Chengmeng NDJ-5ST Advanced Rotational Viscometer with Color TFT Display

Overview

The Chengmeng NDJ-5ST Advanced Rotational Viscometer is a benchtop, microprocessor-controlled instrument engineered for precision measurement of dynamic viscosity in both Newtonian and non-Newtonian fluids. It operates on the principle of rotational viscometry—applying controlled shear stress via a rotating spindle immersed in the sample, then measuring the resulting torque to calculate absolute or apparent viscosity (in mPa·s). Its design adheres to fundamental rheological standards including ASTM D2196 and ISO 2555, making it suitable for routine quality control, formulation development, and process consistency verification in regulated industrial laboratories.

Key Features

• High-resolution 3.5-inch IPS color TFT display providing real-time visualization of viscosity, rotational speed, sample temperature, % torque, spindle identification, and maximum measurable viscosity for the selected spindle/speed combination
• Four preset rotational speeds (6, 12, 30, 60 rpm) optimized for rapid screening and comparative analysis across diverse fluid classes
• Integrated PT1000A temperature probe with 0.1 °C resolution and ±0.1 °C accuracy—critical for temperature-dependent viscosity profiling per ASTM D445 and ISO 3104
• Standard L-type spindles (#1–#4) covering a calibrated range from 10 to 100,000 mPa·s; optional #0 spindle extends low-viscosity capability down to 1 mPa·s
• Dual measurement modes: manual single-point acquisition and timed measurement mode for stability assessment over defined intervals
• Onboard data storage for up to 50 viscosity records, each timestamped and tagged with spindle, speed, temperature, and torque values
• Robust mechanical architecture with 250 mm vertical lift travel, enabling precise immersion depth control and consistent meniscus alignment per ISO 3219

Sample Compatibility & Compliance

The NDJ-5ST is validated for use with homogeneous liquids and stable dispersions exhibiting minimal particle settling during measurement—including lubricating oils, polymer solutions, pharmaceutical suspensions, food emulsions, architectural coatings, and adhesive formulations. Its fixed-speed operation ensures reproducible shear history, supporting compliance with internal SOPs and external frameworks such as USP , ISO/IEC 17025, and GMP Annex 11 documentation requirements. While not certified for FDA 21 CFR Part 11 out-of-the-box, its RS-232 and USB interfaces support integration into validated LIMS or ELN environments where audit trails and electronic signatures are implemented at the system level.

Software & Data Management

Data export is supported via USB mass storage mode (CSV format) or RS-232 serial transmission to third-party software platforms—including Excel-based QC dashboards, LabVIEW automation scripts, or enterprise-grade laboratory information management systems (LIMS). The instrument firmware supports bilingual UI switching (English/Chinese), facilitating multilingual team operations without hardware modification. All stored measurements retain full metadata: date/time stamp, spindle ID, rotational speed, measured temperature, torque percentage, and calculated viscosity—enabling traceable trend analysis and deviation investigation in accordance with ISO 17025 clause 7.7.

Applications

• Quality assurance of incoming raw materials (e.g., resin viscosity prior to polymerization, solvent purity verification)
• In-process monitoring of batch homogeneity in paint and ink manufacturing
• Stability evaluation of topical pharmaceutical gels and ointments under accelerated storage conditions
• Rheological fingerprinting of food thickeners (xanthan, guar gum) across temperature gradients
• Viscosity grading of edible oils and biodiesel blends per ASTM D445 specifications
• Educational demonstration of shear-thinning behavior in non-Newtonian systems (e.g., ketchup, toothpaste)

FAQ

What spindle configuration is required to measure a sample with viscosity below 10 mPa·s?
For accurate measurement in the 1–100 mPa·s range, the optional #0 spindle must be installed. This spindle is not included standard but is available as an accessory.

Is temperature control integrated into the NDJ-5ST unit?
No—the instrument includes a high-accuracy PT1000A temperature probe for ambient sample monitoring only. External water baths or Peltier-controlled sample holders are recommended for active temperature regulation.

Can the NDJ-5ST perform yield stress estimation?
No—this model implements constant-shear-rate (CSR) measurement only and does not support ramped or oscillatory protocols required for yield value determination.

How is calibration verified on this instrument?
Calibration is performed using NIST-traceable silicone oil standards (e.g., Cannon N47, N100) at specified temperatures and speeds. Users should maintain a calibration log documenting standard lot numbers, dates, and observed deviations per ISO/IEC 17025 clause 6.6.

Does the device support GLP-compliant data integrity practices?
Yes—when used with documented procedures, audit-ready output files, and controlled access to USB/RS-232 export functions, the NDJ-5ST supports core GLP principles including data traceability, instrument identification, and environmental condition logging.