Liebherr WTes 5872 Vinidor - Manual (Page 12)

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+0.5°C
Cal. 5.0°C +0.5°C
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Low temperature -45 °C chest freezers
Low temperature -45 °C
chest freezers
T he low temperature -45 °C chest freezers are designed to meet
the specifi c requirements of an array of research, industrial or
clinical applications. Where there is a need to store products or
samples at lower than usual freezing temperatures freezers are the
ideal solution. Offering supreme temperature stability as well as
temperature uniformity within the units, they ensure the safe, cold
storage of specimens, biological samples and other substances.
The low temperature chest freezers are available in three sizes and
are equipped with a precision digital controller, which guarantees
maximum temperature accuracy. Having a volt-free contact and an
RS 485 serial interface, Liebherr’s low temperature chest freezers can
also be connected to a central alarm and documentation system,
which provides additional safety for the samples within the unit.
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The Comfort electronic controller
The precision Comfort electronic controller with digital temperature display enables temperatures to be
set accurately. Symbols indicate the operating status of the appliance at all times. To satisfy laboratory
hygiene requirements, the Comfort electronic controller has an easy-clean membrane keypad.
External temperature and alarm connections
The low temperature chest freezers with Comfort electronic controllers are equipped with a volt-free
contact for alarm forwarding to an external remote warning system. In addition, the appliances have
an RS 485 serial interface for central documentation of the temperature profi le data and alarm events.
Integrated alarm systems
A visual and audible temperature alarm alerts the user if temperature deviation limits are exceeded. The
parameters for the temperature alarm can be individually set. In addition, a visual and audible alarm
is activated when the lid is open for longer than 1 minute. The door-open alarm delay can be adjusted
between 1 and 5 minutes. Furthermore, the laboratory appliances with Comfort electronic controllers
have a visual power failure alarm when mains power returns and a sensor defect alarm.
Integrated data memory with min/max temperatures
The Comfort electronic controller has an integrated data memory. It logs the maximum and minimum
internal temperatures that occurred once the set temperature was reached, the last three temperature
alarms and power failures, together with the time, date and duration of the alarm. The respective data
can be recalled using the AlarmLog function and read on the display panel.
1-point calibration
The low temperature chest freezers with Comfort electronic controllers provide 1-point calibration for
accurate temperature control. This permits compensation between the set temperature and the actual
internal temperature. Positive or negative changes to the correction value can be made in steps of 0.1K.
StopFrost-System
The Stop-Frost system fi tted to the LGT models has 2 major advantages: frosting of the freezer and its
contents is signifi cantly reduced. This means the time-consuming process of defrosting is necessary far
less often. The vacuum is also equalised quickly after the lid has been opened and closed and the chest
freezer can be re-opened effortlessly.
Lid handle
The aluminium lid handle of the LGT models is simple and tough for intensive commercial use. All
models have locks as standard.
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