FOSS Fossomatic 7 Automated Somatic Cell Counter for Dairy Milk Analysis

Overview

The FOSS Fossomatic 7 is a fully automated, high-throughput somatic cell counter engineered specifically for dairy quality control laboratories operating under stringent regulatory and contractual requirements. It employs validated flow cytometry principles—where individual cells in a milk sample are hydrodynamically focused, stained with fluorescent nucleic acid dyes, and detected via laser-induced fluorescence—to deliver rapid, objective, and traceable somatic cell counts (SCC). Unlike manual microscopy or older impedance-based methods, the Fossomatic 7’s optical detection architecture ensures discrimination between intact nucleated somatic cells and non-cellular debris or lysed fragments, thereby improving biological relevance and analytical robustness. Its design aligns with internationally recognized reference methodologies, including ISO 13366-1 (Milk — Determination of somatic cell count — Part 1: Fluorometric method using flow cytometry) and IDF Standard 148, and meets the performance criteria stipulated in the U.S. FDA/NCIMS Pasteurized Milk Ordinance (PMO) Grade A laboratory accreditation program.

Key Features

• Modular fluidic architecture enabling rapid access to critical components—including flow cells, peristaltic pumps, and reagent manifolds—for routine cleaning and scheduled maintenance without specialized tools.
• Enhanced operational efficiency: improved work coefficient from 300 to 100 (i.e., reduced instrument downtime per sample batch), achieved through optimized valve sequencing and minimized rinse cycle duration.
• Flexible reagent handling: supports both pre-mixed reagent cartridges and user-configurable manual mixing—allowing labs to balance cost control with protocol standardization.
• Continuous operation capability: cleaning solution reservoirs can be refilled during active analysis without interrupting sample throughput or requiring system shutdown.
• Low-maintenance sample transport: open-loop sample track design eliminates compressed air dependency; all surfaces contacting milk or reagents are accessible for wipe-down or steam sterilization.
• Integrated hardware diagnostics: real-time monitoring of laser alignment stability, photomultiplier tube gain, and fluid pressure profiles ensures consistent measurement integrity across shifts and operators.

Sample Compatibility & Compliance

The Fossomatic 7 accepts raw, pasteurized, and standardized milk from bovine, ovine, caprine, and buffalo sources without modification to core assay parameters. Its calibration and verification protocols are traceable to NIST-traceable reference materials and certified reference laboratories participating in international proficiency testing schemes (e.g., ICAR, ERM). Regulatory compliance extends beyond method validation: the system supports audit-ready documentation required for GLP and GMP environments, including full electronic records retention, user-access logging, and change-control tracking per FDA 21 CFR Part 11 when deployed with Foss Integrator NOVA software in validated configurations.

Software & Data Management

Foss Integrator NOVA serves as the unified control, analysis, and reporting platform for the Fossomatic 7. It provides role-based user authentication, configurable data export formats (CSV, XML, LIS-compatible HL7 v2.x), and automated generation of QC reports aligned with ISO/IEC 17025 clause 7.7 requirements. The software maintains full audit trails—including timestamped operator actions, calibration events, and result modifications—with cryptographic hashing of critical data objects. Instrument-to-LIMS integration is supported via secure RESTful API endpoints or direct ODBC connectivity, enabling seamless incorporation into enterprise-wide quality management systems.

Applications

• Dairy farm gate testing and supplier qualification programs requiring rapid SCC screening prior to bulk tank loading.
• Regulatory surveillance laboratories performing official milk quality assessments under national food safety frameworks.
• Research institutions investigating mastitis biomarkers, immune response dynamics, or breed-specific SCC thresholds.
• Contract testing facilities delivering accredited SCC data for export certification (e.g., EU Regulation (EC) No 853/2004 Annex III).
• Process optimization studies correlating SCC trends with milking hygiene practices, udder health interventions, or herd management changes.

FAQ

What regulatory standards does the Fossomatic 7 comply with?

It conforms to ISO 13366-1, IDF 148, and FDA/NCIMS Grade A laboratory performance criteria for somatic cell enumeration.
Can the instrument differentiate between live and dead somatic cells?

No—the Fossomatic 7 quantifies total nucleated somatic cells using membrane-permeant DNA dyes; it does not incorporate viability staining protocols.
Is the Fossomatic 7 DC model capable of reporting lymphocyte/neutrophil ratios?

Yes—the DC variant applies multivariate scatter plot gating to distinguish morphologically distinct subpopulations based on forward/side scatter and fluorescence intensity profiles.
Does the system require daily calibration with reference standards?

Daily verification using certified control materials is recommended; full calibration is performed during initial installation and after major hardware service events.
How is data integrity ensured during long-term deployment?

Through hardware-enforced write-once storage of raw acquisition files, digital signature validation of report exports, and time-synchronized network logging compliant with IEC 62443-3-3 security levels.