When it comes to safety and reliability, refrigerators and freezers in the laboratory sector have to meet very stringent standards. In this overview, we are highlighting 10 features of Liebherr laboratory appliances that guarantee the safety and quality of the products stored in them.


Imagine you work in a medical or other research institute where you are dealing with highly sensitive samples and materials on a daily basis, some of which have to be stored in a refrigerated environment for months or even years. One morning, you arrive at work and notice that the refrigerator, in which your samples were stored, failed overnight… an absolutely mortifying prospect! You’ll have to start all over again with your research!

To prevent such devastating scenarios, Liebherr is constantly working to develop a whole manner of safety features for appliances designated for professional use in the medical and laboratory sector. These protect the highly sensitive samples and products that are stored, and sound the alarm if the temperature falls or rises to unacceptable levels. Here’s a list of our ten most important safety functions:

1. Safety Thermostat


At Liebherr, we only use highly reliable components. If, despite this, an unexpected fault occurs, an additional safety thermostat, on appliances with Comfort control, supports the electronic control system to prevent the temperature from falling below +2°C.

2. Integrated max/min memory

The maximum and minimum temperatures that occur within a specific time frame are continually documented. Once observed, the time frame can be reset and the temperature documentation process will begin again.

3. Potential-free contact

If there is no one on site, for example at night or over a weekend, the appliances can be connected to an existing external alarm system by means of a potential-free contact.

4. Serial RS 485 interface with documentation software 


External temperature and alarm documentation: the RS 485 interface can be used to network up to 20 appliances. These can then be connected to a PC or laptop using an, optionally available, interface converter with documentation software. In this way it is possible to document the temperature profile at regular intervals and to e-mail a specified user in the event of an alarm.

5. Temperature alarm


Optical and acoustic alarm if the temperature is too high or too low. The temperature alarm is triggered if the interior temperature goes beyond pre-defined limits.

6. Door open alarm


Alarm for if the door is accidentally left open: to prevent the temperature inside the appliances from rising, an optical and acoustic alarm indicates that the door has not been properly closed. Self‑closing doors provide additional security.

7. Power failure alarm


Protection against unnoticed power cuts: the power failure alarm alerts the user of power failure either immediately or when power is restored.

8. Alarm test function


This test function can be used to check whether an internally or externally connected alarm system is functioning correctly. The appliances’ refrigeration performance is not affected by the test.

9. Optional external temperature sensor


Laboratory appliances with Comfort electronic control systems can be connected to an independent temperature sensor via the back panel of the refrigerator compartment.

10. Self-closing door


To prevent unnecessary temperature increases in the appliance interior, and for greater convenience, the doors are self-closing.

Find out more about the Liebherr laboratory appliances in our web special.

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