Shanghai Hengping NDJ-1 Rotational Viscometer
| [Brand | Hengping |
|---|---|
| Origin | Shanghai, China |
| Model | NDJ-1 |
| Viscosity Range | 1–1×10⁵ mPa·s |
| Rotors | No. 0 (optional), No. 1–4 |
| Speed Settings | 6, 12, 30, 60 rpm |
| Accuracy | ±5% for Newtonian fluids |
| Power Supply | 220 V ±10 V, 50 Hz |
| Dimensions (L×W×H) | 400×370×150 mm] |
Overview
The Shanghai Hengping NDJ-1 Rotational Viscometer is a mechanically driven, coaxial cylinder-type viscometer engineered for precision measurement of dynamic viscosity in Newtonian and near-Newtonian liquids. It operates on the principle of rotational drag torque measurement: a calibrated spindle rotates at fixed speeds within the sample, and the resulting viscous resistance is translated into torque, which is then converted to viscosity (mPa·s) using pre-defined calibration constants for each rotor and speed combination. Designed for laboratory and quality control environments, the NDJ-1 delivers repeatable, operator-independent results across a broad viscosity range — from low-viscosity solvents (1 mPa·s) to highly viscous pastes and polymer melts (up to 1×10⁵ mPa·s). Its robust mechanical architecture, minimal electronic dependency, and straightforward analog readout make it especially suitable for routine QC applications where long-term reliability, ease of maintenance, and compliance with standardized test protocols are prioritized.
Key Features
- Four fixed-speed motor drive: 6, 12, 30, and 60 rpm — enabling selection of appropriate shear rate for sample rheological behavior
- Five interchangeable spindles (rotors No. 0–4), with No. 0 rotor available as optional accessory for extended low-viscosity measurement down to 0.1 mPa·s
- Analog dial display with direct viscosity reading in mPa·s — no software dependency or calibration drift associated with digital signal processing
- Mechanically stable base and vertical alignment system ensuring consistent immersion depth and minimizing eccentricity-induced error
- Compliant with classical ASTM D2196 and ISO 2555 test methodologies for rotational viscosity determination under defined shear conditions
- Integrated leveling feet and sample cup positioning guide for reproducible setup across operators and shifts
Sample Compatibility & Compliance
The NDJ-1 is validated for use with homogeneous, non-volatile, non-aerated liquids exhibiting minimal time-dependent behavior (e.g., thixotropy or yield stress). Typical applications include solvent-based paints, mineral oils, edible oils, sugar syrups, cosmetic emulsions, pharmaceutical suspensions, and adhesive formulations. While not designed for yield-stress or viscoelastic characterization, its fixed-speed operation ensures compatibility with standard QC workflows requiring pass/fail assessment against specification limits. The instrument meets general requirements for GLP-compliant viscosity testing when used with documented procedures, traceable rotor calibration, and environmental controls (e.g., temperature-stabilized sample conditioning). When paired with Hengping’s CH-series constant-temperature baths (e.g., CH1006, CH2006), it supports temperature-controlled measurements per ASTM D445 and ISO 3104, with bath stability of ±0.05 °C in water or low-viscosity silicone oil.
Software & Data Management
The NDJ-1 operates as a standalone analog instrument without embedded firmware or digital connectivity. All measurements are manually recorded, supporting paper-based or LIMS-integrated data entry workflows. For laboratories requiring audit trails and electronic records, external documentation systems must be employed per FDA 21 CFR Part 11 guidelines — including operator identification, date/time stamps, rotor/speed selection, ambient and bath temperature logs, and raw dial readings. Calibration certificates for individual rotors (traceable to national standards) and periodic verification using certified viscosity standards (e.g., Cannon-Manning silicone oils) are essential for maintaining data integrity in regulated environments.
Applications
- Quality assurance of industrial lubricants and transformer oils per IEC 60296
- Batch release testing of food-grade syrups, sauces, and dairy products per ISO 11357-6
- Viscosity grading of architectural coatings and automotive refinish paints per ASTM D1200
- Stability monitoring of topical pharmaceutical gels and ointments during formulation development
- Educational demonstration of Newtonian fluid behavior in university physics and chemical engineering labs
- Raw material screening for polymer resins, adhesives, and ink vehicles prior to high-shear processing
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 continuous shear ramping, oscillatory testing, or yield stress determination.
Can rotor No. 0 be used with all speed settings?
Rotor No. 0 is optimized for 6 rpm only; higher speeds may exceed torque capacity and compromise accuracy at low viscosities.
What temperature control options integrate with the NDJ-1?
Hengping CH-series thermostatic baths (CH1006 to CH3006) offer internal/external circulation, PID-controlled stability (±0.05 °C), and compatible sample cup dimensions.
Does the instrument require annual recalibration?
Yes — rotor geometry, spring torsion, and dial linearity must be verified annually using NIST-traceable reference oils and documented per ISO/IEC 17025.
Is electrical safety certification provided for international markets?
The NDJ-1 complies with GB/T 28290 (Chinese national standard for viscometers); CE or UL certification requires third-party validation by the end-user’s regulatory team prior to deployment in EU or North America.
