ChemTron Dilution Viscometer Capillary Tube Set

Overview

The ChemTron Dilution Viscometer Capillary Tube Set (Model 53100) is a precision-engineered family of Ubbelohde-type dilution capillary viscometers designed for kinematic viscosity measurement of transparent Newtonian liquids in laboratory and quality control environments. Based on the fundamental principle of Poiseuille flow—where fluid viscosity is derived from the time required for a fixed volume of liquid to flow under gravity through a calibrated capillary tube—the system delivers high reproducibility and traceable results when used in accordance with ASTM D445, ISO 3104, and IP 71 standards. Unlike single-capillary viscometers, this set incorporates multiple interchangeable capillaries with precisely defined inner diameters (0.36 mm to 1.15 mm) and certified calibration constants (K = 0.001 to 0.1 mm²/s), enabling optimal range selection for samples spanning 0.3–60 mm²/s. Its dilution-compatible design allows direct measurement of diluted polymer solutions or low-viscosity solvents without manual recalibration, supporting routine dilution series analysis per ASTM D2857 and ISO 1628-1.

Key Features

• Modular capillary tube configuration with seven standardized variants (e.g., 53100, 53103c, 53101a, 53110I, 53113Ic, 53120II), each laser-etched with unique identification and certified K-value
• Ubbelohde geometry ensures constant hydrostatic head during efflux, eliminating dependence on sample volume within the specified fill range (15–75 mL)
• Manufactured from borosilicate glass (DIN ISO 3585) with annealed joints and precision-drawn capillaries for thermal stability and long-term dimensional integrity
• Optimized for ambient-temperature operation (15–30 °C); compatible with standard thermostatic baths (±0.02 °C stability recommended)
• Integrated timing marks and reservoir geometry support unambiguous start/stop point definition per ISO 3104 protocol
• Designed for use with ChemTron AVS/SK-HT viscometer stands—rigid aluminum construction with adjustable leveling feet and universal tube clamping mechanism

Sample Compatibility & Compliance

The 53100 series is validated for transparent, particle-free, Newtonian liquids including hydrocarbon solvents, lubricating oils, jet fuels, glycerol/water mixtures, and diluted polymer solutions (e.g., polystyrene in toluene). Non-Newtonian or opaque samples require alternative instrumentation (e.g., rotational rheometers). All capillaries are supplied with individual calibration certificates traceable to national metrology institutes (PTB, NIST). The system fully supports GLP-compliant workflows: efflux time data can be recorded manually or integrated into LIMS via stopwatch synchronization; documentation meets audit requirements for ISO/IEC 17025-accredited laboratories. When operated within specified temperature tolerance and using certified reference oils (CRM 8501, CRM 8502), measurement uncertainty remains below ±0.35% (k=2) for kinematic viscosity.

Software & Data Management

While the 53100 is a manual, non-electronic instrument, it is engineered for seamless integration into digital QA/QC ecosystems. Efflux times are entered into ChemTron’s free ViscoCalc software (v3.2+), which applies the formula ν = K × t (where ν = kinematic viscosity in mm²/s, K = calibration constant, t = efflux time in seconds) and auto-generates ASTM D445-compliant reports—including temperature correction (ASTM D341), repeatability assessment, and outlier detection per ISO 5725-2. Raw data export (CSV, PDF) supports 21 CFR Part 11–ready systems when paired with validated electronic timers featuring audit trail functionality. Full validation documentation (IQ/OQ protocols) is available upon request for regulated pharmaceutical and petrochemical applications.

Applications

• Routine QC of base oils, transformer fluids, and aviation turbine fuels per ASTM D1655 and DEF STAN 91-91
• Determination of intrinsic viscosity in polymer characterization (ISO 1628-1, ASTM D2857)
• Viscosity grading of bitumen dilutions and cutback asphalts (ASTM D88, EN 12591)
• Educational labs for teaching fundamental rheological principles and capillary flow theory
• Reference method verification for online process viscometers in continuous blending operations

FAQ

What does “dilution-type” mean in this context?

It refers to the viscometer’s ability to maintain consistent K-value validity across varying sample concentrations—enabling direct measurement of serial dilutions without recalibration, critical for polymer molecular weight determination.
Is temperature control mandatory?

Yes. Kinematic viscosity is highly temperature-dependent; measurements must be performed in a thermostatically controlled bath stabilized to ±0.02 °C at the reference temperature (typically 40 °C or 100 °C per ASTM D445).
Can these capillaries be cleaned and reused?

Yes—provided proper solvent flushing (e.g., xylene for hydrocarbons, acetone for polar solvents) and nitrogen drying. Avoid ultrasonic cleaning or mechanical abrasion to preserve capillary geometry.
Do I need separate calibration for each capillary?

No. Each tube ships with its own certified K-value; no user calibration is required. However, periodic verification with certified reference oils is recommended every 6 months.
Is the AVS/SK-HT stand included with the 53100 set?

No—the stand is sold separately (Cat. No. AVS/SK-HT) and is required for stable vertical alignment and consistent meniscus observation during timing.