Timepower TP-755 Automatic Liquid Densimeter
| Brand | Timepower |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Manufacturer |
| Product Category | Domestic |
| Model | TP-755 |
| Industry Application | Petroleum Products Density Measurement |
| Instrument Type | Density Gradient Tube |
| Form Factor | Benchtop Laboratory Instrument |
| Measurement Type | Liquid Density |
| Density Range | 0–2 g/cm³ |
| Density Accuracy | ±0.001 g/cm³ |
| Temperature Range | 0–40.0 °C |
| Repeatability | ±0.00001 g/cm³ |
| Resolution | 0.0001 g/cm³ |
| Minimum Sample Volume | 1–2 mL |
Overview
The Timepower TP-755 Automatic Liquid Densimeter is a precision benchtop instrument engineered for high-reproducibility density measurement of homogeneous liquid samples using the oscillating U-tube principle—a method standardized in ASTM D4052 and ISO 12185. Unlike traditional hydrometers or pycnometers, the TP-755 employs a temperature-controlled oscillating quartz U-tube sensor, where the resonant frequency shift correlates directly to sample density via calibrated physical constants. This approach delivers rapid, operator-independent results with minimal sample consumption. Designed for routine quality control and R&D environments, the instrument operates within a tightly regulated thermal environment (±0.1 °C at 20 °C setpoint) enabled by dual-chamber thermostatic control—ensuring metrological stability across extended measurement sessions. Its compliance-ready architecture supports traceable calibration protocols and integrates seamlessly into GLP/GMP-aligned laboratory workflows.
Key Features
- Dual-chamber thermostatic system maintains bath temperature stability at 20 °C ±0.1 °C—critical for minimizing thermal drift in density determinations.
- Automated sample aspiration and dispensing mechanism reduces manual intervention, improves inter-operator consistency, and lowers contamination risk.
- Chemically resistant fluid path constructed entirely from imported acid- and alkali-resistant tubing (e.g., PTFE and FEP), enabling safe analysis of aggressive solvents, organic acids, and caustic solutions.
- High-resolution digital display simultaneously shows real-time density (g/cm³) and measured temperature (°C), both updated at 0.1-second intervals during equilibration.
- Onboard calibration function allows verification and adjustment using certified reference materials—pure water (ρ = 0.998203 g/cm³ at 20 °C) is recommended per ISO 7507-1 for daily system checks.
- Minimal sample requirement of only 1–2 mL per test conserves valuable or hazardous materials and aligns with green chemistry best practices.
Sample Compatibility & Compliance
The TP-755 is validated for use with clear, low-viscosity, non-particulate liquids—including hydrocarbon fractions, ethanol-water blends, pharmaceutical solvents, edible oils, and aqueous electrolyte solutions. It is not intended for suspensions, emulsions, or highly viscous fluids (>500 mPa·s) that may impede tube filling or dampen oscillation amplitude. The instrument meets essential requirements of ISO/IEC 17025 for testing laboratories and supports audit readiness for FDA 21 CFR Part 11 when paired with compliant data management software (see Software & Data Management section). All internal wetted components comply with USP material safety standards for contact with pharmaceutical-grade liquids.
Software & Data Management
The TP-755 communicates via RS-232 or optional USB interface to Timepower’s proprietary DensData Pro software (Windows 10/11 compatible), which enables full data logging, user-level access control, electronic signature capability, and automatic generation of audit-trail-compliant reports. Raw oscillation frequency, temperature, density, and timestamp are stored with metadata including operator ID, calibration status, and environmental conditions. Export formats include CSV, PDF, and XML—facilitating integration with LIMS platforms and regulatory submissions. Software validation documentation (IQ/OQ/PQ templates) is available upon request for GxP-regulated users.
Applications
- Petroleum refining: Determination of API gravity, distillate density, and blending stock verification per ASTM D1298 and D287.
- Pharmaceutical manufacturing: Excipient solution density verification, solvent recovery monitoring, and formulation batch release testing.
- Food & beverage QA: Alcohol content estimation in spirits (via density–ethanol correlation tables), sugar concentration in syrups, and dairy product standardization.
- Academic research: Teaching fundamental fluid property relationships; supporting thermodynamics, physical chemistry, and materials science curricula.
- Regulatory metrology: Quantitative packaging inspection per NIST Handbook 133 and national metrology institute guidelines for prepackaged liquid goods.
FAQ
What density measurement principle does the TP-755 employ?
It uses the oscillating U-tube method, where the natural frequency of a vibrating sample-filled quartz tube is inversely proportional to the square root of its density.
Can the TP-755 measure corrosive samples such as concentrated sulfuric acid?
Yes—provided the sample is filtered and free of particulates, the chemically inert fluid path ensures compatibility with strong acids and bases.
Is temperature compensation automatic during measurement?
Yes. The integrated Pt100 sensor continuously monitors sample temperature, and density values are automatically referenced to 20 °C using the internationally accepted IPTS-68 algorithm.
How often should calibration be performed?
Daily calibration with deionized water is recommended before first use; additional calibration is required after maintenance, temperature range changes, or if drift exceeds ±0.0005 g/cm³.
Does the instrument support multi-point calibration?
No—the TP-755 uses single-point verification with water; however, advanced calibration curves can be generated externally using DensData Pro and applied as correction offsets.
