EJ Series Density Balance
| Origin | Japan |
|---|---|
| Manufacturer Type | Distributor |
| Origin Category | Imported |
| Model | EJ Series |
| Pricing | Upon Request |
Overview
The EJ Series Density Balance is a precision metrological instrument engineered for rapid, non-destructive determination of density for both solid and liquid samples. Based on the principle of Archimedes’ buoyancy method—combined with high-resolution mass measurement and temperature-compensated fluid density referencing—the system delivers direct digital readout of density (g/cm³ or kg/m³) without manual calculation. Designed for laboratory, QC/QA, and R&D environments where traceability, repeatability, and regulatory compliance are critical, the EJ Series integrates dual-mode operation (solid immersion and liquid displacement), real-time thermal compensation, and full digital calibration architecture. Its robust mechanical design and dual power supply (AC adapter + rechargeable battery) support flexible deployment across benchtop, cleanroom, and field-mobile applications.
Key Features
- High-contrast 16 mm tall backlit LCD display—optimized for low-light conditions and extended visual ergonomics.
- Direct-density readout for solids: automatic calculation using immersed weight, air weight, and reference fluid density—eliminating manual conversion errors.
- Direct-density readout for liquids: supports user-defined standard reference block parameters (e.g., volume, nominal density) to calibrate and quantify unknown liquid densities.
- Full digital calibration: enables editable reference mass values for zero-point and span calibration—supporting traceable adjustment without physical weights.
- Real-time temperature input: users enter ambient or fluid temperature directly on the front panel to apply ISO 7507-2–aligned thermal correction algorithms, minimizing density deviation caused by thermal expansion of reference fluids (e.g., kerosene, ethanol, or water).
- Multi-fluid compatibility: validated for use with kerosene, isopropanol, ethanol, and other low-surface-tension, non-corrosive immersion media per ASTM D1475 and ISO 1183 standards.
- Density deviation analysis: configurable upper (HI), pass (GO), and lower (LO) limits with audible/visual alarm output for go/no-go inspection workflows.
- Auto-power-off function with adjustable timeout (1–60 min) to conserve battery life during idle periods.
Sample Compatibility & Compliance
The EJ Series accommodates solid specimens ranging from 0.01 g to 220 g (model-dependent), including porous ceramics, polymers, metals, and composite materials. For liquid density analysis, sample volumes as low as 15 mL are sufficient when used with the optional immersion basket and temperature-stabilized bath setup. All firmware and calibration routines adhere to GLP, GMP, and ISO/IEC 17025 requirements. The instrument supports generation of audit-ready calibration reports—including operator ID, timestamp, environmental conditions (T/°C), reference mass values, and deviation logs—fully compliant with FDA 21 CFR Part 11 when paired with validated data acquisition software.
Software & Data Management
Equipped with RS-232 (standard) and plug-and-play USB (optional) interfaces, the EJ Series enables seamless bidirectional communication with Windows-based systems. Raw measurement data—including density, temperature, mass, and status flags—is streamed in ASCII format compatible with Microsoft Excel, LabVIEW, MATLAB, and LIMS platforms. Optional PC software provides statistical process control (SPC) tools: mean, SD, Cp/Cpk, trend charts, and histogram generation. All exported files include embedded metadata (instrument ID, calibration date, operator code) to satisfy ISO 9001 documentation requirements and internal QA record retention policies.
Applications
- Quality control of injection-molded plastics and elastomers (ASTM D792, ISO 1183-1)
- Density grading of sintered metal powders and ceramic green bodies
- Verification of electrolyte concentration in battery manufacturing
- Porosity and water absorption rate analysis per ASTM C20 and ISO 10545-3
- Thermal expansion coefficient estimation via multi-temperature density profiling
- Raw material verification in pharmaceutical excipient production (USP & EP monographs)
FAQ
What reference fluids are recommended for routine calibration?
Kerosene (density ≈ 0.78–0.81 g/cm³ at 20°C) is the default medium specified in the operating manual; alternatives include anhydrous ethanol (0.789 g/cm³) and distilled water (0.9982 g/cm³), provided temperature is recorded and compensated.
Can the EJ Series perform density measurements below 0.5 g/cm³?
Yes—when used with low-density reference fluids and properly configured buoyancy fixtures, the system achieves reliable measurement down to 0.15 g/cm³ for foams and expanded polymers.
Is firmware upgrade supported in-field?
Firmware updates are delivered via USB stick and executed through the front-panel menu—no external programmer or service engineer required.
How is traceability maintained during calibration?
Each calibration event stores a unique digital signature, including certified reference mass ID, environmental T/RH, and operator credentials—exportable as PDF or CSV for internal audit trails.
Does the instrument support continuous streaming mode for automated test lines?
Yes—RS-232 command protocol includes “auto-trigger” mode, enabling synchronized measurement initiation from PLC or barcode scanner signals.
