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Laboratory refrigerators or laboratory freezers have clear and important functions; This unit is used to cool or freeze samples for preservation. Typically, refrigerators are used to store samples at temperatures between -5 and 15 degrees Celsius, while freezers will usually store samples at temperatures between - 25 and - 15 degrees Celsius. Some laboratory freezers are used to store biological samples such as vaccines at much lower temperatures. Cryogenic freezing is also used in some laboratories, but requires special equipment that is capable of producing and tolerating very low temperatures. Ultra low temperature freezers (typically -50 degrees C and below) usually use a double compressor cascade type system to achieve this low temperature. The first compressor is used to get the temperature around -40 degrees C, after that the second compressor kicks in to reach the lower temperature needed. This lab freezer will usually be more noisy than the -20 degree C freezer, generate more heat into the room and will use more energy. They are also more expensive to repair than a standard laboratory fridge or freezer if the compressor needs to be replaced, because this will require a repair technician who specializes in these rather exotic compressors. Laboratory fridges and freezers include equipment for storing samples and special instrumentation used to conduct experiments that require precise temperature control. For example, laboratory refrigerators can be used to manage chromatography equipment in a refrigerator room. Refrigeration and freezing equipment is also used for storage of medical or pharmaceutical supplies. The blood bank uses a laboratory refrigerator to maintain the quality of its blood supply. Laboratory refrigerators and freezers that store blood and blood products must meet various regulatory and quality standards for obvious reasons. They usually come with an alarm system to warn laboratory employees about equipment failures. Plasma can be stored in a frozen freezer for a long time. Because the typical expiration date is one year from the date of collection, the problem of maintaining an adequate blood supply is greatly reduced. Pharmacies can also use laboratory refrigerators to store vaccines, medicines and other temperature sensitive compounds. Laboratory refrigerators and freezers include equipment for clotting blood plasma or other blood products for future use. Some laboratory freezers are used to store enzymes or other biological reagents that are used to carry out tests. Laboratory refrigerators and laboratory freezers may be stand-alone, upright units or may fit under a laboratory desk. Laboratory freezers can also be equipped with locks to limit entrances, and can even be designed to protect flammable materials from electrical spark. Some laboratory refrigerators and laboratory freezers are also used as incubators that rotate between the idexx indonesia heating period and the cooling period. This type of refrigerator is often used to cultivate and monitor bacterial growth. Combustible chemicals that require refrigeration should only be stored in laboratory refrigerators designed for the combustible storage of combustible materials. Flammable liquids are defined as having a flash point of less than 100 degrees F (38 degrees C). UL approved flammable storage laboratory refrigerators for the storage of flammable chemicals; Laboratory freezers are also often used for this purpose. Combustible refrigerators do not have electric sparking devices, relays, switches or thermostats that can ignite flammable vapor in the cabinet. They can also incorporate design features such as doorways, self-closing doors, magnetic door gaskets and special leather materials that control or limit damage if a reaction occurs in the storage compartment. The label that states 'Refrigerators of Flammable Material: Keep away from fire' must identify the refrigerator. Combustible storage units cannot be placed in rooms containing explosive vapor, but chemicals that emit explosive vapor can be stored safely inside. They are called laboratory-safe, fire-safe or explosion refrigerators. These refrigerators are more expensive than standard household or even laboratory refrigerators for that matter, but they must be used if combustible will be stored in the refrigerator.