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Working principle and characteristics of low-temperature constant temperature stirring reaction bath
Date: 2025-06-20Read: 3
Low temperature constant temperature stirring reaction bath is an experimental equipment that combines refrigeration, stirring, and precise temperature control, widely used in fields such as chemistry, biology, medicine, and materials science. The core principles and characteristics are as follows:
1、 Core working principle
1. Refrigeration system: The refrigerant is compressed into high-temperature and high-pressure gas by a compressor, liquefied by a condenser, and then depressurized and cooled by an expansion valve. It absorbs heat from the working medium (such as ethanol or silicone oil) in the evaporator to achieve a low-temperature environment. Refrigeration systems are typically equipped with multiple protective devices (such as overheat/overcurrent protection) to ensure safe operation.
2. Stirring system: A magnetic stirrer located at the bottom of the bath drives the stirring element to rotate, forcing the working medium to flow, eliminating temperature stratification, and ensuring temperature uniformity inside the bath. Some models support adjusting the stirring speed (such as 0-1400 rpm) to meet different experimental needs.
3. Temperature control system: The temperature sensor monitors the temperature of the medium in real time, and the control unit dynamically adjusts the cooling power or auxiliary heating module (if any) through PID algorithm to stabilize the temperature at the set value, with fluctuations as low as ± 0.1 ℃.
2、 Main technical features
1. Wide and precise temperature control range:
The low temperature can reach -100 ° C (with the assistance of liquid nitrogen/dry ice), up to 95 ° C, covering most low-temperature reaction scenarios.
Digital temperature display with a resolution of 0.1 ℃, combined with forced circulation and stirring, ensures good temperature uniformity.
2. Multi functional integrated design:
External circulation function: It can connect external devices (such as reaction vessels) and achieve remote temperature control through a circulation pump, expanding its application range.
Modular structure: The bath capacity is optional (such as 5L-30L), equipped with a retractable cover to reduce refrigerant consumption, and supports fixed burettes or sensors.
3. Safety and stability:
Fully enclosed magnetic stirring avoids the risk of mechanical seal leakage, and corrosion-resistant material baths are suitable for various reagents.
Integrate automatic protection mechanisms such as overheating and overcurrent to ensure long-term operation of the equipment.
3、 Typical application scenarios
1. Chemical reactions: low-temperature synthesis (such as organometallic reactions), polymerization reaction temperature control.
2. Biological experiments: temperature sensitive operations such as cell culture, PCR pre cooling, and nucleic acid extraction.
3. Physical property testing: viscosity measurement, material low-temperature performance analysis, etc.
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