KEM AS-8030 Automated Multi-Sample Autosampler for Oscillating U-Tube Densimeters

Overview

The KEM AS-8030 Automated Multi-Sample Autosampler is an engineered solution designed exclusively for integration with KEM’s high-precision oscillating U-tube digital densimeters—specifically the DA-860, DA-850, and DA-840 series. Leveraging the fundamental principle of oscillating U-tube density measurement—where the resonant frequency of a filled U-shaped glass tube correlates directly to the mass density of the sample—the AS-8030 extends analytical throughput without compromising metrological integrity. It automates the full sequence of sample aspiration, temperature equilibration, injection into the densimeter cell, post-measurement purging, multi-stage solvent cleaning, high-efficiency drying, and optional sample recovery. Its architecture supports traceable, unattended operation in regulated environments, making it suitable for QC laboratories operating under GLP, ISO/IEC 17025, or pharmaceutical GMP frameworks where audit-ready process documentation is required.

Key Features

• Four configurable flow units (FU1–FU4) enabling application-specific optimization: pressure-driven sampling (FU1/FU2) minimizes bubble formation in volatile or viscous liquids; vacuum-driven sampling (FU3/FU4) accommodates low-viscosity aqueous systems.
• High-capacity drying pump (FU2/FU3) reduces residual solvent dwell time by up to 40%, critical for high-throughput labs processing >100 samples per day.
• Triple-solvent cleaning capability (FU2) allows concurrent use of water, ethanol, and hexane—or other miscible/non-miscible solvents—to remove diverse matrix residues including surfactants, polymers, and hydrocarbon oils.
• Dedicated co-wash unit (FU4) executes synchronized rinse-and-dry cycles using minimal solvent volume, reducing consumable cost and waste generation while maintaining cross-contamination control below 10 ppm.
• Pressurized sampling mode enables stable handling of highly volatile compounds (e.g., light hydrocarbons, refrigerants, low-boiling solvents) by suppressing vapor-phase nucleation during transfer.
• Sample recovery function (FU1/FU2) returns measured material to its original vial—essential for precious, toxic, or regulated substances where disposal is restricted or costly.
• Compact footprint (300 × 600 mm) integrates seamlessly into standard fume hoods or benchtop workflows; auto-power-down activates after 30 minutes of inactivity, complying with IEC 62304 energy management guidelines.

Sample Compatibility & Compliance

The AS-8030 handles liquids with viscosities up to 50,000 mPa·s (FU1/FU2) or 1,000 mPa·s (FU3/FU4), supporting aqueous, organic, ionic liquid, and emulsion-based matrices. It accepts standardized 20 mL borosilicate glass vials with PTFE-lined caps, compatible with KEM’s certified sealing kits (e.g., part #12-03601). All wetted components—including fluidic paths, valves, and syringe actuators—are chemically resistant to common laboratory solvents (e.g., acetone, chloroform, methanol, toluene) and corrosion-resistant to pH 1–13 solutions. The system meets electromagnetic compatibility (EMC) requirements per EN 61326-1 and safety standards per IEC 61010-1. When paired with DA-860/DA-850 densimeters, it supports full compliance with ASTM D4052 (Standard Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter) and ISO 12185 (Crude Petroleum and Petroleum Products — Determination of Density — Digital Density Meters).

Software & Data Management

Controlled via KEM’s proprietary Density Manager software (v3.2+), the AS-8030 supports method-driven sequencing, real-time status monitoring, and electronic logbook generation. Each run records timestamped metadata—including sample ID, temperature setpoint, oscillation period, calculated density, cleaning cycle duration, and error flags—for full traceability. Audit trails comply with FDA 21 CFR Part 11 requirements when deployed with validated user access controls, electronic signatures, and immutable data archiving. Export formats include CSV, PDF reports, and direct integration with LIMS via TCP/IP or RS-232C protocols. Optional USB storage enables offline backup of calibration logs and maintenance histories.

Applications

• Quality control of petrochemical feedstocks (gasoline, diesel, biodiesel blends) per ASTM D1298 and IP 160.
• Concentration verification of electrolyte solutions in battery R&D (LiPF₆ in EC/DMC, KOH in water).
• Alcohol content determination in spirits and pharmaceutical tinctures (USP ).
• Surfactant formulation screening in personal care product development.
• Density profiling of polymer solutions (e.g., PMMA in THF) for molecular weight estimation via Mark–Houwink relationships.
• Stability testing of nanoemulsions and colloidal dispersions under accelerated temperature cycling.

FAQ

Which KEM densimeters are compatible with the AS-8030?
The AS-8030 is certified for seamless hardware and software integration with the DA-860, DA-850, and DA-840 digital oscillating U-tube densimeters only.
Can the AS-8030 be used with non-KEM densimeters?
No. It relies on proprietary TTL-level trigger signals and bidirectional serial communication protocols exclusive to KEM’s DA-series instruments.
Is temperature equilibration performed by the autosampler or the densimeter?
Temperature stabilization occurs entirely within the densimeter’s Peltier-controlled measuring cell; the AS-8030 delivers samples at ambient or pre-chilled/warmed conditions but does not regulate sample temperature independently.
What maintenance intervals are recommended for the fluidic system?
KEM recommends quarterly inspection of seals (part #20-06076), biannual replacement of syringe barrels, and validation of cleaning efficiency using certified reference materials (e.g., KEM SRM-101) every 200 runs.
Does the AS-8030 support 21 CFR Part 11-compliant electronic signatures?
Yes—when operated with validated Densify Manager software v3.2+, configured user roles, and encrypted database logging enabled.