ZiQi NDJ-1 Mechanical Analog Rotational Viscometer

Overview

The ZiQi NDJ-1 Mechanical Analog Rotational Viscometer is a precision-engineered benchtop instrument designed for routine viscosity measurement of Newtonian and near-Newtonian liquids in quality control, production, and educational laboratory environments. Based on the Couette principle, it employs a rotating spindle immersed in the sample fluid; torque resistance generated by viscous drag is mechanically transmitted to a calibrated analog dial, providing direct readout of dynamic viscosity in millipascal-seconds (mPa·s). Unlike digital or microprocessor-controlled viscometers, the NDJ-1 relies on a robust mechanical torsion-spring system and gear-driven speed selection—offering inherent stability, minimal electronic dependency, and long-term repeatability without software calibration drift. Its design prioritizes operational transparency and tactile feedback, making it especially suitable for training technicians, validating batch consistency in non-regulated settings, and performing rapid pass/fail checks where traceable digital logging is not required.

Key Features

• Mechanical analog display with high-contrast pointer and dual-scale dial (logarithmic and linear), enabling intuitive interpretation without power-up delay or interface navigation.
• Four standard spindles (#1–#4) covering mid-range viscosity (10–100,000 mPa·s); optional #0 spindle extends low-end capability down to 0.1 mPa·s for thin solvents, aqueous solutions, and low-viscosity oils.
• Fixed-speed motor drive with four discrete rotational settings (6, 12, 30, and 60 rpm), optimized for steady-state shear rate application under controlled temperature conditions.
• Benchtop fixed-mount architecture with stable aluminum alloy base and vertical column assembly—designed to minimize vibration coupling and ensure consistent spindle immersion depth.
• No firmware, no batteries, no USB or network interfaces—reducing maintenance overhead and eliminating cybersecurity or software obsolescence concerns.
• Compliant with basic mechanical metrology practices per ISO 2555 and ASTM D2196 for rotational viscometry, supporting manual recordkeeping aligned with GLP documentation workflows.

Sample Compatibility & Compliance

The NDJ-1 accommodates a broad spectrum of industrial and research-grade fluids—including edible oils, polymer solutions, pharmaceutical suspensions, architectural paints, adhesives, and cosmetic emulsions—provided samples are homogeneous, free of abrasive particles, and maintained at stable ambient temperature (±0.5°C) during measurement. While not validated for FDA 21 CFR Part 11 compliance due to its analog output, the instrument supports audit-ready manual data entry when used within documented SOPs that specify spindle selection, rotational speed, equilibration time (>60 s), and environmental monitoring. It meets CE marking requirements for electrical safety (EN 61010-1) and electromagnetic compatibility (EN 61326-1) as supplied for use in EU-aligned laboratories.

Software & Data Management

The NDJ-1 operates independently of proprietary software. All measurements are recorded manually into lab notebooks or LIMS-compatible spreadsheets. Users may digitize readings using standardized templates aligned with ISO/IEC 17025 clause 7.5.2 (recording of results). For facilities requiring electronic records, third-party optical character recognition (OCR) tools or document-scanning protocols can be integrated into existing QA/QC workflows without modifying the instrument. No drivers, SDKs, or firmware updates are provided or required.

Applications

• Batch release testing of lubricating oils and transformer fluids in maintenance labs.
• Consistency verification of paint and ink formulations during R&D and production.
• Viscosity grading of food-grade syrups, sauces, and dairy products per internal specifications.
• Educational demonstration of Newtonian flow behavior and shear-dependent resistance in undergraduate physics and chemical engineering curricula.
• Field-deployable viscosity screening in mobile QC units where electrical infrastructure is limited.
• Baseline characterization of solvent-based coatings prior to rheological profiling with advanced rotational rheometers.

FAQ

Is the NDJ-1 suitable for non-Newtonian fluid characterization?
No—it provides single-point viscosity values at fixed shear rates and does not support shear-rate sweeps, yield stress determination, or thixotropy analysis.
Can I calibrate the NDJ-1 in-house?
Yes, using NIST-traceable silicone oil standards (e.g., Cannon–Fenske certified reference fluids) and following the manufacturer’s mechanical zero-adjustment and full-scale verification procedure.
What spindle should I use for measuring honey?
Start with #3 or #4 spindle at 6 rpm; adjust downward in speed or upward in spindle number if pointer deflection falls outside the 20–90% scale range.
Does the instrument include temperature control?
No—temperature regulation must be achieved externally via water baths or Peltier plates; viscosity values are only valid when sample temperature is monitored and reported alongside each reading.
Is technical support available outside China?
Distributor-level service and spare parts (spindles, calibration oils, drive belts) are available through authorized regional partners in Southeast Asia, the Middle East, and Latin America; English-language operation manuals and calibration guides are included with shipment.