UXS PDS Automated Media Dispenser

Overview

The UXS PDS Automated Media Dispenser is an engineered solution for high-precision, repeatable liquid handling in microbiological and cell culture workflows. Designed specifically for the dispensing of molten agar, nutrient broths, selective media, and other temperature-sensitive biological solutions into Petri dishes, it operates on a gravimetric or volumetric dispensing principle—calibrated in real time via integrated flow sensors and closed-loop feedback control. Unlike manual or semi-automated systems, the PDS eliminates operator-induced variability in volume delivery, thermal degradation during transfer, and cross-contamination risks associated with open-pour techniques. Its architecture supports seamless integration into biopharmaceutical quality control laboratories where adherence to ISO 13485, USP /, and GLP-compliant documentation practices is mandatory.

Key Features

• Gravimetric/volumetric dual-mode dispensing with ±0.5% repeatability (typical) across 10–50 mL range per dish
• Real-time flow calibration function ensures consistent delivery accuracy over extended operational cycles
• 7-inch capacitive color touchscreen interface with intuitive icon-driven navigation and multi-language support (English, Spanish, German, Chinese)
• Integrated temperature monitoring at dispensing nozzle (range: 35–65°C) to prevent premature solidification or thermal shock to heat-labile components
• Modular design allows direct coupling with UXS-compatible agar melting and holding systems—enabling end-to-end automated preparation without manual intervention or intermediate vessel transfer
• IP54-rated enclosure with stainless-steel fluid path components compliant with USP Class VI materials requirements
• Programmable dispensing profiles (up to 99 protocols), including pause/resume, batch numbering, and user-level access control (3-tier authentication)

Sample Compatibility & Compliance

The PDS accommodates standard Petri dishes up to 90 mm in diameter—including polystyrene, polypropylene, and gamma-sterilized disposable variants. It supports viscous media formulations (e.g., 1.5–2.0% w/v agarose, enriched Mueller-Hinton agar, chromogenic selective agars) without clogging or flow instability. All wetted surfaces are autoclavable or compatible with validated chemical sterilants (e.g., 70% ethanol, hydrogen peroxide vapor). The system conforms to IEC 61000-6-2 (immunity) and IEC 61000-6-3 (emissions) for laboratory electromagnetic environments. Firmware includes audit trail logging aligned with FDA 21 CFR Part 11 requirements, supporting electronic signatures and data integrity validation per ALCOA+ principles.

Software & Data Management

Control software runs on embedded Linux OS with deterministic real-time task scheduling. Each dispensing event records timestamp, operator ID, protocol version, target volume, actual dispensed mass/volume, nozzle temperature, and ambient humidity. Data exports in CSV and PDF formats; optional integration with LIMS via HL7 or RESTful API enables traceability from media preparation to colony enumeration. Version-controlled firmware updates are delivered via secure USB or network-based OTA (Over-The-Air) mechanism with SHA-256 signature verification. All logs are write-once/read-many (WORM) enabled by default to satisfy GMP documentation retention policies.

Applications

• Routine QC plating for environmental monitoring in cleanrooms (ISO 14644-1 Class 5–8)
• Antimicrobial susceptibility testing (AST) using CLSI M07/M100-compliant agar dilution plates
• Media fill simulations for aseptic process validation (Annex 1, EU GMP)
• High-throughput strain isolation and preservation workflows in biobanking facilities
• Preparation of diagnostic culture plates for clinical microbiology labs operating under CAP/CLIA standards
• Supporting DOE (Design of Experiments) studies requiring precise media composition replication across replicates

FAQ

What is the maximum allowable viscosity for stable dispensing?
The PDS maintains consistent performance up to 150 mPa·s at 45°C (e.g., 2.0% molten agar); higher viscosities require pre-heating stabilization and reduced dispensing speed.
Can the system be validated for GMP use?
Yes—full IQ/OQ documentation packages are available, including sensor calibration certificates traceable to NIST standards and protocol-specific performance qualification templates.
Is remote monitoring supported?
Standard Ethernet connectivity enables SNMP-based status polling and SMTP alerting for maintenance events (e.g., low reservoir, calibration due, door open).
Does it support non-round dishes or custom molds?
Only round Petri dishes ≤90 mm are supported; rectangular or specialty molds require mechanical adapter kits (available as optional accessories).
How often does flow calibration need to be performed?
Initial calibration is factory-performed; field recalibration is recommended every 3 months or after 500 dispensing cycles—whichever occurs first—using certified reference weights or volumetric flasks.