LAUDA Viscotemp 15/24 Precision Constant-Temperature Bath for Kinematic Viscosity Testing

Overview

The LAUDA Viscotemp 15/24 is a high-precision, laboratory-grade constant-temperature bath engineered specifically for kinematic viscosity measurements in accordance with ASTM D445, ISO 3104, and IP 71 standards. It operates on the principle of precise thermal equilibrium maintenance within a thermally homogeneous fluid medium—typically water, silicone oil, or LAUDA’s certified Therm 180 heat transfer fluid—to ensure consistent sample temperature during capillary flow time measurement. Its design centers on metrological integrity: the bath achieves ±0.01 °C temperature stability across its full 0–105 °C operating range, enabling reliable determination of viscosity index (VI) for lubricants, solution viscosity of polymers (e.g., PA6 in concentrated sulfuric acid), and other Newtonian/non-Newtonian fluid characterizations where thermal drift directly impacts timing accuracy and repeatability.

Key Features

• Corrosion-resistant electropolished stainless steel bath chamber with integrated optical-grade borosilicate glass viewport—enabling real-time visual monitoring of capillary tubes or automated viscometers without compromising structural integrity or thermal performance.
• Adjustable internal circulation pump with six discrete flow-rate settings (0.5–8.0 L/min), optimized to minimize thermal gradients while avoiding turbulence-induced vibration at the viscometer mounting interface.
• High-resolution digital controller with 0.01 K resolution, intuitive cursor-driven soft-key navigation, and auto-calibration routine traceable to NIST-certified reference sensors.
• Modular station configuration: Viscotemp 15 accommodates up to four manual Ubbelohde/Ostwald capillary viscometers, two iVisc intelligent viscometry stations, or two S5 automated viscometers; Viscotemp 24 scales to seven manual positions or four automated stations—both support optional VRM 4 robotic cleaning module for solvent-based residue removal between runs.
• Therm 180-compatible operation: When filled with LAUDA Therm 180 synthetic heat transfer fluid (flash point >200 °C, thermal stability to 220 °C), the bath functions as a chemically inert, non-oxidizing environment suitable for aggressive dissolution protocols—including polyamide (PA6/PA66) dissolution in fuming sulfuric acid per ISO 307.

Sample Compatibility & Compliance

The Viscotemp 15/24 supports all standard capillary viscometers conforming to ASTM D445 Annex A1–A5 and ISO 3104 Table 1 geometries. Its uniform temperature field (≤0.02 °C spatial deviation across bath volume, verified per DIN EN ISO/IEC 17025 calibration protocol) ensures compliance with GLP and GMP documentation requirements for viscosity testing in QC laboratories. The system is compatible with third-party automated viscometry platforms requiring stable thermal anchoring, including Cannon Instrument Company’s SVM series and Anton Paar’s AMVn units. All firmware and control logic are designed to meet IEC 61000-6-2/6-4 EMC standards and CE marking requirements for laboratory instrumentation in the EU.

Software & Data Management

While the Viscotemp 15/24 operates as a standalone analog-controlled thermal platform, it integrates seamlessly with LAUDA’s optional ViscoLink software suite via RS232/USB interface. ViscoLink provides time-stamped temperature logging (1 Hz sampling), automated pass/fail validation against user-defined stability thresholds (e.g., “hold at 40.00 ±0.01 °C for ≥15 min”), and export-ready CSV reports compliant with FDA 21 CFR Part 11 audit trail requirements—including operator ID, parameter changes, and calibration event history. Raw temperature data can be synchronized with external viscometer timing signals to reconstruct full viscosity calculation workflows traceable to ISO/IEC 17025 Clause 7.7.

Applications

• Kinematic viscosity and viscosity index (VI) determination of mineral and synthetic engine oils per ASTM D2270 and ISO 2909.
• Solution viscosity testing of thermoplastics—including polystyrene (PS), poly(methyl methacrylate) (PMMA), and polyamide (PA) grades—in sulfuric acid, formic acid, or phenol-based solvents.
• Calibration and verification of capillary viscometers used in pharmaceutical excipient QC (e.g., cellulose derivatives per USP ) and polymer additive formulation labs.
• Long-duration thermal stability studies requiring uninterrupted 72+ hour operation at elevated temperatures (e.g., 90–105 °C) with minimal drift.
• Method development for new ASTM or ISO viscosity test procedures requiring custom thermal ramp profiles and multi-point equilibration validation.

FAQ

Can the Viscotemp 15/24 operate with organic solvents such as toluene or xylene?

Yes—when configured with Therm 180 fluid and appropriate chemical-resistant seals, the bath is rated for use with common aromatic and chlorinated solvents. Consult LAUDA’s Chemical Compatibility Guide (Ref. DOC-VT-CCG-2023) prior to solvent selection.
Is external cooling required to reach 0 °C?

No—the integrated Peltier-assisted chiller module enables sub-ambient operation down to 0 °C without external refrigeration units.
Does the system support IQ/OQ/PQ documentation packages?

Yes—LAUDA provides factory-issued IQ/OQ protocols aligned with ISO 9001 and ISO/IEC 17025, plus customizable PQ templates for site-specific validation under GxP environments.
What maintenance intervals are recommended for the VRM 4 cleaning module?

The VRM 4 requires quarterly inspection of nozzle integrity and monthly replacement of solvent filters when operating in high-residue applications (e.g., heavy fuel oil testing).
How is temperature uniformity validated across the bath volume?

LAUDA performs volumetric mapping using nine calibrated Pt100 probes per DIN EN ISO/IEC 17025 before shipment; a certificate of uniformity (±0.02 °C max deviation) is included with each unit.