SHYP PZ-D-5 Digital Liquid Density & Specific Gravity Balance (Westphal Balance)
| Brand | SHYP |
|---|---|
| Origin | Shanghai, China |
| Model | PZ-D-5 |
| Maximum Capacity | 20–100 g |
| Readability | 0.001 g |
| Repeatability | ±0.001 g |
| Density Range | 0.000–2.000 g/cm³ (referenced to pure water at 20 °C) |
| Displacement Volume of Sinker | 5 cm³ |
| Calibration | Manual |
| Construction | Stainless steel critical components, agate knife-edge bearing |
| Dimensions (L×W×H) | 215 × 90 × 262 mm |
| Net Weight | 1.5 kg |
| Packaging Dimensions | 255 × 186 × 133 mm |
Overview
The SHYP PZ-D-5 Digital Liquid Density & Specific Gravity Balance is a precision mechanical-electronic hybrid instrument engineered for direct determination of liquid density and specific gravity via the Westphal principle — a classical hydrostatic weighing method based on Archimedes’ law. Unlike conventional analytical balances, the PZ-D-5 integrates a calibrated sinker (displacement volume: 5 cm³) and a high-resolution digital readout system to deliver traceable, temperature-referenced measurements in g/cm³ or dimensionless specific gravity units. Its design conforms to the fundamental metrological framework defined in ISO 2737:2021 (Liquid density determination — Hydrometer and pycnometer methods) and supports routine verification against ASTM D1475 (Standard Test Method for Density of Liquid Coatings, Inks, and Related Products). The balance operates with a reference standard of pure water at 20 °C (ρ = 0.998203 g/cm³, assigned as SG = 1.000), enabling direct comparison without computational conversion. The agate knife-edge suspension system ensures long-term mechanical stability and high angular sensitivity, while stainless steel load-bearing components resist corrosion from organic solvents, aqueous electrolytes, and mild acids commonly encountered in QC laboratories.
Key Features
- Agate knife-edge fulcrum system for enhanced mechanical sensitivity and minimal hysteresis
- Dual-mode output: simultaneous display of density (g/cm³) and specific gravity (SG) referenced to water at 20 °C
- Integrated 5 cm³ precision sinker manufactured to ISO 7870-2 geometric tolerance standards
- Stainless steel frame and load-receiving elements for dimensional stability and chemical resistance
- Manual calibration procedure compliant with ISO/IEC 17025:2017 Clause 6.5.2 (Equipment calibration requirements)
- Compact footprint (215 × 90 × 262 mm) and lightweight construction (1.5 kg net) suitable for benchtop deployment in R&D labs, production QA cells, and field service environments
- Resolution of 0.001 g with repeatability ≤ ±0.001 g under controlled ambient conditions (20–25 °C, <60% RH)
Sample Compatibility & Compliance
The PZ-D-5 accommodates transparent, low-viscosity liquids (e.g., ethanol, acetone, glycerol-water mixtures, mineral oils, dye solutions) with kinematic viscosity below 50 mm²/s at 20 °C. It is not recommended for volatile, highly corrosive (e.g., concentrated HNO₃, HF), or suspended-particle-laden samples without prior filtration. The instrument meets basic CE marking requirements for non-automatic weighing instruments under Directive 2014/31/EU (Measuring Instruments Directive – MID Annex MI-001). While not certified for GLP/GMP-regulated environments out-of-the-box, its manual calibration log, stable zero tracking, and documented repeatability support integration into validated workflows when paired with documented SOPs and periodic external verification per USP and Ph. Eur. 2.2.17.
Software & Data Management
The PZ-D-5 operates as a standalone hardware device with no embedded firmware or USB/RS-232 connectivity. All measurement data are recorded manually or transcribed into LIMS or Excel-based QA templates. Users may implement traceable data capture by pairing the balance with a calibrated thermometer (for temperature correction beyond 20 °C) and referencing NIST SRM 1816 (water density standard) during initial setup. Though lacking FDA 21 CFR Part 11-compliant audit trails, its deterministic mechanical-electronic architecture ensures inherent data integrity: each reading reflects a physical equilibrium state independent of software interpretation.
Applications
- Quality control of industrial solvents and cleaning agents in electronics manufacturing
- Density verification of polymer resin solutions prior to casting or fiber spinning
- Specific gravity assessment of battery electrolytes (e.g., sulfuric acid dilutions) in automotive and energy storage QA
- Beverage formulation consistency checks in food & beverage R&D (e.g., sugar concentration estimation via density correlation)
- Raw material screening for glass frits, ceramic slurries, and ink formulations in printing and coating industries
- Educational laboratory instruction in fluid mechanics, physical chemistry, and metrology fundamentals
FAQ
What is the temperature reference standard for specific gravity measurements?
All specific gravity values are referenced to pure water at 20 °C, consistent with ISO 31-3 and IUPAC recommendations.
Can the PZ-D-5 measure densities above 2.000 g/cm³?
No — the calibrated sinker and internal scaling are limited to the 0.000–2.000 g/cm³ range; higher-density liquids require alternative methods such as oscillating U-tube densitometry.
Is the 5 cm³ sinker removable for cleaning or replacement?
Yes — the sinker is mechanically detachable using the supplied tool; users must re-verify zero and full-scale balance after reinstallation.
Does the instrument require periodic recalibration with certified weights?
Manual calibration uses internal adjustment screws and does not require external weights; however, annual verification against traceable mass standards (e.g., Class M2) is recommended per ISO/IEC 17025.
How does ambient temperature affect measurement accuracy?
Density is temperature-dependent; deviations >±1 °C from 20 °C introduce systematic error — use a calibrated thermometer and apply literature-based correction factors (e.g., CRC Handbook density tables) for critical applications.
