vwr.com I Instruction manual VWR
®
ULT Freezer 352/528 Eco Premium 02/2022
Page 19/86
3. Chamber description
The VWR
®
ULT Freezers were produced with great care using the latest tools for development and pro-
duction. They were optimized for safe long-term storage of samples in the ultra-low temperature range. You
can operate the freezer in a temperature range from -86 °C /
-122.8
°F
up to -50 °C /
-58 °F
.
The freezers are available for several different voltages.
Lockable main switch (option)
An additional locking system with key for the freezer’s main power switch is optionally available.
Controller
The efficient chamber controller is equipped with a multitude of operating functions, in addition to recorder
and alarm functions. Set-point entry is easily accomplished directly via the chamber controller. Temperature
setting is accurate to a tenth of a degree. The controller is mounted at the optimal height for operation.
The controller offers an error diagnostics system generating audible and visual warning and alarm mes-
sages. The controller provides password protection for the setting menus.
The controller monitors ambient temperature and issues an alarm if it exceeds an adjustable value.
Housing
The inner chamber and the inside of the insulated outer door are made of stainless steel (German material
no. 1.4016, US equivalent AISI 430). The housing including all corners and edges is RAL 7035 varnished.
The inner surfaces are smooth and therefore easy to clean. Easy front access permits filter cleaning without
tools. Two 28 mm access port serve to introduce a sensor cable of a measuring device.
The buildup of ice in the door area is minimal due to perfect closing of the inner and outer doors. Precise
spatial distribution of the cold in the interior ensures storage of all samples at an identical storage temper-
ature. The prevention of thermal bridges protects against defrosting. The combination of vacuum insulation
panels (V technology) and CFC-free polyurethane foaming maximizes the cold storage capacity.
The freezer has two compartment doors. You can insert stainless steel shelves are make optimum use of
the interior. You can flexibly arrange the shelves to use the interior in a variable and optimum manner.
Inventory racks (stainless steel storage racks with cryo boxes, chap. 21) are optionally available.
Castors with locks serve to move the freezer.
Cooling system
The powerful, energy-efficient and low-noise refrigerating machine uses the environmentally friendly
“green” refrigerants R290 (propane) und R170 (ethane). They are completely free of HCFCs (hydrochloro-
fluorocarbons) and CFCs (chlorofluorocarbon).
Control of the two-stage refrigerating machine: The 1
st
stage cooling immediately turns on. In addition, the
2
nd
stage cooling turns on depending on the temperature.
Safety
Thanks to the standard overtemperature safety device, the set temperature is maintained also in case of a
controller failure.
In case of power failure at -80 °C / -112 °F, a temperature of -60 °C / -76 °F will not be exceeded in an
empty freezer for at least 3.5 hours, in a loaded freezer (measured with a 30 kg /
66 lb
water load) for
approx. 7 hours.
Data monitoring and recording
The chamber is regularly equipped with a zero-voltage relay alarm output (chap. 15.5) for integration into
customer systems.
The freezer is regularly equipped with an Ethernet interface (chap. 20.1) for computer communication,
enabling monitoring via a network.