SETA KV-6 Kinematic Viscosity Tester

Overview

The SETA KV-6 Kinematic Viscosity Tester is a precision-engineered, fully compliant laboratory instrument designed for the accurate and reproducible determination of kinematic viscosity in petroleum products, lubricants, fuels, and related hydrocarbon-based fluids. It operates on the principle of capillary flow time measurement under gravity, in strict accordance with internationally recognized standard test methods—including ASTM D445, ISO 3105, IP 71, EN 12595, and GB/T 265. The instrument utilizes a constant-temperature bath system that maintains thermal equilibrium across multiple U-tube viscometers simultaneously, enabling high-throughput, multi-sample analysis while preserving metrological integrity. Its architecture integrates passive thermal mass design, forced-circulation fluid dynamics, and digital PID temperature control to ensure long-term stability and spatial uniformity—critical requirements for viscosity determinations where ±0.01°C deviations can introduce measurable bias in flow-time measurements.

Key Features

• Six independent capillary viscometer positions, supporting parallel testing of multiple samples or replicates per run
• 50-liter thermostatically controlled silicone oil bath with optimized flow distribution and minimized thermal gradients
• Digital temperature display with 0.01°C resolution and programmable setpoint accuracy validated per ASTM E77 and ISO/IEC 17025 calibration protocols
• Front-access tempered glass panel providing unobstructed visual monitoring of capillary flow events without compromising operator safety or thermal insulation
• Temperature range spanning ambient to 150°C, accommodating low-viscosity naphthas through high-viscosity bitumens and residual fuel oils
• Optional scattering backlight module for enhanced contrast during manual timing of meniscus passage—particularly beneficial for dark or opaque samples per ASTM D446 guidelines
• Robust stainless-steel and anodized aluminum construction, rated for continuous operation in ISO Class 8 (100,000) cleanroom-adjacent laboratory environments

Sample Compatibility & Compliance

The KV-6 accommodates standard Ubbelohde, Cannon-Fenske, and BS/IP-type capillary viscometers (e.g., ASTM D445 Type I–IV, ISO 3105 Group 1–4). It supports sample volumes from 10 mL to 25 mL per tube and is compatible with transparent, translucent, and moderately opaque liquids—including diesel, jet fuel, transformer oil, hydraulic fluid, and crude assay fractions. All operational parameters comply with regulatory and quality assurance frameworks: data traceability meets FDA 21 CFR Part 11 requirements when paired with validated third-party timing software; thermal performance is verified against ISO/IEC 17025-accredited reference standards; and mechanical design conforms to IEC 61010-1 for electrical safety in laboratory instrumentation.

Software & Data Management

While the KV-6 operates as a standalone analog/digital hybrid platform, it interfaces seamlessly with external timing systems—including photometric sensors (e.g., SETA ViscoTimer Pro), stopwatch synchronization modules, and LIMS-integrated data acquisition units. Raw flow-time data may be exported via RS-232 or USB-C to spreadsheet or statistical process control (SPC) platforms. When used with compliant timing peripherals, the system supports full audit trails, user access controls, electronic signatures, and version-controlled calibration records—enabling adherence to GLP, GMP, and ISO 9001 quality management systems. Firmware updates are distributed exclusively through SETA’s authorized service network and require cryptographic authentication.

Applications

• Quality control of finished petroleum products per ASTM D975 (diesel), D1655 (jet fuel), and D3607 (gasoline)
• Refinery process monitoring of vacuum gas oil (VGO), lubricant base stocks, and asphalt feedstocks
• Research-grade viscosity-temperature profiling (VTF) for developing predictive models under ASTM D341 and ISO 2909
• Regulatory submission testing for EPA Tier 3 compliance, EU REACH registration dossiers, and API licensing documentation
• Third-party certification laboratories performing accredited viscosity testing to ISO/IEC 17025 scope requirements

FAQ

Does the KV-6 include built-in timing functionality?
No—the instrument provides precise thermal control only. Timing must be performed externally using calibrated stopwatches, photometric sensors, or automated timing modules.
Can the bath accommodate non-silicone heat transfer fluids?
Only silicone-based oils meeting ASTM D445 Annex A1 specifications are recommended; substitution with glycols or mineral oils may compromise thermal uniformity and void warranty.
Is the KV-6 suitable for biodiesel (FAME) viscosity testing?
Yes—provided samples meet ASTM D6751 purity criteria and are pre-filtered to ≤5 µm to prevent capillary clogging.
What maintenance intervals are specified for the temperature control system?
Bath fluid level and clarity should be inspected daily; full fluid replacement and PID recalibration are required every 12 months or after 2,000 operating hours, whichever occurs first.
How is traceability established for temperature calibration?
SETA supplies NIST-traceable calibration certificates for the integrated Pt100 sensor, valid for 12 months from date of installation by authorized service personnel.