3
The Safest Ultra-Low Freezers
for Long-Term Storage of Ultra-
Critical Biologicals
The SANYO Twin Guard Series
™
satisfies
the industry demand for safe, long-
term storage for the most high-valued
materials. Two independent refrigeration
systems, combined with optional liquid
nitrogen or liquid CO
2
back-up systems,
offer a circle of protection unmatched in
the marketplace. Developed for use with
conventional inventory racks and boxes,
the Twin Guard Series
™
is ideal for stor-
age of sensitive stem cells, embryos,
cell lines, and other rare specimens.
Twin Guard Series™ -86 Dual°Cool
Refrigeration System
The Twin Guard Series
™
Ultra-Low Freez-
er avoids conventional cascade refrigera-
tion technology by using two completely
independent one-compressor, autocas-
cade cooling systems, each capable of
maintaining ultra-low temperatures.
•
Each refrigeration circuit includes a
closed-loop cold-wall evaporator con-
figured in parallel to the other.
•
Independent evaporators and cooling
fans assure back up status at all times,
eliminating system failure due to
sub-component failure in conventional
cascade systems configured of mutu-
ally dependent high- and low-stage
systems.
Independent systems efficient ultra-low cooling is
achieved through two independent evaporator circuits
surrounding the interior chamber.
Ultra-Critical Installations and Applications Overview
Application
Justification
Benefit
Stem Cells, Cord Blood, T-Cells, Engineered Tissue,
Organ/Tissue, Vaccines, Bone Marrow, Hybridomas,
Lymphocytes, Cancer Cells, Clinical Specimens,
Fibroblasts, Ova, Sperm
Highly sensitive to temperature fluctuations or
uneven storage temperatures at different positions
within the interior chamber.
Enhanced temperature uniformity, top-to-bottom,
front-to-back, assures sample stability at all
inventory locations.
BSL-3/4 or Highly Secured Labs
Restricted access to the contained laboratory
limits serviceability.
Twin Guard Series
™
extends critical time necessary
to react in the event of mechanical failure.
•
In the unlikely event of a compressor
failure in one system, the remaining
system will automatically maintain a
minimum of -65°C for an indefinite
period.
•
In the event of a facility power failure
with optional CO
2
or LN
2
backup sys-
tem installed, the freezer will maintain
-65°C storage temperature for up to
eight hours (CO
2
backup system) and
-65°C storage temperature for up to
15 hours (LN
2
backup system).
•
A unique EcoMode
™
deploys both sys-
tems in overlapping cycles to maintain
-86°C and to reduce energy consump-
tion by as much as 15%.
•
Evaporator coils embedded in the pat-
ented, high-tech, SANYO V.I.P. PLUS
™
vacuum-insulated thin-wall cabinet are
strategically oriented to deliver the
best temperature uniformity at all shelf
levels, top-to-bottom and front-to-back.
•
New SANYO-designed Cool Safe
™
refrigeration compressors feature inno-
vative refrigerant feedback processes
to reduce compressor temperature,
thereby extending compressor life and
minimizing heat output.
The SANYO MDF-500VXC and MDF-U700VXC Twin Guard Series™ ultra-low freezers are designed for -86°C storage of high-value biologicals.
Ideal for critical material storage in repositories, highly secure BSL3/4 labs, hospitals, clinics and medical research facilities. The Twin Guard
Series
™
introduces the concept of dual, independent, auto cascade refrigeration systems contained within a single cabinet.
