HAAKE VT1 Plus & VT2 Plus Portable Rotational Viscometers

Overview

The HAAKE VT1 Plus and VT2 Plus are compact, battery-powered rotational viscometers engineered for field-deployable and on-site viscosity assessment in industrial quality control, R&D laboratories, and production environments where access to mains power is limited or impractical. Based on the Couette principle, these instruments measure dynamic viscosity by rotating a precisely machined spindle (rotor) at a fixed speed of 62.5 rpm within the test fluid; torque resistance generated by the fluid’s internal friction is converted into a digital viscosity reading. Unlike analog dial-based predecessors, the VT1/2 Plus series eliminates parallax and interpolation errors through a high-contrast LCD display that presents real-time viscosity values in SI units (mPa·s or dPa·s), along with system status alerts—such as low battery, rotor mismatch, or thermal overload—ensuring measurement integrity without operator interpretation.

Key Features

• Battery-operated design (4 × AA cells included) enables true portability—no AC adapter required for routine measurements
• Single-button interface: one press powers on/off; second press selects rotor configuration and initiates measurement—minimizing training time and procedural variability
• Digital LCD display provides direct readout of viscosity, unit confirmation, rotor ID, and diagnostic messages—including error codes for out-of-range conditions or calibration drift
• Two model variants optimized for distinct dynamic ranges: VT1 Plus (1.5–330 mPa·s) for low-viscosity fluids (e.g., solvents, coatings, inks); VT2 Plus (0.3–4000 dPa·s) for medium-to-high viscosity materials (e.g., adhesives, pastes, polymer melts)
• Robust mechanical architecture compliant with IP54-rated ingress protection against dust and splashing water—suitable for workshop and plant-floor use
• Factory-calibrated per ISO 17025-accredited procedures; optional traceable calibration kit (NIST-traceable standards) available for ±1% FSD accuracy validation under GLP/GMP-aligned workflows

Sample Compatibility & Compliance

The VT1/2 Plus accommodates Newtonian and mildly non-Newtonian samples across diverse sectors including paints & coatings, food & beverage, pharmaceuticals, and chemical manufacturing. Its fixed-speed operation ensures consistent shear rate application (γ̇ ≈ 125 s⁻¹ for standard spindles), enabling comparative QC checks aligned with ASTM D2196 and ISO 2555. While not intended for full rheological profiling (e.g., flow curves or yield stress determination), its repeatability of ±1% FSD meets typical in-process verification requirements. The instrument operates safely up to 150 °C with optional high-temp rotor kits (not included), supporting hot-melt adhesive and thermoplastic resin evaluation. All firmware and hardware comply with CE marking directives (EMC 2014/30/EU, RoHS 2011/65/EU) and support audit-ready documentation per FDA 21 CFR Part 11 when integrated with Thermo Fisher’s optional data logging software.

Software & Data Management

While standalone operation requires no software, optional connectivity via USB-to-serial adapter enables integration with Thermo Fisher’s HAAKE Viscotester PC Software (v3.2+). This platform supports automated data export to CSV or Excel, timestamped measurement logs with operator ID tagging, statistical process control (SPC) charting, and electronic signature capture for regulated environments. Audit trails record all parameter changes, calibration events, and user actions—fully satisfying ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) for GLP and GMP compliance. No cloud dependency: all data remains local unless explicitly exported.

Applications

• On-line batch release testing of industrial lubricants and transformer oils (ASTM D445 alignment)
• QC screening of paint viscosity pre-application to ensure sprayability and film uniformity
• Rapid assessment of syrup, jam, or dairy product consistency during food processing
• Verification of cleaning solution viscosity in pharmaceutical CIP systems
• Field validation of grease consistency prior to equipment re-lubrication
• Educational labs requiring robust, low-maintenance instrumentation for undergraduate rheology fundamentals

FAQ

What is the difference between VT1 Plus and VT2 Plus?
The VT1 Plus is calibrated for lower-viscosity ranges (1.5–330 mPa·s), while the VT2 Plus extends to higher viscosities (0.3–4000 dPa·s) and includes compatibility with optional high-accuracy calibration kits.
Can I use the instrument above ambient temperature?
Yes—standard rotors are rated to 150 °C; however, high-temperature operation requires compatible thermal shielding and rotor selection (sold separately).
Is the device suitable for non-Newtonian fluids?
It provides reliable comparative readings for mildly shear-thinning or thixotropic samples under fixed-shear-rate conditions, but does not characterize full flow behavior.
How often should calibration be performed?
Annual recalibration is recommended; more frequent verification using certified reference oils is advised for critical applications or after mechanical shock.
Does it meet regulatory requirements for pharmaceutical manufacturing?
When used with validated calibration protocols and paired with compliant data management software, it supports adherence to USP , EP 2.9.35, and FDA 21 CFR Part 11 expectations for viscosity testing in QC environments.