HMD-1 Portable Density Meter
| Brand | Beijing Hangfeng |
|---|---|
| Origin | Beijing, China |
| Model | HMD-1 |
| Measurement Principle | Oscillating U-tube (Digital Density Determination) |
| Sample Volume | 2 mL |
| Display | Color LCD with backlighted viewing window |
| Power | Rechargeable battery (≥6 h continuous operation) |
| Accuracy | ±0.001 g/cm³ |
| Temperature Control | Peltier-assisted (±0.02 °C stability) |
| Compliance | ISO 12084, ASTM D4052, USP <841> |
Overview
The HMD-1 Portable Density Meter is a compact, field-deployable instrument engineered for high-precision digital density and concentration measurements based on the oscillating U-tube principle. It operates by detecting the resonant frequency shift of a precisely machined glass U-tube filled with sample—where density is inversely proportional to the square of the oscillation period. This method delivers traceable, SI-unit–referenced results without reliance on calibration curves or reference standards for routine use. Designed for ruggedized field deployment, the HMD-1 meets the operational demands of quality assurance teams requiring immediate, lab-grade density data outside controlled laboratory environments—including brewery floors, fuel depots, beverage production lines, and chemical distribution terminals.
Key Features
- Oscillating U-tube sensor architecture: Ensures high reproducibility (RSD < 0.005%) and long-term stability with minimal drift; sensor tube is borosilicate glass with integrated temperature measurement (Pt100).
- Minimal sample requirement: Only 2 mL sample volume required—loaded via integrated manual syringe pump with air-bubble detection enabled by illuminated observation window and high-contrast color LCD.
- Onboard temperature control: Peltier element maintains sample temperature within ±0.02 °C during measurement, critical for compliance with ASTM D4052 and ISO 12084 protocols requiring thermal equilibrium.
- Field-optimized ergonomics: IP54-rated enclosure, shock-absorbing rubber overmold, and drop-tested housing (1.2 m concrete impact) ensure reliability in industrial outdoor settings.
- Extended battery autonomy: Lithium-ion pack supports ≥6 hours of continuous operation per charge, with real-time state-of-charge display and low-power sleep mode.
Sample Compatibility & Compliance
The HMD-1 accommodates liquids across a broad viscosity range (0.3–100 mPa·s) and chemical compatibility spectrum—including aqueous solutions, alcohols, hydrocarbons, syrups, and mildly corrosive formulations (pH 2–12). It is routinely deployed for ethanol content verification in beer and spirits (per AOAC 988.12), Brix/sugar concentration in soft drinks (aligned with ICUMSA GS4/4-10), and API gravity estimation in diesel and biodiesel blends. All density outputs are traceable to NIM (National Institute of Metrology, China) certified standards and fully compatible with GLP/GMP documentation workflows. Instrument firmware supports audit trail logging (user ID, timestamp, measurement value, temperature, and serial number) to satisfy FDA 21 CFR Part 11 requirements when paired with optional PC synchronization software.
Software & Data Management
Data export is supported via USB-C interface to Windows-based desktop software (included), enabling automated report generation in PDF/CSV formats compliant with internal QA templates. The embedded operating system stores up to 2,000 measurement records with metadata (date/time, operator ID, sample ID, ambient temperature, and instrument status flags). Optional Bluetooth 5.0 module enables wireless transmission to mobile QA apps for real-time SPC charting. Calibration history—including date, standard used (e.g., air/water dual-point), and technician signature—is retained and exportable for regulatory review.
Applications
- Real-time alcohol-by-volume (ABV) monitoring during fermentation and blending in craft breweries and distilleries.
- Routine density checks of finished beverages (carbonated soft drinks, fruit juices, dairy alternatives) to verify formulation consistency and detect adulteration.
- Fuel quality screening at retail stations and bulk terminals—verifying density thresholds for EN 590 (diesel), ASTM D975 (diesel fuel oil), and ASTM D3606 (gasoline).
- In-process density validation in pharmaceutical oral liquid manufacturing (syrups, suspensions) per USP and Ph. Eur. 2.2.39.
- Field-based verification of electrolyte concentration in lead-acid and lithium-ion battery recycling streams.
FAQ
What density range does the HMD-1 support?
The instrument measures densities from 0.6 g/cm³ to 2.2 g/cm³, optimized for common industrial liquids including hydrocarbons, aqueous solutions, and viscous food-grade fluids.
Is temperature compensation automatic?
Yes—integrated Pt100 sensor and Peltier thermal control provide real-time, closed-loop temperature regulation and automatic density correction to 20 °C or 25 °C per user selection.
Can the HMD-1 be calibrated in the field?
Yes—two-point calibration (air and water or certified reference fluid) is fully supported via intuitive menu navigation; calibration certificates and logs are stored onboard.
Does it meet international regulatory requirements for QC reporting?
Yes—audit trail functionality, electronic signatures, and exportable raw data files comply with FDA 21 CFR Part 11, EU Annex 11, and ISO/IEC 17025 documentation expectations.
How is cleaning and maintenance performed?
The U-tube cell is accessible via front-panel latch; cleaning is performed using solvent-compatible swabs and compressed air—no tools required. Full maintenance checklist and SOPs are provided in the English-language user manual.
