COMECAUSE IN-YJ500 Automated Colony Counter and Zone-of-Inhibition Analyzer

Overview

The COMECAUSE IN-YJ500 Automated Colony Counter and Zone-of-Inhibition Analyzer is a high-precision digital imaging system engineered for quantitative microbiological analysis in regulated laboratory environments. It operates on the principle of computational image acquisition and pixel-based morphometric segmentation, leveraging calibrated visible and UV illumination to capture high-fidelity monochrome or color digital images of microbial growth on solid media. The instrument performs two core analytical functions: (1) automated colony-forming unit (CFU) enumeration across diverse plating formats—including pour plates, spread plates, membrane filters, PetriFilm™, CompactDry™, and RIDA™—and (2) objective measurement of inhibition zone diameters for antibiotic susceptibility testing (AST), including compliance-driven efficacy calculation per pharmacopoeial standards (USP <61>, EP 2.6.12, ChP 2025). Its optical architecture integrates a 25 MP color CMOS sensor with a 12 mm f/1.4 lens, enabling sub-0.05 mm resolution detection under controlled illumination conditions. All analyses are traceable, repeatable, and fully auditable—designed to meet GLP, GMP, and ISO/IEC 17025 requirements for data integrity.

Key Features

• Sealed dark chamber with zero ambient light intrusion, ensuring consistent image acquisition across environmental conditions
• Dual independently controllable lighting system: top-mounted 360° quad-color LED (white, red, green, blue) and bottom-transmitted white LED—both software-adjustable in 1% increments
• Integrated UV modules: 254 nm germicidal lamp for chamber decontamination and 366 nm excitation lamp for fluorescent colony visualization (e.g., E. coli expressing GFP, chromogenic agar assays)
• Automated multi-mode colony detection: 10 preconfigured algorithms optimized for dispersed, clustered, micro-colonies (0.1–0.5 mm), large colonies (>2 mm), colored substrates, and high-contrast membranes
• Zone-of-inhibition analysis with three complementary edge-detection methods: auto-contour detection, circular fitting (for non-ideal zones), and manual 3-point circle definition
• Pharmacopoeia-compliant potency calculation: one-dose method (USP), two-dose and three-dose methods (ChP 2025), with built-in standard curve interpolation and statistical validation
• Pixel-to-mm calibration via dual-path verification: automatic camera-parameter-based scaling and user-verifiable physical standard plate (for inhibition zones) or ruler-based reference (for colony sizing)

Sample Compatibility & Compliance

The IN-YJ500 supports standard Petri dishes (90–110 mm diameter), as well as miniaturized plates (centered placement), filter membranes, commercial rapid test films (3M PetriFilm™, BioControl CompactDry™, R-Biopharm RIDA™), and chromogenic or fluorogenic agars. Its illumination flexibility enables reliable detection across opaque, translucent, pigmented, or fluorescent media. The system conforms to international regulatory expectations for analytical instrumentation: raw image files are immutable upon acquisition; all processing steps—including algorithm selection, threshold adjustments, and manual corrections—are logged with timestamp, operator ID, and parameter values. Audit trails comply with FDA 21 CFR Part 11 requirements for electronic records and signatures. Data export includes PDF reports with embedded metadata, hash-verified image archives, and CSV-compatible structured result tables suitable for LIMS integration.

Software & Data Management

The proprietary COMECAUSE MicroScan™ software provides a bilingual (English/Chinese) interface with role-based access control (administrator, analyst, reviewer). Each user operates within an isolated workspace; no cross-account data visibility is permitted without explicit delegation. Image storage follows a write-once-read-many (WORM) protocol: original TIFF/JPEG captures are preserved unaltered, while processed results exist as derivative datasets linked via immutable UUIDs. Software features include real-time contamination rejection using multi-parameter filtering (color saturation, circularity ≥0.65, area 0.002–25 mm²), single-colony morphometrics (diameter, perimeter, area, roundness), and population-level size distribution histograms (25-bin classification). Cloud synchronization is optional and TLS 1.3 encrypted; local deployment supports air-gapped operation. Calibration history, firmware revision logs, and maintenance records are retained indefinitely within the audit trail database.

Applications

The IN-YJ500 serves critical quality control and research functions across multiple sectors: pharmaceutical sterility testing and antimicrobial assay validation; food and beverage pathogen quantification (e.g., Salmonella, L. monocytogenes) per ISO 4833-1; cosmetic preservative efficacy testing (ISO 11930); environmental monitoring in cleanrooms (ISO 14644); clinical microbiology AST workflows; academic research in bacterial fitness, biofilm dispersion, or resistance evolution studies. Its capacity to process >1200 CFU per second enables throughput scaling for high-volume labs performing batch release testing or surveillance programs. Fluorescence capability extends utility to reporter-strain assays, viability staining (e.g., LIVE/DEAD® BacLight™), and engineered biosensor development.

FAQ

Does the IN-YJ500 support FDA 21 CFR Part 11 compliance?
Yes—the system implements electronic signature enforcement, audit trail logging with tamper-evident hashing, and role-based permissions aligned with Part 11 Subpart B requirements.
Can it measure inhibition zones on non-circular or irregularly shaped plates?
Yes—its “circular fitting” algorithm computes best-fit geometry for elliptical or asymmetric zones, and manual 3-point definition allows precise measurement even with fragmented edges.
Is cloud connectivity mandatory?
No—cloud sync is optional; full functionality is retained in offline mode with local database storage and encrypted USB export.
What validation documentation is provided?
Each unit ships with IQ/OQ documentation templates, a factory-calibrated standard plate certificate, and software verification reports covering linearity, repeatability (≤0.001 mm zone diameter RSD), and accuracy against NIST-traceable references.
How is user training delivered?
COMECAUSE provides remote instructor-led sessions covering SOP development, algorithm selection logic, audit trail review, and troubleshooting—plus access to an online knowledge base with video SOPs and regulatory guidance summaries.