Millet MLT-YDYTT Series Liquid-phase Liquid Nitrogen Cryogenic Storage Tanks (Round Canister Configuration)

Overview

The Millet MLT-YDYTT Series liquid-phase liquid nitrogen cryogenic storage tanks are engineered for long-term, static ultra-low-temperature preservation of sensitive biological specimens. Operating in the liquid phase—where samples are fully submerged in liquid nitrogen at −196 °C—the series ensures exceptional thermal stability and minimal temperature fluctuation during storage. This configuration is critical for maintaining viability of high-value biospecimens including mammalian embryos, hematopoietic stem cells, oocytes, spermatozoa, primary tissues, organ fragments, viral vectors, and temperature-labile vaccines. Unlike gas-phase tanks, the liquid-phase design delivers uniform cryogenic exposure across all sample positions within the canister, eliminating vertical thermal gradients and reducing the risk of transient warming events during routine access. The MLT-YDYTT series employs a narrow-neck geometry combined with multi-layer vacuum insulation to suppress boil-off, enabling extended hold times without refilling—supporting unattended operation over weekends and holidays in core biobanking and reproductive medicine laboratories.

Key Features

• High-strength, lightweight aluminum alloy tank construction—resistant to mechanical impact, corrosion, and thermal fatigue under repeated cryogenic cycling.
• Narrow-neck aperture (50 mm or 80–127 mm for larger models) minimizing convective heat ingress and reducing static evaporation rates to as low as 0.12 L/day in smaller units.
• Multi-layer super-insulated vacuum jacket with stable vacuum integrity, limiting radiative heat transfer and ensuring consistent long-term thermal performance.
• Modular round canister (circular lift bucket) system—standardized 38 mm diameter for compact formats; optional 63 mm and 97 mm variants accommodate larger tissue cassettes or custom vial racks.
• Hinged ergonomic lifting handles integrated into the outer shell—enabling safe, balanced manual transport without compromising structural rigidity.
• Optional security lid lock mechanism compliant with ISO 20387:2018 biobank access control requirements.
• Optional electronic liquid level sensor with audible/visual low-level alarm—supports GLP-compliant monitoring and integrates with facility-wide environmental logging systems.

Sample Compatibility & Compliance

The MLT-YDYTT series accommodates standard cryovial formats (e.g., 0.5–5.0 mL externally threaded tubes), cryoboxes (e.g., 10×10 grid configurations), and tissue storage cassettes. Each round canister supports up to 54 cryovials (6 per cryobank strip) in base configurations, scaling to 1,440 vials in the MLT-YDYTT47P model using high-density 40-strip canisters. All models meet ISO 13485:2016 design control principles for medical device-related storage equipment and conform to ICH M10 guidance on bioanalytical method validation for specimen integrity. Vacuum integrity testing follows ASTM E515–22 (Standard Test Method for Leak Detection of Vacuum Systems). Units intended for clinical IVF or biobanking applications may be validated per CLIA, CAP, or AABB standards upon customer request.

Software & Data Management

While the base MLT-YDYTT series operates as a passive storage system, optional digital modules support integration into laboratory information management systems (LIMS). The low-level alarm interface outputs analog voltage or dry-contact signals compatible with Siemens Desigo, Schneider EcoStruxure, or LabVantage platforms. Audit-trail-capable data loggers (sold separately) record time-stamped liquid nitrogen level, ambient temperature, and door-open events—satisfying FDA 21 CFR Part 11 requirements when deployed with electronic signature workflows. Firmware updates and calibration logs are stored locally with SHA-256 hash verification to ensure data integrity.

Applications

• Long-term archiving of human embryonic stem cell lines and induced pluripotent stem cells (iPSCs) in GMP-compliant cell therapy manufacturing suites.
• Cryopreservation of bovine and equine semen in veterinary AI centers requiring >10-year viability retention.
• Storage of clinical-grade dendritic cell vaccines and CAR-T intermediates prior to infusion.
• Biorepository operations supporting NIH-funded longitudinal cohort studies (e.g., All of Us Research Program).
• University core facilities managing shared frozen tissue banks for translational oncology research.
• Vaccine stabilization programs for mRNA-LNP formulations requiring uninterrupted −196 °C chain-of-custody.

FAQ

What is the difference between liquid-phase and vapor-phase liquid nitrogen storage?
Liquid-phase storage submerges samples directly in liquid nitrogen (−196 °C), delivering maximum thermal stability and uniformity. Vapor-phase storage suspends samples above the liquid (−150 °C to −190 °C), offering reduced contamination risk but greater thermal variability.
Can the MLT-YDYTT tanks be used for GMP-regulated cell banking?
Yes—when equipped with audit-trail-capable monitoring and validated per ISBER Best Practices and EU Annex 1, these tanks support Grade A/B cleanroom-adjacent storage of master and working cell banks.
Is vacuum re-pumping required during service life?
No—multi-layer vacuum jackets are sealed and non-repairable; however, vacuum decay is monitored via annual helium leak testing per ASTM E493, with typical service life exceeding 12 years.
Are custom canister configurations available?
Yes—Millet offers OEM engineering support for application-specific canister geometries, barcoded rack interfaces, and RFID-enabled tracking inserts.
Does the tank require external power for basic operation?
No—passive operation only. Optional alarms and sensors require 12–24 V DC power, supplied via included wall adapter or PoE injector.