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About Circulators and Baths
Refrigerated and heated laboratory circulators and baths are designed for controlling temperature. They are used for warming or cooling liquid samples to sustain or impede reactions. In addition to heating and cooling samples, some varieties are available with built-in shakers to agitate samples. Proper circulator and bath design includes a number of physical and mechanical features, and the electronic temperature controls. Conventional circulator and bath designs use separate heating and cooling devices immersed in the bath liquid, although other systemic styles are available. To maintain an even temperature, the bath fluid must be stirred vigorously. However this must be accomplished without the formation of air bubbles or vortices in the fluid, which could interrupt the temperature transmission, or negatively impact the samples. The temperature control system, including the temperature sensor or thermistor, must be responsive enough to maintain uniform temperatures for long periods.
The choice of fluid to be used within circulators and baths depends on a number of factors. The most important factors to consider include the recommendations of the bath manufacturer, whether the bath is designed for a specific fluid or group of fluids, the sensor being used to measure fluid temperature and its reliability, and the temperature range over which it will be tested. Oil and water are the most commonly used fluids in baths and circulators. However, a variety of high-dielectric fluids are available for temperatures below 32ºF and above 212ºF, where the use of water would not be feasible. The fluid should have the right viscosity for the operating temperature range to permit proper stirring action.
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Part Numbers for Circulators and Baths
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 441-0122 | Mectronic | Thermo Scientific Baths and Circulators | Not Provided | Thermo Scientific Baths and Circulators |
| 425-1821 | Mectronic | Thermo Scientific Baths and Circulators | Not Provided | Thermo Scientific Baths and Circulators |
| 611000000012 | Mectronic | Thermo Scientific Baths and Circulators | Not Provided | Thermo Scientific Baths and Circulators |
