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UF V (E3) 10/2020 Page 18/119
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.
Battery-buffered alarm system (option)
The freezer is optionally equipped with a rechargeable battery (12 V, 7.2 Ah). Battery voltage is regularly
monitored. An alarm indicates too low battery voltage. You can check the battery voltage in the controller
menu.
The advanced voltage booster optionally available provides automatic voltage compensation through a
buck/boost converter (chap. 4.6).
An error diagnostics system monitors the chamber functions and generates audible and visual warning and
alarm messages. The door is monitored for being closed.
The CO
2
emergency cooling (option, chap. 21) offers additional refrigeration, i.e., following introduction of
a heat load, in case of a power failure or failure of the cooling system.
Data monitoring and recording
The chamber is regularly equipped with a zero-voltage relay alarm output (chap. 14.4.7) and optionally with
an analog output (chap. 22.3) for integration into customer systems.
The freezer is regularly equipped with an Ethernet interface (chap. 22.1) for computer communication,
enabling monitoring via a network. The BINDER APT-COM™ 4 Multi Management Software (option, chap.
22.2) permits networking of up to 40 chambers and connection to a computer, as well as recording and
representing temperature data.
A data logger independent from the chamber controller (option, chap. 22.4) serves to independently record
the temperature values, data given out in compliance with FDA guideline 21 CFR part 11.
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