Laboratory Refrigerators and Freezers, Parts, Principle and Functions
#Laboratory_Refrigerators_and_Freezers_Parts_Principle_and_Functions
Laboratory Refrigerators and Freezers, Insulate cabinet fitted with cooling element with thermostat to maintain constant temperature, Require air circulation and fan to operate with high level accuracy, Fan shut off when door open to stop cold air, Usual temperature for storing samples in refrigerators (- 5ºC), Usual temperature for storing samples in freezers (-25ºC), Some lab refrigerators and freezers use as incubators by alternate between heating and cooling cycles, 4oC Laboratory Refrigerators, -20oC Laboratory Freezers, -80oC Laboratory Freezer, Refrigerators/Freezers Components, Compressor, power by motor for cooling by sent gas to condenser on warm portion of circuit, Condenser, change gas to liquid by substantial copper coils, Evaporator, keep contents chilled, Capillary Tube (Expansion Valve), tiny set of copper tubes, reduces temperature and pressure of liquid refrigerant, to facilitates cool conditions inside refrigerator and/or freezer, Refrigerant, change gas to liquid and back again to gas e.g. Freon or ammonia gas, Refrigerators/Freezers Accessories, Evaporator Fan Motor, distribute cold air across refrigerator or freezer, Condenser Fan Motor, drive air through condenser coils with compressor to cool, Thermistor, monitor internal temperature of refrigerator or freezer, Water Inlet Valve, responsible for generating enough water pressure and dispense water into ice tray to make ice, Water Filter, prevent water from reaching ice maker, Explosion-proof Refrigerator, Store flammable and dangerous chemicals, Lab Fridge, Keep temperatures stable, Preserve lab materials, Chromatography Refrigerator, Use for medical samples, Under-counter Freezer, Have forced air ventilation in extra clear space for general purposes, Upright Freezer, Vertical shape shelving unit, Promote temperature homogeneity, Ensure all samples exposed to same circumstances, Chest Freezer, Horizontal shape unit, Keep amount of samples in single unit, Blood Bank Freezer, Store chilled blood and blood products, Ultra-low Temperature Freezer, Store materials below (-40°C) and (-80°C), Has two independent evaporator circuits surrounding interior chamber, Refrigerators/ Freezers Precautions, Don’t keep human food consumption on its, Store only label chemicals and reagents materials in trays on shelves, Clean frequently, Refrigerators/Freezers Applications, Store samples, specimens, vaccines and medicines at specific temperature, Store solutions, serums, antibiotics and biochemical reagents, Store sterilized media by preventing dehydration at 4oC, Maintain microbial media, Prevent or stop biological contaminations, Keep moisture down for dried reagents that are susceptible to moisture contamination, Maintain reagent stability for chemical analysis
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