Water baths are widely used in academic institution, clinical laboratories, government research laboratories, in food technology, environmental applications and wastewater plants. Using water baths is one of the best means of incubation because water retains heat so well. Applications of laboratory water baths include bacteriological examinations, sample thawing, coliform determinations, warming reagents, microbiological assays and many more. Different types of
water baths are available depending on their application. It is very essential to choose the right water bath for the right purpose. The various factors that are to be considered while purchasing water baths are as follows:
Electronics
First and foremost factor to consider is the electronics when purchasing a water bath. Digital control systems are very popular as they provide greater temperature uniformity, control and stability. Constant temperature digital water baths are ideal to varied applications, including bacteriological examinations, food processing, microbiology assays etc. There are analog systems available in these water baths which offer easy-to-use control and are ideal to fixed set-point applications.
Water Bath
Set Temperature
Most general laboratory water baths are available in the temperature range of + 5 degree C to 99.9 degree C, with temperature uniformity at ± 0.2 degree C at 37 degree C. Many manufacturers offer temperature preset buttons for quick selection of the most commonly used temperature set points.
Uniformity of Temperature
Lab water baths with non-contact recessed heating elements are usually better than baths with heating elements mounted directly to the tank. This design of recessed heating element specifically reduces element burnout and eliminate tank hot spots.
Size of the Water Bath
Choosing the right size water bath depends the size of samples as well as volume. Water bath sizes can range from 1.5 to 43 liters. It is better to compare internal tank dimensions to compare different bath volumes .
Lid or no Lid
If there is the problem of outside contaminants, it is necessary to buy a water bath cover, that too clear covers, in which the users can see inside. Attached lids eliminate condensation problems. Gabled covers accommodate glassware of different heights and helps in easy loading and removal of samples. Some vendors supply hinged covers water baths that stay open 90 degrees or remove completely. Others offer lid fins that protect hands from hot vapors. Lids in water baths are also needed if the laboratory is operating the water bath above 60ºC, in order to maintain temperature.
Long lasting
Rounded, seamless stainless steel bath construction helps in preventing rust, chemical damage and contamination. Powder coating like epoxy coating on the outside helps in easy cleanup. The exterior also needs to remain cool so as to prevent accidental burns after extended use.
Safety
Lastly, safety features should be considered. It is very essential to handle the water bath with great care. Safety features in water baths include secondary thermostats that automatically disconnect heater power if the temperature becomes too high or the liquid level drop too low. There can be alarm indicators in case of any dangers.
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