characterization of low-volatility solvents, high-boiling hydrocarbons, and formulated products such as coatings, fragrances, and industrial cleaners—without manual intervention or operator-dependent timing.
Key Features
- Fully automated test sequence—from sample introduction and heating ramp to ignition detection and result reporting—minimizing human error and enhancing inter-laboratory reproducibility.
- Integrated Peltier cooling and high-efficiency resistive heating enable precise temperature control within ±0.1°C across the full operational range.
- Optically isolated flame detection system with dual-wavelength IR sensors ensures unambiguous identification of momentary vapor ignition, eliminating false positives from background thermal radiation.
- Anodized aluminum test cup (included) provides rapid thermal equilibration, corrosion resistance, and compliance with ASTM-specified geometry and surface finish requirements.
- Front-panel touchscreen interface with embedded firmware supports standalone operation; optional Ethernet/USB connectivity enables remote monitoring and integration into LIMS environments.
- Self-diagnostic routines verify sensor calibration, cup seal integrity, and ignition source functionality prior to each test cycle—ensuring data validity per ISO/IEC 17025 quality management expectations.
Sample Compatibility & Compliance
The K16591 accommodates a broad spectrum of liquid samples including crude oil fractions, diesel fuels, jet fuels (Jet A, JP-8), lubricating oils, paint thinners, fragrance concentrates, and halogenated solvents. Its 2 mL sample requirement reduces hazardous material handling exposure while maintaining statistical confidence in results. As a closed-cup tester, it is explicitly validated for flash point determination in safety classification (e.g., UN GHS Category 1–4), transport regulation (DOT 49 CFR 173.115, IATA Packing Instructions), and process hazard analysis (OSHA 1910.1200). All test reports include traceable metadata: ambient pressure, calibration certificate ID, operator ID, timestamp, and pass/fail status against defined acceptance criteria—supporting auditable compliance with FDA 21 CFR Part 11, EU Annex 11, and GLP documentation standards.
Software & Data Management
The instrument ships with Koehler FlashPoint Manager™ v4.x software, a Windows-based application supporting method setup, real-time test visualization, batch report generation (PDF/CSV), and electronic signature capture. Audit trail functionality records all user actions—including parameter edits, calibration events, and result overrides—with immutable timestamps and operator authentication. Data export conforms to ASTM E1394 and ASTM E1461 standards for analytical instrument interoperability. When deployed in regulated environments, the system supports role-based access control, encrypted database storage, and periodic integrity verification—fully aligned with ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) data governance principles.
Applications
- Quality control laboratories verifying flash point specifications for incoming raw materials and finished petroleum products.
- HSE departments conducting flammability hazard assessments for solvent-based formulations prior to scale-up or shipment.
- Contract testing facilities generating regulatory submission dossiers compliant with REACH, TSCA, and CLP regulations.
- Research groups studying thermal stability and vapor pressure behavior of novel bio-based solvents and ionic liquids.
- Refinery labs performing routine screening of distillate cuts during fractionation optimization studies.
FAQ
What standards does the K16591 support for flash point testing?
ASTM D3278, D3828, D4206; ISO 9038; DOT 49 CFR 173.115; and IATA Dangerous Goods Regulations.
Can the K16591 be used for open-cup testing?
No—the K16591 is configured exclusively for closed-cup methodology. For open-cup applications, Koehler offers the K16593 and K16594 models.
Is external calibration required before first use?
The unit ships with NIST-traceable factory calibration; however, users must perform initial verification using certified reference standards (e.g., n-decane, cyclohexane) per ASTM E203 or ISO 17025 internal procedure requirements.
Does the system support networked data export to LIMS?
Yes—via TCP/IP or USB, with configurable XML/CSV output templates compatible with major LIMS platforms including LabWare, STARLIMS, and Thermo Fisher SampleManager.
How often should the ignition source be replaced?
The quartz-halogen ignition filament is rated for ≥10,000 test cycles; replacement is recommended only upon diagnostic failure or after 24 months of continuous operation.
