Erichsen #243 Viscometer Cup

Overview

The Erichsen #243 Viscometer Cup is a precision-engineered efflux viscometer designed for rapid, repeatable kinematic viscosity measurements of low-to-medium viscosity Newtonian liquids in laboratory and industrial quality control environments. Based on the standardized orifice efflux principle—where viscosity is derived from the time required for a fixed volume of fluid to drain through a calibrated orifice under gravity—the #243 cup conforms to internationally recognized test methods including ISO 2431, ASTM D1200, DIN 53211, and BS 3900 Part 6. Its operation relies on gravitational flow dynamics and assumes laminar, steady-state discharge; therefore, it is strictly intended for Newtonian fluids exhibiting linear shear stress–shear rate relationships. Non-Newtonian materials—including pastes, gels, and highly thixotropic systems—are excluded from valid measurement per method specifications.

Key Features

• Modular orifice configuration: Interchangeable stainless steel orifices (2 mm, 4 mm, 6 mm, and 8 mm diameters) enable optimized range selection across kinematic viscosity intervals from ~10 to >1,000 mm²/s, depending on cup variant and temperature.
• Material integrity: Standard #243/II and #243/VII cups are fabricated from aerospace-grade anodized aluminum, providing dimensional stability, corrosion resistance, and thermal uniformity; #243/I variants utilize phenolic resin for cost-sensitive applications while retaining stainless steel orifices for wear resistance and flow consistency.
• Controlled geometry: Precision-machined cup cavity, defined meniscus rim, and integrated overflow trough ensure reproducible sample loading volume and eliminate edge effects during efflux timing.
• Traceable metrology: Optional factory calibration certificates—issued by Erichsen’s in-house DKD-accredited laboratory (DAkkS-certified)—document orifice diameter tolerance (±0.005 mm), cup volume (±0.5 mL), and certified efflux times against NIST-traceable reference oils.
• Thermal management compatibility: Designed for integration with thermostatic jackets (e.g., model 0209 series) enabling controlled viscosity testing at standard temperatures (23 °C, 25 °C, 40 °C) per ISO 3219 and ASTM D445 requirements.

Sample Compatibility & Compliance

The #243 cup is validated for use with transparent or translucent Newtonian liquids such as solvents, mineral oils, varnishes, lacquers, thin resins, and aqueous polymer solutions. It is not suitable for opaque suspensions, high-solids dispersions, or non-Newtonian fluids where shear-dependent viscosity invalidates efflux time–viscosity correlation. Compliance documentation supports audit readiness under GLP and GMP frameworks: all DKD-certified units include full traceability to national standards, uncertainty budgets, and certificate validity periods. The device meets mechanical and dimensional requirements outlined in ISO/IEC 17025 for accredited calibration laboratories.

Software & Data Management

While the #243 cup operates as a manual, analog instrument requiring external timing devices, its data output integrates seamlessly into digital QA/QC workflows. When paired with a calibrated digital stopwatch (e.g., Erichsen 560911241) and temperature sensor (570911341), results comply with FDA 21 CFR Part 11 requirements when recorded within validated electronic lab notebooks (ELNs) or LIMS platforms supporting audit trails, user authentication, and electronic signatures. Erichsen provides template SOPs for viscosity determination—including operator qualification, environmental monitoring (temperature/humidity logs), and calibration interval management—to facilitate regulatory submissions and internal audits.

Applications

• Coating & Ink Manufacturing: Rapid batch verification of solvent-based and waterborne formulations prior to filtration and filling.
• Petrochemical QC Labs: Screening of base oils, hydraulic fluids, and light fuel fractions per ASTM D1200 protocols.
• Adhesives & Sealants R&D: Comparative viscosity profiling during resin synthesis and diluent optimization.
• Academic Teaching Labs: Hands-on instruction in rheological fundamentals, Newtonian behavior validation, and ISO-standardized test methodology.
• Paint & Varnish Production: In-line viscosity checks aligned with DIN 53211 for gloss control and spray application consistency.

FAQ

What standards does the Erichsen #243 cup comply with?
It is designed and verified per ISO 2431, ASTM D1200, DIN 53211, BS 3900-6, and JIS Z 8803.
Can the #243 cup measure non-Newtonian fluids?
No—it is strictly intended for Newtonian liquids. Non-Newtonian behavior introduces shear-rate dependence that invalidates efflux time–viscosity conversion.
Is DKD calibration mandatory for ISO 9001 compliance?
Not mandatory, but strongly recommended for auditable traceability; DKD certification satisfies ISO/IEC 17025 requirements for accredited calibration.
How often should the cup be recalibrated?
Annually under routine use; more frequently if exposed to abrasive solvents, mechanical impact, or elevated temperatures exceeding 60 °C.
What accessories are essential for compliant operation?
A calibrated digital stopwatch (±0.01 s resolution), certified thermometer (±0.1 °C), leveling stand with glass plate (0158.01.32), and thermostatic jacket (0209 series) for temperature-controlled testing.