HUAXI INSTRUMENT XD50 Oscillating U-Tube Digital Densitometer
| Brand | HUAXI INSTRUMENT |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Origin Category | Domestic (China) |
| Model | XD50 |
| Instrument Type | Oscillating U-Tube Densimeter |
| Form Factor | Benchtop Laboratory Instrument |
| Sample Type | Liquid |
| Density Range | 0–3 g/cm³ |
| Density Accuracy | ±0.0003 g/cm³ |
| Repeatability | ±0.0002 g/cm³ |
| Resolution | 0.0001 g/cm³ |
| Minimum Sample Volume | 1 mL |
| Temperature Control Range | 5–65 °C |
| Display | 7-inch Full-Color Touchscreen |
Overview
The HUAXI INSTRUMENT XD50 Oscillating U-Tube Digital Densitometer is a precision benchtop instrument engineered for high-accuracy, rapid determination of liquid density based on the fundamental physical principle of oscillating U-tube metrology. When a precisely machined hollow glass U-tube is filled with sample and set into resonant oscillation, its natural frequency shifts inversely with the square root of the sample’s mass density—governed by the well-established relationship f ∝ 1/√ρ. This method delivers inherently high reproducibility, minimal operator dependency, and immunity to surface tension or viscosity effects that compromise hydrostatic or buoyancy-based techniques. Designed for routine QC/QA laboratories, R&D environments, and contract testing facilities, the XD50 supports traceable density measurements across a broad range (0–3 g/cm³), accommodating aqueous solutions, organic solvents, oils, acids, bases, and low-viscosity polymer blends—provided they are free of suspended solids and entrapped air.
Key Features
- Oscillating U-tube measurement principle compliant with ISO 12084, ASTM D4052, and DIN 51757 standards for liquid density determination
- Integrated Peltier-based temperature control system maintaining ±0.02 °C stability over 5–65 °C operating range
- 7-inch full-color capacitive touchscreen interface with multilingual GUI (English default), contextual on-screen guidance, and step-by-step workflow prompts
- Automated sequence execution: auto-sampling (via integrated syringe pump or manual injection port), density measurement, solvent rinse, and drying cycle—all initiated with single-touch operation
- Real-time HD video monitoring window enabling visual verification of sample filling, bubble detection, and meniscus stability during oscillation
- Internal reference calibration using certified water and air standards; optional external validation with NIST-traceable density standards
- Robust borosilicate glass U-tube cell with corrosion-resistant wetted surfaces suitable for aggressive media including HNO₃, H₂SO₄ (dilute), and acetone
Sample Compatibility & Compliance
The XD50 is validated for homogeneous, low-to-moderate viscosity liquids (<500 mPa·s) without particulates, emulsions, or volatile components prone to evaporation during measurement. Samples must be degassed prior to loading to avoid resonance damping and frequency drift. The instrument complies with GLP documentation requirements through embedded audit trail functionality (user login, timestamped actions, parameter changes). Data export formats include CSV, PDF, and XML, supporting integration into LIMS environments. All firmware and calibration records adhere to FDA 21 CFR Part 11 readiness—enabling electronic signatures, role-based access control, and immutable data archiving when deployed in regulated pharmaceutical or chemical manufacturing settings.
Software & Data Management
The embedded XD50 Control Suite provides real-time density calculation, automatic temperature compensation (based on user-defined or built-in polynomial models), and unit conversion (g/cm³ → kg/m³, °API, °Bé, % w/w, molality, etc.) via customizable formula libraries. Measurement data are stored locally with metadata (operator ID, sample ID, date/time, temperature, raw frequency, standard deviation). USB and Ethernet interfaces support direct transfer to network drives or enterprise servers. Optional software modules enable SPC charting (X-bar/R), trend analysis across batches, and automated report generation aligned with ISO/IEC 17025 reporting templates.
Applications
- Concentration monitoring of ethanol-water mixtures in beverage and biofuel QA
- Density-based assay of sulfuric acid strength in electroplating bath management
- Quality release testing of pharmaceutical excipients (e.g., propylene glycol, glycerin) per USP
monographs - Batch consistency verification of lithium battery electrolytes and coolant formulations
- Raw material verification of industrial solvents (toluene, THF, DMF) against supplier certificates
- Research-grade density data acquisition for thermophysical property modeling (excess molar volume, partial molar volumes)
FAQ
What sample preparation is required prior to measurement?
Samples must be filtered (≤0.45 µm), degassed under vacuum or ultrasonication, and equilibrated to target measurement temperature within ±0.1 °C.
Can the XD50 measure slurries or suspensions?
No—solid particles interfere with U-tube resonance and cause irreversible clogging; only optically clear, particle-free liquids are supported.
Is third-party calibration certification available?
Yes—factory calibration includes traceable certificate per ISO/IEC 17025; on-site recalibration services with accredited documentation are offered globally.
How is compliance with 21 CFR Part 11 enforced?
Through configurable user roles, electronic signature capture, encrypted audit logs, and write-protected data storage—fully configurable to meet site-specific validation protocols.
What maintenance intervals are recommended?
U-tube cleaning after every 50 measurements with compatible solvents; annual verification of temperature sensor accuracy and oscillator frequency stability.
