Countleader FL 2000 High-Throughput Automated Cell Counter

Overview

The Countleader FL 2000 is a fully automated, high-throughput cell counter engineered for precision, reproducibility, and regulatory compliance in biopharmaceutical R&D and manufacturing environments. It employs digital image-based cytometry with dual-fluorescence detection (acridine orange / propidium iodide, AO/PI) and brightfield (trypan blue) modalities—leveraging advanced optics, auto-focusing imaging, and machine vision algorithms to quantify viable and non-viable cells across up to 24 samples simultaneously. Unlike flow-based systems, the FL 2000 utilizes a closed, single-use microfluidic cartridge (FL24-plate) to eliminate carryover, cross-contamination, and fluidic maintenance. Its core measurement principle integrates statistical sampling over a large field-of-view (4.7 × 3.1 mm², ~12× larger than a standard hemocytometer), combined with nuclear DNA-specific fluorescence staining, ensuring accurate enumeration of nucleated cells—including challenging populations such as PBMCs, CAR-T cells, iPSCs, and low-purity or morphologically heterogeneous suspensions—while excluding anucleate debris, platelets, red blood cells, and air bubbles.

Key Features

• High-throughput 24-sample analysis per run: Completed in ≤12 minutes (trypan blue mode) or ≤17 minutes (AO/PI mode)
• Patented FL24-plate microfluidic cartridges: Two configurations—FL24-plate-A (pre-loaded AO/PI dye, 40 µL sample per well) and FL24-plate-B (empty channel, 20 µL sample + 20 µL trypan blue per well)—enabling automated mixing, staining, and imaging without manual pipetting
• No internal fluidics: Zero tubing, valves, or pumps—eliminates cleaning, calibration drift, and downtime
• Single-use, barcode-tracked consumables: Each FL24-plate carries a unique QR code for automatic volume calibration, audit-ready traceability, and LIMS integration
• 1.5× optical magnification with autofocus: Ensures consistent focus across all 24 channels; total analyzed cell count per sample reaches tens of thousands
• Regulatory-grade architecture: Built-in 2 TB SSD storage (>25,000 assay records), USB 3.0 export (≥1 port + expansion), PDF/TIFF/Excel output, and full 21 CFR Part 11 compliance

Sample Compatibility & Compliance

The FL 2000 is validated for primary and suspension-adapted mammalian cells—including PBMCs, CAR-T, NK, dendritic, hybridoma, CHO, HEK293, and iPSC-derived populations—regardless of size heterogeneity or viability status. Its AO/PI staining specificity for double-stranded DNA ensures selective counting of nucleated cells only, rejecting erythrocytes, platelet aggregates, cellular debris, and microcarriers. The system meets ISO 13485 design control requirements and supports IQ/OQ/PQ qualification using NIST-traceable calibration beads and vendor-provided 3Q documentation packages. It is routinely deployed in GLP-compliant cell line development (CLD), process development (PD), and CGT manufacturing workflows where data integrity, operator independence, and audit readiness are mandatory.

Software & Data Management

The embedded Countleader Analysis Suite provides dual-mode (AO/PI and trypan blue) analysis with customizable gating, re-analysis capability, dilution factor compensation, and growth curve generation. All images, scatter plots, histograms, and metadata are timestamped, user-logged, and stored with immutable audit trails. Software features include: user role-based access control (administrator, analyst, viewer), electronic signatures, session lockout, and encrypted electronic records—all aligned with FDA 21 CFR Part 11 Annex 11 and EU GMP Annex 11 expectations. Data retrieval is supported via experiment name, channel ID, date/time stamp, or custom sample ID; exported reports include raw fluorescence images, dot plots, diameter distribution histograms, and viability heatmaps.

Applications

• High-frequency cell counting in bioprocess monitoring (e.g., fed-batch, perfusion, and seed train expansions)
• CGT manufacturing: CAR-T/NK cell expansion tracking, transduction efficiency assessment, and release testing
• Vaccine and monoclonal antibody development: Host cell line characterization, clone selection, and media optimization
• Stem cell research: iPSC differentiation stage monitoring via diameter distribution profiling and viability kinetics
• QC/QA labs requiring 21 CFR Part 11–compliant cell enumeration for batch record documentation

FAQ

Does the FL 2000 require daily cleaning or fluidic maintenance?

No—the instrument contains no internal fluid pathways. Each FL24-plate is a sealed, disposable microfluidic cartridge; post-run disposal eliminates cleaning, priming, or clog risk.
Can I re-analyze previously acquired data with updated parameters?

Yes. The software supports full retrospective re-analysis of any stored dataset using modified thresholds, gating strategies, or algorithm settings—without re-running samples.
Is the system compatible with LIMS or enterprise data management platforms?

Yes. Barcode-scanned FL24-plate IDs, structured metadata export (CSV/Excel), and time-stamped audit logs enable seamless integration with laboratory information management systems.
What validation support is provided for regulated environments?

Applitech supplies IQ/OQ/PQ protocols, performance qualification kits (including calibrated bead standards), and 3Q documentation packages compliant with USP , ASTM E2877, and ICH Q5D guidelines.
How does the FL 2000 handle clumped or irregularly shaped cells?

The AI-assisted image segmentation engine identifies and deconvolutes cell clusters based on fluorescence intensity gradients and morphological metrics—reporting both total count and aggregation ratio as a quantitative QC metric.