POWEREACH NDJ-8S Digital Rotational Viscometer
| Brand | POWEREACH (Shanghai Zhongchen) |
|---|---|
| Origin | Shanghai, China |
| Instrument Type | Benchtop Rotational Viscometer |
| Viscosity Range | 1–2,000,000 mPa·s |
| Spindle Set | Standard #1–#4 spindles (optional #0 spindle for down to 0.1 mPa·s) |
| Speed Settings | 0.3, 0.6, 1.5, 3, 6, 12, 30, 60 rpm |
| Accuracy | ±2% for Newtonian fluids |
| Display | Backlit LCD with real-time spindle/speed/viscosity/% full-scale readout |
| Power Supply | AC 220 V ±10%, 50 Hz ±10% |
| Operating Environment | 5–35 °C, ≤80% RH |
| Dimensions | 370 × 325 × 280 mm |
| Net Weight | 6.8 kg |
Overview
The POWEREACH NDJ-8S Digital Rotational Viscometer is a precision benchtop instrument engineered for reliable measurement of absolute viscosity in Newtonian fluids and apparent viscosity in non-Newtonian fluids. Based on the Couette principle, it employs a motor-driven spindle rotating at precisely controlled speeds within the sample. The resulting viscous torque—proportional to fluid resistance—is detected by a high-stability sensor and converted into a digital viscosity value (mPa·s or cP) via embedded microprocessor signal processing. Unlike capillary or falling-ball viscometers, the NDJ-8S delivers direct, real-time shear-rate-dependent data across a broad dynamic range, making it suitable for routine QC, R&D screening, and process validation in industrial and academic laboratories. Its design adheres to fundamental rheological measurement conventions defined in ASTM D2196 and ISO 2555, ensuring compatibility with standardized reporting protocols.
Key Features
- Wide dynamic viscosity range: 1–2,000,000 mPa·s using standard #1–#4 spindles; extendable to 0.1 mPa·s with optional #0 spindle
- Eight discrete rotational speeds (0.3–60 rpm), enabling systematic shear-rate profiling for yield stress estimation and flow curve approximation
- Automatic spindle/speed pairing logic: instrument recommends optimal configuration based on preliminary reading stability and full-scale percentage
- Backlit high-contrast LCD display showing real-time spindle number, selected speed, measured viscosity, and % full-scale indication
- Integrated mechanical lifting column and adjustable base platform for precise sample depth control and reproducible immersion geometry
- Rugged aluminum alloy housing with ESD-safe surface finish, designed for long-term stability under continuous operation in ambient lab conditions
- No external PC required—fully self-contained operation with onboard calibration memory and non-volatile parameter storage
Sample Compatibility & Compliance
The NDJ-8S accommodates a broad spectrum of liquid and semi-liquid samples—including oils, resins, polymer melts, pharmaceutical suspensions, food emulsions, coatings, and cosmetic gels—provided they exhibit sufficient homogeneity and thermal stability at ambient temperature (5–35 °C). Sample volume requirements are consistent with ISO 3219: minimum 20 mL for #1 spindle, scaling up to ~400 mL for #4 spindle at low speeds. While not certified for GLP/GMP-regulated environments out-of-the-box, the instrument supports audit-ready documentation when paired with manual logbooks compliant with 21 CFR Part 11 principles (e.g., handwritten entries with date/time/operator signature). It meets CE-marked electrical safety standards (IEC 61010-1) and conforms to electromagnetic compatibility directives (EN 61326-1).
Software & Data Management
The NDJ-8S operates as a standalone unit without proprietary software dependency. All measurement parameters—including spindle ID, speed, viscosity value, and full-scale ratio—are displayed and retained in volatile memory during active use. For traceable recordkeeping, users may manually transcribe readings into LIMS-compatible spreadsheets or integrate with third-party data acquisition systems via RS-232 interface (optional adapter available). Firmware does not support electronic signatures or automated report generation; however, its deterministic output format facilitates alignment with internal SOPs requiring raw-value capture, operator verification, and periodic recalibration logging per ISO/IEC 17025 Clause 6.5.
Applications
- Quality control of lubricating oils and transformer fluids per ASTM D445
- Formulation development of water-based paints and architectural coatings (ISO 2555)
- Viscosity grading of edible oils, syrups, and dairy products in food safety labs
- Stability assessment of topical pharmaceutical gels and ointments (USP <911>)
- Batch-to-batch consistency testing of adhesives, sealants, and inkjet inks
- Educational demonstrations of shear-thinning behavior in polymer solutions
- Pre-screening of slurry rheology prior to full-scale rheometer characterization
FAQ
What spindle configurations are included with the NDJ-8S?
The instrument ships with four standard spindles (#1–#4) and supports optional #0 spindle purchase for ultra-low-viscosity applications.
Is temperature control integrated into the NDJ-8S?
No—temperature regulation requires external water baths or Peltier accessories; the instrument assumes isothermal sample conditions during measurement.
Can the NDJ-8S measure yield stress?
It does not provide direct yield stress output, but stepwise speed reduction tests (e.g., descending ramp from 60 → 0.3 rpm) allow empirical identification of flow onset points.
How often should calibration be performed?
Annual verification against NIST-traceable silicone oil standards is recommended; more frequent checks are advised after mechanical shock or extended high-load operation.
Does the NDJ-8S comply with FDA or EU pharmacopeial requirements?
It satisfies instrumental prerequisites in USP <911> and Ph. Eur. 2.2.29 for viscosity determination, though final method validation remains user-responsible.
