Esco Lexicon II UUS-363-A-1-SS Ultra Low Temperature Vertical Freezer

Overview

The Esco Lexicon II UUS-363-A-1-SS is a vertically configured ultra-low temperature (ULT) freezer engineered for long-term, high-integrity storage of biologics, primary cell lines, genomic material, and other thermolabile biospecimens at –86 °C. Designed and manufactured in Singapore by Esco Lifesciences—a global leader in life science containment and cold chain infrastructure—the unit employs a dual-stage cascade refrigeration system with environmentally optimized HFC-free refrigerants (R290/R170 blend), delivering stable thermal performance under variable ambient conditions (10–32 °C). Its architecture integrates structural redundancy, including independent compressor circuits, redundant fan control logic, and real-time thermal mapping capability across the chamber volume. The freezer meets stringent international design and safety benchmarks, having undergone third-party validation per ANSI/ASHRAE 72-2005 (performance testing) and ARI 1200-2006/2008 (energy efficiency and recovery metrics), and certified by UL through DNS USA—ensuring compliance with North American electrical safety and EMC requirements.

Key Features

• Triple-layer vacuum-insulated door with magnetic gasket seal and integrated anti-condensation heater to minimize frost accumulation and ensure consistent door closure integrity.
• Patented Pressure Equalization Port (PEP) with spring-loaded, self-cleaning heated aperture—mounted on the front door—to enable rapid pressure equalization during frequent access without ice clogging.
• Aalto Silver controller featuring a high-brightness LED interface with intuitive navigation, real-time multi-point temperature monitoring (chamber, evaporator, condenser), and configurable alarm thresholds for power failure, door ajar, battery low, condenser overheat, and ambient temperature deviation.
• Integrated 12 V DC backup battery system providing ≥72 h of continuous alarm and display functionality during mains outage, with automatic recharge upon power restoration.
• RS-485 serial interface compatible with Esco Voyager software for remote monitoring, event logging, firmware updates, and programmable setpoint scheduling—supporting audit-ready data export in CSV or PDF formats.
• Modular internal architecture: standard three-door configuration (optional five-door variant available); stainless steel inner chamber (AISI 304); tool-free sliding hinge mechanism for all interior doors; removable outer door assembly for constrained-access installations.
• Optimized rack system increases per-shelf storage capacity by 75% versus prior-generation designs, accommodating standard 2 in × 2 in cryoboxes and ISO-compliant tube racks without vertical compression.

Sample Compatibility & Compliance

The Lexicon II UUS-363-A-1-SS maintains uniform temperature distribution (±2.5 °C max deviation across defined test points per ICH Q5C stability guidelines) and rapid recovery performance (<120 min to return to –86 °C after 60-second door opening at 25 °C ambient). It supports storage of vials, cryotubes, microplates, and cryoboxes compliant with ANSI/SLAS standards. All models are validated for GLP/GMP environments and support 21 CFR Part 11-compliant electronic records when used with Voyager software’s role-based user authentication, electronic signatures, and immutable audit trails. Optional sampling ports (up to two additional 12 mm diameter ports) allow for integration with external monitoring systems or inert gas purging setups without compromising thermal integrity.

Software & Data Management

Esco Voyager software provides centralized management of multiple Lexicon II units across distributed lab sites. It logs temperature, alarm events, door status, compressor runtime, and ambient sensor data at user-defined intervals (1–60 min resolution). Data retention exceeds 12 months locally and indefinitely on networked servers. The software generates automated reports aligned with ISO 17025 clause 7.8.2 (record control) and supports FDA audit readiness via timestamped, tamper-evident log files. Firmware updates are delivered over secure HTTPS with SHA-256 signature verification. USB data export (via Aalto Gold controller variant) enables offline analysis in MATLAB, Python, or LIMS platforms.

Applications

• Long-term archival storage of human and animal tissue specimens, PBMCs, stem cells, and induced pluripotent stem cells (iPSCs).
• Cryopreservation of viral vectors (AAV, lentivirus), mRNA-LNPs, and other advanced therapy medicinal products (ATMPs).
• Biobanking operations requiring ISO 20387:2018 conformance and traceability from receipt to retrieval.
• QC/QA laboratories maintaining reference standards for pharmacopeial testing (USP , EP 2.6.27).
• Academic and contract research organizations conducting longitudinal studies where sample integrity over decades is critical.

FAQ

What is the minimum ambient temperature required for stable operation?
The unit is rated for continuous operation between 10 °C and 32 °C ambient, with full specification compliance verified at 25 °C ±2 °C per ANSI/ASHRAE 72-2005.
Does the freezer support remote alarm notification via email or SMS?
Yes—when connected to a local network and configured with Voyager software, customizable email/SMS alerts can be triggered via SMTP or API-integrated messaging gateways.
Is the stainless steel interior electropolished for enhanced cleanability?
The AISI 304 stainless steel chamber features a #4 brushed finish; electropolishing is available as a factory-installed option (UUS-363-A-1-SS-EP) for ISO Class 5 cleanroom-compatible applications.
Can the unit be integrated into a building management system (BMS)?
Yes—via Modbus RTU over RS-485, enabling real-time temperature, status, and alarm signals to be relayed to third-party BMS platforms using standard register mapping documentation provided by Esco.
What is the expected service life of the cascade refrigeration system?
Based on HALT-tested compressor modules and field reliability data, the design life exceeds 15 years with scheduled maintenance (condenser cleaning, refrigerant leak checks, and gasket inspection every 6 months).