Definition
The thermostatic laboratory shaker is a laboratory equipment that integrates temperature control and oscillation functions. It is able to maintain a uniform and stable temperature environment within a set temperature range, while mechanically driving the carrying sample container to periodically oscillate, thereby providing the sample with controllable temperature and dynamic mixing conditions.
How it works:
The constant temperature experimental shaker is mainly composed of temperature control system, oscillation drive system and box structure. The temperature control system usually uses a combination of electric heating elements and compressor cooling, with high-precision temperature sensors and PID controllers, to achieve precise adjustment and stable maintenance of the temperature of the air or water bath medium in the box. The oscillating drive system drives the eccentric wheel or crank linkage mechanism through a motor, which converts the rotational motion into a horizontal, swivel or rocker-type reciprocating motion of the platform, and its oscillation frequency can be adjusted by means of a governor. The interior of the chamber is designed with forced convection air ducts or water circulation paths to ensure temperature uniformity.
Measurement method
The performance evaluation of thermostatic experimental shakers is usually carried out according to relevant national or international standards. Temperature performance measurement requires calibrated temperature probes to be placed at multiple representative positions in the chamber, and the temperature at each point is recorded after the set temperature point is stabilized, and the temperature uniformity and fluctuation are calculated. Oscillation frequency measurement uses a non-contact tachometer to measure the cycle of motion of a drive shaft or platform reference point. Amplitude measurement can be done by placing a ruler at the platform marking point, combining it with a high-speed camera or displacement sensor to record the limit position difference of the platform. Measurements should be carried out under no-load and typical load conditions, and ambient temperature and humidity conditions should be recorded.
Influencing factors
The operation effect of the constant temperature experimental shaker is affected by a variety of factors. Environmental conditions such as laboratory ambient temperature and ventilation can affect the heat dissipation and temperature stability of the equipment. The loading characteristics include the material, quantity, distribution mode, sample volume and physical properties of the sample container, which may change the thermal balance and oscillation damping in the container. Parameter drift can be caused by factors such as platform fixation, drive wear and tear, degradation of heating and cooling elements, and sensor calibration status. The combination of user operation settings, such as temperature setpoints, oscillation frequency, and amplitude, also needs to match the experimental requirements.
Applications:
Constant temperature experimental shakers are widely used in scientific research and testing links that require dynamic incubation mixing. In life science research, it is used for thermostatic oscillation culture in cell culture, protein expression, nucleic acid hybridization and other processes. In the food industry, it is suitable for the preparation and culture of microbiological detection samples, the extraction and reaction of food ingredients. In terms of environmental monitoring, it can be used for pretreatment and constant temperature oscillation extraction of water or soil samples. In the field of chemicals and materials, it is often used for catalytic reactions, synthesis experiments, or homogenization of coatings and resins. At its core, it provides a controlled and dynamic warming environment for all kinds of physical, chemical or biological processes.
Selection considerations
When choosing a constant temperature experimental shaker, it is necessary to conduct a systematic evaluation based on the experimental requirements. Temperature range and accuracy are the primary parameters to ensure that the equipment covers the required temperature points for the experiment and maintains sufficient stability. The oscillation mode (such as horizontal reciprocating, rotation, rocker) and the frequency and amplitude range should match the sample mixing and mass transfer requirements. The volume of the box and the size of the platform should be adapted to the number and specifications of commonly used sample containers. The control interface should be clear and easy to use, with temperature, time, oscillation parameter setting and storage functions, and safety functions such as overheating protection and fault alarm. In addition, operational noise, energy consumption, ease of maintenance, and the supplier's technical support and service capabilities should also be taken into account.