Micromeritics Elzone 5390 Automated Particle Size and Count Analyzer

Overview

The Micromeritics Elzone 5390 Automated Particle Size and Count Analyzer is a precision-engineered instrument based on the Electrical Sensing Zone (ESZ) principle—commonly known as the Coulter principle. This method measures changes in electrical resistance across a micro-aperture as individual particles suspended in an electrolyte pass through it. Unlike optical techniques such as laser diffraction or dynamic light scattering, ESZ provides absolute, calibration-free particle sizing and counting independent of optical properties, density, color, or shape. Each pulse amplitude corresponds directly to particle volume, enabling high-fidelity volumetric size distribution and true particle concentration (particles/mL). The Elzone 5390 delivers trace-level sensitivity down to 0.4 µm and extends reliably to 1200 µm, supporting dual-range analysis via interchangeable orifices with up to 30:1 dynamic range per aperture. Its design eliminates mercury-based pressure systems and oil-lubricated aperture couplings—replacing them with digitally controlled metering pumps and dry, non-stick mechanical interfaces—thereby enhancing measurement robustness, reducing maintenance, and improving long-term stability in regulated environments.

Key Features

• Fully automated operation: power-on self-test, unattended analysis, automatic aperture cleaning, and clog detection with recovery protocol
• Integrated rinse system: eliminates manual pre- and post-run flushing; ensures consistent baseline stability and cross-sample carryover prevention
• Dry-coupling aperture interface: no hydrophobic grease required, minimizing particle entrapment and simplifying aperture decontamination
• Electromagnetic shielding enclosure: optional removal for low-noise lab environments while maintaining electrode signal integrity
• Backward compatibility: legacy Elzone orifices fully functional with Elzone II platform, preserving historical method continuity
• Compact footprint: optimized benchtop geometry conserving critical laboratory space without compromising thermal or mechanical stability
• Real-time curve overlay: enables direct comparison between test samples, reference standards, or sequential runs within the same session

Sample Compatibility & Compliance

The Elzone 5390 accommodates a broad spectrum of particulate systems—including metallic powders, polymer microspheres, biological cells, geological sediments, and pharmaceutical excipients—across aqueous, polar organic, and solvating organic electrolytes. Its insensitivity to refractive index or birefringence makes it uniquely suited for heterogeneous mixtures where composition varies widely. All measurements adhere to ASTM F2149–21 (Standard Test Method for Determining Particle Size Distribution of Colloidal Dispersions by Electrical Sensing Zone) and ISO 13322-1:2020 (Particle size analysis — Electrical sensing zone method — Part 1: Principles and basic considerations). The embedded software architecture meets FDA 21 CFR Part 11 requirements, including electronic signatures, audit trails, user role-based access control, and immutable data archiving—ensuring full traceability for GLP, GMP, and ISO/IEC 17025-compliant laboratories.

Software & Data Management

Elzone Control Software v4.x provides intuitive workflow navigation, real-time histogram visualization, and comprehensive statistical reporting—including D10, D50, D90, span, coefficient of variation, and cumulative frequency distributions. Advanced analysis modules support batch processing, outlier rejection using Chauvenet’s criterion, and multi-parameter correlation (e.g., size vs. count vs. concentration). Raw pulse data are stored in vendor-neutral HDF5 format, enabling third-party integration with LIMS platforms and Python/MATLAB-based custom analytics. Audit logs record every operator action, parameter change, and instrument event with timestamp, user ID, and IP address—fully satisfying regulatory documentation requirements for inspection readiness.

Applications

• Pharmaceutical development: quantification of subvisible particles in parenteral formulations per USP and
• Advanced materials R&D: characterization of battery cathode/anode slurries, catalyst supports, and nanocomposites
• Quality assurance: incoming raw material verification, batch release testing, and stability-indicating monitoring
• Environmental science: sediment grain-size profiling, microplastic enumeration in water matrices
• Biotechnology: viable cell counting, debris quantification in bioreactor harvest streams, and virus-like particle (VLP) sizing
• Food & beverage: starch granule distribution, fat globule analysis in emulsions, and additive dispersion uniformity assessment

FAQ

What particle size range can the Elzone 5390 measure?
The instrument covers 0.4 µm to 1200 µm, with each orifice providing a 20:1 to 30:1 dynamic range. Multiple orifices may be used sequentially to span the full range.
Does the system require mercury or oil-based components?
No. The Elzone 5390 replaces mercury manometers with precision metering pumps and eliminates lubricated aperture couplings—reducing hazardous waste and maintenance complexity.
Can legacy Elzone orifices be used with the Elzone 5390?
Yes. The platform maintains full mechanical and electrical compatibility with prior-generation orifices, ensuring method transfer integrity.
How does the system handle sample clogging during analysis?
An integrated pressure-monitoring algorithm detects flow anomalies in real time and triggers an automated backflush sequence without interrupting data acquisition.
Is the software validated for regulated environments?
Yes. Elzone Control Software is designed and documented to comply with FDA 21 CFR Part 11, including electronic signature validation, secure audit trail generation, and role-based permissions management.