As an important instrument and equipment in the laboratory, the magnetic stirring constant temperature water bath integrates constant temperature heating, magnetic stirring, and water bath heating functions, providing efficient and stable environmental support for experimental research in fields such as chemistry, biology, and physics. Its working principle and application characteristics deeply reflect the scientific and practical nature of modern laboratory instrument design.
Working principle of magnetic stirring constant temperature water bath
1. Principle of constant temperature control
The core of a magnetic stirring constant temperature water bath lies in its precise constant temperature control system. This system usually adopts a PID controller, which combines resistance wire heating with compression mechanism cooling to achieve precise adjustment of water bath temperature. Temperature sensors (such as Cu50 sensors) monitor the temperature of the water bath in real time and convert the temperature signal into an electrical signal to transmit to the controller. The controller dynamically adjusts the heating or cooling power based on the difference between the set temperature and the actual temperature, ensuring that the water bath temperature remains stable within the preset range. Some high-end devices are also equipped with digital display screens and temperature alarm systems, which can display temperature values in real time and issue alarms when the temperature exceeds the set range, further enhancing the safety of the experiment.
2. Principle of magnetic stirring
The magnetic stirring function is achieved by rotating the magnetic field. The rotating magnetic field outside the container drives the soft iron stirring rotor inside the container (sealed with plastic or glass) to rotate, thereby achieving the purpose of stirring the liquid. This non-contact stirring method avoids the pollution and wear that traditional mechanical stirring may cause, especially suitable for experiments that require high sample purity. Meanwhile, magnetic stirring can ensure uniform mixing of liquids, prevent solute and solvent from separating or precipitating, and improve the accuracy of experimental results.
Application characteristics of magnetic stirring constant temperature water bath
1. Improvement of experimental efficiency
The multifunctionality of the magnetic stirring constant temperature water bath significantly improves experimental efficiency. During the constant temperature heating process, magnetic stirring can ensure that the sample is uniformly heated, avoiding sample denaturation or uneven reaction caused by local overheating. For example, in an enzyme reaction system, uniform temperature distribution and stirring can maintain enzyme activity and promote the smooth progress of the reaction. In addition, the equipment is suitable for various experimental operations such as distillation, drying, and concentration, making it versatile and saving laboratory space and equipment costs.
2. Sample protection and safety
The equipment is equipped with an over temperature sound and light tracking alarm system, which can issue an alarm in a timely manner when the temperature is abnormal, preventing the sample from being damaged due to overheating. At the same time, the stainless steel liner and anti-corrosion design extend the service life of the equipment and reduce maintenance costs. During the operation, users only need to set the temperature and stirring speed, and the equipment can automatically run, reducing human intervention and improving the safety of the experiment.
Magnetic stirring constant temperature water bath has become an important instrument and equipment in laboratories due to its precise constant temperature control, efficient magnetic stirring, and wide range of application scenarios.